1 /* Fold a constant sub-tree into a single node for C-compiler
2 Copyright (C) 1987-2020 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /*@@ This file should be rewritten to use an arbitrary precision
21 @@ representation for "struct tree_int_cst" and "struct tree_real_cst".
22 @@ Perhaps the routines could also be used for bc/dc, and made a lib.
23 @@ The routines that translate from the ap rep should
24 @@ warn if precision et. al. is lost.
25 @@ This would also make life easier when this technology is used
26 @@ for cross-compilers. */
28 /* The entry points in this file are fold, size_int_wide and size_binop.
30 fold takes a tree as argument and returns a simplified tree.
32 size_binop takes a tree code for an arithmetic operation
33 and two operands that are trees, and produces a tree for the
34 result, assuming the type comes from `sizetype'.
36 size_int takes an integer value, and creates a tree constant
37 with type from `sizetype'.
39 Note: Since the folders get called on non-gimple code as well as
40 gimple code, we need to handle GIMPLE tuples as well as their
41 corresponding tree equivalents. */
45 #include "coretypes.h"
54 #include "tree-ssa-operands.h"
55 #include "optabs-query.h"
57 #include "diagnostic-core.h"
60 #include "fold-const.h"
61 #include "fold-const-call.h"
62 #include "stor-layout.h"
64 #include "tree-iterator.h"
67 #include "langhooks.h"
72 #include "generic-match.h"
73 #include "gimple-fold.h"
74 #include "tree-into-ssa.h"
76 #include "case-cfn-macros.h"
77 #include "stringpool.h"
79 #include "tree-ssanames.h"
81 #include "stringpool.h"
83 #include "tree-vector-builder.h"
84 #include "vec-perm-indices.h"
86 /* Nonzero if we are folding constants inside an initializer; zero
88 int folding_initializer
= 0;
90 /* The following constants represent a bit based encoding of GCC's
91 comparison operators. This encoding simplifies transformations
92 on relational comparison operators, such as AND and OR. */
93 enum comparison_code
{
112 static bool negate_expr_p (tree
);
113 static tree
negate_expr (tree
);
114 static tree
associate_trees (location_t
, tree
, tree
, enum tree_code
, tree
);
115 static enum comparison_code
comparison_to_compcode (enum tree_code
);
116 static enum tree_code
compcode_to_comparison (enum comparison_code
);
117 static bool twoval_comparison_p (tree
, tree
*, tree
*);
118 static tree
eval_subst (location_t
, tree
, tree
, tree
, tree
, tree
);
119 static tree
optimize_bit_field_compare (location_t
, enum tree_code
,
121 static bool simple_operand_p (const_tree
);
122 static bool simple_operand_p_2 (tree
);
123 static tree
range_binop (enum tree_code
, tree
, tree
, int, tree
, int);
124 static tree
range_predecessor (tree
);
125 static tree
range_successor (tree
);
126 static tree
fold_range_test (location_t
, enum tree_code
, tree
, tree
, tree
);
127 static tree
fold_cond_expr_with_comparison (location_t
, tree
, tree
, tree
, tree
);
128 static tree
unextend (tree
, int, int, tree
);
129 static tree
extract_muldiv (tree
, tree
, enum tree_code
, tree
, bool *);
130 static tree
extract_muldiv_1 (tree
, tree
, enum tree_code
, tree
, bool *);
131 static tree
fold_binary_op_with_conditional_arg (location_t
,
132 enum tree_code
, tree
,
135 static tree
fold_negate_const (tree
, tree
);
136 static tree
fold_not_const (const_tree
, tree
);
137 static tree
fold_relational_const (enum tree_code
, tree
, tree
, tree
);
138 static tree
fold_convert_const (enum tree_code
, tree
, tree
);
139 static tree
fold_view_convert_expr (tree
, tree
);
140 static tree
fold_negate_expr (location_t
, tree
);
143 /* Return EXPR_LOCATION of T if it is not UNKNOWN_LOCATION.
144 Otherwise, return LOC. */
147 expr_location_or (tree t
, location_t loc
)
149 location_t tloc
= EXPR_LOCATION (t
);
150 return tloc
== UNKNOWN_LOCATION
? loc
: tloc
;
153 /* Similar to protected_set_expr_location, but never modify x in place,
154 if location can and needs to be set, unshare it. */
157 protected_set_expr_location_unshare (tree x
, location_t loc
)
159 if (CAN_HAVE_LOCATION_P (x
)
160 && EXPR_LOCATION (x
) != loc
161 && !(TREE_CODE (x
) == SAVE_EXPR
162 || TREE_CODE (x
) == TARGET_EXPR
163 || TREE_CODE (x
) == BIND_EXPR
))
166 SET_EXPR_LOCATION (x
, loc
);
171 /* If ARG2 divides ARG1 with zero remainder, carries out the exact
172 division and returns the quotient. Otherwise returns
176 div_if_zero_remainder (const_tree arg1
, const_tree arg2
)
180 if (wi::multiple_of_p (wi::to_widest (arg1
), wi::to_widest (arg2
),
182 return wide_int_to_tree (TREE_TYPE (arg1
), quo
);
187 /* This is nonzero if we should defer warnings about undefined
188 overflow. This facility exists because these warnings are a
189 special case. The code to estimate loop iterations does not want
190 to issue any warnings, since it works with expressions which do not
191 occur in user code. Various bits of cleanup code call fold(), but
192 only use the result if it has certain characteristics (e.g., is a
193 constant); that code only wants to issue a warning if the result is
196 static int fold_deferring_overflow_warnings
;
198 /* If a warning about undefined overflow is deferred, this is the
199 warning. Note that this may cause us to turn two warnings into
200 one, but that is fine since it is sufficient to only give one
201 warning per expression. */
203 static const char* fold_deferred_overflow_warning
;
205 /* If a warning about undefined overflow is deferred, this is the
206 level at which the warning should be emitted. */
208 static enum warn_strict_overflow_code fold_deferred_overflow_code
;
210 /* Start deferring overflow warnings. We could use a stack here to
211 permit nested calls, but at present it is not necessary. */
214 fold_defer_overflow_warnings (void)
216 ++fold_deferring_overflow_warnings
;
219 /* Stop deferring overflow warnings. If there is a pending warning,
220 and ISSUE is true, then issue the warning if appropriate. STMT is
221 the statement with which the warning should be associated (used for
222 location information); STMT may be NULL. CODE is the level of the
223 warning--a warn_strict_overflow_code value. This function will use
224 the smaller of CODE and the deferred code when deciding whether to
225 issue the warning. CODE may be zero to mean to always use the
229 fold_undefer_overflow_warnings (bool issue
, const gimple
*stmt
, int code
)
234 gcc_assert (fold_deferring_overflow_warnings
> 0);
235 --fold_deferring_overflow_warnings
;
236 if (fold_deferring_overflow_warnings
> 0)
238 if (fold_deferred_overflow_warning
!= NULL
240 && code
< (int) fold_deferred_overflow_code
)
241 fold_deferred_overflow_code
= (enum warn_strict_overflow_code
) code
;
245 warnmsg
= fold_deferred_overflow_warning
;
246 fold_deferred_overflow_warning
= NULL
;
248 if (!issue
|| warnmsg
== NULL
)
251 if (gimple_no_warning_p (stmt
))
254 /* Use the smallest code level when deciding to issue the
256 if (code
== 0 || code
> (int) fold_deferred_overflow_code
)
257 code
= fold_deferred_overflow_code
;
259 if (!issue_strict_overflow_warning (code
))
263 locus
= input_location
;
265 locus
= gimple_location (stmt
);
266 warning_at (locus
, OPT_Wstrict_overflow
, "%s", warnmsg
);
269 /* Stop deferring overflow warnings, ignoring any deferred
273 fold_undefer_and_ignore_overflow_warnings (void)
275 fold_undefer_overflow_warnings (false, NULL
, 0);
278 /* Whether we are deferring overflow warnings. */
281 fold_deferring_overflow_warnings_p (void)
283 return fold_deferring_overflow_warnings
> 0;
286 /* This is called when we fold something based on the fact that signed
287 overflow is undefined. */
290 fold_overflow_warning (const char* gmsgid
, enum warn_strict_overflow_code wc
)
292 if (fold_deferring_overflow_warnings
> 0)
294 if (fold_deferred_overflow_warning
== NULL
295 || wc
< fold_deferred_overflow_code
)
297 fold_deferred_overflow_warning
= gmsgid
;
298 fold_deferred_overflow_code
= wc
;
301 else if (issue_strict_overflow_warning (wc
))
302 warning (OPT_Wstrict_overflow
, gmsgid
);
305 /* Return true if the built-in mathematical function specified by CODE
306 is odd, i.e. -f(x) == f(-x). */
309 negate_mathfn_p (combined_fn fn
)
332 CASE_CFN_ROUNDEVEN_FN
:
344 return !flag_rounding_math
;
352 /* Check whether we may negate an integer constant T without causing
356 may_negate_without_overflow_p (const_tree t
)
360 gcc_assert (TREE_CODE (t
) == INTEGER_CST
);
362 type
= TREE_TYPE (t
);
363 if (TYPE_UNSIGNED (type
))
366 return !wi::only_sign_bit_p (wi::to_wide (t
));
369 /* Determine whether an expression T can be cheaply negated using
370 the function negate_expr without introducing undefined overflow. */
373 negate_expr_p (tree t
)
380 type
= TREE_TYPE (t
);
383 switch (TREE_CODE (t
))
386 if (INTEGRAL_TYPE_P (type
) && TYPE_UNSIGNED (type
))
389 /* Check that -CST will not overflow type. */
390 return may_negate_without_overflow_p (t
);
392 return (INTEGRAL_TYPE_P (type
)
393 && TYPE_OVERFLOW_WRAPS (type
));
399 return !TYPE_OVERFLOW_SANITIZED (type
);
402 /* We want to canonicalize to positive real constants. Pretend
403 that only negative ones can be easily negated. */
404 return REAL_VALUE_NEGATIVE (TREE_REAL_CST (t
));
407 return negate_expr_p (TREE_REALPART (t
))
408 && negate_expr_p (TREE_IMAGPART (t
));
412 if (FLOAT_TYPE_P (TREE_TYPE (type
)) || TYPE_OVERFLOW_WRAPS (type
))
415 /* Steps don't prevent negation. */
416 unsigned int count
= vector_cst_encoded_nelts (t
);
417 for (unsigned int i
= 0; i
< count
; ++i
)
418 if (!negate_expr_p (VECTOR_CST_ENCODED_ELT (t
, i
)))
425 return negate_expr_p (TREE_OPERAND (t
, 0))
426 && negate_expr_p (TREE_OPERAND (t
, 1));
429 return negate_expr_p (TREE_OPERAND (t
, 0));
432 if (HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
433 || HONOR_SIGNED_ZEROS (element_mode (type
))
434 || (ANY_INTEGRAL_TYPE_P (type
)
435 && ! TYPE_OVERFLOW_WRAPS (type
)))
437 /* -(A + B) -> (-B) - A. */
438 if (negate_expr_p (TREE_OPERAND (t
, 1)))
440 /* -(A + B) -> (-A) - B. */
441 return negate_expr_p (TREE_OPERAND (t
, 0));
444 /* We can't turn -(A-B) into B-A when we honor signed zeros. */
445 return !HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
446 && !HONOR_SIGNED_ZEROS (element_mode (type
))
447 && (! ANY_INTEGRAL_TYPE_P (type
)
448 || TYPE_OVERFLOW_WRAPS (type
));
451 if (TYPE_UNSIGNED (type
))
453 /* INT_MIN/n * n doesn't overflow while negating one operand it does
454 if n is a (negative) power of two. */
455 if (INTEGRAL_TYPE_P (TREE_TYPE (t
))
456 && ! TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
457 && ! ((TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
459 (wi::abs (wi::to_wide (TREE_OPERAND (t
, 0))))) != 1)
460 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
462 (wi::abs (wi::to_wide (TREE_OPERAND (t
, 1))))) != 1)))
468 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (TREE_TYPE (t
))))
469 return negate_expr_p (TREE_OPERAND (t
, 1))
470 || negate_expr_p (TREE_OPERAND (t
, 0));
476 if (TYPE_UNSIGNED (type
))
478 /* In general we can't negate A in A / B, because if A is INT_MIN and
479 B is not 1 we change the sign of the result. */
480 if (TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
481 && negate_expr_p (TREE_OPERAND (t
, 0)))
483 /* In general we can't negate B in A / B, because if A is INT_MIN and
484 B is 1, we may turn this into INT_MIN / -1 which is undefined
485 and actually traps on some architectures. */
486 if (! ANY_INTEGRAL_TYPE_P (TREE_TYPE (t
))
487 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
488 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
489 && ! integer_onep (TREE_OPERAND (t
, 1))))
490 return negate_expr_p (TREE_OPERAND (t
, 1));
494 /* Negate -((double)float) as (double)(-float). */
495 if (TREE_CODE (type
) == REAL_TYPE
)
497 tree tem
= strip_float_extensions (t
);
499 return negate_expr_p (tem
);
504 /* Negate -f(x) as f(-x). */
505 if (negate_mathfn_p (get_call_combined_fn (t
)))
506 return negate_expr_p (CALL_EXPR_ARG (t
, 0));
510 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
511 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
513 tree op1
= TREE_OPERAND (t
, 1);
514 if (wi::to_wide (op1
) == TYPE_PRECISION (type
) - 1)
525 /* Given T, an expression, return a folded tree for -T or NULL_TREE, if no
526 simplification is possible.
527 If negate_expr_p would return true for T, NULL_TREE will never be
531 fold_negate_expr_1 (location_t loc
, tree t
)
533 tree type
= TREE_TYPE (t
);
536 switch (TREE_CODE (t
))
538 /* Convert - (~A) to A + 1. */
540 if (INTEGRAL_TYPE_P (type
))
541 return fold_build2_loc (loc
, PLUS_EXPR
, type
, TREE_OPERAND (t
, 0),
542 build_one_cst (type
));
546 tem
= fold_negate_const (t
, type
);
547 if (TREE_OVERFLOW (tem
) == TREE_OVERFLOW (t
)
548 || (ANY_INTEGRAL_TYPE_P (type
)
549 && !TYPE_OVERFLOW_TRAPS (type
)
550 && TYPE_OVERFLOW_WRAPS (type
))
551 || (flag_sanitize
& SANITIZE_SI_OVERFLOW
) == 0)
558 tem
= fold_negate_const (t
, type
);
563 tree rpart
= fold_negate_expr (loc
, TREE_REALPART (t
));
564 tree ipart
= fold_negate_expr (loc
, TREE_IMAGPART (t
));
566 return build_complex (type
, rpart
, ipart
);
572 tree_vector_builder elts
;
573 elts
.new_unary_operation (type
, t
, true);
574 unsigned int count
= elts
.encoded_nelts ();
575 for (unsigned int i
= 0; i
< count
; ++i
)
577 tree elt
= fold_negate_expr (loc
, VECTOR_CST_ELT (t
, i
));
578 if (elt
== NULL_TREE
)
580 elts
.quick_push (elt
);
583 return elts
.build ();
587 if (negate_expr_p (t
))
588 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
589 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)),
590 fold_negate_expr (loc
, TREE_OPERAND (t
, 1)));
594 if (negate_expr_p (t
))
595 return fold_build1_loc (loc
, CONJ_EXPR
, type
,
596 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)));
600 if (!TYPE_OVERFLOW_SANITIZED (type
))
601 return TREE_OPERAND (t
, 0);
605 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
606 && !HONOR_SIGNED_ZEROS (element_mode (type
)))
608 /* -(A + B) -> (-B) - A. */
609 if (negate_expr_p (TREE_OPERAND (t
, 1)))
611 tem
= negate_expr (TREE_OPERAND (t
, 1));
612 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
613 tem
, TREE_OPERAND (t
, 0));
616 /* -(A + B) -> (-A) - B. */
617 if (negate_expr_p (TREE_OPERAND (t
, 0)))
619 tem
= negate_expr (TREE_OPERAND (t
, 0));
620 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
621 tem
, TREE_OPERAND (t
, 1));
627 /* - (A - B) -> B - A */
628 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
629 && !HONOR_SIGNED_ZEROS (element_mode (type
)))
630 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
631 TREE_OPERAND (t
, 1), TREE_OPERAND (t
, 0));
635 if (TYPE_UNSIGNED (type
))
641 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
)))
643 tem
= TREE_OPERAND (t
, 1);
644 if (negate_expr_p (tem
))
645 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
646 TREE_OPERAND (t
, 0), negate_expr (tem
));
647 tem
= TREE_OPERAND (t
, 0);
648 if (negate_expr_p (tem
))
649 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
650 negate_expr (tem
), TREE_OPERAND (t
, 1));
657 if (TYPE_UNSIGNED (type
))
659 /* In general we can't negate A in A / B, because if A is INT_MIN and
660 B is not 1 we change the sign of the result. */
661 if (TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
662 && negate_expr_p (TREE_OPERAND (t
, 0)))
663 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
664 negate_expr (TREE_OPERAND (t
, 0)),
665 TREE_OPERAND (t
, 1));
666 /* In general we can't negate B in A / B, because if A is INT_MIN and
667 B is 1, we may turn this into INT_MIN / -1 which is undefined
668 and actually traps on some architectures. */
669 if ((! ANY_INTEGRAL_TYPE_P (TREE_TYPE (t
))
670 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
671 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
672 && ! integer_onep (TREE_OPERAND (t
, 1))))
673 && negate_expr_p (TREE_OPERAND (t
, 1)))
674 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
676 negate_expr (TREE_OPERAND (t
, 1)));
680 /* Convert -((double)float) into (double)(-float). */
681 if (TREE_CODE (type
) == REAL_TYPE
)
683 tem
= strip_float_extensions (t
);
684 if (tem
!= t
&& negate_expr_p (tem
))
685 return fold_convert_loc (loc
, type
, negate_expr (tem
));
690 /* Negate -f(x) as f(-x). */
691 if (negate_mathfn_p (get_call_combined_fn (t
))
692 && negate_expr_p (CALL_EXPR_ARG (t
, 0)))
696 fndecl
= get_callee_fndecl (t
);
697 arg
= negate_expr (CALL_EXPR_ARG (t
, 0));
698 return build_call_expr_loc (loc
, fndecl
, 1, arg
);
703 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
704 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
706 tree op1
= TREE_OPERAND (t
, 1);
707 if (wi::to_wide (op1
) == TYPE_PRECISION (type
) - 1)
709 tree ntype
= TYPE_UNSIGNED (type
)
710 ? signed_type_for (type
)
711 : unsigned_type_for (type
);
712 tree temp
= fold_convert_loc (loc
, ntype
, TREE_OPERAND (t
, 0));
713 temp
= fold_build2_loc (loc
, RSHIFT_EXPR
, ntype
, temp
, op1
);
714 return fold_convert_loc (loc
, type
, temp
);
726 /* A wrapper for fold_negate_expr_1. */
729 fold_negate_expr (location_t loc
, tree t
)
731 tree type
= TREE_TYPE (t
);
733 tree tem
= fold_negate_expr_1 (loc
, t
);
734 if (tem
== NULL_TREE
)
736 return fold_convert_loc (loc
, type
, tem
);
739 /* Like fold_negate_expr, but return a NEGATE_EXPR tree, if T cannot be
740 negated in a simpler way. Also allow for T to be NULL_TREE, in which case
752 loc
= EXPR_LOCATION (t
);
753 type
= TREE_TYPE (t
);
756 tem
= fold_negate_expr (loc
, t
);
758 tem
= build1_loc (loc
, NEGATE_EXPR
, TREE_TYPE (t
), t
);
759 return fold_convert_loc (loc
, type
, tem
);
762 /* Split a tree IN into a constant, literal and variable parts that could be
763 combined with CODE to make IN. "constant" means an expression with
764 TREE_CONSTANT but that isn't an actual constant. CODE must be a
765 commutative arithmetic operation. Store the constant part into *CONP,
766 the literal in *LITP and return the variable part. If a part isn't
767 present, set it to null. If the tree does not decompose in this way,
768 return the entire tree as the variable part and the other parts as null.
770 If CODE is PLUS_EXPR we also split trees that use MINUS_EXPR. In that
771 case, we negate an operand that was subtracted. Except if it is a
772 literal for which we use *MINUS_LITP instead.
774 If NEGATE_P is true, we are negating all of IN, again except a literal
775 for which we use *MINUS_LITP instead. If a variable part is of pointer
776 type, it is negated after converting to TYPE. This prevents us from
777 generating illegal MINUS pointer expression. LOC is the location of
778 the converted variable part.
780 If IN is itself a literal or constant, return it as appropriate.
782 Note that we do not guarantee that any of the three values will be the
783 same type as IN, but they will have the same signedness and mode. */
786 split_tree (tree in
, tree type
, enum tree_code code
,
787 tree
*minus_varp
, tree
*conp
, tree
*minus_conp
,
788 tree
*litp
, tree
*minus_litp
, int negate_p
)
797 /* Strip any conversions that don't change the machine mode or signedness. */
798 STRIP_SIGN_NOPS (in
);
800 if (TREE_CODE (in
) == INTEGER_CST
|| TREE_CODE (in
) == REAL_CST
801 || TREE_CODE (in
) == FIXED_CST
)
803 else if (TREE_CODE (in
) == code
804 || ((! FLOAT_TYPE_P (TREE_TYPE (in
)) || flag_associative_math
)
805 && ! SAT_FIXED_POINT_TYPE_P (TREE_TYPE (in
))
806 /* We can associate addition and subtraction together (even
807 though the C standard doesn't say so) for integers because
808 the value is not affected. For reals, the value might be
809 affected, so we can't. */
810 && ((code
== PLUS_EXPR
&& TREE_CODE (in
) == POINTER_PLUS_EXPR
)
811 || (code
== PLUS_EXPR
&& TREE_CODE (in
) == MINUS_EXPR
)
812 || (code
== MINUS_EXPR
813 && (TREE_CODE (in
) == PLUS_EXPR
814 || TREE_CODE (in
) == POINTER_PLUS_EXPR
)))))
816 tree op0
= TREE_OPERAND (in
, 0);
817 tree op1
= TREE_OPERAND (in
, 1);
818 int neg1_p
= TREE_CODE (in
) == MINUS_EXPR
;
819 int neg_litp_p
= 0, neg_conp_p
= 0, neg_var_p
= 0;
821 /* First see if either of the operands is a literal, then a constant. */
822 if (TREE_CODE (op0
) == INTEGER_CST
|| TREE_CODE (op0
) == REAL_CST
823 || TREE_CODE (op0
) == FIXED_CST
)
824 *litp
= op0
, op0
= 0;
825 else if (TREE_CODE (op1
) == INTEGER_CST
|| TREE_CODE (op1
) == REAL_CST
826 || TREE_CODE (op1
) == FIXED_CST
)
827 *litp
= op1
, neg_litp_p
= neg1_p
, op1
= 0;
829 if (op0
!= 0 && TREE_CONSTANT (op0
))
830 *conp
= op0
, op0
= 0;
831 else if (op1
!= 0 && TREE_CONSTANT (op1
))
832 *conp
= op1
, neg_conp_p
= neg1_p
, op1
= 0;
834 /* If we haven't dealt with either operand, this is not a case we can
835 decompose. Otherwise, VAR is either of the ones remaining, if any. */
836 if (op0
!= 0 && op1
!= 0)
841 var
= op1
, neg_var_p
= neg1_p
;
843 /* Now do any needed negations. */
845 *minus_litp
= *litp
, *litp
= 0;
846 if (neg_conp_p
&& *conp
)
847 *minus_conp
= *conp
, *conp
= 0;
848 if (neg_var_p
&& var
)
849 *minus_varp
= var
, var
= 0;
851 else if (TREE_CONSTANT (in
))
853 else if (TREE_CODE (in
) == BIT_NOT_EXPR
854 && code
== PLUS_EXPR
)
856 /* -1 - X is folded to ~X, undo that here. Do _not_ do this
857 when IN is constant. */
858 *litp
= build_minus_one_cst (type
);
859 *minus_varp
= TREE_OPERAND (in
, 0);
867 *minus_litp
= *litp
, *litp
= 0;
868 else if (*minus_litp
)
869 *litp
= *minus_litp
, *minus_litp
= 0;
871 *minus_conp
= *conp
, *conp
= 0;
872 else if (*minus_conp
)
873 *conp
= *minus_conp
, *minus_conp
= 0;
875 *minus_varp
= var
, var
= 0;
876 else if (*minus_varp
)
877 var
= *minus_varp
, *minus_varp
= 0;
881 && TREE_OVERFLOW_P (*litp
))
882 *litp
= drop_tree_overflow (*litp
);
884 && TREE_OVERFLOW_P (*minus_litp
))
885 *minus_litp
= drop_tree_overflow (*minus_litp
);
890 /* Re-associate trees split by the above function. T1 and T2 are
891 either expressions to associate or null. Return the new
892 expression, if any. LOC is the location of the new expression. If
893 we build an operation, do it in TYPE and with CODE. */
896 associate_trees (location_t loc
, tree t1
, tree t2
, enum tree_code code
, tree type
)
900 gcc_assert (t2
== 0 || code
!= MINUS_EXPR
);
906 /* If either input is CODE, a PLUS_EXPR, or a MINUS_EXPR, don't
907 try to fold this since we will have infinite recursion. But do
908 deal with any NEGATE_EXPRs. */
909 if (TREE_CODE (t1
) == code
|| TREE_CODE (t2
) == code
910 || TREE_CODE (t1
) == PLUS_EXPR
|| TREE_CODE (t2
) == PLUS_EXPR
911 || TREE_CODE (t1
) == MINUS_EXPR
|| TREE_CODE (t2
) == MINUS_EXPR
)
913 if (code
== PLUS_EXPR
)
915 if (TREE_CODE (t1
) == NEGATE_EXPR
)
916 return build2_loc (loc
, MINUS_EXPR
, type
,
917 fold_convert_loc (loc
, type
, t2
),
918 fold_convert_loc (loc
, type
,
919 TREE_OPERAND (t1
, 0)));
920 else if (TREE_CODE (t2
) == NEGATE_EXPR
)
921 return build2_loc (loc
, MINUS_EXPR
, type
,
922 fold_convert_loc (loc
, type
, t1
),
923 fold_convert_loc (loc
, type
,
924 TREE_OPERAND (t2
, 0)));
925 else if (integer_zerop (t2
))
926 return fold_convert_loc (loc
, type
, t1
);
928 else if (code
== MINUS_EXPR
)
930 if (integer_zerop (t2
))
931 return fold_convert_loc (loc
, type
, t1
);
934 return build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
935 fold_convert_loc (loc
, type
, t2
));
938 return fold_build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
939 fold_convert_loc (loc
, type
, t2
));
942 /* Check whether TYPE1 and TYPE2 are equivalent integer types, suitable
943 for use in int_const_binop, size_binop and size_diffop. */
946 int_binop_types_match_p (enum tree_code code
, const_tree type1
, const_tree type2
)
948 if (!INTEGRAL_TYPE_P (type1
) && !POINTER_TYPE_P (type1
))
950 if (!INTEGRAL_TYPE_P (type2
) && !POINTER_TYPE_P (type2
))
965 return TYPE_UNSIGNED (type1
) == TYPE_UNSIGNED (type2
)
966 && TYPE_PRECISION (type1
) == TYPE_PRECISION (type2
)
967 && TYPE_MODE (type1
) == TYPE_MODE (type2
);
970 /* Combine two wide ints ARG1 and ARG2 under operation CODE to produce
971 a new constant in RES. Return FALSE if we don't know how to
972 evaluate CODE at compile-time. */
975 wide_int_binop (wide_int
&res
,
976 enum tree_code code
, const wide_int
&arg1
, const wide_int
&arg2
,
977 signop sign
, wi::overflow_type
*overflow
)
980 *overflow
= wi::OVF_NONE
;
984 res
= wi::bit_or (arg1
, arg2
);
988 res
= wi::bit_xor (arg1
, arg2
);
992 res
= wi::bit_and (arg1
, arg2
);
997 if (wi::neg_p (arg2
))
1000 if (code
== RSHIFT_EXPR
)
1008 if (code
== RSHIFT_EXPR
)
1009 /* It's unclear from the C standard whether shifts can overflow.
1010 The following code ignores overflow; perhaps a C standard
1011 interpretation ruling is needed. */
1012 res
= wi::rshift (arg1
, tmp
, sign
);
1014 res
= wi::lshift (arg1
, tmp
);
1019 if (wi::neg_p (arg2
))
1022 if (code
== RROTATE_EXPR
)
1023 code
= LROTATE_EXPR
;
1025 code
= RROTATE_EXPR
;
1030 if (code
== RROTATE_EXPR
)
1031 res
= wi::rrotate (arg1
, tmp
);
1033 res
= wi::lrotate (arg1
, tmp
);
1037 res
= wi::add (arg1
, arg2
, sign
, overflow
);
1041 res
= wi::sub (arg1
, arg2
, sign
, overflow
);
1045 res
= wi::mul (arg1
, arg2
, sign
, overflow
);
1048 case MULT_HIGHPART_EXPR
:
1049 res
= wi::mul_high (arg1
, arg2
, sign
);
1052 case TRUNC_DIV_EXPR
:
1053 case EXACT_DIV_EXPR
:
1056 res
= wi::div_trunc (arg1
, arg2
, sign
, overflow
);
1059 case FLOOR_DIV_EXPR
:
1062 res
= wi::div_floor (arg1
, arg2
, sign
, overflow
);
1068 res
= wi::div_ceil (arg1
, arg2
, sign
, overflow
);
1071 case ROUND_DIV_EXPR
:
1074 res
= wi::div_round (arg1
, arg2
, sign
, overflow
);
1077 case TRUNC_MOD_EXPR
:
1080 res
= wi::mod_trunc (arg1
, arg2
, sign
, overflow
);
1083 case FLOOR_MOD_EXPR
:
1086 res
= wi::mod_floor (arg1
, arg2
, sign
, overflow
);
1092 res
= wi::mod_ceil (arg1
, arg2
, sign
, overflow
);
1095 case ROUND_MOD_EXPR
:
1098 res
= wi::mod_round (arg1
, arg2
, sign
, overflow
);
1102 res
= wi::min (arg1
, arg2
, sign
);
1106 res
= wi::max (arg1
, arg2
, sign
);
1115 /* Combine two poly int's ARG1 and ARG2 under operation CODE to
1116 produce a new constant in RES. Return FALSE if we don't know how
1117 to evaluate CODE at compile-time. */
1120 poly_int_binop (poly_wide_int
&res
, enum tree_code code
,
1121 const_tree arg1
, const_tree arg2
,
1122 signop sign
, wi::overflow_type
*overflow
)
1124 gcc_assert (NUM_POLY_INT_COEFFS
!= 1);
1125 gcc_assert (poly_int_tree_p (arg1
) && poly_int_tree_p (arg2
));
1129 res
= wi::add (wi::to_poly_wide (arg1
),
1130 wi::to_poly_wide (arg2
), sign
, overflow
);
1134 res
= wi::sub (wi::to_poly_wide (arg1
),
1135 wi::to_poly_wide (arg2
), sign
, overflow
);
1139 if (TREE_CODE (arg2
) == INTEGER_CST
)
1140 res
= wi::mul (wi::to_poly_wide (arg1
),
1141 wi::to_wide (arg2
), sign
, overflow
);
1142 else if (TREE_CODE (arg1
) == INTEGER_CST
)
1143 res
= wi::mul (wi::to_poly_wide (arg2
),
1144 wi::to_wide (arg1
), sign
, overflow
);
1150 if (TREE_CODE (arg2
) == INTEGER_CST
)
1151 res
= wi::to_poly_wide (arg1
) << wi::to_wide (arg2
);
1157 if (TREE_CODE (arg2
) != INTEGER_CST
1158 || !can_ior_p (wi::to_poly_wide (arg1
), wi::to_wide (arg2
),
1169 /* Combine two integer constants ARG1 and ARG2 under operation CODE to
1170 produce a new constant. Return NULL_TREE if we don't know how to
1171 evaluate CODE at compile-time. */
1174 int_const_binop (enum tree_code code
, const_tree arg1
, const_tree arg2
,
1177 poly_wide_int poly_res
;
1178 tree type
= TREE_TYPE (arg1
);
1179 signop sign
= TYPE_SIGN (type
);
1180 wi::overflow_type overflow
= wi::OVF_NONE
;
1182 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg2
) == INTEGER_CST
)
1184 wide_int warg1
= wi::to_wide (arg1
), res
;
1185 wide_int warg2
= wi::to_wide (arg2
, TYPE_PRECISION (type
));
1186 if (!wide_int_binop (res
, code
, warg1
, warg2
, sign
, &overflow
))
1190 else if (!poly_int_tree_p (arg1
)
1191 || !poly_int_tree_p (arg2
)
1192 || !poly_int_binop (poly_res
, code
, arg1
, arg2
, sign
, &overflow
))
1194 return force_fit_type (type
, poly_res
, overflowable
,
1195 (((sign
== SIGNED
|| overflowable
== -1)
1197 | TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
)));
1200 /* Return true if binary operation OP distributes over addition in operand
1201 OPNO, with the other operand being held constant. OPNO counts from 1. */
1204 distributes_over_addition_p (tree_code op
, int opno
)
1221 /* Combine two constants ARG1 and ARG2 under operation CODE to produce a new
1222 constant. We assume ARG1 and ARG2 have the same data type, or at least
1223 are the same kind of constant and the same machine mode. Return zero if
1224 combining the constants is not allowed in the current operating mode. */
1227 const_binop (enum tree_code code
, tree arg1
, tree arg2
)
1229 /* Sanity check for the recursive cases. */
1236 if (poly_int_tree_p (arg1
) && poly_int_tree_p (arg2
))
1238 if (code
== POINTER_PLUS_EXPR
)
1239 return int_const_binop (PLUS_EXPR
,
1240 arg1
, fold_convert (TREE_TYPE (arg1
), arg2
));
1242 return int_const_binop (code
, arg1
, arg2
);
1245 if (TREE_CODE (arg1
) == REAL_CST
&& TREE_CODE (arg2
) == REAL_CST
)
1250 REAL_VALUE_TYPE value
;
1251 REAL_VALUE_TYPE result
;
1255 /* The following codes are handled by real_arithmetic. */
1270 d1
= TREE_REAL_CST (arg1
);
1271 d2
= TREE_REAL_CST (arg2
);
1273 type
= TREE_TYPE (arg1
);
1274 mode
= TYPE_MODE (type
);
1276 /* Don't perform operation if we honor signaling NaNs and
1277 either operand is a signaling NaN. */
1278 if (HONOR_SNANS (mode
)
1279 && (REAL_VALUE_ISSIGNALING_NAN (d1
)
1280 || REAL_VALUE_ISSIGNALING_NAN (d2
)))
1283 /* Don't perform operation if it would raise a division
1284 by zero exception. */
1285 if (code
== RDIV_EXPR
1286 && real_equal (&d2
, &dconst0
)
1287 && (flag_trapping_math
|| ! MODE_HAS_INFINITIES (mode
)))
1290 /* If either operand is a NaN, just return it. Otherwise, set up
1291 for floating-point trap; we return an overflow. */
1292 if (REAL_VALUE_ISNAN (d1
))
1294 /* Make resulting NaN value to be qNaN when flag_signaling_nans
1297 t
= build_real (type
, d1
);
1300 else if (REAL_VALUE_ISNAN (d2
))
1302 /* Make resulting NaN value to be qNaN when flag_signaling_nans
1305 t
= build_real (type
, d2
);
1309 inexact
= real_arithmetic (&value
, code
, &d1
, &d2
);
1310 real_convert (&result
, mode
, &value
);
1312 /* Don't constant fold this floating point operation if
1313 the result has overflowed and flag_trapping_math. */
1314 if (flag_trapping_math
1315 && MODE_HAS_INFINITIES (mode
)
1316 && REAL_VALUE_ISINF (result
)
1317 && !REAL_VALUE_ISINF (d1
)
1318 && !REAL_VALUE_ISINF (d2
))
1321 /* Don't constant fold this floating point operation if the
1322 result may dependent upon the run-time rounding mode and
1323 flag_rounding_math is set, or if GCC's software emulation
1324 is unable to accurately represent the result. */
1325 if ((flag_rounding_math
1326 || (MODE_COMPOSITE_P (mode
) && !flag_unsafe_math_optimizations
))
1327 && (inexact
|| !real_identical (&result
, &value
)))
1330 t
= build_real (type
, result
);
1332 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
);
1336 if (TREE_CODE (arg1
) == FIXED_CST
)
1338 FIXED_VALUE_TYPE f1
;
1339 FIXED_VALUE_TYPE f2
;
1340 FIXED_VALUE_TYPE result
;
1345 /* The following codes are handled by fixed_arithmetic. */
1351 case TRUNC_DIV_EXPR
:
1352 if (TREE_CODE (arg2
) != FIXED_CST
)
1354 f2
= TREE_FIXED_CST (arg2
);
1360 if (TREE_CODE (arg2
) != INTEGER_CST
)
1362 wi::tree_to_wide_ref w2
= wi::to_wide (arg2
);
1363 f2
.data
.high
= w2
.elt (1);
1364 f2
.data
.low
= w2
.ulow ();
1373 f1
= TREE_FIXED_CST (arg1
);
1374 type
= TREE_TYPE (arg1
);
1375 sat_p
= TYPE_SATURATING (type
);
1376 overflow_p
= fixed_arithmetic (&result
, code
, &f1
, &f2
, sat_p
);
1377 t
= build_fixed (type
, result
);
1378 /* Propagate overflow flags. */
1379 if (overflow_p
| TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
))
1380 TREE_OVERFLOW (t
) = 1;
1384 if (TREE_CODE (arg1
) == COMPLEX_CST
&& TREE_CODE (arg2
) == COMPLEX_CST
)
1386 tree type
= TREE_TYPE (arg1
);
1387 tree r1
= TREE_REALPART (arg1
);
1388 tree i1
= TREE_IMAGPART (arg1
);
1389 tree r2
= TREE_REALPART (arg2
);
1390 tree i2
= TREE_IMAGPART (arg2
);
1397 real
= const_binop (code
, r1
, r2
);
1398 imag
= const_binop (code
, i1
, i2
);
1402 if (COMPLEX_FLOAT_TYPE_P (type
))
1403 return do_mpc_arg2 (arg1
, arg2
, type
,
1404 /* do_nonfinite= */ folding_initializer
,
1407 real
= const_binop (MINUS_EXPR
,
1408 const_binop (MULT_EXPR
, r1
, r2
),
1409 const_binop (MULT_EXPR
, i1
, i2
));
1410 imag
= const_binop (PLUS_EXPR
,
1411 const_binop (MULT_EXPR
, r1
, i2
),
1412 const_binop (MULT_EXPR
, i1
, r2
));
1416 if (COMPLEX_FLOAT_TYPE_P (type
))
1417 return do_mpc_arg2 (arg1
, arg2
, type
,
1418 /* do_nonfinite= */ folding_initializer
,
1421 case TRUNC_DIV_EXPR
:
1423 case FLOOR_DIV_EXPR
:
1424 case ROUND_DIV_EXPR
:
1425 if (flag_complex_method
== 0)
1427 /* Keep this algorithm in sync with
1428 tree-complex.c:expand_complex_div_straight().
1430 Expand complex division to scalars, straightforward algorithm.
1431 a / b = ((ar*br + ai*bi)/t) + i((ai*br - ar*bi)/t)
1435 = const_binop (PLUS_EXPR
,
1436 const_binop (MULT_EXPR
, r2
, r2
),
1437 const_binop (MULT_EXPR
, i2
, i2
));
1439 = const_binop (PLUS_EXPR
,
1440 const_binop (MULT_EXPR
, r1
, r2
),
1441 const_binop (MULT_EXPR
, i1
, i2
));
1443 = const_binop (MINUS_EXPR
,
1444 const_binop (MULT_EXPR
, i1
, r2
),
1445 const_binop (MULT_EXPR
, r1
, i2
));
1447 real
= const_binop (code
, t1
, magsquared
);
1448 imag
= const_binop (code
, t2
, magsquared
);
1452 /* Keep this algorithm in sync with
1453 tree-complex.c:expand_complex_div_wide().
1455 Expand complex division to scalars, modified algorithm to minimize
1456 overflow with wide input ranges. */
1457 tree compare
= fold_build2 (LT_EXPR
, boolean_type_node
,
1458 fold_abs_const (r2
, TREE_TYPE (type
)),
1459 fold_abs_const (i2
, TREE_TYPE (type
)));
1461 if (integer_nonzerop (compare
))
1463 /* In the TRUE branch, we compute
1465 div = (br * ratio) + bi;
1466 tr = (ar * ratio) + ai;
1467 ti = (ai * ratio) - ar;
1470 tree ratio
= const_binop (code
, r2
, i2
);
1471 tree div
= const_binop (PLUS_EXPR
, i2
,
1472 const_binop (MULT_EXPR
, r2
, ratio
));
1473 real
= const_binop (MULT_EXPR
, r1
, ratio
);
1474 real
= const_binop (PLUS_EXPR
, real
, i1
);
1475 real
= const_binop (code
, real
, div
);
1477 imag
= const_binop (MULT_EXPR
, i1
, ratio
);
1478 imag
= const_binop (MINUS_EXPR
, imag
, r1
);
1479 imag
= const_binop (code
, imag
, div
);
1483 /* In the FALSE branch, we compute
1485 divisor = (d * ratio) + c;
1486 tr = (b * ratio) + a;
1487 ti = b - (a * ratio);
1490 tree ratio
= const_binop (code
, i2
, r2
);
1491 tree div
= const_binop (PLUS_EXPR
, r2
,
1492 const_binop (MULT_EXPR
, i2
, ratio
));
1494 real
= const_binop (MULT_EXPR
, i1
, ratio
);
1495 real
= const_binop (PLUS_EXPR
, real
, r1
);
1496 real
= const_binop (code
, real
, div
);
1498 imag
= const_binop (MULT_EXPR
, r1
, ratio
);
1499 imag
= const_binop (MINUS_EXPR
, i1
, imag
);
1500 imag
= const_binop (code
, imag
, div
);
1510 return build_complex (type
, real
, imag
);
1513 if (TREE_CODE (arg1
) == VECTOR_CST
1514 && TREE_CODE (arg2
) == VECTOR_CST
1515 && known_eq (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)),
1516 TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg2
))))
1518 tree type
= TREE_TYPE (arg1
);
1520 if (VECTOR_CST_STEPPED_P (arg1
)
1521 && VECTOR_CST_STEPPED_P (arg2
))
1522 /* We can operate directly on the encoding if:
1524 a3 - a2 == a2 - a1 && b3 - b2 == b2 - b1
1526 (a3 op b3) - (a2 op b2) == (a2 op b2) - (a1 op b1)
1528 Addition and subtraction are the supported operators
1529 for which this is true. */
1530 step_ok_p
= (code
== PLUS_EXPR
|| code
== MINUS_EXPR
);
1531 else if (VECTOR_CST_STEPPED_P (arg1
))
1532 /* We can operate directly on stepped encodings if:
1536 (a3 op c) - (a2 op c) == (a2 op c) - (a1 op c)
1538 which is true if (x -> x op c) distributes over addition. */
1539 step_ok_p
= distributes_over_addition_p (code
, 1);
1541 /* Similarly in reverse. */
1542 step_ok_p
= distributes_over_addition_p (code
, 2);
1543 tree_vector_builder elts
;
1544 if (!elts
.new_binary_operation (type
, arg1
, arg2
, step_ok_p
))
1546 unsigned int count
= elts
.encoded_nelts ();
1547 for (unsigned int i
= 0; i
< count
; ++i
)
1549 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1550 tree elem2
= VECTOR_CST_ELT (arg2
, i
);
1552 tree elt
= const_binop (code
, elem1
, elem2
);
1554 /* It is possible that const_binop cannot handle the given
1555 code and return NULL_TREE */
1556 if (elt
== NULL_TREE
)
1558 elts
.quick_push (elt
);
1561 return elts
.build ();
1564 /* Shifts allow a scalar offset for a vector. */
1565 if (TREE_CODE (arg1
) == VECTOR_CST
1566 && TREE_CODE (arg2
) == INTEGER_CST
)
1568 tree type
= TREE_TYPE (arg1
);
1569 bool step_ok_p
= distributes_over_addition_p (code
, 1);
1570 tree_vector_builder elts
;
1571 if (!elts
.new_unary_operation (type
, arg1
, step_ok_p
))
1573 unsigned int count
= elts
.encoded_nelts ();
1574 for (unsigned int i
= 0; i
< count
; ++i
)
1576 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1578 tree elt
= const_binop (code
, elem1
, arg2
);
1580 /* It is possible that const_binop cannot handle the given
1581 code and return NULL_TREE. */
1582 if (elt
== NULL_TREE
)
1584 elts
.quick_push (elt
);
1587 return elts
.build ();
1592 /* Overload that adds a TYPE parameter to be able to dispatch
1593 to fold_relational_const. */
1596 const_binop (enum tree_code code
, tree type
, tree arg1
, tree arg2
)
1598 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
1599 return fold_relational_const (code
, type
, arg1
, arg2
);
1601 /* ??? Until we make the const_binop worker take the type of the
1602 result as argument put those cases that need it here. */
1605 case VEC_SERIES_EXPR
:
1606 if (CONSTANT_CLASS_P (arg1
)
1607 && CONSTANT_CLASS_P (arg2
))
1608 return build_vec_series (type
, arg1
, arg2
);
1612 if ((TREE_CODE (arg1
) == REAL_CST
1613 && TREE_CODE (arg2
) == REAL_CST
)
1614 || (TREE_CODE (arg1
) == INTEGER_CST
1615 && TREE_CODE (arg2
) == INTEGER_CST
))
1616 return build_complex (type
, arg1
, arg2
);
1619 case POINTER_DIFF_EXPR
:
1620 if (poly_int_tree_p (arg1
) && poly_int_tree_p (arg2
))
1622 poly_offset_int res
= (wi::to_poly_offset (arg1
)
1623 - wi::to_poly_offset (arg2
));
1624 return force_fit_type (type
, res
, 1,
1625 TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
));
1629 case VEC_PACK_TRUNC_EXPR
:
1630 case VEC_PACK_FIX_TRUNC_EXPR
:
1631 case VEC_PACK_FLOAT_EXPR
:
1633 unsigned int HOST_WIDE_INT out_nelts
, in_nelts
, i
;
1635 if (TREE_CODE (arg1
) != VECTOR_CST
1636 || TREE_CODE (arg2
) != VECTOR_CST
)
1639 if (!VECTOR_CST_NELTS (arg1
).is_constant (&in_nelts
))
1642 out_nelts
= in_nelts
* 2;
1643 gcc_assert (known_eq (in_nelts
, VECTOR_CST_NELTS (arg2
))
1644 && known_eq (out_nelts
, TYPE_VECTOR_SUBPARTS (type
)));
1646 tree_vector_builder
elts (type
, out_nelts
, 1);
1647 for (i
= 0; i
< out_nelts
; i
++)
1649 tree elt
= (i
< in_nelts
1650 ? VECTOR_CST_ELT (arg1
, i
)
1651 : VECTOR_CST_ELT (arg2
, i
- in_nelts
));
1652 elt
= fold_convert_const (code
== VEC_PACK_TRUNC_EXPR
1654 : code
== VEC_PACK_FLOAT_EXPR
1655 ? FLOAT_EXPR
: FIX_TRUNC_EXPR
,
1656 TREE_TYPE (type
), elt
);
1657 if (elt
== NULL_TREE
|| !CONSTANT_CLASS_P (elt
))
1659 elts
.quick_push (elt
);
1662 return elts
.build ();
1665 case VEC_WIDEN_MULT_LO_EXPR
:
1666 case VEC_WIDEN_MULT_HI_EXPR
:
1667 case VEC_WIDEN_MULT_EVEN_EXPR
:
1668 case VEC_WIDEN_MULT_ODD_EXPR
:
1670 unsigned HOST_WIDE_INT out_nelts
, in_nelts
, out
, ofs
, scale
;
1672 if (TREE_CODE (arg1
) != VECTOR_CST
|| TREE_CODE (arg2
) != VECTOR_CST
)
1675 if (!VECTOR_CST_NELTS (arg1
).is_constant (&in_nelts
))
1677 out_nelts
= in_nelts
/ 2;
1678 gcc_assert (known_eq (in_nelts
, VECTOR_CST_NELTS (arg2
))
1679 && known_eq (out_nelts
, TYPE_VECTOR_SUBPARTS (type
)));
1681 if (code
== VEC_WIDEN_MULT_LO_EXPR
)
1682 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? out_nelts
: 0;
1683 else if (code
== VEC_WIDEN_MULT_HI_EXPR
)
1684 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? 0 : out_nelts
;
1685 else if (code
== VEC_WIDEN_MULT_EVEN_EXPR
)
1687 else /* if (code == VEC_WIDEN_MULT_ODD_EXPR) */
1690 tree_vector_builder
elts (type
, out_nelts
, 1);
1691 for (out
= 0; out
< out_nelts
; out
++)
1693 unsigned int in
= (out
<< scale
) + ofs
;
1694 tree t1
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
),
1695 VECTOR_CST_ELT (arg1
, in
));
1696 tree t2
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
),
1697 VECTOR_CST_ELT (arg2
, in
));
1699 if (t1
== NULL_TREE
|| t2
== NULL_TREE
)
1701 tree elt
= const_binop (MULT_EXPR
, t1
, t2
);
1702 if (elt
== NULL_TREE
|| !CONSTANT_CLASS_P (elt
))
1704 elts
.quick_push (elt
);
1707 return elts
.build ();
1713 if (TREE_CODE_CLASS (code
) != tcc_binary
)
1716 /* Make sure type and arg0 have the same saturating flag. */
1717 gcc_checking_assert (TYPE_SATURATING (type
)
1718 == TYPE_SATURATING (TREE_TYPE (arg1
)));
1720 return const_binop (code
, arg1
, arg2
);
1723 /* Compute CODE ARG1 with resulting type TYPE with ARG1 being constant.
1724 Return zero if computing the constants is not possible. */
1727 const_unop (enum tree_code code
, tree type
, tree arg0
)
1729 /* Don't perform the operation, other than NEGATE and ABS, if
1730 flag_signaling_nans is on and the operand is a signaling NaN. */
1731 if (TREE_CODE (arg0
) == REAL_CST
1732 && HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0
)))
1733 && REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg0
))
1734 && code
!= NEGATE_EXPR
1736 && code
!= ABSU_EXPR
)
1743 case FIX_TRUNC_EXPR
:
1744 case FIXED_CONVERT_EXPR
:
1745 return fold_convert_const (code
, type
, arg0
);
1747 case ADDR_SPACE_CONVERT_EXPR
:
1748 /* If the source address is 0, and the source address space
1749 cannot have a valid object at 0, fold to dest type null. */
1750 if (integer_zerop (arg0
)
1751 && !(targetm
.addr_space
.zero_address_valid
1752 (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg0
))))))
1753 return fold_convert_const (code
, type
, arg0
);
1756 case VIEW_CONVERT_EXPR
:
1757 return fold_view_convert_expr (type
, arg0
);
1761 /* Can't call fold_negate_const directly here as that doesn't
1762 handle all cases and we might not be able to negate some
1764 tree tem
= fold_negate_expr (UNKNOWN_LOCATION
, arg0
);
1765 if (tem
&& CONSTANT_CLASS_P (tem
))
1772 if (TREE_CODE (arg0
) == INTEGER_CST
|| TREE_CODE (arg0
) == REAL_CST
)
1773 return fold_abs_const (arg0
, type
);
1777 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1779 tree ipart
= fold_negate_const (TREE_IMAGPART (arg0
),
1781 return build_complex (type
, TREE_REALPART (arg0
), ipart
);
1786 if (TREE_CODE (arg0
) == INTEGER_CST
)
1787 return fold_not_const (arg0
, type
);
1788 else if (POLY_INT_CST_P (arg0
))
1789 return wide_int_to_tree (type
, -poly_int_cst_value (arg0
));
1790 /* Perform BIT_NOT_EXPR on each element individually. */
1791 else if (TREE_CODE (arg0
) == VECTOR_CST
)
1795 /* This can cope with stepped encodings because ~x == -1 - x. */
1796 tree_vector_builder elements
;
1797 elements
.new_unary_operation (type
, arg0
, true);
1798 unsigned int i
, count
= elements
.encoded_nelts ();
1799 for (i
= 0; i
< count
; ++i
)
1801 elem
= VECTOR_CST_ELT (arg0
, i
);
1802 elem
= const_unop (BIT_NOT_EXPR
, TREE_TYPE (type
), elem
);
1803 if (elem
== NULL_TREE
)
1805 elements
.quick_push (elem
);
1808 return elements
.build ();
1812 case TRUTH_NOT_EXPR
:
1813 if (TREE_CODE (arg0
) == INTEGER_CST
)
1814 return constant_boolean_node (integer_zerop (arg0
), type
);
1818 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1819 return fold_convert (type
, TREE_REALPART (arg0
));
1823 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1824 return fold_convert (type
, TREE_IMAGPART (arg0
));
1827 case VEC_UNPACK_LO_EXPR
:
1828 case VEC_UNPACK_HI_EXPR
:
1829 case VEC_UNPACK_FLOAT_LO_EXPR
:
1830 case VEC_UNPACK_FLOAT_HI_EXPR
:
1831 case VEC_UNPACK_FIX_TRUNC_LO_EXPR
:
1832 case VEC_UNPACK_FIX_TRUNC_HI_EXPR
:
1834 unsigned HOST_WIDE_INT out_nelts
, in_nelts
, i
;
1835 enum tree_code subcode
;
1837 if (TREE_CODE (arg0
) != VECTOR_CST
)
1840 if (!VECTOR_CST_NELTS (arg0
).is_constant (&in_nelts
))
1842 out_nelts
= in_nelts
/ 2;
1843 gcc_assert (known_eq (out_nelts
, TYPE_VECTOR_SUBPARTS (type
)));
1845 unsigned int offset
= 0;
1846 if ((!BYTES_BIG_ENDIAN
) ^ (code
== VEC_UNPACK_LO_EXPR
1847 || code
== VEC_UNPACK_FLOAT_LO_EXPR
1848 || code
== VEC_UNPACK_FIX_TRUNC_LO_EXPR
))
1851 if (code
== VEC_UNPACK_LO_EXPR
|| code
== VEC_UNPACK_HI_EXPR
)
1853 else if (code
== VEC_UNPACK_FLOAT_LO_EXPR
1854 || code
== VEC_UNPACK_FLOAT_HI_EXPR
)
1855 subcode
= FLOAT_EXPR
;
1857 subcode
= FIX_TRUNC_EXPR
;
1859 tree_vector_builder
elts (type
, out_nelts
, 1);
1860 for (i
= 0; i
< out_nelts
; i
++)
1862 tree elt
= fold_convert_const (subcode
, TREE_TYPE (type
),
1863 VECTOR_CST_ELT (arg0
, i
+ offset
));
1864 if (elt
== NULL_TREE
|| !CONSTANT_CLASS_P (elt
))
1866 elts
.quick_push (elt
);
1869 return elts
.build ();
1872 case VEC_DUPLICATE_EXPR
:
1873 if (CONSTANT_CLASS_P (arg0
))
1874 return build_vector_from_val (type
, arg0
);
1884 /* Create a sizetype INT_CST node with NUMBER sign extended. KIND
1885 indicates which particular sizetype to create. */
1888 size_int_kind (poly_int64 number
, enum size_type_kind kind
)
1890 return build_int_cst (sizetype_tab
[(int) kind
], number
);
1893 /* Combine operands OP1 and OP2 with arithmetic operation CODE. CODE
1894 is a tree code. The type of the result is taken from the operands.
1895 Both must be equivalent integer types, ala int_binop_types_match_p.
1896 If the operands are constant, so is the result. */
1899 size_binop_loc (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
)
1901 tree type
= TREE_TYPE (arg0
);
1903 if (arg0
== error_mark_node
|| arg1
== error_mark_node
)
1904 return error_mark_node
;
1906 gcc_assert (int_binop_types_match_p (code
, TREE_TYPE (arg0
),
1909 /* Handle the special case of two poly_int constants faster. */
1910 if (poly_int_tree_p (arg0
) && poly_int_tree_p (arg1
))
1912 /* And some specific cases even faster than that. */
1913 if (code
== PLUS_EXPR
)
1915 if (integer_zerop (arg0
)
1916 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg0
)))
1918 if (integer_zerop (arg1
)
1919 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg1
)))
1922 else if (code
== MINUS_EXPR
)
1924 if (integer_zerop (arg1
)
1925 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg1
)))
1928 else if (code
== MULT_EXPR
)
1930 if (integer_onep (arg0
)
1931 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg0
)))
1935 /* Handle general case of two integer constants. For sizetype
1936 constant calculations we always want to know about overflow,
1937 even in the unsigned case. */
1938 tree res
= int_const_binop (code
, arg0
, arg1
, -1);
1939 if (res
!= NULL_TREE
)
1943 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
1946 /* Given two values, either both of sizetype or both of bitsizetype,
1947 compute the difference between the two values. Return the value
1948 in signed type corresponding to the type of the operands. */
1951 size_diffop_loc (location_t loc
, tree arg0
, tree arg1
)
1953 tree type
= TREE_TYPE (arg0
);
1956 gcc_assert (int_binop_types_match_p (MINUS_EXPR
, TREE_TYPE (arg0
),
1959 /* If the type is already signed, just do the simple thing. */
1960 if (!TYPE_UNSIGNED (type
))
1961 return size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
);
1963 if (type
== sizetype
)
1965 else if (type
== bitsizetype
)
1966 ctype
= sbitsizetype
;
1968 ctype
= signed_type_for (type
);
1970 /* If either operand is not a constant, do the conversions to the signed
1971 type and subtract. The hardware will do the right thing with any
1972 overflow in the subtraction. */
1973 if (TREE_CODE (arg0
) != INTEGER_CST
|| TREE_CODE (arg1
) != INTEGER_CST
)
1974 return size_binop_loc (loc
, MINUS_EXPR
,
1975 fold_convert_loc (loc
, ctype
, arg0
),
1976 fold_convert_loc (loc
, ctype
, arg1
));
1978 /* If ARG0 is larger than ARG1, subtract and return the result in CTYPE.
1979 Otherwise, subtract the other way, convert to CTYPE (we know that can't
1980 overflow) and negate (which can't either). Special-case a result
1981 of zero while we're here. */
1982 if (tree_int_cst_equal (arg0
, arg1
))
1983 return build_int_cst (ctype
, 0);
1984 else if (tree_int_cst_lt (arg1
, arg0
))
1985 return fold_convert_loc (loc
, ctype
,
1986 size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
));
1988 return size_binop_loc (loc
, MINUS_EXPR
, build_int_cst (ctype
, 0),
1989 fold_convert_loc (loc
, ctype
,
1990 size_binop_loc (loc
,
1995 /* A subroutine of fold_convert_const handling conversions of an
1996 INTEGER_CST to another integer type. */
1999 fold_convert_const_int_from_int (tree type
, const_tree arg1
)
2001 /* Given an integer constant, make new constant with new type,
2002 appropriately sign-extended or truncated. Use widest_int
2003 so that any extension is done according ARG1's type. */
2004 return force_fit_type (type
, wi::to_widest (arg1
),
2005 !POINTER_TYPE_P (TREE_TYPE (arg1
)),
2006 TREE_OVERFLOW (arg1
));
2009 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2010 to an integer type. */
2013 fold_convert_const_int_from_real (enum tree_code code
, tree type
, const_tree arg1
)
2015 bool overflow
= false;
2018 /* The following code implements the floating point to integer
2019 conversion rules required by the Java Language Specification,
2020 that IEEE NaNs are mapped to zero and values that overflow
2021 the target precision saturate, i.e. values greater than
2022 INT_MAX are mapped to INT_MAX, and values less than INT_MIN
2023 are mapped to INT_MIN. These semantics are allowed by the
2024 C and C++ standards that simply state that the behavior of
2025 FP-to-integer conversion is unspecified upon overflow. */
2029 REAL_VALUE_TYPE x
= TREE_REAL_CST (arg1
);
2033 case FIX_TRUNC_EXPR
:
2034 real_trunc (&r
, VOIDmode
, &x
);
2041 /* If R is NaN, return zero and show we have an overflow. */
2042 if (REAL_VALUE_ISNAN (r
))
2045 val
= wi::zero (TYPE_PRECISION (type
));
2048 /* See if R is less than the lower bound or greater than the
2053 tree lt
= TYPE_MIN_VALUE (type
);
2054 REAL_VALUE_TYPE l
= real_value_from_int_cst (NULL_TREE
, lt
);
2055 if (real_less (&r
, &l
))
2058 val
= wi::to_wide (lt
);
2064 tree ut
= TYPE_MAX_VALUE (type
);
2067 REAL_VALUE_TYPE u
= real_value_from_int_cst (NULL_TREE
, ut
);
2068 if (real_less (&u
, &r
))
2071 val
= wi::to_wide (ut
);
2077 val
= real_to_integer (&r
, &overflow
, TYPE_PRECISION (type
));
2079 t
= force_fit_type (type
, val
, -1, overflow
| TREE_OVERFLOW (arg1
));
2083 /* A subroutine of fold_convert_const handling conversions of a
2084 FIXED_CST to an integer type. */
2087 fold_convert_const_int_from_fixed (tree type
, const_tree arg1
)
2090 double_int temp
, temp_trunc
;
2093 /* Right shift FIXED_CST to temp by fbit. */
2094 temp
= TREE_FIXED_CST (arg1
).data
;
2095 mode
= TREE_FIXED_CST (arg1
).mode
;
2096 if (GET_MODE_FBIT (mode
) < HOST_BITS_PER_DOUBLE_INT
)
2098 temp
= temp
.rshift (GET_MODE_FBIT (mode
),
2099 HOST_BITS_PER_DOUBLE_INT
,
2100 SIGNED_FIXED_POINT_MODE_P (mode
));
2102 /* Left shift temp to temp_trunc by fbit. */
2103 temp_trunc
= temp
.lshift (GET_MODE_FBIT (mode
),
2104 HOST_BITS_PER_DOUBLE_INT
,
2105 SIGNED_FIXED_POINT_MODE_P (mode
));
2109 temp
= double_int_zero
;
2110 temp_trunc
= double_int_zero
;
2113 /* If FIXED_CST is negative, we need to round the value toward 0.
2114 By checking if the fractional bits are not zero to add 1 to temp. */
2115 if (SIGNED_FIXED_POINT_MODE_P (mode
)
2116 && temp_trunc
.is_negative ()
2117 && TREE_FIXED_CST (arg1
).data
!= temp_trunc
)
2118 temp
+= double_int_one
;
2120 /* Given a fixed-point constant, make new constant with new type,
2121 appropriately sign-extended or truncated. */
2122 t
= force_fit_type (type
, temp
, -1,
2123 (temp
.is_negative ()
2124 && (TYPE_UNSIGNED (type
)
2125 < TYPE_UNSIGNED (TREE_TYPE (arg1
))))
2126 | TREE_OVERFLOW (arg1
));
2131 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2132 to another floating point type. */
2135 fold_convert_const_real_from_real (tree type
, const_tree arg1
)
2137 REAL_VALUE_TYPE value
;
2140 /* Don't perform the operation if flag_signaling_nans is on
2141 and the operand is a signaling NaN. */
2142 if (HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg1
)))
2143 && REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg1
)))
2146 real_convert (&value
, TYPE_MODE (type
), &TREE_REAL_CST (arg1
));
2147 t
= build_real (type
, value
);
2149 /* If converting an infinity or NAN to a representation that doesn't
2150 have one, set the overflow bit so that we can produce some kind of
2151 error message at the appropriate point if necessary. It's not the
2152 most user-friendly message, but it's better than nothing. */
2153 if (REAL_VALUE_ISINF (TREE_REAL_CST (arg1
))
2154 && !MODE_HAS_INFINITIES (TYPE_MODE (type
)))
2155 TREE_OVERFLOW (t
) = 1;
2156 else if (REAL_VALUE_ISNAN (TREE_REAL_CST (arg1
))
2157 && !MODE_HAS_NANS (TYPE_MODE (type
)))
2158 TREE_OVERFLOW (t
) = 1;
2159 /* Regular overflow, conversion produced an infinity in a mode that
2160 can't represent them. */
2161 else if (!MODE_HAS_INFINITIES (TYPE_MODE (type
))
2162 && REAL_VALUE_ISINF (value
)
2163 && !REAL_VALUE_ISINF (TREE_REAL_CST (arg1
)))
2164 TREE_OVERFLOW (t
) = 1;
2166 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
2170 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
2171 to a floating point type. */
2174 fold_convert_const_real_from_fixed (tree type
, const_tree arg1
)
2176 REAL_VALUE_TYPE value
;
2179 real_convert_from_fixed (&value
, SCALAR_FLOAT_TYPE_MODE (type
),
2180 &TREE_FIXED_CST (arg1
));
2181 t
= build_real (type
, value
);
2183 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
2187 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
2188 to another fixed-point type. */
2191 fold_convert_const_fixed_from_fixed (tree type
, const_tree arg1
)
2193 FIXED_VALUE_TYPE value
;
2197 overflow_p
= fixed_convert (&value
, SCALAR_TYPE_MODE (type
),
2198 &TREE_FIXED_CST (arg1
), TYPE_SATURATING (type
));
2199 t
= build_fixed (type
, value
);
2201 /* Propagate overflow flags. */
2202 if (overflow_p
| TREE_OVERFLOW (arg1
))
2203 TREE_OVERFLOW (t
) = 1;
2207 /* A subroutine of fold_convert_const handling conversions an INTEGER_CST
2208 to a fixed-point type. */
2211 fold_convert_const_fixed_from_int (tree type
, const_tree arg1
)
2213 FIXED_VALUE_TYPE value
;
2218 gcc_assert (TREE_INT_CST_NUNITS (arg1
) <= 2);
2220 di
.low
= TREE_INT_CST_ELT (arg1
, 0);
2221 if (TREE_INT_CST_NUNITS (arg1
) == 1)
2222 di
.high
= (HOST_WIDE_INT
) di
.low
< 0 ? HOST_WIDE_INT_M1
: 0;
2224 di
.high
= TREE_INT_CST_ELT (arg1
, 1);
2226 overflow_p
= fixed_convert_from_int (&value
, SCALAR_TYPE_MODE (type
), di
,
2227 TYPE_UNSIGNED (TREE_TYPE (arg1
)),
2228 TYPE_SATURATING (type
));
2229 t
= build_fixed (type
, value
);
2231 /* Propagate overflow flags. */
2232 if (overflow_p
| TREE_OVERFLOW (arg1
))
2233 TREE_OVERFLOW (t
) = 1;
2237 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2238 to a fixed-point type. */
2241 fold_convert_const_fixed_from_real (tree type
, const_tree arg1
)
2243 FIXED_VALUE_TYPE value
;
2247 overflow_p
= fixed_convert_from_real (&value
, SCALAR_TYPE_MODE (type
),
2248 &TREE_REAL_CST (arg1
),
2249 TYPE_SATURATING (type
));
2250 t
= build_fixed (type
, value
);
2252 /* Propagate overflow flags. */
2253 if (overflow_p
| TREE_OVERFLOW (arg1
))
2254 TREE_OVERFLOW (t
) = 1;
2258 /* Attempt to fold type conversion operation CODE of expression ARG1 to
2259 type TYPE. If no simplification can be done return NULL_TREE. */
2262 fold_convert_const (enum tree_code code
, tree type
, tree arg1
)
2264 tree arg_type
= TREE_TYPE (arg1
);
2265 if (arg_type
== type
)
2268 /* We can't widen types, since the runtime value could overflow the
2269 original type before being extended to the new type. */
2270 if (POLY_INT_CST_P (arg1
)
2271 && (POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
))
2272 && TYPE_PRECISION (type
) <= TYPE_PRECISION (arg_type
))
2273 return build_poly_int_cst (type
,
2274 poly_wide_int::from (poly_int_cst_value (arg1
),
2275 TYPE_PRECISION (type
),
2276 TYPE_SIGN (arg_type
)));
2278 if (POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
)
2279 || TREE_CODE (type
) == OFFSET_TYPE
)
2281 if (TREE_CODE (arg1
) == INTEGER_CST
)
2282 return fold_convert_const_int_from_int (type
, arg1
);
2283 else if (TREE_CODE (arg1
) == REAL_CST
)
2284 return fold_convert_const_int_from_real (code
, type
, arg1
);
2285 else if (TREE_CODE (arg1
) == FIXED_CST
)
2286 return fold_convert_const_int_from_fixed (type
, arg1
);
2288 else if (TREE_CODE (type
) == REAL_TYPE
)
2290 if (TREE_CODE (arg1
) == INTEGER_CST
)
2291 return build_real_from_int_cst (type
, arg1
);
2292 else if (TREE_CODE (arg1
) == REAL_CST
)
2293 return fold_convert_const_real_from_real (type
, arg1
);
2294 else if (TREE_CODE (arg1
) == FIXED_CST
)
2295 return fold_convert_const_real_from_fixed (type
, arg1
);
2297 else if (TREE_CODE (type
) == FIXED_POINT_TYPE
)
2299 if (TREE_CODE (arg1
) == FIXED_CST
)
2300 return fold_convert_const_fixed_from_fixed (type
, arg1
);
2301 else if (TREE_CODE (arg1
) == INTEGER_CST
)
2302 return fold_convert_const_fixed_from_int (type
, arg1
);
2303 else if (TREE_CODE (arg1
) == REAL_CST
)
2304 return fold_convert_const_fixed_from_real (type
, arg1
);
2306 else if (TREE_CODE (type
) == VECTOR_TYPE
)
2308 if (TREE_CODE (arg1
) == VECTOR_CST
2309 && known_eq (TYPE_VECTOR_SUBPARTS (type
), VECTOR_CST_NELTS (arg1
)))
2311 tree elttype
= TREE_TYPE (type
);
2312 tree arg1_elttype
= TREE_TYPE (TREE_TYPE (arg1
));
2313 /* We can't handle steps directly when extending, since the
2314 values need to wrap at the original precision first. */
2316 = (INTEGRAL_TYPE_P (elttype
)
2317 && INTEGRAL_TYPE_P (arg1_elttype
)
2318 && TYPE_PRECISION (elttype
) <= TYPE_PRECISION (arg1_elttype
));
2319 tree_vector_builder v
;
2320 if (!v
.new_unary_operation (type
, arg1
, step_ok_p
))
2322 unsigned int len
= v
.encoded_nelts ();
2323 for (unsigned int i
= 0; i
< len
; ++i
)
2325 tree elt
= VECTOR_CST_ELT (arg1
, i
);
2326 tree cvt
= fold_convert_const (code
, elttype
, elt
);
2327 if (cvt
== NULL_TREE
)
2337 /* Construct a vector of zero elements of vector type TYPE. */
2340 build_zero_vector (tree type
)
2344 t
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), integer_zero_node
);
2345 return build_vector_from_val (type
, t
);
2348 /* Returns true, if ARG is convertible to TYPE using a NOP_EXPR. */
2351 fold_convertible_p (const_tree type
, const_tree arg
)
2353 tree orig
= TREE_TYPE (arg
);
2358 if (TREE_CODE (arg
) == ERROR_MARK
2359 || TREE_CODE (type
) == ERROR_MARK
2360 || TREE_CODE (orig
) == ERROR_MARK
)
2363 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2366 switch (TREE_CODE (type
))
2368 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2369 case POINTER_TYPE
: case REFERENCE_TYPE
:
2371 return (INTEGRAL_TYPE_P (orig
)
2372 || (POINTER_TYPE_P (orig
)
2373 && TYPE_PRECISION (type
) <= TYPE_PRECISION (orig
))
2374 || TREE_CODE (orig
) == OFFSET_TYPE
);
2377 case FIXED_POINT_TYPE
:
2379 return TREE_CODE (type
) == TREE_CODE (orig
);
2382 return (VECTOR_TYPE_P (orig
)
2383 && known_eq (TYPE_VECTOR_SUBPARTS (type
),
2384 TYPE_VECTOR_SUBPARTS (orig
))
2385 && fold_convertible_p (TREE_TYPE (type
), TREE_TYPE (orig
)));
2392 /* Convert expression ARG to type TYPE. Used by the middle-end for
2393 simple conversions in preference to calling the front-end's convert. */
2396 fold_convert_loc (location_t loc
, tree type
, tree arg
)
2398 tree orig
= TREE_TYPE (arg
);
2404 if (TREE_CODE (arg
) == ERROR_MARK
2405 || TREE_CODE (type
) == ERROR_MARK
2406 || TREE_CODE (orig
) == ERROR_MARK
)
2407 return error_mark_node
;
2409 switch (TREE_CODE (type
))
2412 case REFERENCE_TYPE
:
2413 /* Handle conversions between pointers to different address spaces. */
2414 if (POINTER_TYPE_P (orig
)
2415 && (TYPE_ADDR_SPACE (TREE_TYPE (type
))
2416 != TYPE_ADDR_SPACE (TREE_TYPE (orig
))))
2417 return fold_build1_loc (loc
, ADDR_SPACE_CONVERT_EXPR
, type
, arg
);
2420 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2422 if (TREE_CODE (arg
) == INTEGER_CST
)
2424 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2425 if (tem
!= NULL_TREE
)
2428 if (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2429 || TREE_CODE (orig
) == OFFSET_TYPE
)
2430 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2431 if (TREE_CODE (orig
) == COMPLEX_TYPE
)
2432 return fold_convert_loc (loc
, type
,
2433 fold_build1_loc (loc
, REALPART_EXPR
,
2434 TREE_TYPE (orig
), arg
));
2435 gcc_assert (TREE_CODE (orig
) == VECTOR_TYPE
2436 && tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2437 return fold_build1_loc (loc
, VIEW_CONVERT_EXPR
, type
, arg
);
2440 if (TREE_CODE (arg
) == INTEGER_CST
)
2442 tem
= fold_convert_const (FLOAT_EXPR
, type
, arg
);
2443 if (tem
!= NULL_TREE
)
2446 else if (TREE_CODE (arg
) == REAL_CST
)
2448 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2449 if (tem
!= NULL_TREE
)
2452 else if (TREE_CODE (arg
) == FIXED_CST
)
2454 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2455 if (tem
!= NULL_TREE
)
2459 switch (TREE_CODE (orig
))
2462 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2463 case POINTER_TYPE
: case REFERENCE_TYPE
:
2464 return fold_build1_loc (loc
, FLOAT_EXPR
, type
, arg
);
2467 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2469 case FIXED_POINT_TYPE
:
2470 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2473 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2474 return fold_convert_loc (loc
, type
, tem
);
2480 case FIXED_POINT_TYPE
:
2481 if (TREE_CODE (arg
) == FIXED_CST
|| TREE_CODE (arg
) == INTEGER_CST
2482 || TREE_CODE (arg
) == REAL_CST
)
2484 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2485 if (tem
!= NULL_TREE
)
2486 goto fold_convert_exit
;
2489 switch (TREE_CODE (orig
))
2491 case FIXED_POINT_TYPE
:
2496 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2499 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2500 return fold_convert_loc (loc
, type
, tem
);
2507 switch (TREE_CODE (orig
))
2510 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2511 case POINTER_TYPE
: case REFERENCE_TYPE
:
2513 case FIXED_POINT_TYPE
:
2514 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
2515 fold_convert_loc (loc
, TREE_TYPE (type
), arg
),
2516 fold_convert_loc (loc
, TREE_TYPE (type
),
2517 integer_zero_node
));
2522 if (TREE_CODE (arg
) == COMPLEX_EXPR
)
2524 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2525 TREE_OPERAND (arg
, 0));
2526 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2527 TREE_OPERAND (arg
, 1));
2528 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2531 arg
= save_expr (arg
);
2532 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2533 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, TREE_TYPE (orig
), arg
);
2534 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
), rpart
);
2535 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
), ipart
);
2536 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2544 if (integer_zerop (arg
))
2545 return build_zero_vector (type
);
2546 gcc_assert (tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2547 gcc_assert (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2548 || TREE_CODE (orig
) == VECTOR_TYPE
);
2549 return fold_build1_loc (loc
, VIEW_CONVERT_EXPR
, type
, arg
);
2552 tem
= fold_ignored_result (arg
);
2553 return fold_build1_loc (loc
, NOP_EXPR
, type
, tem
);
2556 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2557 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2561 protected_set_expr_location_unshare (tem
, loc
);
2565 /* Return false if expr can be assumed not to be an lvalue, true
2569 maybe_lvalue_p (const_tree x
)
2571 /* We only need to wrap lvalue tree codes. */
2572 switch (TREE_CODE (x
))
2585 case ARRAY_RANGE_REF
:
2591 case PREINCREMENT_EXPR
:
2592 case PREDECREMENT_EXPR
:
2594 case TRY_CATCH_EXPR
:
2595 case WITH_CLEANUP_EXPR
:
2601 case VIEW_CONVERT_EXPR
:
2605 /* Assume the worst for front-end tree codes. */
2606 if ((int)TREE_CODE (x
) >= NUM_TREE_CODES
)
2614 /* Return an expr equal to X but certainly not valid as an lvalue. */
2617 non_lvalue_loc (location_t loc
, tree x
)
2619 /* While we are in GIMPLE, NON_LVALUE_EXPR doesn't mean anything to
2624 if (! maybe_lvalue_p (x
))
2626 return build1_loc (loc
, NON_LVALUE_EXPR
, TREE_TYPE (x
), x
);
2629 /* When pedantic, return an expr equal to X but certainly not valid as a
2630 pedantic lvalue. Otherwise, return X. */
2633 pedantic_non_lvalue_loc (location_t loc
, tree x
)
2635 return protected_set_expr_location_unshare (x
, loc
);
2638 /* Given a tree comparison code, return the code that is the logical inverse.
2639 It is generally not safe to do this for floating-point comparisons, except
2640 for EQ_EXPR, NE_EXPR, ORDERED_EXPR and UNORDERED_EXPR, so we return
2641 ERROR_MARK in this case. */
2644 invert_tree_comparison (enum tree_code code
, bool honor_nans
)
2646 if (honor_nans
&& flag_trapping_math
&& code
!= EQ_EXPR
&& code
!= NE_EXPR
2647 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
)
2657 return honor_nans
? UNLE_EXPR
: LE_EXPR
;
2659 return honor_nans
? UNLT_EXPR
: LT_EXPR
;
2661 return honor_nans
? UNGE_EXPR
: GE_EXPR
;
2663 return honor_nans
? UNGT_EXPR
: GT_EXPR
;
2677 return UNORDERED_EXPR
;
2678 case UNORDERED_EXPR
:
2679 return ORDERED_EXPR
;
2685 /* Similar, but return the comparison that results if the operands are
2686 swapped. This is safe for floating-point. */
2689 swap_tree_comparison (enum tree_code code
)
2696 case UNORDERED_EXPR
:
2722 /* Convert a comparison tree code from an enum tree_code representation
2723 into a compcode bit-based encoding. This function is the inverse of
2724 compcode_to_comparison. */
2726 static enum comparison_code
2727 comparison_to_compcode (enum tree_code code
)
2744 return COMPCODE_ORD
;
2745 case UNORDERED_EXPR
:
2746 return COMPCODE_UNORD
;
2748 return COMPCODE_UNLT
;
2750 return COMPCODE_UNEQ
;
2752 return COMPCODE_UNLE
;
2754 return COMPCODE_UNGT
;
2756 return COMPCODE_LTGT
;
2758 return COMPCODE_UNGE
;
2764 /* Convert a compcode bit-based encoding of a comparison operator back
2765 to GCC's enum tree_code representation. This function is the
2766 inverse of comparison_to_compcode. */
2768 static enum tree_code
2769 compcode_to_comparison (enum comparison_code code
)
2786 return ORDERED_EXPR
;
2787 case COMPCODE_UNORD
:
2788 return UNORDERED_EXPR
;
2806 /* Return true if COND1 tests the opposite condition of COND2. */
2809 inverse_conditions_p (const_tree cond1
, const_tree cond2
)
2811 return (COMPARISON_CLASS_P (cond1
)
2812 && COMPARISON_CLASS_P (cond2
)
2813 && (invert_tree_comparison
2815 HONOR_NANS (TREE_OPERAND (cond1
, 0))) == TREE_CODE (cond2
))
2816 && operand_equal_p (TREE_OPERAND (cond1
, 0),
2817 TREE_OPERAND (cond2
, 0), 0)
2818 && operand_equal_p (TREE_OPERAND (cond1
, 1),
2819 TREE_OPERAND (cond2
, 1), 0));
2822 /* Return a tree for the comparison which is the combination of
2823 doing the AND or OR (depending on CODE) of the two operations LCODE
2824 and RCODE on the identical operands LL_ARG and LR_ARG. Take into account
2825 the possibility of trapping if the mode has NaNs, and return NULL_TREE
2826 if this makes the transformation invalid. */
2829 combine_comparisons (location_t loc
,
2830 enum tree_code code
, enum tree_code lcode
,
2831 enum tree_code rcode
, tree truth_type
,
2832 tree ll_arg
, tree lr_arg
)
2834 bool honor_nans
= HONOR_NANS (ll_arg
);
2835 enum comparison_code lcompcode
= comparison_to_compcode (lcode
);
2836 enum comparison_code rcompcode
= comparison_to_compcode (rcode
);
2841 case TRUTH_AND_EXPR
: case TRUTH_ANDIF_EXPR
:
2842 compcode
= lcompcode
& rcompcode
;
2845 case TRUTH_OR_EXPR
: case TRUTH_ORIF_EXPR
:
2846 compcode
= lcompcode
| rcompcode
;
2855 /* Eliminate unordered comparisons, as well as LTGT and ORD
2856 which are not used unless the mode has NaNs. */
2857 compcode
&= ~COMPCODE_UNORD
;
2858 if (compcode
== COMPCODE_LTGT
)
2859 compcode
= COMPCODE_NE
;
2860 else if (compcode
== COMPCODE_ORD
)
2861 compcode
= COMPCODE_TRUE
;
2863 else if (flag_trapping_math
)
2865 /* Check that the original operation and the optimized ones will trap
2866 under the same condition. */
2867 bool ltrap
= (lcompcode
& COMPCODE_UNORD
) == 0
2868 && (lcompcode
!= COMPCODE_EQ
)
2869 && (lcompcode
!= COMPCODE_ORD
);
2870 bool rtrap
= (rcompcode
& COMPCODE_UNORD
) == 0
2871 && (rcompcode
!= COMPCODE_EQ
)
2872 && (rcompcode
!= COMPCODE_ORD
);
2873 bool trap
= (compcode
& COMPCODE_UNORD
) == 0
2874 && (compcode
!= COMPCODE_EQ
)
2875 && (compcode
!= COMPCODE_ORD
);
2877 /* In a short-circuited boolean expression the LHS might be
2878 such that the RHS, if evaluated, will never trap. For
2879 example, in ORD (x, y) && (x < y), we evaluate the RHS only
2880 if neither x nor y is NaN. (This is a mixed blessing: for
2881 example, the expression above will never trap, hence
2882 optimizing it to x < y would be invalid). */
2883 if ((code
== TRUTH_ORIF_EXPR
&& (lcompcode
& COMPCODE_UNORD
))
2884 || (code
== TRUTH_ANDIF_EXPR
&& !(lcompcode
& COMPCODE_UNORD
)))
2887 /* If the comparison was short-circuited, and only the RHS
2888 trapped, we may now generate a spurious trap. */
2890 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
2893 /* If we changed the conditions that cause a trap, we lose. */
2894 if ((ltrap
|| rtrap
) != trap
)
2898 if (compcode
== COMPCODE_TRUE
)
2899 return constant_boolean_node (true, truth_type
);
2900 else if (compcode
== COMPCODE_FALSE
)
2901 return constant_boolean_node (false, truth_type
);
2904 enum tree_code tcode
;
2906 tcode
= compcode_to_comparison ((enum comparison_code
) compcode
);
2907 return fold_build2_loc (loc
, tcode
, truth_type
, ll_arg
, lr_arg
);
2911 /* Return nonzero if two operands (typically of the same tree node)
2912 are necessarily equal. FLAGS modifies behavior as follows:
2914 If OEP_ONLY_CONST is set, only return nonzero for constants.
2915 This function tests whether the operands are indistinguishable;
2916 it does not test whether they are equal using C's == operation.
2917 The distinction is important for IEEE floating point, because
2918 (1) -0.0 and 0.0 are distinguishable, but -0.0==0.0, and
2919 (2) two NaNs may be indistinguishable, but NaN!=NaN.
2921 If OEP_ONLY_CONST is unset, a VAR_DECL is considered equal to itself
2922 even though it may hold multiple values during a function.
2923 This is because a GCC tree node guarantees that nothing else is
2924 executed between the evaluation of its "operands" (which may often
2925 be evaluated in arbitrary order). Hence if the operands themselves
2926 don't side-effect, the VAR_DECLs, PARM_DECLs etc... must hold the
2927 same value in each operand/subexpression. Hence leaving OEP_ONLY_CONST
2928 unset means assuming isochronic (or instantaneous) tree equivalence.
2929 Unless comparing arbitrary expression trees, such as from different
2930 statements, this flag can usually be left unset.
2932 If OEP_PURE_SAME is set, then pure functions with identical arguments
2933 are considered the same. It is used when the caller has other ways
2934 to ensure that global memory is unchanged in between.
2936 If OEP_ADDRESS_OF is set, we are actually comparing addresses of objects,
2937 not values of expressions.
2939 If OEP_LEXICOGRAPHIC is set, then also handle expressions with side-effects
2940 such as MODIFY_EXPR, RETURN_EXPR, as well as STATEMENT_LISTs.
2942 If OEP_BITWISE is set, then require the values to be bitwise identical
2943 rather than simply numerically equal. Do not take advantage of things
2944 like math-related flags or undefined behavior; only return true for
2945 values that are provably bitwise identical in all circumstances.
2947 Unless OEP_MATCH_SIDE_EFFECTS is set, the function returns false on
2948 any operand with side effect. This is unnecesarily conservative in the
2949 case we know that arg0 and arg1 are in disjoint code paths (such as in
2950 ?: operator). In addition OEP_MATCH_SIDE_EFFECTS is used when comparing
2951 addresses with TREE_CONSTANT flag set so we know that &var == &var
2952 even if var is volatile. */
2955 operand_compare::operand_equal_p (const_tree arg0
, const_tree arg1
,
2959 if (verify_hash_value (arg0
, arg1
, flags
, &r
))
2962 STRIP_ANY_LOCATION_WRAPPER (arg0
);
2963 STRIP_ANY_LOCATION_WRAPPER (arg1
);
2965 /* If either is ERROR_MARK, they aren't equal. */
2966 if (TREE_CODE (arg0
) == ERROR_MARK
|| TREE_CODE (arg1
) == ERROR_MARK
2967 || TREE_TYPE (arg0
) == error_mark_node
2968 || TREE_TYPE (arg1
) == error_mark_node
)
2971 /* Similar, if either does not have a type (like a template id),
2972 they aren't equal. */
2973 if (!TREE_TYPE (arg0
) || !TREE_TYPE (arg1
))
2976 /* Bitwise identity makes no sense if the values have different layouts. */
2977 if ((flags
& OEP_BITWISE
)
2978 && !tree_nop_conversion_p (TREE_TYPE (arg0
), TREE_TYPE (arg1
)))
2981 /* We cannot consider pointers to different address space equal. */
2982 if (POINTER_TYPE_P (TREE_TYPE (arg0
))
2983 && POINTER_TYPE_P (TREE_TYPE (arg1
))
2984 && (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg0
)))
2985 != TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg1
)))))
2988 /* Check equality of integer constants before bailing out due to
2989 precision differences. */
2990 if (TREE_CODE (arg0
) == INTEGER_CST
&& TREE_CODE (arg1
) == INTEGER_CST
)
2992 /* Address of INTEGER_CST is not defined; check that we did not forget
2993 to drop the OEP_ADDRESS_OF flags. */
2994 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
2995 return tree_int_cst_equal (arg0
, arg1
);
2998 if (!(flags
& OEP_ADDRESS_OF
))
3000 /* If both types don't have the same signedness, then we can't consider
3001 them equal. We must check this before the STRIP_NOPS calls
3002 because they may change the signedness of the arguments. As pointers
3003 strictly don't have a signedness, require either two pointers or
3004 two non-pointers as well. */
3005 if (TYPE_UNSIGNED (TREE_TYPE (arg0
)) != TYPE_UNSIGNED (TREE_TYPE (arg1
))
3006 || POINTER_TYPE_P (TREE_TYPE (arg0
))
3007 != POINTER_TYPE_P (TREE_TYPE (arg1
)))
3010 /* If both types don't have the same precision, then it is not safe
3012 if (element_precision (TREE_TYPE (arg0
))
3013 != element_precision (TREE_TYPE (arg1
)))
3020 /* FIXME: Fortran FE currently produce ADDR_EXPR of NOP_EXPR. Enable the
3021 sanity check once the issue is solved. */
3023 /* Addresses of conversions and SSA_NAMEs (and many other things)
3024 are not defined. Check that we did not forget to drop the
3025 OEP_ADDRESS_OF/OEP_CONSTANT_ADDRESS_OF flags. */
3026 gcc_checking_assert (!CONVERT_EXPR_P (arg0
) && !CONVERT_EXPR_P (arg1
)
3027 && TREE_CODE (arg0
) != SSA_NAME
);
3030 /* In case both args are comparisons but with different comparison
3031 code, try to swap the comparison operands of one arg to produce
3032 a match and compare that variant. */
3033 if (TREE_CODE (arg0
) != TREE_CODE (arg1
)
3034 && COMPARISON_CLASS_P (arg0
)
3035 && COMPARISON_CLASS_P (arg1
))
3037 enum tree_code swap_code
= swap_tree_comparison (TREE_CODE (arg1
));
3039 if (TREE_CODE (arg0
) == swap_code
)
3040 return operand_equal_p (TREE_OPERAND (arg0
, 0),
3041 TREE_OPERAND (arg1
, 1), flags
)
3042 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3043 TREE_OPERAND (arg1
, 0), flags
);
3046 if (TREE_CODE (arg0
) != TREE_CODE (arg1
))
3048 /* NOP_EXPR and CONVERT_EXPR are considered equal. */
3049 if (CONVERT_EXPR_P (arg0
) && CONVERT_EXPR_P (arg1
))
3051 else if (flags
& OEP_ADDRESS_OF
)
3053 /* If we are interested in comparing addresses ignore
3054 MEM_REF wrappings of the base that can appear just for
3056 if (TREE_CODE (arg0
) == MEM_REF
3058 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == ADDR_EXPR
3059 && TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0) == arg1
3060 && integer_zerop (TREE_OPERAND (arg0
, 1)))
3062 else if (TREE_CODE (arg1
) == MEM_REF
3064 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == ADDR_EXPR
3065 && TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0) == arg0
3066 && integer_zerop (TREE_OPERAND (arg1
, 1)))
3074 /* When not checking adddresses, this is needed for conversions and for
3075 COMPONENT_REF. Might as well play it safe and always test this. */
3076 if (TREE_CODE (TREE_TYPE (arg0
)) == ERROR_MARK
3077 || TREE_CODE (TREE_TYPE (arg1
)) == ERROR_MARK
3078 || (TYPE_MODE (TREE_TYPE (arg0
)) != TYPE_MODE (TREE_TYPE (arg1
))
3079 && !(flags
& OEP_ADDRESS_OF
)))
3082 /* If ARG0 and ARG1 are the same SAVE_EXPR, they are necessarily equal.
3083 We don't care about side effects in that case because the SAVE_EXPR
3084 takes care of that for us. In all other cases, two expressions are
3085 equal if they have no side effects. If we have two identical
3086 expressions with side effects that should be treated the same due
3087 to the only side effects being identical SAVE_EXPR's, that will
3088 be detected in the recursive calls below.
3089 If we are taking an invariant address of two identical objects
3090 they are necessarily equal as well. */
3091 if (arg0
== arg1
&& ! (flags
& OEP_ONLY_CONST
)
3092 && (TREE_CODE (arg0
) == SAVE_EXPR
3093 || (flags
& OEP_MATCH_SIDE_EFFECTS
)
3094 || (! TREE_SIDE_EFFECTS (arg0
) && ! TREE_SIDE_EFFECTS (arg1
))))
3097 /* Next handle constant cases, those for which we can return 1 even
3098 if ONLY_CONST is set. */
3099 if (TREE_CONSTANT (arg0
) && TREE_CONSTANT (arg1
))
3100 switch (TREE_CODE (arg0
))
3103 return tree_int_cst_equal (arg0
, arg1
);
3106 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (arg0
),
3107 TREE_FIXED_CST (arg1
));
3110 if (real_identical (&TREE_REAL_CST (arg0
), &TREE_REAL_CST (arg1
)))
3113 if (!(flags
& OEP_BITWISE
) && !HONOR_SIGNED_ZEROS (arg0
))
3115 /* If we do not distinguish between signed and unsigned zero,
3116 consider them equal. */
3117 if (real_zerop (arg0
) && real_zerop (arg1
))
3124 if (VECTOR_CST_LOG2_NPATTERNS (arg0
)
3125 != VECTOR_CST_LOG2_NPATTERNS (arg1
))
3128 if (VECTOR_CST_NELTS_PER_PATTERN (arg0
)
3129 != VECTOR_CST_NELTS_PER_PATTERN (arg1
))
3132 unsigned int count
= vector_cst_encoded_nelts (arg0
);
3133 for (unsigned int i
= 0; i
< count
; ++i
)
3134 if (!operand_equal_p (VECTOR_CST_ENCODED_ELT (arg0
, i
),
3135 VECTOR_CST_ENCODED_ELT (arg1
, i
), flags
))
3141 return (operand_equal_p (TREE_REALPART (arg0
), TREE_REALPART (arg1
),
3143 && operand_equal_p (TREE_IMAGPART (arg0
), TREE_IMAGPART (arg1
),
3147 return (TREE_STRING_LENGTH (arg0
) == TREE_STRING_LENGTH (arg1
)
3148 && ! memcmp (TREE_STRING_POINTER (arg0
),
3149 TREE_STRING_POINTER (arg1
),
3150 TREE_STRING_LENGTH (arg0
)));
3153 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3154 return operand_equal_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 0),
3155 flags
| OEP_ADDRESS_OF
3156 | OEP_MATCH_SIDE_EFFECTS
);
3158 /* In GIMPLE empty constructors are allowed in initializers of
3160 return !CONSTRUCTOR_NELTS (arg0
) && !CONSTRUCTOR_NELTS (arg1
);
3165 /* Don't handle more cases for OEP_BITWISE, since we can't guarantee that
3166 two instances of undefined behavior will give identical results. */
3167 if (flags
& (OEP_ONLY_CONST
| OEP_BITWISE
))
3170 /* Define macros to test an operand from arg0 and arg1 for equality and a
3171 variant that allows null and views null as being different from any
3172 non-null value. In the latter case, if either is null, the both
3173 must be; otherwise, do the normal comparison. */
3174 #define OP_SAME(N) operand_equal_p (TREE_OPERAND (arg0, N), \
3175 TREE_OPERAND (arg1, N), flags)
3177 #define OP_SAME_WITH_NULL(N) \
3178 ((!TREE_OPERAND (arg0, N) || !TREE_OPERAND (arg1, N)) \
3179 ? TREE_OPERAND (arg0, N) == TREE_OPERAND (arg1, N) : OP_SAME (N))
3181 switch (TREE_CODE_CLASS (TREE_CODE (arg0
)))
3184 /* Two conversions are equal only if signedness and modes match. */
3185 switch (TREE_CODE (arg0
))
3188 case FIX_TRUNC_EXPR
:
3189 if (TYPE_UNSIGNED (TREE_TYPE (arg0
))
3190 != TYPE_UNSIGNED (TREE_TYPE (arg1
)))
3200 case tcc_comparison
:
3202 if (OP_SAME (0) && OP_SAME (1))
3205 /* For commutative ops, allow the other order. */
3206 return (commutative_tree_code (TREE_CODE (arg0
))
3207 && operand_equal_p (TREE_OPERAND (arg0
, 0),
3208 TREE_OPERAND (arg1
, 1), flags
)
3209 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3210 TREE_OPERAND (arg1
, 0), flags
));
3213 /* If either of the pointer (or reference) expressions we are
3214 dereferencing contain a side effect, these cannot be equal,
3215 but their addresses can be. */
3216 if ((flags
& OEP_MATCH_SIDE_EFFECTS
) == 0
3217 && (TREE_SIDE_EFFECTS (arg0
)
3218 || TREE_SIDE_EFFECTS (arg1
)))
3221 switch (TREE_CODE (arg0
))
3224 if (!(flags
& OEP_ADDRESS_OF
))
3226 if (TYPE_ALIGN (TREE_TYPE (arg0
))
3227 != TYPE_ALIGN (TREE_TYPE (arg1
)))
3229 /* Verify that the access types are compatible. */
3230 if (TYPE_MAIN_VARIANT (TREE_TYPE (arg0
))
3231 != TYPE_MAIN_VARIANT (TREE_TYPE (arg1
)))
3234 flags
&= ~OEP_ADDRESS_OF
;
3238 /* Require the same offset. */
3239 if (!operand_equal_p (TYPE_SIZE (TREE_TYPE (arg0
)),
3240 TYPE_SIZE (TREE_TYPE (arg1
)),
3241 flags
& ~OEP_ADDRESS_OF
))
3246 case VIEW_CONVERT_EXPR
:
3249 case TARGET_MEM_REF
:
3251 if (!(flags
& OEP_ADDRESS_OF
))
3253 /* Require equal access sizes */
3254 if (TYPE_SIZE (TREE_TYPE (arg0
)) != TYPE_SIZE (TREE_TYPE (arg1
))
3255 && (!TYPE_SIZE (TREE_TYPE (arg0
))
3256 || !TYPE_SIZE (TREE_TYPE (arg1
))
3257 || !operand_equal_p (TYPE_SIZE (TREE_TYPE (arg0
)),
3258 TYPE_SIZE (TREE_TYPE (arg1
)),
3261 /* Verify that access happens in similar types. */
3262 if (!types_compatible_p (TREE_TYPE (arg0
), TREE_TYPE (arg1
)))
3264 /* Verify that accesses are TBAA compatible. */
3265 if (!alias_ptr_types_compatible_p
3266 (TREE_TYPE (TREE_OPERAND (arg0
, 1)),
3267 TREE_TYPE (TREE_OPERAND (arg1
, 1)))
3268 || (MR_DEPENDENCE_CLIQUE (arg0
)
3269 != MR_DEPENDENCE_CLIQUE (arg1
))
3270 || (MR_DEPENDENCE_BASE (arg0
)
3271 != MR_DEPENDENCE_BASE (arg1
)))
3273 /* Verify that alignment is compatible. */
3274 if (TYPE_ALIGN (TREE_TYPE (arg0
))
3275 != TYPE_ALIGN (TREE_TYPE (arg1
)))
3278 flags
&= ~OEP_ADDRESS_OF
;
3279 return (OP_SAME (0) && OP_SAME (1)
3280 /* TARGET_MEM_REF require equal extra operands. */
3281 && (TREE_CODE (arg0
) != TARGET_MEM_REF
3282 || (OP_SAME_WITH_NULL (2)
3283 && OP_SAME_WITH_NULL (3)
3284 && OP_SAME_WITH_NULL (4))));
3287 case ARRAY_RANGE_REF
:
3290 flags
&= ~OEP_ADDRESS_OF
;
3291 /* Compare the array index by value if it is constant first as we
3292 may have different types but same value here. */
3293 return ((tree_int_cst_equal (TREE_OPERAND (arg0
, 1),
3294 TREE_OPERAND (arg1
, 1))
3296 && OP_SAME_WITH_NULL (2)
3297 && OP_SAME_WITH_NULL (3)
3298 /* Compare low bound and element size as with OEP_ADDRESS_OF
3299 we have to account for the offset of the ref. */
3300 && (TREE_TYPE (TREE_OPERAND (arg0
, 0))
3301 == TREE_TYPE (TREE_OPERAND (arg1
, 0))
3302 || (operand_equal_p (array_ref_low_bound
3303 (CONST_CAST_TREE (arg0
)),
3305 (CONST_CAST_TREE (arg1
)), flags
)
3306 && operand_equal_p (array_ref_element_size
3307 (CONST_CAST_TREE (arg0
)),
3308 array_ref_element_size
3309 (CONST_CAST_TREE (arg1
)),
3313 /* Handle operand 2 the same as for ARRAY_REF. Operand 0
3314 may be NULL when we're called to compare MEM_EXPRs. */
3315 if (!OP_SAME_WITH_NULL (0)
3318 flags
&= ~OEP_ADDRESS_OF
;
3319 return OP_SAME_WITH_NULL (2);
3324 flags
&= ~OEP_ADDRESS_OF
;
3325 return OP_SAME (1) && OP_SAME (2);
3327 /* Virtual table call. */
3330 if (!operand_equal_p (OBJ_TYPE_REF_EXPR (arg0
),
3331 OBJ_TYPE_REF_EXPR (arg1
), flags
))
3333 if (tree_to_uhwi (OBJ_TYPE_REF_TOKEN (arg0
))
3334 != tree_to_uhwi (OBJ_TYPE_REF_TOKEN (arg1
)))
3336 if (!operand_equal_p (OBJ_TYPE_REF_OBJECT (arg0
),
3337 OBJ_TYPE_REF_OBJECT (arg1
), flags
))
3339 if (!types_same_for_odr (obj_type_ref_class (arg0
),
3340 obj_type_ref_class (arg1
)))
3349 case tcc_expression
:
3350 switch (TREE_CODE (arg0
))
3353 /* Be sure we pass right ADDRESS_OF flag. */
3354 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3355 return operand_equal_p (TREE_OPERAND (arg0
, 0),
3356 TREE_OPERAND (arg1
, 0),
3357 flags
| OEP_ADDRESS_OF
);
3359 case TRUTH_NOT_EXPR
:
3362 case TRUTH_ANDIF_EXPR
:
3363 case TRUTH_ORIF_EXPR
:
3364 return OP_SAME (0) && OP_SAME (1);
3366 case WIDEN_MULT_PLUS_EXPR
:
3367 case WIDEN_MULT_MINUS_EXPR
:
3370 /* The multiplcation operands are commutative. */
3373 case TRUTH_AND_EXPR
:
3375 case TRUTH_XOR_EXPR
:
3376 if (OP_SAME (0) && OP_SAME (1))
3379 /* Otherwise take into account this is a commutative operation. */
3380 return (operand_equal_p (TREE_OPERAND (arg0
, 0),
3381 TREE_OPERAND (arg1
, 1), flags
)
3382 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3383 TREE_OPERAND (arg1
, 0), flags
));
3386 if (! OP_SAME (1) || ! OP_SAME_WITH_NULL (2))
3388 flags
&= ~OEP_ADDRESS_OF
;
3391 case BIT_INSERT_EXPR
:
3392 /* BIT_INSERT_EXPR has an implict operand as the type precision
3393 of op1. Need to check to make sure they are the same. */
3394 if (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
3395 && TREE_CODE (TREE_OPERAND (arg1
, 1)) == INTEGER_CST
3396 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg0
, 1)))
3397 != TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg1
, 1))))
3403 return OP_SAME (0) && OP_SAME (1) && OP_SAME (2);
3408 case PREDECREMENT_EXPR
:
3409 case PREINCREMENT_EXPR
:
3410 case POSTDECREMENT_EXPR
:
3411 case POSTINCREMENT_EXPR
:
3412 if (flags
& OEP_LEXICOGRAPHIC
)
3413 return OP_SAME (0) && OP_SAME (1);
3416 case CLEANUP_POINT_EXPR
:
3419 if (flags
& OEP_LEXICOGRAPHIC
)
3428 switch (TREE_CODE (arg0
))
3431 if ((CALL_EXPR_FN (arg0
) == NULL_TREE
)
3432 != (CALL_EXPR_FN (arg1
) == NULL_TREE
))
3433 /* If not both CALL_EXPRs are either internal or normal function
3434 functions, then they are not equal. */
3436 else if (CALL_EXPR_FN (arg0
) == NULL_TREE
)
3438 /* If the CALL_EXPRs call different internal functions, then they
3440 if (CALL_EXPR_IFN (arg0
) != CALL_EXPR_IFN (arg1
))
3445 /* If the CALL_EXPRs call different functions, then they are not
3447 if (! operand_equal_p (CALL_EXPR_FN (arg0
), CALL_EXPR_FN (arg1
),
3452 /* FIXME: We could skip this test for OEP_MATCH_SIDE_EFFECTS. */
3454 unsigned int cef
= call_expr_flags (arg0
);
3455 if (flags
& OEP_PURE_SAME
)
3456 cef
&= ECF_CONST
| ECF_PURE
;
3459 if (!cef
&& !(flags
& OEP_LEXICOGRAPHIC
))
3463 /* Now see if all the arguments are the same. */
3465 const_call_expr_arg_iterator iter0
, iter1
;
3467 for (a0
= first_const_call_expr_arg (arg0
, &iter0
),
3468 a1
= first_const_call_expr_arg (arg1
, &iter1
);
3470 a0
= next_const_call_expr_arg (&iter0
),
3471 a1
= next_const_call_expr_arg (&iter1
))
3472 if (! operand_equal_p (a0
, a1
, flags
))
3475 /* If we get here and both argument lists are exhausted
3476 then the CALL_EXPRs are equal. */
3477 return ! (a0
|| a1
);
3483 case tcc_declaration
:
3484 /* Consider __builtin_sqrt equal to sqrt. */
3485 return (TREE_CODE (arg0
) == FUNCTION_DECL
3486 && fndecl_built_in_p (arg0
) && fndecl_built_in_p (arg1
)
3487 && DECL_BUILT_IN_CLASS (arg0
) == DECL_BUILT_IN_CLASS (arg1
)
3488 && (DECL_UNCHECKED_FUNCTION_CODE (arg0
)
3489 == DECL_UNCHECKED_FUNCTION_CODE (arg1
)));
3491 case tcc_exceptional
:
3492 if (TREE_CODE (arg0
) == CONSTRUCTOR
)
3494 if (CONSTRUCTOR_NO_CLEARING (arg0
) != CONSTRUCTOR_NO_CLEARING (arg1
))
3497 /* In GIMPLE constructors are used only to build vectors from
3498 elements. Individual elements in the constructor must be
3499 indexed in increasing order and form an initial sequence.
3501 We make no effort to compare constructors in generic.
3502 (see sem_variable::equals in ipa-icf which can do so for
3504 if (!VECTOR_TYPE_P (TREE_TYPE (arg0
))
3505 || !VECTOR_TYPE_P (TREE_TYPE (arg1
)))
3508 /* Be sure that vectors constructed have the same representation.
3509 We only tested element precision and modes to match.
3510 Vectors may be BLKmode and thus also check that the number of
3512 if (maybe_ne (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)),
3513 TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
))))
3516 vec
<constructor_elt
, va_gc
> *v0
= CONSTRUCTOR_ELTS (arg0
);
3517 vec
<constructor_elt
, va_gc
> *v1
= CONSTRUCTOR_ELTS (arg1
);
3518 unsigned int len
= vec_safe_length (v0
);
3520 if (len
!= vec_safe_length (v1
))
3523 for (unsigned int i
= 0; i
< len
; i
++)
3525 constructor_elt
*c0
= &(*v0
)[i
];
3526 constructor_elt
*c1
= &(*v1
)[i
];
3528 if (!operand_equal_p (c0
->value
, c1
->value
, flags
)
3529 /* In GIMPLE the indexes can be either NULL or matching i.
3530 Double check this so we won't get false
3531 positives for GENERIC. */
3533 && (TREE_CODE (c0
->index
) != INTEGER_CST
3534 || compare_tree_int (c0
->index
, i
)))
3536 && (TREE_CODE (c1
->index
) != INTEGER_CST
3537 || compare_tree_int (c1
->index
, i
))))
3542 else if (TREE_CODE (arg0
) == STATEMENT_LIST
3543 && (flags
& OEP_LEXICOGRAPHIC
))
3545 /* Compare the STATEMENT_LISTs. */
3546 tree_stmt_iterator tsi1
, tsi2
;
3547 tree body1
= CONST_CAST_TREE (arg0
);
3548 tree body2
= CONST_CAST_TREE (arg1
);
3549 for (tsi1
= tsi_start (body1
), tsi2
= tsi_start (body2
); ;
3550 tsi_next (&tsi1
), tsi_next (&tsi2
))
3552 /* The lists don't have the same number of statements. */
3553 if (tsi_end_p (tsi1
) ^ tsi_end_p (tsi2
))
3555 if (tsi_end_p (tsi1
) && tsi_end_p (tsi2
))
3557 if (!operand_equal_p (tsi_stmt (tsi1
), tsi_stmt (tsi2
),
3558 flags
& (OEP_LEXICOGRAPHIC
3559 | OEP_NO_HASH_CHECK
)))
3566 switch (TREE_CODE (arg0
))
3569 if (flags
& OEP_LEXICOGRAPHIC
)
3570 return OP_SAME_WITH_NULL (0);
3572 case DEBUG_BEGIN_STMT
:
3573 if (flags
& OEP_LEXICOGRAPHIC
)
3585 #undef OP_SAME_WITH_NULL
3588 /* Generate a hash value for an expression. This can be used iteratively
3589 by passing a previous result as the HSTATE argument. */
3592 operand_compare::hash_operand (const_tree t
, inchash::hash
&hstate
,
3596 enum tree_code code
;
3597 enum tree_code_class tclass
;
3599 if (t
== NULL_TREE
|| t
== error_mark_node
)
3601 hstate
.merge_hash (0);
3605 STRIP_ANY_LOCATION_WRAPPER (t
);
3607 if (!(flags
& OEP_ADDRESS_OF
))
3610 code
= TREE_CODE (t
);
3614 /* Alas, constants aren't shared, so we can't rely on pointer
3617 hstate
.merge_hash (0);
3620 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3621 for (i
= 0; i
< TREE_INT_CST_EXT_NUNITS (t
); i
++)
3622 hstate
.add_hwi (TREE_INT_CST_ELT (t
, i
));
3627 if (!HONOR_SIGNED_ZEROS (t
) && real_zerop (t
))
3630 val2
= real_hash (TREE_REAL_CST_PTR (t
));
3631 hstate
.merge_hash (val2
);
3636 unsigned int val2
= fixed_hash (TREE_FIXED_CST_PTR (t
));
3637 hstate
.merge_hash (val2
);
3641 hstate
.add ((const void *) TREE_STRING_POINTER (t
),
3642 TREE_STRING_LENGTH (t
));
3645 hash_operand (TREE_REALPART (t
), hstate
, flags
);
3646 hash_operand (TREE_IMAGPART (t
), hstate
, flags
);
3650 hstate
.add_int (VECTOR_CST_NPATTERNS (t
));
3651 hstate
.add_int (VECTOR_CST_NELTS_PER_PATTERN (t
));
3652 unsigned int count
= vector_cst_encoded_nelts (t
);
3653 for (unsigned int i
= 0; i
< count
; ++i
)
3654 hash_operand (VECTOR_CST_ENCODED_ELT (t
, i
), hstate
, flags
);
3658 /* We can just compare by pointer. */
3659 hstate
.add_hwi (SSA_NAME_VERSION (t
));
3661 case PLACEHOLDER_EXPR
:
3662 /* The node itself doesn't matter. */
3669 /* A list of expressions, for a CALL_EXPR or as the elements of a
3671 for (; t
; t
= TREE_CHAIN (t
))
3672 hash_operand (TREE_VALUE (t
), hstate
, flags
);
3676 unsigned HOST_WIDE_INT idx
;
3678 flags
&= ~OEP_ADDRESS_OF
;
3679 hstate
.add_int (CONSTRUCTOR_NO_CLEARING (t
));
3680 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t
), idx
, field
, value
)
3682 /* In GIMPLE the indexes can be either NULL or matching i. */
3683 if (field
== NULL_TREE
)
3684 field
= bitsize_int (idx
);
3685 hash_operand (field
, hstate
, flags
);
3686 hash_operand (value
, hstate
, flags
);
3690 case STATEMENT_LIST
:
3692 tree_stmt_iterator i
;
3693 for (i
= tsi_start (CONST_CAST_TREE (t
));
3694 !tsi_end_p (i
); tsi_next (&i
))
3695 hash_operand (tsi_stmt (i
), hstate
, flags
);
3699 for (i
= 0; i
< TREE_VEC_LENGTH (t
); ++i
)
3700 hash_operand (TREE_VEC_ELT (t
, i
), hstate
, flags
);
3702 case IDENTIFIER_NODE
:
3703 hstate
.add_object (IDENTIFIER_HASH_VALUE (t
));
3706 /* When referring to a built-in FUNCTION_DECL, use the __builtin__ form.
3707 Otherwise nodes that compare equal according to operand_equal_p might
3708 get different hash codes. However, don't do this for machine specific
3709 or front end builtins, since the function code is overloaded in those
3711 if (DECL_BUILT_IN_CLASS (t
) == BUILT_IN_NORMAL
3712 && builtin_decl_explicit_p (DECL_FUNCTION_CODE (t
)))
3714 t
= builtin_decl_explicit (DECL_FUNCTION_CODE (t
));
3715 code
= TREE_CODE (t
);
3719 if (POLY_INT_CST_P (t
))
3721 for (unsigned int i
= 0; i
< NUM_POLY_INT_COEFFS
; ++i
)
3722 hstate
.add_wide_int (wi::to_wide (POLY_INT_CST_COEFF (t
, i
)));
3725 tclass
= TREE_CODE_CLASS (code
);
3727 if (tclass
== tcc_declaration
)
3729 /* DECL's have a unique ID */
3730 hstate
.add_hwi (DECL_UID (t
));
3732 else if (tclass
== tcc_comparison
&& !commutative_tree_code (code
))
3734 /* For comparisons that can be swapped, use the lower
3736 enum tree_code ccode
= swap_tree_comparison (code
);
3739 hstate
.add_object (ccode
);
3740 hash_operand (TREE_OPERAND (t
, ccode
!= code
), hstate
, flags
);
3741 hash_operand (TREE_OPERAND (t
, ccode
== code
), hstate
, flags
);
3743 else if (CONVERT_EXPR_CODE_P (code
))
3745 /* NOP_EXPR and CONVERT_EXPR are considered equal by
3747 enum tree_code ccode
= NOP_EXPR
;
3748 hstate
.add_object (ccode
);
3750 /* Don't hash the type, that can lead to having nodes which
3751 compare equal according to operand_equal_p, but which
3752 have different hash codes. Make sure to include signedness
3753 in the hash computation. */
3754 hstate
.add_int (TYPE_UNSIGNED (TREE_TYPE (t
)));
3755 hash_operand (TREE_OPERAND (t
, 0), hstate
, flags
);
3757 /* For OEP_ADDRESS_OF, hash MEM_EXPR[&decl, 0] the same as decl. */
3758 else if (code
== MEM_REF
3759 && (flags
& OEP_ADDRESS_OF
) != 0
3760 && TREE_CODE (TREE_OPERAND (t
, 0)) == ADDR_EXPR
3761 && DECL_P (TREE_OPERAND (TREE_OPERAND (t
, 0), 0))
3762 && integer_zerop (TREE_OPERAND (t
, 1)))
3763 hash_operand (TREE_OPERAND (TREE_OPERAND (t
, 0), 0),
3765 /* Don't ICE on FE specific trees, or their arguments etc.
3766 during operand_equal_p hash verification. */
3767 else if (!IS_EXPR_CODE_CLASS (tclass
))
3768 gcc_assert (flags
& OEP_HASH_CHECK
);
3771 unsigned int sflags
= flags
;
3773 hstate
.add_object (code
);
3778 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3779 flags
|= OEP_ADDRESS_OF
;
3785 case TARGET_MEM_REF
:
3786 flags
&= ~OEP_ADDRESS_OF
;
3791 case ARRAY_RANGE_REF
:
3794 sflags
&= ~OEP_ADDRESS_OF
;
3798 flags
&= ~OEP_ADDRESS_OF
;
3801 case WIDEN_MULT_PLUS_EXPR
:
3802 case WIDEN_MULT_MINUS_EXPR
:
3804 /* The multiplication operands are commutative. */
3805 inchash::hash one
, two
;
3806 hash_operand (TREE_OPERAND (t
, 0), one
, flags
);
3807 hash_operand (TREE_OPERAND (t
, 1), two
, flags
);
3808 hstate
.add_commutative (one
, two
);
3809 hash_operand (TREE_OPERAND (t
, 2), two
, flags
);
3814 if (CALL_EXPR_FN (t
) == NULL_TREE
)
3815 hstate
.add_int (CALL_EXPR_IFN (t
));
3819 /* For TARGET_EXPR, just hash on the TARGET_EXPR_SLOT.
3820 Usually different TARGET_EXPRs just should use
3821 different temporaries in their slots. */
3822 hash_operand (TARGET_EXPR_SLOT (t
), hstate
, flags
);
3825 /* Virtual table call. */
3827 inchash::add_expr (OBJ_TYPE_REF_EXPR (t
), hstate
, flags
);
3828 inchash::add_expr (OBJ_TYPE_REF_TOKEN (t
), hstate
, flags
);
3829 inchash::add_expr (OBJ_TYPE_REF_OBJECT (t
), hstate
, flags
);
3835 /* Don't hash the type, that can lead to having nodes which
3836 compare equal according to operand_equal_p, but which
3837 have different hash codes. */
3838 if (code
== NON_LVALUE_EXPR
)
3840 /* Make sure to include signness in the hash computation. */
3841 hstate
.add_int (TYPE_UNSIGNED (TREE_TYPE (t
)));
3842 hash_operand (TREE_OPERAND (t
, 0), hstate
, flags
);
3845 else if (commutative_tree_code (code
))
3847 /* It's a commutative expression. We want to hash it the same
3848 however it appears. We do this by first hashing both operands
3849 and then rehashing based on the order of their independent
3851 inchash::hash one
, two
;
3852 hash_operand (TREE_OPERAND (t
, 0), one
, flags
);
3853 hash_operand (TREE_OPERAND (t
, 1), two
, flags
);
3854 hstate
.add_commutative (one
, two
);
3857 for (i
= TREE_OPERAND_LENGTH (t
) - 1; i
>= 0; --i
)
3858 hash_operand (TREE_OPERAND (t
, i
), hstate
,
3859 i
== 0 ? flags
: sflags
);
3866 operand_compare::verify_hash_value (const_tree arg0
, const_tree arg1
,
3867 unsigned int flags
, bool *ret
)
3869 /* When checking, verify at the outermost operand_equal_p call that
3870 if operand_equal_p returns non-zero then ARG0 and ARG1 has the same
3872 if (flag_checking
&& !(flags
& OEP_NO_HASH_CHECK
))
3874 if (operand_equal_p (arg0
, arg1
, flags
| OEP_NO_HASH_CHECK
))
3878 inchash::hash
hstate0 (0), hstate1 (0);
3879 hash_operand (arg0
, hstate0
, flags
| OEP_HASH_CHECK
);
3880 hash_operand (arg1
, hstate1
, flags
| OEP_HASH_CHECK
);
3881 hashval_t h0
= hstate0
.end ();
3882 hashval_t h1
= hstate1
.end ();
3883 gcc_assert (h0
== h1
);
3897 static operand_compare default_compare_instance
;
3899 /* Conveinece wrapper around operand_compare class because usually we do
3900 not need to play with the valueizer. */
3903 operand_equal_p (const_tree arg0
, const_tree arg1
, unsigned int flags
)
3905 return default_compare_instance
.operand_equal_p (arg0
, arg1
, flags
);
3911 /* Generate a hash value for an expression. This can be used iteratively
3912 by passing a previous result as the HSTATE argument.
3914 This function is intended to produce the same hash for expressions which
3915 would compare equal using operand_equal_p. */
3917 add_expr (const_tree t
, inchash::hash
&hstate
, unsigned int flags
)
3919 default_compare_instance
.hash_operand (t
, hstate
, flags
);
3924 /* Similar to operand_equal_p, but see if ARG0 might be a variant of ARG1
3925 with a different signedness or a narrower precision. */
3928 operand_equal_for_comparison_p (tree arg0
, tree arg1
)
3930 if (operand_equal_p (arg0
, arg1
, 0))
3933 if (! INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
3934 || ! INTEGRAL_TYPE_P (TREE_TYPE (arg1
)))
3937 /* Discard any conversions that don't change the modes of ARG0 and ARG1
3938 and see if the inner values are the same. This removes any
3939 signedness comparison, which doesn't matter here. */
3944 if (operand_equal_p (op0
, op1
, 0))
3947 /* Discard a single widening conversion from ARG1 and see if the inner
3948 value is the same as ARG0. */
3949 if (CONVERT_EXPR_P (arg1
)
3950 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
3951 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
3952 < TYPE_PRECISION (TREE_TYPE (arg1
))
3953 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
3959 /* See if ARG is an expression that is either a comparison or is performing
3960 arithmetic on comparisons. The comparisons must only be comparing
3961 two different values, which will be stored in *CVAL1 and *CVAL2; if
3962 they are nonzero it means that some operands have already been found.
3963 No variables may be used anywhere else in the expression except in the
3966 If this is true, return 1. Otherwise, return zero. */
3969 twoval_comparison_p (tree arg
, tree
*cval1
, tree
*cval2
)
3971 enum tree_code code
= TREE_CODE (arg
);
3972 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
3974 /* We can handle some of the tcc_expression cases here. */
3975 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
3977 else if (tclass
== tcc_expression
3978 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
3979 || code
== COMPOUND_EXPR
))
3980 tclass
= tcc_binary
;
3985 return twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
);
3988 return (twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
)
3989 && twoval_comparison_p (TREE_OPERAND (arg
, 1), cval1
, cval2
));
3994 case tcc_expression
:
3995 if (code
== COND_EXPR
)
3996 return (twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
)
3997 && twoval_comparison_p (TREE_OPERAND (arg
, 1), cval1
, cval2
)
3998 && twoval_comparison_p (TREE_OPERAND (arg
, 2), cval1
, cval2
));
4001 case tcc_comparison
:
4002 /* First see if we can handle the first operand, then the second. For
4003 the second operand, we know *CVAL1 can't be zero. It must be that
4004 one side of the comparison is each of the values; test for the
4005 case where this isn't true by failing if the two operands
4008 if (operand_equal_p (TREE_OPERAND (arg
, 0),
4009 TREE_OPERAND (arg
, 1), 0))
4013 *cval1
= TREE_OPERAND (arg
, 0);
4014 else if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 0), 0))
4016 else if (*cval2
== 0)
4017 *cval2
= TREE_OPERAND (arg
, 0);
4018 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 0), 0))
4023 if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 1), 0))
4025 else if (*cval2
== 0)
4026 *cval2
= TREE_OPERAND (arg
, 1);
4027 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 1), 0))
4039 /* ARG is a tree that is known to contain just arithmetic operations and
4040 comparisons. Evaluate the operations in the tree substituting NEW0 for
4041 any occurrence of OLD0 as an operand of a comparison and likewise for
4045 eval_subst (location_t loc
, tree arg
, tree old0
, tree new0
,
4046 tree old1
, tree new1
)
4048 tree type
= TREE_TYPE (arg
);
4049 enum tree_code code
= TREE_CODE (arg
);
4050 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
4052 /* We can handle some of the tcc_expression cases here. */
4053 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
4055 else if (tclass
== tcc_expression
4056 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
4057 tclass
= tcc_binary
;
4062 return fold_build1_loc (loc
, code
, type
,
4063 eval_subst (loc
, TREE_OPERAND (arg
, 0),
4064 old0
, new0
, old1
, new1
));
4067 return fold_build2_loc (loc
, code
, type
,
4068 eval_subst (loc
, TREE_OPERAND (arg
, 0),
4069 old0
, new0
, old1
, new1
),
4070 eval_subst (loc
, TREE_OPERAND (arg
, 1),
4071 old0
, new0
, old1
, new1
));
4073 case tcc_expression
:
4077 return eval_subst (loc
, TREE_OPERAND (arg
, 0), old0
, new0
,
4081 return eval_subst (loc
, TREE_OPERAND (arg
, 1), old0
, new0
,
4085 return fold_build3_loc (loc
, code
, type
,
4086 eval_subst (loc
, TREE_OPERAND (arg
, 0),
4087 old0
, new0
, old1
, new1
),
4088 eval_subst (loc
, TREE_OPERAND (arg
, 1),
4089 old0
, new0
, old1
, new1
),
4090 eval_subst (loc
, TREE_OPERAND (arg
, 2),
4091 old0
, new0
, old1
, new1
));
4095 /* Fall through - ??? */
4097 case tcc_comparison
:
4099 tree arg0
= TREE_OPERAND (arg
, 0);
4100 tree arg1
= TREE_OPERAND (arg
, 1);
4102 /* We need to check both for exact equality and tree equality. The
4103 former will be true if the operand has a side-effect. In that
4104 case, we know the operand occurred exactly once. */
4106 if (arg0
== old0
|| operand_equal_p (arg0
, old0
, 0))
4108 else if (arg0
== old1
|| operand_equal_p (arg0
, old1
, 0))
4111 if (arg1
== old0
|| operand_equal_p (arg1
, old0
, 0))
4113 else if (arg1
== old1
|| operand_equal_p (arg1
, old1
, 0))
4116 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
4124 /* Return a tree for the case when the result of an expression is RESULT
4125 converted to TYPE and OMITTED was previously an operand of the expression
4126 but is now not needed (e.g., we folded OMITTED * 0).
4128 If OMITTED has side effects, we must evaluate it. Otherwise, just do
4129 the conversion of RESULT to TYPE. */
4132 omit_one_operand_loc (location_t loc
, tree type
, tree result
, tree omitted
)
4134 tree t
= fold_convert_loc (loc
, type
, result
);
4136 /* If the resulting operand is an empty statement, just return the omitted
4137 statement casted to void. */
4138 if (IS_EMPTY_STMT (t
) && TREE_SIDE_EFFECTS (omitted
))
4139 return build1_loc (loc
, NOP_EXPR
, void_type_node
,
4140 fold_ignored_result (omitted
));
4142 if (TREE_SIDE_EFFECTS (omitted
))
4143 return build2_loc (loc
, COMPOUND_EXPR
, type
,
4144 fold_ignored_result (omitted
), t
);
4146 return non_lvalue_loc (loc
, t
);
4149 /* Return a tree for the case when the result of an expression is RESULT
4150 converted to TYPE and OMITTED1 and OMITTED2 were previously operands
4151 of the expression but are now not needed.
4153 If OMITTED1 or OMITTED2 has side effects, they must be evaluated.
4154 If both OMITTED1 and OMITTED2 have side effects, OMITTED1 is
4155 evaluated before OMITTED2. Otherwise, if neither has side effects,
4156 just do the conversion of RESULT to TYPE. */
4159 omit_two_operands_loc (location_t loc
, tree type
, tree result
,
4160 tree omitted1
, tree omitted2
)
4162 tree t
= fold_convert_loc (loc
, type
, result
);
4164 if (TREE_SIDE_EFFECTS (omitted2
))
4165 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted2
, t
);
4166 if (TREE_SIDE_EFFECTS (omitted1
))
4167 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted1
, t
);
4169 return TREE_CODE (t
) != COMPOUND_EXPR
? non_lvalue_loc (loc
, t
) : t
;
4173 /* Return a simplified tree node for the truth-negation of ARG. This
4174 never alters ARG itself. We assume that ARG is an operation that
4175 returns a truth value (0 or 1).
4177 FIXME: one would think we would fold the result, but it causes
4178 problems with the dominator optimizer. */
4181 fold_truth_not_expr (location_t loc
, tree arg
)
4183 tree type
= TREE_TYPE (arg
);
4184 enum tree_code code
= TREE_CODE (arg
);
4185 location_t loc1
, loc2
;
4187 /* If this is a comparison, we can simply invert it, except for
4188 floating-point non-equality comparisons, in which case we just
4189 enclose a TRUTH_NOT_EXPR around what we have. */
4191 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
4193 tree op_type
= TREE_TYPE (TREE_OPERAND (arg
, 0));
4194 if (FLOAT_TYPE_P (op_type
)
4195 && flag_trapping_math
4196 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
4197 && code
!= NE_EXPR
&& code
!= EQ_EXPR
)
4200 code
= invert_tree_comparison (code
, HONOR_NANS (op_type
));
4201 if (code
== ERROR_MARK
)
4204 tree ret
= build2_loc (loc
, code
, type
, TREE_OPERAND (arg
, 0),
4205 TREE_OPERAND (arg
, 1));
4206 if (TREE_NO_WARNING (arg
))
4207 TREE_NO_WARNING (ret
) = 1;
4214 return constant_boolean_node (integer_zerop (arg
), type
);
4216 case TRUTH_AND_EXPR
:
4217 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4218 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4219 return build2_loc (loc
, TRUTH_OR_EXPR
, type
,
4220 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4221 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4224 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4225 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4226 return build2_loc (loc
, TRUTH_AND_EXPR
, type
,
4227 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4228 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4230 case TRUTH_XOR_EXPR
:
4231 /* Here we can invert either operand. We invert the first operand
4232 unless the second operand is a TRUTH_NOT_EXPR in which case our
4233 result is the XOR of the first operand with the inside of the
4234 negation of the second operand. */
4236 if (TREE_CODE (TREE_OPERAND (arg
, 1)) == TRUTH_NOT_EXPR
)
4237 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
, TREE_OPERAND (arg
, 0),
4238 TREE_OPERAND (TREE_OPERAND (arg
, 1), 0));
4240 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
,
4241 invert_truthvalue_loc (loc
, TREE_OPERAND (arg
, 0)),
4242 TREE_OPERAND (arg
, 1));
4244 case TRUTH_ANDIF_EXPR
:
4245 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4246 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4247 return build2_loc (loc
, TRUTH_ORIF_EXPR
, type
,
4248 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4249 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4251 case TRUTH_ORIF_EXPR
:
4252 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4253 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4254 return build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
4255 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4256 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4258 case TRUTH_NOT_EXPR
:
4259 return TREE_OPERAND (arg
, 0);
4263 tree arg1
= TREE_OPERAND (arg
, 1);
4264 tree arg2
= TREE_OPERAND (arg
, 2);
4266 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4267 loc2
= expr_location_or (TREE_OPERAND (arg
, 2), loc
);
4269 /* A COND_EXPR may have a throw as one operand, which
4270 then has void type. Just leave void operands
4272 return build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg
, 0),
4273 VOID_TYPE_P (TREE_TYPE (arg1
))
4274 ? arg1
: invert_truthvalue_loc (loc1
, arg1
),
4275 VOID_TYPE_P (TREE_TYPE (arg2
))
4276 ? arg2
: invert_truthvalue_loc (loc2
, arg2
));
4280 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4281 return build2_loc (loc
, COMPOUND_EXPR
, type
,
4282 TREE_OPERAND (arg
, 0),
4283 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 1)));
4285 case NON_LVALUE_EXPR
:
4286 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4287 return invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0));
4290 if (TREE_CODE (TREE_TYPE (arg
)) == BOOLEAN_TYPE
)
4291 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
4296 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4297 return build1_loc (loc
, TREE_CODE (arg
), type
,
4298 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
4301 if (!integer_onep (TREE_OPERAND (arg
, 1)))
4303 return build2_loc (loc
, EQ_EXPR
, type
, arg
, build_int_cst (type
, 0));
4306 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
4308 case CLEANUP_POINT_EXPR
:
4309 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4310 return build1_loc (loc
, CLEANUP_POINT_EXPR
, type
,
4311 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
4318 /* Fold the truth-negation of ARG. This never alters ARG itself. We
4319 assume that ARG is an operation that returns a truth value (0 or 1
4320 for scalars, 0 or -1 for vectors). Return the folded expression if
4321 folding is successful. Otherwise, return NULL_TREE. */
4324 fold_invert_truthvalue (location_t loc
, tree arg
)
4326 tree type
= TREE_TYPE (arg
);
4327 return fold_unary_loc (loc
, VECTOR_TYPE_P (type
)
4333 /* Return a simplified tree node for the truth-negation of ARG. This
4334 never alters ARG itself. We assume that ARG is an operation that
4335 returns a truth value (0 or 1 for scalars, 0 or -1 for vectors). */
4338 invert_truthvalue_loc (location_t loc
, tree arg
)
4340 if (TREE_CODE (arg
) == ERROR_MARK
)
4343 tree type
= TREE_TYPE (arg
);
4344 return fold_build1_loc (loc
, VECTOR_TYPE_P (type
)
4350 /* Return a BIT_FIELD_REF of type TYPE to refer to BITSIZE bits of INNER
4351 starting at BITPOS. The field is unsigned if UNSIGNEDP is nonzero
4352 and uses reverse storage order if REVERSEP is nonzero. ORIG_INNER
4353 is the original memory reference used to preserve the alias set of
4357 make_bit_field_ref (location_t loc
, tree inner
, tree orig_inner
, tree type
,
4358 HOST_WIDE_INT bitsize
, poly_int64 bitpos
,
4359 int unsignedp
, int reversep
)
4361 tree result
, bftype
;
4363 /* Attempt not to lose the access path if possible. */
4364 if (TREE_CODE (orig_inner
) == COMPONENT_REF
)
4366 tree ninner
= TREE_OPERAND (orig_inner
, 0);
4368 poly_int64 nbitsize
, nbitpos
;
4370 int nunsignedp
, nreversep
, nvolatilep
= 0;
4371 tree base
= get_inner_reference (ninner
, &nbitsize
, &nbitpos
,
4372 &noffset
, &nmode
, &nunsignedp
,
4373 &nreversep
, &nvolatilep
);
4375 && noffset
== NULL_TREE
4376 && known_subrange_p (bitpos
, bitsize
, nbitpos
, nbitsize
)
4386 alias_set_type iset
= get_alias_set (orig_inner
);
4387 if (iset
== 0 && get_alias_set (inner
) != iset
)
4388 inner
= fold_build2 (MEM_REF
, TREE_TYPE (inner
),
4389 build_fold_addr_expr (inner
),
4390 build_int_cst (ptr_type_node
, 0));
4392 if (known_eq (bitpos
, 0) && !reversep
)
4394 tree size
= TYPE_SIZE (TREE_TYPE (inner
));
4395 if ((INTEGRAL_TYPE_P (TREE_TYPE (inner
))
4396 || POINTER_TYPE_P (TREE_TYPE (inner
)))
4397 && tree_fits_shwi_p (size
)
4398 && tree_to_shwi (size
) == bitsize
)
4399 return fold_convert_loc (loc
, type
, inner
);
4403 if (TYPE_PRECISION (bftype
) != bitsize
4404 || TYPE_UNSIGNED (bftype
) == !unsignedp
)
4405 bftype
= build_nonstandard_integer_type (bitsize
, 0);
4407 result
= build3_loc (loc
, BIT_FIELD_REF
, bftype
, inner
,
4408 bitsize_int (bitsize
), bitsize_int (bitpos
));
4409 REF_REVERSE_STORAGE_ORDER (result
) = reversep
;
4412 result
= fold_convert_loc (loc
, type
, result
);
4417 /* Optimize a bit-field compare.
4419 There are two cases: First is a compare against a constant and the
4420 second is a comparison of two items where the fields are at the same
4421 bit position relative to the start of a chunk (byte, halfword, word)
4422 large enough to contain it. In these cases we can avoid the shift
4423 implicit in bitfield extractions.
4425 For constants, we emit a compare of the shifted constant with the
4426 BIT_AND_EXPR of a mask and a byte, halfword, or word of the operand being
4427 compared. For two fields at the same position, we do the ANDs with the
4428 similar mask and compare the result of the ANDs.
4430 CODE is the comparison code, known to be either NE_EXPR or EQ_EXPR.
4431 COMPARE_TYPE is the type of the comparison, and LHS and RHS
4432 are the left and right operands of the comparison, respectively.
4434 If the optimization described above can be done, we return the resulting
4435 tree. Otherwise we return zero. */
4438 optimize_bit_field_compare (location_t loc
, enum tree_code code
,
4439 tree compare_type
, tree lhs
, tree rhs
)
4441 poly_int64 plbitpos
, plbitsize
, rbitpos
, rbitsize
;
4442 HOST_WIDE_INT lbitpos
, lbitsize
, nbitpos
, nbitsize
;
4443 tree type
= TREE_TYPE (lhs
);
4445 int const_p
= TREE_CODE (rhs
) == INTEGER_CST
;
4446 machine_mode lmode
, rmode
;
4447 scalar_int_mode nmode
;
4448 int lunsignedp
, runsignedp
;
4449 int lreversep
, rreversep
;
4450 int lvolatilep
= 0, rvolatilep
= 0;
4451 tree linner
, rinner
= NULL_TREE
;
4455 /* Get all the information about the extractions being done. If the bit size
4456 is the same as the size of the underlying object, we aren't doing an
4457 extraction at all and so can do nothing. We also don't want to
4458 do anything if the inner expression is a PLACEHOLDER_EXPR since we
4459 then will no longer be able to replace it. */
4460 linner
= get_inner_reference (lhs
, &plbitsize
, &plbitpos
, &offset
, &lmode
,
4461 &lunsignedp
, &lreversep
, &lvolatilep
);
4463 || !known_size_p (plbitsize
)
4464 || !plbitsize
.is_constant (&lbitsize
)
4465 || !plbitpos
.is_constant (&lbitpos
)
4466 || known_eq (lbitsize
, GET_MODE_BITSIZE (lmode
))
4468 || TREE_CODE (linner
) == PLACEHOLDER_EXPR
4473 rreversep
= lreversep
;
4476 /* If this is not a constant, we can only do something if bit positions,
4477 sizes, signedness and storage order are the same. */
4479 = get_inner_reference (rhs
, &rbitsize
, &rbitpos
, &offset
, &rmode
,
4480 &runsignedp
, &rreversep
, &rvolatilep
);
4483 || maybe_ne (lbitpos
, rbitpos
)
4484 || maybe_ne (lbitsize
, rbitsize
)
4485 || lunsignedp
!= runsignedp
4486 || lreversep
!= rreversep
4488 || TREE_CODE (rinner
) == PLACEHOLDER_EXPR
4493 /* Honor the C++ memory model and mimic what RTL expansion does. */
4494 poly_uint64 bitstart
= 0;
4495 poly_uint64 bitend
= 0;
4496 if (TREE_CODE (lhs
) == COMPONENT_REF
)
4498 get_bit_range (&bitstart
, &bitend
, lhs
, &plbitpos
, &offset
);
4499 if (!plbitpos
.is_constant (&lbitpos
) || offset
!= NULL_TREE
)
4503 /* See if we can find a mode to refer to this field. We should be able to,
4504 but fail if we can't. */
4505 if (!get_best_mode (lbitsize
, lbitpos
, bitstart
, bitend
,
4506 const_p
? TYPE_ALIGN (TREE_TYPE (linner
))
4507 : MIN (TYPE_ALIGN (TREE_TYPE (linner
)),
4508 TYPE_ALIGN (TREE_TYPE (rinner
))),
4509 BITS_PER_WORD
, false, &nmode
))
4512 /* Set signed and unsigned types of the precision of this mode for the
4514 unsigned_type
= lang_hooks
.types
.type_for_mode (nmode
, 1);
4516 /* Compute the bit position and size for the new reference and our offset
4517 within it. If the new reference is the same size as the original, we
4518 won't optimize anything, so return zero. */
4519 nbitsize
= GET_MODE_BITSIZE (nmode
);
4520 nbitpos
= lbitpos
& ~ (nbitsize
- 1);
4522 if (nbitsize
== lbitsize
)
4525 if (lreversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
4526 lbitpos
= nbitsize
- lbitsize
- lbitpos
;
4528 /* Make the mask to be used against the extracted field. */
4529 mask
= build_int_cst_type (unsigned_type
, -1);
4530 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (nbitsize
- lbitsize
));
4531 mask
= const_binop (RSHIFT_EXPR
, mask
,
4532 size_int (nbitsize
- lbitsize
- lbitpos
));
4539 /* If not comparing with constant, just rework the comparison
4541 tree t1
= make_bit_field_ref (loc
, linner
, lhs
, unsigned_type
,
4542 nbitsize
, nbitpos
, 1, lreversep
);
4543 t1
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
, t1
, mask
);
4544 tree t2
= make_bit_field_ref (loc
, rinner
, rhs
, unsigned_type
,
4545 nbitsize
, nbitpos
, 1, rreversep
);
4546 t2
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
, t2
, mask
);
4547 return fold_build2_loc (loc
, code
, compare_type
, t1
, t2
);
4550 /* Otherwise, we are handling the constant case. See if the constant is too
4551 big for the field. Warn and return a tree for 0 (false) if so. We do
4552 this not only for its own sake, but to avoid having to test for this
4553 error case below. If we didn't, we might generate wrong code.
4555 For unsigned fields, the constant shifted right by the field length should
4556 be all zero. For signed fields, the high-order bits should agree with
4561 if (wi::lrshift (wi::to_wide (rhs
), lbitsize
) != 0)
4563 warning (0, "comparison is always %d due to width of bit-field",
4565 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
4570 wide_int tem
= wi::arshift (wi::to_wide (rhs
), lbitsize
- 1);
4571 if (tem
!= 0 && tem
!= -1)
4573 warning (0, "comparison is always %d due to width of bit-field",
4575 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
4582 /* Single-bit compares should always be against zero. */
4583 if (lbitsize
== 1 && ! integer_zerop (rhs
))
4585 code
= code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
;
4586 rhs
= build_int_cst (type
, 0);
4589 /* Make a new bitfield reference, shift the constant over the
4590 appropriate number of bits and mask it with the computed mask
4591 (in case this was a signed field). If we changed it, make a new one. */
4592 lhs
= make_bit_field_ref (loc
, linner
, lhs
, unsigned_type
,
4593 nbitsize
, nbitpos
, 1, lreversep
);
4595 rhs
= const_binop (BIT_AND_EXPR
,
4596 const_binop (LSHIFT_EXPR
,
4597 fold_convert_loc (loc
, unsigned_type
, rhs
),
4598 size_int (lbitpos
)),
4601 lhs
= build2_loc (loc
, code
, compare_type
,
4602 build2 (BIT_AND_EXPR
, unsigned_type
, lhs
, mask
), rhs
);
4606 /* Subroutine for fold_truth_andor_1: decode a field reference.
4608 If EXP is a comparison reference, we return the innermost reference.
4610 *PBITSIZE is set to the number of bits in the reference, *PBITPOS is
4611 set to the starting bit number.
4613 If the innermost field can be completely contained in a mode-sized
4614 unit, *PMODE is set to that mode. Otherwise, it is set to VOIDmode.
4616 *PVOLATILEP is set to 1 if the any expression encountered is volatile;
4617 otherwise it is not changed.
4619 *PUNSIGNEDP is set to the signedness of the field.
4621 *PREVERSEP is set to the storage order of the field.
4623 *PMASK is set to the mask used. This is either contained in a
4624 BIT_AND_EXPR or derived from the width of the field.
4626 *PAND_MASK is set to the mask found in a BIT_AND_EXPR, if any.
4628 Return 0 if this is not a component reference or is one that we can't
4629 do anything with. */
4632 decode_field_reference (location_t loc
, tree
*exp_
, HOST_WIDE_INT
*pbitsize
,
4633 HOST_WIDE_INT
*pbitpos
, machine_mode
*pmode
,
4634 int *punsignedp
, int *preversep
, int *pvolatilep
,
4635 tree
*pmask
, tree
*pand_mask
)
4638 tree outer_type
= 0;
4640 tree mask
, inner
, offset
;
4642 unsigned int precision
;
4644 /* All the optimizations using this function assume integer fields.
4645 There are problems with FP fields since the type_for_size call
4646 below can fail for, e.g., XFmode. */
4647 if (! INTEGRAL_TYPE_P (TREE_TYPE (exp
)))
4650 /* We are interested in the bare arrangement of bits, so strip everything
4651 that doesn't affect the machine mode. However, record the type of the
4652 outermost expression if it may matter below. */
4653 if (CONVERT_EXPR_P (exp
)
4654 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
4655 outer_type
= TREE_TYPE (exp
);
4658 if (TREE_CODE (exp
) == BIT_AND_EXPR
)
4660 and_mask
= TREE_OPERAND (exp
, 1);
4661 exp
= TREE_OPERAND (exp
, 0);
4662 STRIP_NOPS (exp
); STRIP_NOPS (and_mask
);
4663 if (TREE_CODE (and_mask
) != INTEGER_CST
)
4667 poly_int64 poly_bitsize
, poly_bitpos
;
4668 inner
= get_inner_reference (exp
, &poly_bitsize
, &poly_bitpos
, &offset
,
4669 pmode
, punsignedp
, preversep
, pvolatilep
);
4670 if ((inner
== exp
&& and_mask
== 0)
4671 || !poly_bitsize
.is_constant (pbitsize
)
4672 || !poly_bitpos
.is_constant (pbitpos
)
4675 || TREE_CODE (inner
) == PLACEHOLDER_EXPR
4676 /* Reject out-of-bound accesses (PR79731). */
4677 || (! AGGREGATE_TYPE_P (TREE_TYPE (inner
))
4678 && compare_tree_int (TYPE_SIZE (TREE_TYPE (inner
)),
4679 *pbitpos
+ *pbitsize
) < 0))
4682 unsigned_type
= lang_hooks
.types
.type_for_size (*pbitsize
, 1);
4683 if (unsigned_type
== NULL_TREE
)
4688 /* If the number of bits in the reference is the same as the bitsize of
4689 the outer type, then the outer type gives the signedness. Otherwise
4690 (in case of a small bitfield) the signedness is unchanged. */
4691 if (outer_type
&& *pbitsize
== TYPE_PRECISION (outer_type
))
4692 *punsignedp
= TYPE_UNSIGNED (outer_type
);
4694 /* Compute the mask to access the bitfield. */
4695 precision
= TYPE_PRECISION (unsigned_type
);
4697 mask
= build_int_cst_type (unsigned_type
, -1);
4699 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
4700 mask
= const_binop (RSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
4702 /* Merge it with the mask we found in the BIT_AND_EXPR, if any. */
4704 mask
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
4705 fold_convert_loc (loc
, unsigned_type
, and_mask
), mask
);
4708 *pand_mask
= and_mask
;
4712 /* Return nonzero if MASK represents a mask of SIZE ones in the low-order
4713 bit positions and MASK is SIGNED. */
4716 all_ones_mask_p (const_tree mask
, unsigned int size
)
4718 tree type
= TREE_TYPE (mask
);
4719 unsigned int precision
= TYPE_PRECISION (type
);
4721 /* If this function returns true when the type of the mask is
4722 UNSIGNED, then there will be errors. In particular see
4723 gcc.c-torture/execute/990326-1.c. There does not appear to be
4724 any documentation paper trail as to why this is so. But the pre
4725 wide-int worked with that restriction and it has been preserved
4727 if (size
> precision
|| TYPE_SIGN (type
) == UNSIGNED
)
4730 return wi::mask (size
, false, precision
) == wi::to_wide (mask
);
4733 /* Subroutine for fold: determine if VAL is the INTEGER_CONST that
4734 represents the sign bit of EXP's type. If EXP represents a sign
4735 or zero extension, also test VAL against the unextended type.
4736 The return value is the (sub)expression whose sign bit is VAL,
4737 or NULL_TREE otherwise. */
4740 sign_bit_p (tree exp
, const_tree val
)
4745 /* Tree EXP must have an integral type. */
4746 t
= TREE_TYPE (exp
);
4747 if (! INTEGRAL_TYPE_P (t
))
4750 /* Tree VAL must be an integer constant. */
4751 if (TREE_CODE (val
) != INTEGER_CST
4752 || TREE_OVERFLOW (val
))
4755 width
= TYPE_PRECISION (t
);
4756 if (wi::only_sign_bit_p (wi::to_wide (val
), width
))
4759 /* Handle extension from a narrower type. */
4760 if (TREE_CODE (exp
) == NOP_EXPR
4761 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp
, 0))) < width
)
4762 return sign_bit_p (TREE_OPERAND (exp
, 0), val
);
4767 /* Subroutine for fold_truth_andor_1: determine if an operand is simple enough
4768 to be evaluated unconditionally. */
4771 simple_operand_p (const_tree exp
)
4773 /* Strip any conversions that don't change the machine mode. */
4776 return (CONSTANT_CLASS_P (exp
)
4777 || TREE_CODE (exp
) == SSA_NAME
4779 && ! TREE_ADDRESSABLE (exp
)
4780 && ! TREE_THIS_VOLATILE (exp
)
4781 && ! DECL_NONLOCAL (exp
)
4782 /* Don't regard global variables as simple. They may be
4783 allocated in ways unknown to the compiler (shared memory,
4784 #pragma weak, etc). */
4785 && ! TREE_PUBLIC (exp
)
4786 && ! DECL_EXTERNAL (exp
)
4787 /* Weakrefs are not safe to be read, since they can be NULL.
4788 They are !TREE_PUBLIC && !DECL_EXTERNAL but still
4789 have DECL_WEAK flag set. */
4790 && (! VAR_OR_FUNCTION_DECL_P (exp
) || ! DECL_WEAK (exp
))
4791 /* Loading a static variable is unduly expensive, but global
4792 registers aren't expensive. */
4793 && (! TREE_STATIC (exp
) || DECL_REGISTER (exp
))));
4796 /* Subroutine for fold_truth_andor: determine if an operand is simple enough
4797 to be evaluated unconditionally.
4798 I addition to simple_operand_p, we assume that comparisons, conversions,
4799 and logic-not operations are simple, if their operands are simple, too. */
4802 simple_operand_p_2 (tree exp
)
4804 enum tree_code code
;
4806 if (TREE_SIDE_EFFECTS (exp
) || generic_expr_could_trap_p (exp
))
4809 while (CONVERT_EXPR_P (exp
))
4810 exp
= TREE_OPERAND (exp
, 0);
4812 code
= TREE_CODE (exp
);
4814 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
4815 return (simple_operand_p (TREE_OPERAND (exp
, 0))
4816 && simple_operand_p (TREE_OPERAND (exp
, 1)));
4818 if (code
== TRUTH_NOT_EXPR
)
4819 return simple_operand_p_2 (TREE_OPERAND (exp
, 0));
4821 return simple_operand_p (exp
);
4825 /* The following functions are subroutines to fold_range_test and allow it to
4826 try to change a logical combination of comparisons into a range test.
4829 X == 2 || X == 3 || X == 4 || X == 5
4833 (unsigned) (X - 2) <= 3
4835 We describe each set of comparisons as being either inside or outside
4836 a range, using a variable named like IN_P, and then describe the
4837 range with a lower and upper bound. If one of the bounds is omitted,
4838 it represents either the highest or lowest value of the type.
4840 In the comments below, we represent a range by two numbers in brackets
4841 preceded by a "+" to designate being inside that range, or a "-" to
4842 designate being outside that range, so the condition can be inverted by
4843 flipping the prefix. An omitted bound is represented by a "-". For
4844 example, "- [-, 10]" means being outside the range starting at the lowest
4845 possible value and ending at 10, in other words, being greater than 10.
4846 The range "+ [-, -]" is always true and hence the range "- [-, -]" is
4849 We set up things so that the missing bounds are handled in a consistent
4850 manner so neither a missing bound nor "true" and "false" need to be
4851 handled using a special case. */
4853 /* Return the result of applying CODE to ARG0 and ARG1, but handle the case
4854 of ARG0 and/or ARG1 being omitted, meaning an unlimited range. UPPER0_P
4855 and UPPER1_P are nonzero if the respective argument is an upper bound
4856 and zero for a lower. TYPE, if nonzero, is the type of the result; it
4857 must be specified for a comparison. ARG1 will be converted to ARG0's
4858 type if both are specified. */
4861 range_binop (enum tree_code code
, tree type
, tree arg0
, int upper0_p
,
4862 tree arg1
, int upper1_p
)
4868 /* If neither arg represents infinity, do the normal operation.
4869 Else, if not a comparison, return infinity. Else handle the special
4870 comparison rules. Note that most of the cases below won't occur, but
4871 are handled for consistency. */
4873 if (arg0
!= 0 && arg1
!= 0)
4875 tem
= fold_build2 (code
, type
!= 0 ? type
: TREE_TYPE (arg0
),
4876 arg0
, fold_convert (TREE_TYPE (arg0
), arg1
));
4878 return TREE_CODE (tem
) == INTEGER_CST
? tem
: 0;
4881 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
4884 /* Set SGN[01] to -1 if ARG[01] is a lower bound, 1 for upper, and 0
4885 for neither. In real maths, we cannot assume open ended ranges are
4886 the same. But, this is computer arithmetic, where numbers are finite.
4887 We can therefore make the transformation of any unbounded range with
4888 the value Z, Z being greater than any representable number. This permits
4889 us to treat unbounded ranges as equal. */
4890 sgn0
= arg0
!= 0 ? 0 : (upper0_p
? 1 : -1);
4891 sgn1
= arg1
!= 0 ? 0 : (upper1_p
? 1 : -1);
4895 result
= sgn0
== sgn1
;
4898 result
= sgn0
!= sgn1
;
4901 result
= sgn0
< sgn1
;
4904 result
= sgn0
<= sgn1
;
4907 result
= sgn0
> sgn1
;
4910 result
= sgn0
>= sgn1
;
4916 return constant_boolean_node (result
, type
);
4919 /* Helper routine for make_range. Perform one step for it, return
4920 new expression if the loop should continue or NULL_TREE if it should
4924 make_range_step (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
,
4925 tree exp_type
, tree
*p_low
, tree
*p_high
, int *p_in_p
,
4926 bool *strict_overflow_p
)
4928 tree arg0_type
= TREE_TYPE (arg0
);
4929 tree n_low
, n_high
, low
= *p_low
, high
= *p_high
;
4930 int in_p
= *p_in_p
, n_in_p
;
4934 case TRUTH_NOT_EXPR
:
4935 /* We can only do something if the range is testing for zero. */
4936 if (low
== NULL_TREE
|| high
== NULL_TREE
4937 || ! integer_zerop (low
) || ! integer_zerop (high
))
4942 case EQ_EXPR
: case NE_EXPR
:
4943 case LT_EXPR
: case LE_EXPR
: case GE_EXPR
: case GT_EXPR
:
4944 /* We can only do something if the range is testing for zero
4945 and if the second operand is an integer constant. Note that
4946 saying something is "in" the range we make is done by
4947 complementing IN_P since it will set in the initial case of
4948 being not equal to zero; "out" is leaving it alone. */
4949 if (low
== NULL_TREE
|| high
== NULL_TREE
4950 || ! integer_zerop (low
) || ! integer_zerop (high
)
4951 || TREE_CODE (arg1
) != INTEGER_CST
)
4956 case NE_EXPR
: /* - [c, c] */
4959 case EQ_EXPR
: /* + [c, c] */
4960 in_p
= ! in_p
, low
= high
= arg1
;
4962 case GT_EXPR
: /* - [-, c] */
4963 low
= 0, high
= arg1
;
4965 case GE_EXPR
: /* + [c, -] */
4966 in_p
= ! in_p
, low
= arg1
, high
= 0;
4968 case LT_EXPR
: /* - [c, -] */
4969 low
= arg1
, high
= 0;
4971 case LE_EXPR
: /* + [-, c] */
4972 in_p
= ! in_p
, low
= 0, high
= arg1
;
4978 /* If this is an unsigned comparison, we also know that EXP is
4979 greater than or equal to zero. We base the range tests we make
4980 on that fact, so we record it here so we can parse existing
4981 range tests. We test arg0_type since often the return type
4982 of, e.g. EQ_EXPR, is boolean. */
4983 if (TYPE_UNSIGNED (arg0_type
) && (low
== 0 || high
== 0))
4985 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
,
4987 build_int_cst (arg0_type
, 0),
4991 in_p
= n_in_p
, low
= n_low
, high
= n_high
;
4993 /* If the high bound is missing, but we have a nonzero low
4994 bound, reverse the range so it goes from zero to the low bound
4996 if (high
== 0 && low
&& ! integer_zerop (low
))
4999 high
= range_binop (MINUS_EXPR
, NULL_TREE
, low
, 0,
5000 build_int_cst (TREE_TYPE (low
), 1), 0);
5001 low
= build_int_cst (arg0_type
, 0);
5011 /* If flag_wrapv and ARG0_TYPE is signed, make sure
5012 low and high are non-NULL, then normalize will DTRT. */
5013 if (!TYPE_UNSIGNED (arg0_type
)
5014 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
5016 if (low
== NULL_TREE
)
5017 low
= TYPE_MIN_VALUE (arg0_type
);
5018 if (high
== NULL_TREE
)
5019 high
= TYPE_MAX_VALUE (arg0_type
);
5022 /* (-x) IN [a,b] -> x in [-b, -a] */
5023 n_low
= range_binop (MINUS_EXPR
, exp_type
,
5024 build_int_cst (exp_type
, 0),
5026 n_high
= range_binop (MINUS_EXPR
, exp_type
,
5027 build_int_cst (exp_type
, 0),
5029 if (n_high
!= 0 && TREE_OVERFLOW (n_high
))
5035 return build2_loc (loc
, MINUS_EXPR
, exp_type
, negate_expr (arg0
),
5036 build_int_cst (exp_type
, 1));
5040 if (TREE_CODE (arg1
) != INTEGER_CST
)
5043 /* If flag_wrapv and ARG0_TYPE is signed, then we cannot
5044 move a constant to the other side. */
5045 if (!TYPE_UNSIGNED (arg0_type
)
5046 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
5049 /* If EXP is signed, any overflow in the computation is undefined,
5050 so we don't worry about it so long as our computations on
5051 the bounds don't overflow. For unsigned, overflow is defined
5052 and this is exactly the right thing. */
5053 n_low
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
5054 arg0_type
, low
, 0, arg1
, 0);
5055 n_high
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
5056 arg0_type
, high
, 1, arg1
, 0);
5057 if ((n_low
!= 0 && TREE_OVERFLOW (n_low
))
5058 || (n_high
!= 0 && TREE_OVERFLOW (n_high
)))
5061 if (TYPE_OVERFLOW_UNDEFINED (arg0_type
))
5062 *strict_overflow_p
= true;
5065 /* Check for an unsigned range which has wrapped around the maximum
5066 value thus making n_high < n_low, and normalize it. */
5067 if (n_low
&& n_high
&& tree_int_cst_lt (n_high
, n_low
))
5069 low
= range_binop (PLUS_EXPR
, arg0_type
, n_high
, 0,
5070 build_int_cst (TREE_TYPE (n_high
), 1), 0);
5071 high
= range_binop (MINUS_EXPR
, arg0_type
, n_low
, 0,
5072 build_int_cst (TREE_TYPE (n_low
), 1), 0);
5074 /* If the range is of the form +/- [ x+1, x ], we won't
5075 be able to normalize it. But then, it represents the
5076 whole range or the empty set, so make it
5078 if (tree_int_cst_equal (n_low
, low
)
5079 && tree_int_cst_equal (n_high
, high
))
5085 low
= n_low
, high
= n_high
;
5093 case NON_LVALUE_EXPR
:
5094 if (TYPE_PRECISION (arg0_type
) > TYPE_PRECISION (exp_type
))
5097 if (! INTEGRAL_TYPE_P (arg0_type
)
5098 || (low
!= 0 && ! int_fits_type_p (low
, arg0_type
))
5099 || (high
!= 0 && ! int_fits_type_p (high
, arg0_type
)))
5102 n_low
= low
, n_high
= high
;
5105 n_low
= fold_convert_loc (loc
, arg0_type
, n_low
);
5108 n_high
= fold_convert_loc (loc
, arg0_type
, n_high
);
5110 /* If we're converting arg0 from an unsigned type, to exp,
5111 a signed type, we will be doing the comparison as unsigned.
5112 The tests above have already verified that LOW and HIGH
5115 So we have to ensure that we will handle large unsigned
5116 values the same way that the current signed bounds treat
5119 if (!TYPE_UNSIGNED (exp_type
) && TYPE_UNSIGNED (arg0_type
))
5123 /* For fixed-point modes, we need to pass the saturating flag
5124 as the 2nd parameter. */
5125 if (ALL_FIXED_POINT_MODE_P (TYPE_MODE (arg0_type
)))
5127 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
),
5128 TYPE_SATURATING (arg0_type
));
5131 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
), 1);
5133 /* A range without an upper bound is, naturally, unbounded.
5134 Since convert would have cropped a very large value, use
5135 the max value for the destination type. */
5137 = TYPE_MAX_VALUE (equiv_type
) ? TYPE_MAX_VALUE (equiv_type
)
5138 : TYPE_MAX_VALUE (arg0_type
);
5140 if (TYPE_PRECISION (exp_type
) == TYPE_PRECISION (arg0_type
))
5141 high_positive
= fold_build2_loc (loc
, RSHIFT_EXPR
, arg0_type
,
5142 fold_convert_loc (loc
, arg0_type
,
5144 build_int_cst (arg0_type
, 1));
5146 /* If the low bound is specified, "and" the range with the
5147 range for which the original unsigned value will be
5151 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 1, n_low
, n_high
,
5152 1, fold_convert_loc (loc
, arg0_type
,
5157 in_p
= (n_in_p
== in_p
);
5161 /* Otherwise, "or" the range with the range of the input
5162 that will be interpreted as negative. */
5163 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 0, n_low
, n_high
,
5164 1, fold_convert_loc (loc
, arg0_type
,
5169 in_p
= (in_p
!= n_in_p
);
5183 /* Given EXP, a logical expression, set the range it is testing into
5184 variables denoted by PIN_P, PLOW, and PHIGH. Return the expression
5185 actually being tested. *PLOW and *PHIGH will be made of the same
5186 type as the returned expression. If EXP is not a comparison, we
5187 will most likely not be returning a useful value and range. Set
5188 *STRICT_OVERFLOW_P to true if the return value is only valid
5189 because signed overflow is undefined; otherwise, do not change
5190 *STRICT_OVERFLOW_P. */
5193 make_range (tree exp
, int *pin_p
, tree
*plow
, tree
*phigh
,
5194 bool *strict_overflow_p
)
5196 enum tree_code code
;
5197 tree arg0
, arg1
= NULL_TREE
;
5198 tree exp_type
, nexp
;
5201 location_t loc
= EXPR_LOCATION (exp
);
5203 /* Start with simply saying "EXP != 0" and then look at the code of EXP
5204 and see if we can refine the range. Some of the cases below may not
5205 happen, but it doesn't seem worth worrying about this. We "continue"
5206 the outer loop when we've changed something; otherwise we "break"
5207 the switch, which will "break" the while. */
5210 low
= high
= build_int_cst (TREE_TYPE (exp
), 0);
5214 code
= TREE_CODE (exp
);
5215 exp_type
= TREE_TYPE (exp
);
5218 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
)))
5220 if (TREE_OPERAND_LENGTH (exp
) > 0)
5221 arg0
= TREE_OPERAND (exp
, 0);
5222 if (TREE_CODE_CLASS (code
) == tcc_binary
5223 || TREE_CODE_CLASS (code
) == tcc_comparison
5224 || (TREE_CODE_CLASS (code
) == tcc_expression
5225 && TREE_OPERAND_LENGTH (exp
) > 1))
5226 arg1
= TREE_OPERAND (exp
, 1);
5228 if (arg0
== NULL_TREE
)
5231 nexp
= make_range_step (loc
, code
, arg0
, arg1
, exp_type
, &low
,
5232 &high
, &in_p
, strict_overflow_p
);
5233 if (nexp
== NULL_TREE
)
5238 /* If EXP is a constant, we can evaluate whether this is true or false. */
5239 if (TREE_CODE (exp
) == INTEGER_CST
)
5241 in_p
= in_p
== (integer_onep (range_binop (GE_EXPR
, integer_type_node
,
5243 && integer_onep (range_binop (LE_EXPR
, integer_type_node
,
5249 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
5253 /* Returns TRUE if [LOW, HIGH] range check can be optimized to
5254 a bitwise check i.e. when
5255 LOW == 0xXX...X00...0
5256 HIGH == 0xXX...X11...1
5257 Return corresponding mask in MASK and stem in VALUE. */
5260 maskable_range_p (const_tree low
, const_tree high
, tree type
, tree
*mask
,
5263 if (TREE_CODE (low
) != INTEGER_CST
5264 || TREE_CODE (high
) != INTEGER_CST
)
5267 unsigned prec
= TYPE_PRECISION (type
);
5268 wide_int lo
= wi::to_wide (low
, prec
);
5269 wide_int hi
= wi::to_wide (high
, prec
);
5271 wide_int end_mask
= lo
^ hi
;
5272 if ((end_mask
& (end_mask
+ 1)) != 0
5273 || (lo
& end_mask
) != 0)
5276 wide_int stem_mask
= ~end_mask
;
5277 wide_int stem
= lo
& stem_mask
;
5278 if (stem
!= (hi
& stem_mask
))
5281 *mask
= wide_int_to_tree (type
, stem_mask
);
5282 *value
= wide_int_to_tree (type
, stem
);
5287 /* Helper routine for build_range_check and match.pd. Return the type to
5288 perform the check or NULL if it shouldn't be optimized. */
5291 range_check_type (tree etype
)
5293 /* First make sure that arithmetics in this type is valid, then make sure
5294 that it wraps around. */
5295 if (TREE_CODE (etype
) == ENUMERAL_TYPE
|| TREE_CODE (etype
) == BOOLEAN_TYPE
)
5296 etype
= lang_hooks
.types
.type_for_size (TYPE_PRECISION (etype
), 1);
5298 if (TREE_CODE (etype
) == INTEGER_TYPE
&& !TYPE_UNSIGNED (etype
))
5300 tree utype
, minv
, maxv
;
5302 /* Check if (unsigned) INT_MAX + 1 == (unsigned) INT_MIN
5303 for the type in question, as we rely on this here. */
5304 utype
= unsigned_type_for (etype
);
5305 maxv
= fold_convert (utype
, TYPE_MAX_VALUE (etype
));
5306 maxv
= range_binop (PLUS_EXPR
, NULL_TREE
, maxv
, 1,
5307 build_int_cst (TREE_TYPE (maxv
), 1), 1);
5308 minv
= fold_convert (utype
, TYPE_MIN_VALUE (etype
));
5310 if (integer_zerop (range_binop (NE_EXPR
, integer_type_node
,
5316 else if (POINTER_TYPE_P (etype
))
5317 etype
= unsigned_type_for (etype
);
5321 /* Given a range, LOW, HIGH, and IN_P, an expression, EXP, and a result
5322 type, TYPE, return an expression to test if EXP is in (or out of, depending
5323 on IN_P) the range. Return 0 if the test couldn't be created. */
5326 build_range_check (location_t loc
, tree type
, tree exp
, int in_p
,
5327 tree low
, tree high
)
5329 tree etype
= TREE_TYPE (exp
), mask
, value
;
5331 /* Disable this optimization for function pointer expressions
5332 on targets that require function pointer canonicalization. */
5333 if (targetm
.have_canonicalize_funcptr_for_compare ()
5334 && POINTER_TYPE_P (etype
)
5335 && FUNC_OR_METHOD_TYPE_P (TREE_TYPE (etype
)))
5340 value
= build_range_check (loc
, type
, exp
, 1, low
, high
);
5342 return invert_truthvalue_loc (loc
, value
);
5347 if (low
== 0 && high
== 0)
5348 return omit_one_operand_loc (loc
, type
, build_int_cst (type
, 1), exp
);
5351 return fold_build2_loc (loc
, LE_EXPR
, type
, exp
,
5352 fold_convert_loc (loc
, etype
, high
));
5355 return fold_build2_loc (loc
, GE_EXPR
, type
, exp
,
5356 fold_convert_loc (loc
, etype
, low
));
5358 if (operand_equal_p (low
, high
, 0))
5359 return fold_build2_loc (loc
, EQ_EXPR
, type
, exp
,
5360 fold_convert_loc (loc
, etype
, low
));
5362 if (TREE_CODE (exp
) == BIT_AND_EXPR
5363 && maskable_range_p (low
, high
, etype
, &mask
, &value
))
5364 return fold_build2_loc (loc
, EQ_EXPR
, type
,
5365 fold_build2_loc (loc
, BIT_AND_EXPR
, etype
,
5369 if (integer_zerop (low
))
5371 if (! TYPE_UNSIGNED (etype
))
5373 etype
= unsigned_type_for (etype
);
5374 high
= fold_convert_loc (loc
, etype
, high
);
5375 exp
= fold_convert_loc (loc
, etype
, exp
);
5377 return build_range_check (loc
, type
, exp
, 1, 0, high
);
5380 /* Optimize (c>=1) && (c<=127) into (signed char)c > 0. */
5381 if (integer_onep (low
) && TREE_CODE (high
) == INTEGER_CST
)
5383 int prec
= TYPE_PRECISION (etype
);
5385 if (wi::mask
<widest_int
> (prec
- 1, false) == wi::to_widest (high
))
5387 if (TYPE_UNSIGNED (etype
))
5389 tree signed_etype
= signed_type_for (etype
);
5390 if (TYPE_PRECISION (signed_etype
) != TYPE_PRECISION (etype
))
5392 = build_nonstandard_integer_type (TYPE_PRECISION (etype
), 0);
5394 etype
= signed_etype
;
5395 exp
= fold_convert_loc (loc
, etype
, exp
);
5397 return fold_build2_loc (loc
, GT_EXPR
, type
, exp
,
5398 build_int_cst (etype
, 0));
5402 /* Optimize (c>=low) && (c<=high) into (c-low>=0) && (c-low<=high-low).
5403 This requires wrap-around arithmetics for the type of the expression. */
5404 etype
= range_check_type (etype
);
5405 if (etype
== NULL_TREE
)
5408 high
= fold_convert_loc (loc
, etype
, high
);
5409 low
= fold_convert_loc (loc
, etype
, low
);
5410 exp
= fold_convert_loc (loc
, etype
, exp
);
5412 value
= const_binop (MINUS_EXPR
, high
, low
);
5414 if (value
!= 0 && !TREE_OVERFLOW (value
))
5415 return build_range_check (loc
, type
,
5416 fold_build2_loc (loc
, MINUS_EXPR
, etype
, exp
, low
),
5417 1, build_int_cst (etype
, 0), value
);
5422 /* Return the predecessor of VAL in its type, handling the infinite case. */
5425 range_predecessor (tree val
)
5427 tree type
= TREE_TYPE (val
);
5429 if (INTEGRAL_TYPE_P (type
)
5430 && operand_equal_p (val
, TYPE_MIN_VALUE (type
), 0))
5433 return range_binop (MINUS_EXPR
, NULL_TREE
, val
, 0,
5434 build_int_cst (TREE_TYPE (val
), 1), 0);
5437 /* Return the successor of VAL in its type, handling the infinite case. */
5440 range_successor (tree val
)
5442 tree type
= TREE_TYPE (val
);
5444 if (INTEGRAL_TYPE_P (type
)
5445 && operand_equal_p (val
, TYPE_MAX_VALUE (type
), 0))
5448 return range_binop (PLUS_EXPR
, NULL_TREE
, val
, 0,
5449 build_int_cst (TREE_TYPE (val
), 1), 0);
5452 /* Given two ranges, see if we can merge them into one. Return 1 if we
5453 can, 0 if we can't. Set the output range into the specified parameters. */
5456 merge_ranges (int *pin_p
, tree
*plow
, tree
*phigh
, int in0_p
, tree low0
,
5457 tree high0
, int in1_p
, tree low1
, tree high1
)
5465 int lowequal
= ((low0
== 0 && low1
== 0)
5466 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
5467 low0
, 0, low1
, 0)));
5468 int highequal
= ((high0
== 0 && high1
== 0)
5469 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
5470 high0
, 1, high1
, 1)));
5472 /* Make range 0 be the range that starts first, or ends last if they
5473 start at the same value. Swap them if it isn't. */
5474 if (integer_onep (range_binop (GT_EXPR
, integer_type_node
,
5477 && integer_onep (range_binop (GT_EXPR
, integer_type_node
,
5478 high1
, 1, high0
, 1))))
5480 temp
= in0_p
, in0_p
= in1_p
, in1_p
= temp
;
5481 tem
= low0
, low0
= low1
, low1
= tem
;
5482 tem
= high0
, high0
= high1
, high1
= tem
;
5485 /* If the second range is != high1 where high1 is the type maximum of
5486 the type, try first merging with < high1 range. */
5489 && TREE_CODE (low1
) == INTEGER_CST
5490 && (TREE_CODE (TREE_TYPE (low1
)) == INTEGER_TYPE
5491 || (TREE_CODE (TREE_TYPE (low1
)) == ENUMERAL_TYPE
5492 && known_eq (TYPE_PRECISION (TREE_TYPE (low1
)),
5493 GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (low1
))))))
5494 && operand_equal_p (low1
, high1
, 0))
5496 if (tree_int_cst_equal (low1
, TYPE_MAX_VALUE (TREE_TYPE (low1
)))
5497 && merge_ranges (pin_p
, plow
, phigh
, in0_p
, low0
, high0
,
5498 !in1_p
, NULL_TREE
, range_predecessor (low1
)))
5500 /* Similarly for the second range != low1 where low1 is the type minimum
5501 of the type, try first merging with > low1 range. */
5502 if (tree_int_cst_equal (low1
, TYPE_MIN_VALUE (TREE_TYPE (low1
)))
5503 && merge_ranges (pin_p
, plow
, phigh
, in0_p
, low0
, high0
,
5504 !in1_p
, range_successor (low1
), NULL_TREE
))
5508 /* Now flag two cases, whether the ranges are disjoint or whether the
5509 second range is totally subsumed in the first. Note that the tests
5510 below are simplified by the ones above. */
5511 no_overlap
= integer_onep (range_binop (LT_EXPR
, integer_type_node
,
5512 high0
, 1, low1
, 0));
5513 subset
= integer_onep (range_binop (LE_EXPR
, integer_type_node
,
5514 high1
, 1, high0
, 1));
5516 /* We now have four cases, depending on whether we are including or
5517 excluding the two ranges. */
5520 /* If they don't overlap, the result is false. If the second range
5521 is a subset it is the result. Otherwise, the range is from the start
5522 of the second to the end of the first. */
5524 in_p
= 0, low
= high
= 0;
5526 in_p
= 1, low
= low1
, high
= high1
;
5528 in_p
= 1, low
= low1
, high
= high0
;
5531 else if (in0_p
&& ! in1_p
)
5533 /* If they don't overlap, the result is the first range. If they are
5534 equal, the result is false. If the second range is a subset of the
5535 first, and the ranges begin at the same place, we go from just after
5536 the end of the second range to the end of the first. If the second
5537 range is not a subset of the first, or if it is a subset and both
5538 ranges end at the same place, the range starts at the start of the
5539 first range and ends just before the second range.
5540 Otherwise, we can't describe this as a single range. */
5542 in_p
= 1, low
= low0
, high
= high0
;
5543 else if (lowequal
&& highequal
)
5544 in_p
= 0, low
= high
= 0;
5545 else if (subset
&& lowequal
)
5547 low
= range_successor (high1
);
5552 /* We are in the weird situation where high0 > high1 but
5553 high1 has no successor. Punt. */
5557 else if (! subset
|| highequal
)
5560 high
= range_predecessor (low1
);
5564 /* low0 < low1 but low1 has no predecessor. Punt. */
5572 else if (! in0_p
&& in1_p
)
5574 /* If they don't overlap, the result is the second range. If the second
5575 is a subset of the first, the result is false. Otherwise,
5576 the range starts just after the first range and ends at the
5577 end of the second. */
5579 in_p
= 1, low
= low1
, high
= high1
;
5580 else if (subset
|| highequal
)
5581 in_p
= 0, low
= high
= 0;
5584 low
= range_successor (high0
);
5589 /* high1 > high0 but high0 has no successor. Punt. */
5597 /* The case where we are excluding both ranges. Here the complex case
5598 is if they don't overlap. In that case, the only time we have a
5599 range is if they are adjacent. If the second is a subset of the
5600 first, the result is the first. Otherwise, the range to exclude
5601 starts at the beginning of the first range and ends at the end of the
5605 if (integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
5606 range_successor (high0
),
5608 in_p
= 0, low
= low0
, high
= high1
;
5611 /* Canonicalize - [min, x] into - [-, x]. */
5612 if (low0
&& TREE_CODE (low0
) == INTEGER_CST
)
5613 switch (TREE_CODE (TREE_TYPE (low0
)))
5616 if (maybe_ne (TYPE_PRECISION (TREE_TYPE (low0
)),
5618 (TYPE_MODE (TREE_TYPE (low0
)))))
5622 if (tree_int_cst_equal (low0
,
5623 TYPE_MIN_VALUE (TREE_TYPE (low0
))))
5627 if (TYPE_UNSIGNED (TREE_TYPE (low0
))
5628 && integer_zerop (low0
))
5635 /* Canonicalize - [x, max] into - [x, -]. */
5636 if (high1
&& TREE_CODE (high1
) == INTEGER_CST
)
5637 switch (TREE_CODE (TREE_TYPE (high1
)))
5640 if (maybe_ne (TYPE_PRECISION (TREE_TYPE (high1
)),
5642 (TYPE_MODE (TREE_TYPE (high1
)))))
5646 if (tree_int_cst_equal (high1
,
5647 TYPE_MAX_VALUE (TREE_TYPE (high1
))))
5651 if (TYPE_UNSIGNED (TREE_TYPE (high1
))
5652 && integer_zerop (range_binop (PLUS_EXPR
, NULL_TREE
,
5654 build_int_cst (TREE_TYPE (high1
), 1),
5662 /* The ranges might be also adjacent between the maximum and
5663 minimum values of the given type. For
5664 - [{min,-}, x] and - [y, {max,-}] ranges where x + 1 < y
5665 return + [x + 1, y - 1]. */
5666 if (low0
== 0 && high1
== 0)
5668 low
= range_successor (high0
);
5669 high
= range_predecessor (low1
);
5670 if (low
== 0 || high
== 0)
5680 in_p
= 0, low
= low0
, high
= high0
;
5682 in_p
= 0, low
= low0
, high
= high1
;
5685 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
5690 /* Subroutine of fold, looking inside expressions of the form
5691 A op B ? A : C, where ARG0, ARG1 and ARG2 are the three operands
5692 of the COND_EXPR. This function is being used also to optimize
5693 A op B ? C : A, by reversing the comparison first.
5695 Return a folded expression whose code is not a COND_EXPR
5696 anymore, or NULL_TREE if no folding opportunity is found. */
5699 fold_cond_expr_with_comparison (location_t loc
, tree type
,
5700 tree arg0
, tree arg1
, tree arg2
)
5702 enum tree_code comp_code
= TREE_CODE (arg0
);
5703 tree arg00
= TREE_OPERAND (arg0
, 0);
5704 tree arg01
= TREE_OPERAND (arg0
, 1);
5705 tree arg1_type
= TREE_TYPE (arg1
);
5711 /* If we have A op 0 ? A : -A, consider applying the following
5714 A == 0? A : -A same as -A
5715 A != 0? A : -A same as A
5716 A >= 0? A : -A same as abs (A)
5717 A > 0? A : -A same as abs (A)
5718 A <= 0? A : -A same as -abs (A)
5719 A < 0? A : -A same as -abs (A)
5721 None of these transformations work for modes with signed
5722 zeros. If A is +/-0, the first two transformations will
5723 change the sign of the result (from +0 to -0, or vice
5724 versa). The last four will fix the sign of the result,
5725 even though the original expressions could be positive or
5726 negative, depending on the sign of A.
5728 Note that all these transformations are correct if A is
5729 NaN, since the two alternatives (A and -A) are also NaNs. */
5730 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5731 && (FLOAT_TYPE_P (TREE_TYPE (arg01
))
5732 ? real_zerop (arg01
)
5733 : integer_zerop (arg01
))
5734 && ((TREE_CODE (arg2
) == NEGATE_EXPR
5735 && operand_equal_p (TREE_OPERAND (arg2
, 0), arg1
, 0))
5736 /* In the case that A is of the form X-Y, '-A' (arg2) may
5737 have already been folded to Y-X, check for that. */
5738 || (TREE_CODE (arg1
) == MINUS_EXPR
5739 && TREE_CODE (arg2
) == MINUS_EXPR
5740 && operand_equal_p (TREE_OPERAND (arg1
, 0),
5741 TREE_OPERAND (arg2
, 1), 0)
5742 && operand_equal_p (TREE_OPERAND (arg1
, 1),
5743 TREE_OPERAND (arg2
, 0), 0))))
5748 tem
= fold_convert_loc (loc
, arg1_type
, arg1
);
5749 return fold_convert_loc (loc
, type
, negate_expr (tem
));
5752 return fold_convert_loc (loc
, type
, arg1
);
5755 if (flag_trapping_math
)
5760 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
5762 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
5763 return fold_convert_loc (loc
, type
, tem
);
5766 if (flag_trapping_math
)
5771 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
5773 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
5774 return negate_expr (fold_convert_loc (loc
, type
, tem
));
5776 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
5780 /* A != 0 ? A : 0 is simply A, unless A is -0. Likewise
5781 A == 0 ? A : 0 is always 0 unless A is -0. Note that
5782 both transformations are correct when A is NaN: A != 0
5783 is then true, and A == 0 is false. */
5785 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5786 && integer_zerop (arg01
) && integer_zerop (arg2
))
5788 if (comp_code
== NE_EXPR
)
5789 return fold_convert_loc (loc
, type
, arg1
);
5790 else if (comp_code
== EQ_EXPR
)
5791 return build_zero_cst (type
);
5794 /* Try some transformations of A op B ? A : B.
5796 A == B? A : B same as B
5797 A != B? A : B same as A
5798 A >= B? A : B same as max (A, B)
5799 A > B? A : B same as max (B, A)
5800 A <= B? A : B same as min (A, B)
5801 A < B? A : B same as min (B, A)
5803 As above, these transformations don't work in the presence
5804 of signed zeros. For example, if A and B are zeros of
5805 opposite sign, the first two transformations will change
5806 the sign of the result. In the last four, the original
5807 expressions give different results for (A=+0, B=-0) and
5808 (A=-0, B=+0), but the transformed expressions do not.
5810 The first two transformations are correct if either A or B
5811 is a NaN. In the first transformation, the condition will
5812 be false, and B will indeed be chosen. In the case of the
5813 second transformation, the condition A != B will be true,
5814 and A will be chosen.
5816 The conversions to max() and min() are not correct if B is
5817 a number and A is not. The conditions in the original
5818 expressions will be false, so all four give B. The min()
5819 and max() versions would give a NaN instead. */
5820 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5821 && operand_equal_for_comparison_p (arg01
, arg2
)
5822 /* Avoid these transformations if the COND_EXPR may be used
5823 as an lvalue in the C++ front-end. PR c++/19199. */
5825 || VECTOR_TYPE_P (type
)
5826 || (! lang_GNU_CXX ()
5827 && strcmp (lang_hooks
.name
, "GNU Objective-C++") != 0)
5828 || ! maybe_lvalue_p (arg1
)
5829 || ! maybe_lvalue_p (arg2
)))
5831 tree comp_op0
= arg00
;
5832 tree comp_op1
= arg01
;
5833 tree comp_type
= TREE_TYPE (comp_op0
);
5838 return fold_convert_loc (loc
, type
, arg2
);
5840 return fold_convert_loc (loc
, type
, arg1
);
5845 /* In C++ a ?: expression can be an lvalue, so put the
5846 operand which will be used if they are equal first
5847 so that we can convert this back to the
5848 corresponding COND_EXPR. */
5849 if (!HONOR_NANS (arg1
))
5851 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5852 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5853 tem
= (comp_code
== LE_EXPR
|| comp_code
== UNLE_EXPR
)
5854 ? fold_build2_loc (loc
, MIN_EXPR
, comp_type
, comp_op0
, comp_op1
)
5855 : fold_build2_loc (loc
, MIN_EXPR
, comp_type
,
5856 comp_op1
, comp_op0
);
5857 return fold_convert_loc (loc
, type
, tem
);
5864 if (!HONOR_NANS (arg1
))
5866 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5867 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5868 tem
= (comp_code
== GE_EXPR
|| comp_code
== UNGE_EXPR
)
5869 ? fold_build2_loc (loc
, MAX_EXPR
, comp_type
, comp_op0
, comp_op1
)
5870 : fold_build2_loc (loc
, MAX_EXPR
, comp_type
,
5871 comp_op1
, comp_op0
);
5872 return fold_convert_loc (loc
, type
, tem
);
5876 if (!HONOR_NANS (arg1
))
5877 return fold_convert_loc (loc
, type
, arg2
);
5880 if (!HONOR_NANS (arg1
))
5881 return fold_convert_loc (loc
, type
, arg1
);
5884 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
5894 #ifndef LOGICAL_OP_NON_SHORT_CIRCUIT
5895 #define LOGICAL_OP_NON_SHORT_CIRCUIT \
5896 (BRANCH_COST (optimize_function_for_speed_p (cfun), \
5900 /* EXP is some logical combination of boolean tests. See if we can
5901 merge it into some range test. Return the new tree if so. */
5904 fold_range_test (location_t loc
, enum tree_code code
, tree type
,
5907 int or_op
= (code
== TRUTH_ORIF_EXPR
5908 || code
== TRUTH_OR_EXPR
);
5909 int in0_p
, in1_p
, in_p
;
5910 tree low0
, low1
, low
, high0
, high1
, high
;
5911 bool strict_overflow_p
= false;
5913 const char * const warnmsg
= G_("assuming signed overflow does not occur "
5914 "when simplifying range test");
5916 if (!INTEGRAL_TYPE_P (type
))
5919 lhs
= make_range (op0
, &in0_p
, &low0
, &high0
, &strict_overflow_p
);
5920 rhs
= make_range (op1
, &in1_p
, &low1
, &high1
, &strict_overflow_p
);
5922 /* If this is an OR operation, invert both sides; we will invert
5923 again at the end. */
5925 in0_p
= ! in0_p
, in1_p
= ! in1_p
;
5927 /* If both expressions are the same, if we can merge the ranges, and we
5928 can build the range test, return it or it inverted. If one of the
5929 ranges is always true or always false, consider it to be the same
5930 expression as the other. */
5931 if ((lhs
== 0 || rhs
== 0 || operand_equal_p (lhs
, rhs
, 0))
5932 && merge_ranges (&in_p
, &low
, &high
, in0_p
, low0
, high0
,
5934 && (tem
= (build_range_check (loc
, type
,
5936 : rhs
!= 0 ? rhs
: integer_zero_node
,
5937 in_p
, low
, high
))) != 0)
5939 if (strict_overflow_p
)
5940 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
5941 return or_op
? invert_truthvalue_loc (loc
, tem
) : tem
;
5944 /* On machines where the branch cost is expensive, if this is a
5945 short-circuited branch and the underlying object on both sides
5946 is the same, make a non-short-circuit operation. */
5947 bool logical_op_non_short_circuit
= LOGICAL_OP_NON_SHORT_CIRCUIT
;
5948 if (param_logical_op_non_short_circuit
!= -1)
5949 logical_op_non_short_circuit
5950 = param_logical_op_non_short_circuit
;
5951 if (logical_op_non_short_circuit
5952 && !flag_sanitize_coverage
5953 && lhs
!= 0 && rhs
!= 0
5954 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
)
5955 && operand_equal_p (lhs
, rhs
, 0))
5957 /* If simple enough, just rewrite. Otherwise, make a SAVE_EXPR
5958 unless we are at top level or LHS contains a PLACEHOLDER_EXPR, in
5959 which cases we can't do this. */
5960 if (simple_operand_p (lhs
))
5961 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5962 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5965 else if (!lang_hooks
.decls
.global_bindings_p ()
5966 && !CONTAINS_PLACEHOLDER_P (lhs
))
5968 tree common
= save_expr (lhs
);
5970 if ((lhs
= build_range_check (loc
, type
, common
,
5971 or_op
? ! in0_p
: in0_p
,
5973 && (rhs
= build_range_check (loc
, type
, common
,
5974 or_op
? ! in1_p
: in1_p
,
5977 if (strict_overflow_p
)
5978 fold_overflow_warning (warnmsg
,
5979 WARN_STRICT_OVERFLOW_COMPARISON
);
5980 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5981 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5990 /* Subroutine for fold_truth_andor_1: C is an INTEGER_CST interpreted as a P
5991 bit value. Arrange things so the extra bits will be set to zero if and
5992 only if C is signed-extended to its full width. If MASK is nonzero,
5993 it is an INTEGER_CST that should be AND'ed with the extra bits. */
5996 unextend (tree c
, int p
, int unsignedp
, tree mask
)
5998 tree type
= TREE_TYPE (c
);
5999 int modesize
= GET_MODE_BITSIZE (SCALAR_INT_TYPE_MODE (type
));
6002 if (p
== modesize
|| unsignedp
)
6005 /* We work by getting just the sign bit into the low-order bit, then
6006 into the high-order bit, then sign-extend. We then XOR that value
6008 temp
= build_int_cst (TREE_TYPE (c
),
6009 wi::extract_uhwi (wi::to_wide (c
), p
- 1, 1));
6011 /* We must use a signed type in order to get an arithmetic right shift.
6012 However, we must also avoid introducing accidental overflows, so that
6013 a subsequent call to integer_zerop will work. Hence we must
6014 do the type conversion here. At this point, the constant is either
6015 zero or one, and the conversion to a signed type can never overflow.
6016 We could get an overflow if this conversion is done anywhere else. */
6017 if (TYPE_UNSIGNED (type
))
6018 temp
= fold_convert (signed_type_for (type
), temp
);
6020 temp
= const_binop (LSHIFT_EXPR
, temp
, size_int (modesize
- 1));
6021 temp
= const_binop (RSHIFT_EXPR
, temp
, size_int (modesize
- p
- 1));
6023 temp
= const_binop (BIT_AND_EXPR
, temp
,
6024 fold_convert (TREE_TYPE (c
), mask
));
6025 /* If necessary, convert the type back to match the type of C. */
6026 if (TYPE_UNSIGNED (type
))
6027 temp
= fold_convert (type
, temp
);
6029 return fold_convert (type
, const_binop (BIT_XOR_EXPR
, c
, temp
));
6032 /* For an expression that has the form
6036 we can drop one of the inner expressions and simplify to
6040 LOC is the location of the resulting expression. OP is the inner
6041 logical operation; the left-hand side in the examples above, while CMPOP
6042 is the right-hand side. RHS_ONLY is used to prevent us from accidentally
6043 removing a condition that guards another, as in
6044 (A != NULL && A->...) || A == NULL
6045 which we must not transform. If RHS_ONLY is true, only eliminate the
6046 right-most operand of the inner logical operation. */
6049 merge_truthop_with_opposite_arm (location_t loc
, tree op
, tree cmpop
,
6052 tree type
= TREE_TYPE (cmpop
);
6053 enum tree_code code
= TREE_CODE (cmpop
);
6054 enum tree_code truthop_code
= TREE_CODE (op
);
6055 tree lhs
= TREE_OPERAND (op
, 0);
6056 tree rhs
= TREE_OPERAND (op
, 1);
6057 tree orig_lhs
= lhs
, orig_rhs
= rhs
;
6058 enum tree_code rhs_code
= TREE_CODE (rhs
);
6059 enum tree_code lhs_code
= TREE_CODE (lhs
);
6060 enum tree_code inv_code
;
6062 if (TREE_SIDE_EFFECTS (op
) || TREE_SIDE_EFFECTS (cmpop
))
6065 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
6068 if (rhs_code
== truthop_code
)
6070 tree newrhs
= merge_truthop_with_opposite_arm (loc
, rhs
, cmpop
, rhs_only
);
6071 if (newrhs
!= NULL_TREE
)
6074 rhs_code
= TREE_CODE (rhs
);
6077 if (lhs_code
== truthop_code
&& !rhs_only
)
6079 tree newlhs
= merge_truthop_with_opposite_arm (loc
, lhs
, cmpop
, false);
6080 if (newlhs
!= NULL_TREE
)
6083 lhs_code
= TREE_CODE (lhs
);
6087 inv_code
= invert_tree_comparison (code
, HONOR_NANS (type
));
6088 if (inv_code
== rhs_code
6089 && operand_equal_p (TREE_OPERAND (rhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
6090 && operand_equal_p (TREE_OPERAND (rhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
6092 if (!rhs_only
&& inv_code
== lhs_code
6093 && operand_equal_p (TREE_OPERAND (lhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
6094 && operand_equal_p (TREE_OPERAND (lhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
6096 if (rhs
!= orig_rhs
|| lhs
!= orig_lhs
)
6097 return fold_build2_loc (loc
, truthop_code
, TREE_TYPE (cmpop
),
6102 /* Find ways of folding logical expressions of LHS and RHS:
6103 Try to merge two comparisons to the same innermost item.
6104 Look for range tests like "ch >= '0' && ch <= '9'".
6105 Look for combinations of simple terms on machines with expensive branches
6106 and evaluate the RHS unconditionally.
6108 For example, if we have p->a == 2 && p->b == 4 and we can make an
6109 object large enough to span both A and B, we can do this with a comparison
6110 against the object ANDed with the a mask.
6112 If we have p->a == q->a && p->b == q->b, we may be able to use bit masking
6113 operations to do this with one comparison.
6115 We check for both normal comparisons and the BIT_AND_EXPRs made this by
6116 function and the one above.
6118 CODE is the logical operation being done. It can be TRUTH_ANDIF_EXPR,
6119 TRUTH_AND_EXPR, TRUTH_ORIF_EXPR, or TRUTH_OR_EXPR.
6121 TRUTH_TYPE is the type of the logical operand and LHS and RHS are its
6124 We return the simplified tree or 0 if no optimization is possible. */
6127 fold_truth_andor_1 (location_t loc
, enum tree_code code
, tree truth_type
,
6130 /* If this is the "or" of two comparisons, we can do something if
6131 the comparisons are NE_EXPR. If this is the "and", we can do something
6132 if the comparisons are EQ_EXPR. I.e.,
6133 (a->b == 2 && a->c == 4) can become (a->new == NEW).
6135 WANTED_CODE is this operation code. For single bit fields, we can
6136 convert EQ_EXPR to NE_EXPR so we need not reject the "wrong"
6137 comparison for one-bit fields. */
6139 enum tree_code wanted_code
;
6140 enum tree_code lcode
, rcode
;
6141 tree ll_arg
, lr_arg
, rl_arg
, rr_arg
;
6142 tree ll_inner
, lr_inner
, rl_inner
, rr_inner
;
6143 HOST_WIDE_INT ll_bitsize
, ll_bitpos
, lr_bitsize
, lr_bitpos
;
6144 HOST_WIDE_INT rl_bitsize
, rl_bitpos
, rr_bitsize
, rr_bitpos
;
6145 HOST_WIDE_INT xll_bitpos
, xlr_bitpos
, xrl_bitpos
, xrr_bitpos
;
6146 HOST_WIDE_INT lnbitsize
, lnbitpos
, rnbitsize
, rnbitpos
;
6147 int ll_unsignedp
, lr_unsignedp
, rl_unsignedp
, rr_unsignedp
;
6148 int ll_reversep
, lr_reversep
, rl_reversep
, rr_reversep
;
6149 machine_mode ll_mode
, lr_mode
, rl_mode
, rr_mode
;
6150 scalar_int_mode lnmode
, rnmode
;
6151 tree ll_mask
, lr_mask
, rl_mask
, rr_mask
;
6152 tree ll_and_mask
, lr_and_mask
, rl_and_mask
, rr_and_mask
;
6153 tree l_const
, r_const
;
6154 tree lntype
, rntype
, result
;
6155 HOST_WIDE_INT first_bit
, end_bit
;
6158 /* Start by getting the comparison codes. Fail if anything is volatile.
6159 If one operand is a BIT_AND_EXPR with the constant one, treat it as if
6160 it were surrounded with a NE_EXPR. */
6162 if (TREE_SIDE_EFFECTS (lhs
) || TREE_SIDE_EFFECTS (rhs
))
6165 lcode
= TREE_CODE (lhs
);
6166 rcode
= TREE_CODE (rhs
);
6168 if (lcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (lhs
, 1)))
6170 lhs
= build2 (NE_EXPR
, truth_type
, lhs
,
6171 build_int_cst (TREE_TYPE (lhs
), 0));
6175 if (rcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (rhs
, 1)))
6177 rhs
= build2 (NE_EXPR
, truth_type
, rhs
,
6178 build_int_cst (TREE_TYPE (rhs
), 0));
6182 if (TREE_CODE_CLASS (lcode
) != tcc_comparison
6183 || TREE_CODE_CLASS (rcode
) != tcc_comparison
)
6186 ll_arg
= TREE_OPERAND (lhs
, 0);
6187 lr_arg
= TREE_OPERAND (lhs
, 1);
6188 rl_arg
= TREE_OPERAND (rhs
, 0);
6189 rr_arg
= TREE_OPERAND (rhs
, 1);
6191 /* Simplify (x<y) && (x==y) into (x<=y) and related optimizations. */
6192 if (simple_operand_p (ll_arg
)
6193 && simple_operand_p (lr_arg
))
6195 if (operand_equal_p (ll_arg
, rl_arg
, 0)
6196 && operand_equal_p (lr_arg
, rr_arg
, 0))
6198 result
= combine_comparisons (loc
, code
, lcode
, rcode
,
6199 truth_type
, ll_arg
, lr_arg
);
6203 else if (operand_equal_p (ll_arg
, rr_arg
, 0)
6204 && operand_equal_p (lr_arg
, rl_arg
, 0))
6206 result
= combine_comparisons (loc
, code
, lcode
,
6207 swap_tree_comparison (rcode
),
6208 truth_type
, ll_arg
, lr_arg
);
6214 code
= ((code
== TRUTH_AND_EXPR
|| code
== TRUTH_ANDIF_EXPR
)
6215 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
);
6217 /* If the RHS can be evaluated unconditionally and its operands are
6218 simple, it wins to evaluate the RHS unconditionally on machines
6219 with expensive branches. In this case, this isn't a comparison
6220 that can be merged. */
6222 if (BRANCH_COST (optimize_function_for_speed_p (cfun
),
6224 && ! FLOAT_TYPE_P (TREE_TYPE (rl_arg
))
6225 && simple_operand_p (rl_arg
)
6226 && simple_operand_p (rr_arg
))
6228 /* Convert (a != 0) || (b != 0) into (a | b) != 0. */
6229 if (code
== TRUTH_OR_EXPR
6230 && lcode
== NE_EXPR
&& integer_zerop (lr_arg
)
6231 && rcode
== NE_EXPR
&& integer_zerop (rr_arg
)
6232 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
6233 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
6234 return build2_loc (loc
, NE_EXPR
, truth_type
,
6235 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
6237 build_int_cst (TREE_TYPE (ll_arg
), 0));
6239 /* Convert (a == 0) && (b == 0) into (a | b) == 0. */
6240 if (code
== TRUTH_AND_EXPR
6241 && lcode
== EQ_EXPR
&& integer_zerop (lr_arg
)
6242 && rcode
== EQ_EXPR
&& integer_zerop (rr_arg
)
6243 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
6244 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
6245 return build2_loc (loc
, EQ_EXPR
, truth_type
,
6246 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
6248 build_int_cst (TREE_TYPE (ll_arg
), 0));
6251 /* See if the comparisons can be merged. Then get all the parameters for
6254 if ((lcode
!= EQ_EXPR
&& lcode
!= NE_EXPR
)
6255 || (rcode
!= EQ_EXPR
&& rcode
!= NE_EXPR
))
6258 ll_reversep
= lr_reversep
= rl_reversep
= rr_reversep
= 0;
6260 ll_inner
= decode_field_reference (loc
, &ll_arg
,
6261 &ll_bitsize
, &ll_bitpos
, &ll_mode
,
6262 &ll_unsignedp
, &ll_reversep
, &volatilep
,
6263 &ll_mask
, &ll_and_mask
);
6264 lr_inner
= decode_field_reference (loc
, &lr_arg
,
6265 &lr_bitsize
, &lr_bitpos
, &lr_mode
,
6266 &lr_unsignedp
, &lr_reversep
, &volatilep
,
6267 &lr_mask
, &lr_and_mask
);
6268 rl_inner
= decode_field_reference (loc
, &rl_arg
,
6269 &rl_bitsize
, &rl_bitpos
, &rl_mode
,
6270 &rl_unsignedp
, &rl_reversep
, &volatilep
,
6271 &rl_mask
, &rl_and_mask
);
6272 rr_inner
= decode_field_reference (loc
, &rr_arg
,
6273 &rr_bitsize
, &rr_bitpos
, &rr_mode
,
6274 &rr_unsignedp
, &rr_reversep
, &volatilep
,
6275 &rr_mask
, &rr_and_mask
);
6277 /* It must be true that the inner operation on the lhs of each
6278 comparison must be the same if we are to be able to do anything.
6279 Then see if we have constants. If not, the same must be true for
6282 || ll_reversep
!= rl_reversep
6283 || ll_inner
== 0 || rl_inner
== 0
6284 || ! operand_equal_p (ll_inner
, rl_inner
, 0))
6287 if (TREE_CODE (lr_arg
) == INTEGER_CST
6288 && TREE_CODE (rr_arg
) == INTEGER_CST
)
6290 l_const
= lr_arg
, r_const
= rr_arg
;
6291 lr_reversep
= ll_reversep
;
6293 else if (lr_reversep
!= rr_reversep
6294 || lr_inner
== 0 || rr_inner
== 0
6295 || ! operand_equal_p (lr_inner
, rr_inner
, 0))
6298 l_const
= r_const
= 0;
6300 /* If either comparison code is not correct for our logical operation,
6301 fail. However, we can convert a one-bit comparison against zero into
6302 the opposite comparison against that bit being set in the field. */
6304 wanted_code
= (code
== TRUTH_AND_EXPR
? EQ_EXPR
: NE_EXPR
);
6305 if (lcode
!= wanted_code
)
6307 if (l_const
&& integer_zerop (l_const
) && integer_pow2p (ll_mask
))
6309 /* Make the left operand unsigned, since we are only interested
6310 in the value of one bit. Otherwise we are doing the wrong
6319 /* This is analogous to the code for l_const above. */
6320 if (rcode
!= wanted_code
)
6322 if (r_const
&& integer_zerop (r_const
) && integer_pow2p (rl_mask
))
6331 /* See if we can find a mode that contains both fields being compared on
6332 the left. If we can't, fail. Otherwise, update all constants and masks
6333 to be relative to a field of that size. */
6334 first_bit
= MIN (ll_bitpos
, rl_bitpos
);
6335 end_bit
= MAX (ll_bitpos
+ ll_bitsize
, rl_bitpos
+ rl_bitsize
);
6336 if (!get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
6337 TYPE_ALIGN (TREE_TYPE (ll_inner
)), BITS_PER_WORD
,
6338 volatilep
, &lnmode
))
6341 lnbitsize
= GET_MODE_BITSIZE (lnmode
);
6342 lnbitpos
= first_bit
& ~ (lnbitsize
- 1);
6343 lntype
= lang_hooks
.types
.type_for_size (lnbitsize
, 1);
6344 xll_bitpos
= ll_bitpos
- lnbitpos
, xrl_bitpos
= rl_bitpos
- lnbitpos
;
6346 if (ll_reversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
6348 xll_bitpos
= lnbitsize
- xll_bitpos
- ll_bitsize
;
6349 xrl_bitpos
= lnbitsize
- xrl_bitpos
- rl_bitsize
;
6352 ll_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, ll_mask
),
6353 size_int (xll_bitpos
));
6354 rl_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, rl_mask
),
6355 size_int (xrl_bitpos
));
6359 l_const
= fold_convert_loc (loc
, lntype
, l_const
);
6360 l_const
= unextend (l_const
, ll_bitsize
, ll_unsignedp
, ll_and_mask
);
6361 l_const
= const_binop (LSHIFT_EXPR
, l_const
, size_int (xll_bitpos
));
6362 if (! integer_zerop (const_binop (BIT_AND_EXPR
, l_const
,
6363 fold_build1_loc (loc
, BIT_NOT_EXPR
,
6366 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
6368 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
6373 r_const
= fold_convert_loc (loc
, lntype
, r_const
);
6374 r_const
= unextend (r_const
, rl_bitsize
, rl_unsignedp
, rl_and_mask
);
6375 r_const
= const_binop (LSHIFT_EXPR
, r_const
, size_int (xrl_bitpos
));
6376 if (! integer_zerop (const_binop (BIT_AND_EXPR
, r_const
,
6377 fold_build1_loc (loc
, BIT_NOT_EXPR
,
6380 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
6382 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
6386 /* If the right sides are not constant, do the same for it. Also,
6387 disallow this optimization if a size, signedness or storage order
6388 mismatch occurs between the left and right sides. */
6391 if (ll_bitsize
!= lr_bitsize
|| rl_bitsize
!= rr_bitsize
6392 || ll_unsignedp
!= lr_unsignedp
|| rl_unsignedp
!= rr_unsignedp
6393 || ll_reversep
!= lr_reversep
6394 /* Make sure the two fields on the right
6395 correspond to the left without being swapped. */
6396 || ll_bitpos
- rl_bitpos
!= lr_bitpos
- rr_bitpos
)
6399 first_bit
= MIN (lr_bitpos
, rr_bitpos
);
6400 end_bit
= MAX (lr_bitpos
+ lr_bitsize
, rr_bitpos
+ rr_bitsize
);
6401 if (!get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
6402 TYPE_ALIGN (TREE_TYPE (lr_inner
)), BITS_PER_WORD
,
6403 volatilep
, &rnmode
))
6406 rnbitsize
= GET_MODE_BITSIZE (rnmode
);
6407 rnbitpos
= first_bit
& ~ (rnbitsize
- 1);
6408 rntype
= lang_hooks
.types
.type_for_size (rnbitsize
, 1);
6409 xlr_bitpos
= lr_bitpos
- rnbitpos
, xrr_bitpos
= rr_bitpos
- rnbitpos
;
6411 if (lr_reversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
6413 xlr_bitpos
= rnbitsize
- xlr_bitpos
- lr_bitsize
;
6414 xrr_bitpos
= rnbitsize
- xrr_bitpos
- rr_bitsize
;
6417 lr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
6419 size_int (xlr_bitpos
));
6420 rr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
6422 size_int (xrr_bitpos
));
6424 /* Make a mask that corresponds to both fields being compared.
6425 Do this for both items being compared. If the operands are the
6426 same size and the bits being compared are in the same position
6427 then we can do this by masking both and comparing the masked
6429 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
6430 lr_mask
= const_binop (BIT_IOR_EXPR
, lr_mask
, rr_mask
);
6431 if (lnbitsize
== rnbitsize
6432 && xll_bitpos
== xlr_bitpos
6436 lhs
= make_bit_field_ref (loc
, ll_inner
, ll_arg
,
6437 lntype
, lnbitsize
, lnbitpos
,
6438 ll_unsignedp
|| rl_unsignedp
, ll_reversep
);
6439 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
6440 lhs
= build2 (BIT_AND_EXPR
, lntype
, lhs
, ll_mask
);
6442 rhs
= make_bit_field_ref (loc
, lr_inner
, lr_arg
,
6443 rntype
, rnbitsize
, rnbitpos
,
6444 lr_unsignedp
|| rr_unsignedp
, lr_reversep
);
6445 if (! all_ones_mask_p (lr_mask
, rnbitsize
))
6446 rhs
= build2 (BIT_AND_EXPR
, rntype
, rhs
, lr_mask
);
6448 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
6451 /* There is still another way we can do something: If both pairs of
6452 fields being compared are adjacent, we may be able to make a wider
6453 field containing them both.
6455 Note that we still must mask the lhs/rhs expressions. Furthermore,
6456 the mask must be shifted to account for the shift done by
6457 make_bit_field_ref. */
6458 if (((ll_bitsize
+ ll_bitpos
== rl_bitpos
6459 && lr_bitsize
+ lr_bitpos
== rr_bitpos
)
6460 || (ll_bitpos
== rl_bitpos
+ rl_bitsize
6461 && lr_bitpos
== rr_bitpos
+ rr_bitsize
))
6469 lhs
= make_bit_field_ref (loc
, ll_inner
, ll_arg
, lntype
,
6470 ll_bitsize
+ rl_bitsize
,
6471 MIN (ll_bitpos
, rl_bitpos
),
6472 ll_unsignedp
, ll_reversep
);
6473 rhs
= make_bit_field_ref (loc
, lr_inner
, lr_arg
, rntype
,
6474 lr_bitsize
+ rr_bitsize
,
6475 MIN (lr_bitpos
, rr_bitpos
),
6476 lr_unsignedp
, lr_reversep
);
6478 ll_mask
= const_binop (RSHIFT_EXPR
, ll_mask
,
6479 size_int (MIN (xll_bitpos
, xrl_bitpos
)));
6480 lr_mask
= const_binop (RSHIFT_EXPR
, lr_mask
,
6481 size_int (MIN (xlr_bitpos
, xrr_bitpos
)));
6483 /* Convert to the smaller type before masking out unwanted bits. */
6485 if (lntype
!= rntype
)
6487 if (lnbitsize
> rnbitsize
)
6489 lhs
= fold_convert_loc (loc
, rntype
, lhs
);
6490 ll_mask
= fold_convert_loc (loc
, rntype
, ll_mask
);
6493 else if (lnbitsize
< rnbitsize
)
6495 rhs
= fold_convert_loc (loc
, lntype
, rhs
);
6496 lr_mask
= fold_convert_loc (loc
, lntype
, lr_mask
);
6501 if (! all_ones_mask_p (ll_mask
, ll_bitsize
+ rl_bitsize
))
6502 lhs
= build2 (BIT_AND_EXPR
, type
, lhs
, ll_mask
);
6504 if (! all_ones_mask_p (lr_mask
, lr_bitsize
+ rr_bitsize
))
6505 rhs
= build2 (BIT_AND_EXPR
, type
, rhs
, lr_mask
);
6507 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
6513 /* Handle the case of comparisons with constants. If there is something in
6514 common between the masks, those bits of the constants must be the same.
6515 If not, the condition is always false. Test for this to avoid generating
6516 incorrect code below. */
6517 result
= const_binop (BIT_AND_EXPR
, ll_mask
, rl_mask
);
6518 if (! integer_zerop (result
)
6519 && simple_cst_equal (const_binop (BIT_AND_EXPR
, result
, l_const
),
6520 const_binop (BIT_AND_EXPR
, result
, r_const
)) != 1)
6522 if (wanted_code
== NE_EXPR
)
6524 warning (0, "%<or%> of unmatched not-equal tests is always 1");
6525 return constant_boolean_node (true, truth_type
);
6529 warning (0, "%<and%> of mutually exclusive equal-tests is always 0");
6530 return constant_boolean_node (false, truth_type
);
6537 /* Construct the expression we will return. First get the component
6538 reference we will make. Unless the mask is all ones the width of
6539 that field, perform the mask operation. Then compare with the
6541 result
= make_bit_field_ref (loc
, ll_inner
, ll_arg
,
6542 lntype
, lnbitsize
, lnbitpos
,
6543 ll_unsignedp
|| rl_unsignedp
, ll_reversep
);
6545 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
6546 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
6547 result
= build2_loc (loc
, BIT_AND_EXPR
, lntype
, result
, ll_mask
);
6549 return build2_loc (loc
, wanted_code
, truth_type
, result
,
6550 const_binop (BIT_IOR_EXPR
, l_const
, r_const
));
6553 /* T is an integer expression that is being multiplied, divided, or taken a
6554 modulus (CODE says which and what kind of divide or modulus) by a
6555 constant C. See if we can eliminate that operation by folding it with
6556 other operations already in T. WIDE_TYPE, if non-null, is a type that
6557 should be used for the computation if wider than our type.
6559 For example, if we are dividing (X * 8) + (Y * 16) by 4, we can return
6560 (X * 2) + (Y * 4). We must, however, be assured that either the original
6561 expression would not overflow or that overflow is undefined for the type
6562 in the language in question.
6564 If we return a non-null expression, it is an equivalent form of the
6565 original computation, but need not be in the original type.
6567 We set *STRICT_OVERFLOW_P to true if the return values depends on
6568 signed overflow being undefined. Otherwise we do not change
6569 *STRICT_OVERFLOW_P. */
6572 extract_muldiv (tree t
, tree c
, enum tree_code code
, tree wide_type
,
6573 bool *strict_overflow_p
)
6575 /* To avoid exponential search depth, refuse to allow recursion past
6576 three levels. Beyond that (1) it's highly unlikely that we'll find
6577 something interesting and (2) we've probably processed it before
6578 when we built the inner expression. */
6587 ret
= extract_muldiv_1 (t
, c
, code
, wide_type
, strict_overflow_p
);
6594 extract_muldiv_1 (tree t
, tree c
, enum tree_code code
, tree wide_type
,
6595 bool *strict_overflow_p
)
6597 tree type
= TREE_TYPE (t
);
6598 enum tree_code tcode
= TREE_CODE (t
);
6599 tree ctype
= (wide_type
!= 0
6600 && (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (wide_type
))
6601 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type
)))
6602 ? wide_type
: type
);
6604 int same_p
= tcode
== code
;
6605 tree op0
= NULL_TREE
, op1
= NULL_TREE
;
6606 bool sub_strict_overflow_p
;
6608 /* Don't deal with constants of zero here; they confuse the code below. */
6609 if (integer_zerop (c
))
6612 if (TREE_CODE_CLASS (tcode
) == tcc_unary
)
6613 op0
= TREE_OPERAND (t
, 0);
6615 if (TREE_CODE_CLASS (tcode
) == tcc_binary
)
6616 op0
= TREE_OPERAND (t
, 0), op1
= TREE_OPERAND (t
, 1);
6618 /* Note that we need not handle conditional operations here since fold
6619 already handles those cases. So just do arithmetic here. */
6623 /* For a constant, we can always simplify if we are a multiply
6624 or (for divide and modulus) if it is a multiple of our constant. */
6625 if (code
== MULT_EXPR
6626 || wi::multiple_of_p (wi::to_wide (t
), wi::to_wide (c
),
6629 tree tem
= const_binop (code
, fold_convert (ctype
, t
),
6630 fold_convert (ctype
, c
));
6631 /* If the multiplication overflowed, we lost information on it.
6632 See PR68142 and PR69845. */
6633 if (TREE_OVERFLOW (tem
))
6639 CASE_CONVERT
: case NON_LVALUE_EXPR
:
6640 /* If op0 is an expression ... */
6641 if ((COMPARISON_CLASS_P (op0
)
6642 || UNARY_CLASS_P (op0
)
6643 || BINARY_CLASS_P (op0
)
6644 || VL_EXP_CLASS_P (op0
)
6645 || EXPRESSION_CLASS_P (op0
))
6646 /* ... and has wrapping overflow, and its type is smaller
6647 than ctype, then we cannot pass through as widening. */
6648 && (((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
6649 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (op0
)))
6650 && (TYPE_PRECISION (ctype
)
6651 > TYPE_PRECISION (TREE_TYPE (op0
))))
6652 /* ... or this is a truncation (t is narrower than op0),
6653 then we cannot pass through this narrowing. */
6654 || (TYPE_PRECISION (type
)
6655 < TYPE_PRECISION (TREE_TYPE (op0
)))
6656 /* ... or signedness changes for division or modulus,
6657 then we cannot pass through this conversion. */
6658 || (code
!= MULT_EXPR
6659 && (TYPE_UNSIGNED (ctype
)
6660 != TYPE_UNSIGNED (TREE_TYPE (op0
))))
6661 /* ... or has undefined overflow while the converted to
6662 type has not, we cannot do the operation in the inner type
6663 as that would introduce undefined overflow. */
6664 || ((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
6665 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (op0
)))
6666 && !TYPE_OVERFLOW_UNDEFINED (type
))))
6669 /* Pass the constant down and see if we can make a simplification. If
6670 we can, replace this expression with the inner simplification for
6671 possible later conversion to our or some other type. */
6672 if ((t2
= fold_convert (TREE_TYPE (op0
), c
)) != 0
6673 && TREE_CODE (t2
) == INTEGER_CST
6674 && !TREE_OVERFLOW (t2
)
6675 && (t1
= extract_muldiv (op0
, t2
, code
,
6676 code
== MULT_EXPR
? ctype
: NULL_TREE
,
6677 strict_overflow_p
)) != 0)
6682 /* If widening the type changes it from signed to unsigned, then we
6683 must avoid building ABS_EXPR itself as unsigned. */
6684 if (TYPE_UNSIGNED (ctype
) && !TYPE_UNSIGNED (type
))
6686 tree cstype
= (*signed_type_for
) (ctype
);
6687 if ((t1
= extract_muldiv (op0
, c
, code
, cstype
, strict_overflow_p
))
6690 t1
= fold_build1 (tcode
, cstype
, fold_convert (cstype
, t1
));
6691 return fold_convert (ctype
, t1
);
6695 /* If the constant is negative, we cannot simplify this. */
6696 if (tree_int_cst_sgn (c
) == -1)
6700 /* For division and modulus, type can't be unsigned, as e.g.
6701 (-(x / 2U)) / 2U isn't equal to -((x / 2U) / 2U) for x >= 2.
6702 For signed types, even with wrapping overflow, this is fine. */
6703 if (code
!= MULT_EXPR
&& TYPE_UNSIGNED (type
))
6705 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
, strict_overflow_p
))
6707 return fold_build1 (tcode
, ctype
, fold_convert (ctype
, t1
));
6710 case MIN_EXPR
: case MAX_EXPR
:
6711 /* If widening the type changes the signedness, then we can't perform
6712 this optimization as that changes the result. */
6713 if (TYPE_UNSIGNED (ctype
) != TYPE_UNSIGNED (type
))
6716 /* MIN (a, b) / 5 -> MIN (a / 5, b / 5) */
6717 sub_strict_overflow_p
= false;
6718 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6719 &sub_strict_overflow_p
)) != 0
6720 && (t2
= extract_muldiv (op1
, c
, code
, wide_type
,
6721 &sub_strict_overflow_p
)) != 0)
6723 if (tree_int_cst_sgn (c
) < 0)
6724 tcode
= (tcode
== MIN_EXPR
? MAX_EXPR
: MIN_EXPR
);
6725 if (sub_strict_overflow_p
)
6726 *strict_overflow_p
= true;
6727 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6728 fold_convert (ctype
, t2
));
6732 case LSHIFT_EXPR
: case RSHIFT_EXPR
:
6733 /* If the second operand is constant, this is a multiplication
6734 or floor division, by a power of two, so we can treat it that
6735 way unless the multiplier or divisor overflows. Signed
6736 left-shift overflow is implementation-defined rather than
6737 undefined in C90, so do not convert signed left shift into
6739 if (TREE_CODE (op1
) == INTEGER_CST
6740 && (tcode
== RSHIFT_EXPR
|| TYPE_UNSIGNED (TREE_TYPE (op0
)))
6741 /* const_binop may not detect overflow correctly,
6742 so check for it explicitly here. */
6743 && wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)),
6745 && (t1
= fold_convert (ctype
,
6746 const_binop (LSHIFT_EXPR
, size_one_node
,
6748 && !TREE_OVERFLOW (t1
))
6749 return extract_muldiv (build2 (tcode
== LSHIFT_EXPR
6750 ? MULT_EXPR
: FLOOR_DIV_EXPR
,
6752 fold_convert (ctype
, op0
),
6754 c
, code
, wide_type
, strict_overflow_p
);
6757 case PLUS_EXPR
: case MINUS_EXPR
:
6758 /* See if we can eliminate the operation on both sides. If we can, we
6759 can return a new PLUS or MINUS. If we can't, the only remaining
6760 cases where we can do anything are if the second operand is a
6762 sub_strict_overflow_p
= false;
6763 t1
= extract_muldiv (op0
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6764 t2
= extract_muldiv (op1
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6765 if (t1
!= 0 && t2
!= 0
6766 && TYPE_OVERFLOW_WRAPS (ctype
)
6767 && (code
== MULT_EXPR
6768 /* If not multiplication, we can only do this if both operands
6769 are divisible by c. */
6770 || (multiple_of_p (ctype
, op0
, c
)
6771 && multiple_of_p (ctype
, op1
, c
))))
6773 if (sub_strict_overflow_p
)
6774 *strict_overflow_p
= true;
6775 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6776 fold_convert (ctype
, t2
));
6779 /* If this was a subtraction, negate OP1 and set it to be an addition.
6780 This simplifies the logic below. */
6781 if (tcode
== MINUS_EXPR
)
6783 tcode
= PLUS_EXPR
, op1
= negate_expr (op1
);
6784 /* If OP1 was not easily negatable, the constant may be OP0. */
6785 if (TREE_CODE (op0
) == INTEGER_CST
)
6787 std::swap (op0
, op1
);
6792 if (TREE_CODE (op1
) != INTEGER_CST
)
6795 /* If either OP1 or C are negative, this optimization is not safe for
6796 some of the division and remainder types while for others we need
6797 to change the code. */
6798 if (tree_int_cst_sgn (op1
) < 0 || tree_int_cst_sgn (c
) < 0)
6800 if (code
== CEIL_DIV_EXPR
)
6801 code
= FLOOR_DIV_EXPR
;
6802 else if (code
== FLOOR_DIV_EXPR
)
6803 code
= CEIL_DIV_EXPR
;
6804 else if (code
!= MULT_EXPR
6805 && code
!= CEIL_MOD_EXPR
&& code
!= FLOOR_MOD_EXPR
)
6809 /* If it's a multiply or a division/modulus operation of a multiple
6810 of our constant, do the operation and verify it doesn't overflow. */
6811 if (code
== MULT_EXPR
6812 || wi::multiple_of_p (wi::to_wide (op1
), wi::to_wide (c
),
6815 op1
= const_binop (code
, fold_convert (ctype
, op1
),
6816 fold_convert (ctype
, c
));
6817 /* We allow the constant to overflow with wrapping semantics. */
6819 || (TREE_OVERFLOW (op1
) && !TYPE_OVERFLOW_WRAPS (ctype
)))
6825 /* If we have an unsigned type, we cannot widen the operation since it
6826 will change the result if the original computation overflowed. */
6827 if (TYPE_UNSIGNED (ctype
) && ctype
!= type
)
6830 /* The last case is if we are a multiply. In that case, we can
6831 apply the distributive law to commute the multiply and addition
6832 if the multiplication of the constants doesn't overflow
6833 and overflow is defined. With undefined overflow
6834 op0 * c might overflow, while (op0 + orig_op1) * c doesn't.
6835 But fold_plusminus_mult_expr would factor back any power-of-two
6836 value so do not distribute in the first place in this case. */
6837 if (code
== MULT_EXPR
6838 && TYPE_OVERFLOW_WRAPS (ctype
)
6839 && !(tree_fits_shwi_p (c
) && pow2p_hwi (absu_hwi (tree_to_shwi (c
)))))
6840 return fold_build2 (tcode
, ctype
,
6841 fold_build2 (code
, ctype
,
6842 fold_convert (ctype
, op0
),
6843 fold_convert (ctype
, c
)),
6849 /* We have a special case here if we are doing something like
6850 (C * 8) % 4 since we know that's zero. */
6851 if ((code
== TRUNC_MOD_EXPR
|| code
== CEIL_MOD_EXPR
6852 || code
== FLOOR_MOD_EXPR
|| code
== ROUND_MOD_EXPR
)
6853 /* If the multiplication can overflow we cannot optimize this. */
6854 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (t
))
6855 && TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
6856 && wi::multiple_of_p (wi::to_wide (op1
), wi::to_wide (c
),
6859 *strict_overflow_p
= true;
6860 return omit_one_operand (type
, integer_zero_node
, op0
);
6863 /* ... fall through ... */
6865 case TRUNC_DIV_EXPR
: case CEIL_DIV_EXPR
: case FLOOR_DIV_EXPR
:
6866 case ROUND_DIV_EXPR
: case EXACT_DIV_EXPR
:
6867 /* If we can extract our operation from the LHS, do so and return a
6868 new operation. Likewise for the RHS from a MULT_EXPR. Otherwise,
6869 do something only if the second operand is a constant. */
6871 && TYPE_OVERFLOW_WRAPS (ctype
)
6872 && (t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6873 strict_overflow_p
)) != 0)
6874 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6875 fold_convert (ctype
, op1
));
6876 else if (tcode
== MULT_EXPR
&& code
== MULT_EXPR
6877 && TYPE_OVERFLOW_WRAPS (ctype
)
6878 && (t1
= extract_muldiv (op1
, c
, code
, wide_type
,
6879 strict_overflow_p
)) != 0)
6880 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6881 fold_convert (ctype
, t1
));
6882 else if (TREE_CODE (op1
) != INTEGER_CST
)
6885 /* If these are the same operation types, we can associate them
6886 assuming no overflow. */
6889 bool overflow_p
= false;
6890 wi::overflow_type overflow_mul
;
6891 signop sign
= TYPE_SIGN (ctype
);
6892 unsigned prec
= TYPE_PRECISION (ctype
);
6893 wide_int mul
= wi::mul (wi::to_wide (op1
, prec
),
6894 wi::to_wide (c
, prec
),
6895 sign
, &overflow_mul
);
6896 overflow_p
= TREE_OVERFLOW (c
) | TREE_OVERFLOW (op1
);
6898 && ((sign
== UNSIGNED
&& tcode
!= MULT_EXPR
) || sign
== SIGNED
))
6901 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6902 wide_int_to_tree (ctype
, mul
));
6905 /* If these operations "cancel" each other, we have the main
6906 optimizations of this pass, which occur when either constant is a
6907 multiple of the other, in which case we replace this with either an
6908 operation or CODE or TCODE.
6910 If we have an unsigned type, we cannot do this since it will change
6911 the result if the original computation overflowed. */
6912 if (TYPE_OVERFLOW_UNDEFINED (ctype
)
6913 && ((code
== MULT_EXPR
&& tcode
== EXACT_DIV_EXPR
)
6914 || (tcode
== MULT_EXPR
6915 && code
!= TRUNC_MOD_EXPR
&& code
!= CEIL_MOD_EXPR
6916 && code
!= FLOOR_MOD_EXPR
&& code
!= ROUND_MOD_EXPR
6917 && code
!= MULT_EXPR
)))
6919 if (wi::multiple_of_p (wi::to_wide (op1
), wi::to_wide (c
),
6922 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6923 *strict_overflow_p
= true;
6924 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6925 fold_convert (ctype
,
6926 const_binop (TRUNC_DIV_EXPR
,
6929 else if (wi::multiple_of_p (wi::to_wide (c
), wi::to_wide (op1
),
6932 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6933 *strict_overflow_p
= true;
6934 return fold_build2 (code
, ctype
, fold_convert (ctype
, op0
),
6935 fold_convert (ctype
,
6936 const_binop (TRUNC_DIV_EXPR
,
6949 /* Return a node which has the indicated constant VALUE (either 0 or
6950 1 for scalars or {-1,-1,..} or {0,0,...} for vectors),
6951 and is of the indicated TYPE. */
6954 constant_boolean_node (bool value
, tree type
)
6956 if (type
== integer_type_node
)
6957 return value
? integer_one_node
: integer_zero_node
;
6958 else if (type
== boolean_type_node
)
6959 return value
? boolean_true_node
: boolean_false_node
;
6960 else if (TREE_CODE (type
) == VECTOR_TYPE
)
6961 return build_vector_from_val (type
,
6962 build_int_cst (TREE_TYPE (type
),
6965 return fold_convert (type
, value
? integer_one_node
: integer_zero_node
);
6969 /* Transform `a + (b ? x : y)' into `b ? (a + x) : (a + y)'.
6970 Transform, `a + (x < y)' into `(x < y) ? (a + 1) : (a + 0)'. Here
6971 CODE corresponds to the `+', COND to the `(b ? x : y)' or `(x < y)'
6972 expression, and ARG to `a'. If COND_FIRST_P is nonzero, then the
6973 COND is the first argument to CODE; otherwise (as in the example
6974 given here), it is the second argument. TYPE is the type of the
6975 original expression. Return NULL_TREE if no simplification is
6979 fold_binary_op_with_conditional_arg (location_t loc
,
6980 enum tree_code code
,
6981 tree type
, tree op0
, tree op1
,
6982 tree cond
, tree arg
, int cond_first_p
)
6984 tree cond_type
= cond_first_p
? TREE_TYPE (op0
) : TREE_TYPE (op1
);
6985 tree arg_type
= cond_first_p
? TREE_TYPE (op1
) : TREE_TYPE (op0
);
6986 tree test
, true_value
, false_value
;
6987 tree lhs
= NULL_TREE
;
6988 tree rhs
= NULL_TREE
;
6989 enum tree_code cond_code
= COND_EXPR
;
6991 /* Do not move possibly trapping operations into the conditional as this
6992 pessimizes code and causes gimplification issues when applied late. */
6993 if (operation_could_trap_p (code
, FLOAT_TYPE_P (type
),
6994 ANY_INTEGRAL_TYPE_P (type
)
6995 && TYPE_OVERFLOW_TRAPS (type
), op1
))
6998 if (TREE_CODE (cond
) == COND_EXPR
6999 || TREE_CODE (cond
) == VEC_COND_EXPR
)
7001 test
= TREE_OPERAND (cond
, 0);
7002 true_value
= TREE_OPERAND (cond
, 1);
7003 false_value
= TREE_OPERAND (cond
, 2);
7004 /* If this operand throws an expression, then it does not make
7005 sense to try to perform a logical or arithmetic operation
7007 if (VOID_TYPE_P (TREE_TYPE (true_value
)))
7009 if (VOID_TYPE_P (TREE_TYPE (false_value
)))
7012 else if (!(TREE_CODE (type
) != VECTOR_TYPE
7013 && TREE_CODE (TREE_TYPE (cond
)) == VECTOR_TYPE
))
7015 tree testtype
= TREE_TYPE (cond
);
7017 true_value
= constant_boolean_node (true, testtype
);
7018 false_value
= constant_boolean_node (false, testtype
);
7021 /* Detect the case of mixing vector and scalar types - bail out. */
7024 if (TREE_CODE (TREE_TYPE (test
)) == VECTOR_TYPE
)
7025 cond_code
= VEC_COND_EXPR
;
7027 /* This transformation is only worthwhile if we don't have to wrap ARG
7028 in a SAVE_EXPR and the operation can be simplified without recursing
7029 on at least one of the branches once its pushed inside the COND_EXPR. */
7030 if (!TREE_CONSTANT (arg
)
7031 && (TREE_SIDE_EFFECTS (arg
)
7032 || TREE_CODE (arg
) == COND_EXPR
|| TREE_CODE (arg
) == VEC_COND_EXPR
7033 || TREE_CONSTANT (true_value
) || TREE_CONSTANT (false_value
)))
7036 arg
= fold_convert_loc (loc
, arg_type
, arg
);
7039 true_value
= fold_convert_loc (loc
, cond_type
, true_value
);
7041 lhs
= fold_build2_loc (loc
, code
, type
, true_value
, arg
);
7043 lhs
= fold_build2_loc (loc
, code
, type
, arg
, true_value
);
7047 false_value
= fold_convert_loc (loc
, cond_type
, false_value
);
7049 rhs
= fold_build2_loc (loc
, code
, type
, false_value
, arg
);
7051 rhs
= fold_build2_loc (loc
, code
, type
, arg
, false_value
);
7054 /* Check that we have simplified at least one of the branches. */
7055 if (!TREE_CONSTANT (arg
) && !TREE_CONSTANT (lhs
) && !TREE_CONSTANT (rhs
))
7058 return fold_build3_loc (loc
, cond_code
, type
, test
, lhs
, rhs
);
7062 /* Subroutine of fold() that checks for the addition of +/- 0.0.
7064 If !NEGATE, return true if ADDEND is +/-0.0 and, for all X of type
7065 TYPE, X + ADDEND is the same as X. If NEGATE, return true if X -
7066 ADDEND is the same as X.
7068 X + 0 and X - 0 both give X when X is NaN, infinite, or nonzero
7069 and finite. The problematic cases are when X is zero, and its mode
7070 has signed zeros. In the case of rounding towards -infinity,
7071 X - 0 is not the same as X because 0 - 0 is -0. In other rounding
7072 modes, X + 0 is not the same as X because -0 + 0 is 0. */
7075 fold_real_zero_addition_p (const_tree type
, const_tree addend
, int negate
)
7077 if (!real_zerop (addend
))
7080 /* Don't allow the fold with -fsignaling-nans. */
7081 if (HONOR_SNANS (type
))
7084 /* Allow the fold if zeros aren't signed, or their sign isn't important. */
7085 if (!HONOR_SIGNED_ZEROS (type
))
7088 /* There is no case that is safe for all rounding modes. */
7089 if (HONOR_SIGN_DEPENDENT_ROUNDING (type
))
7092 /* In a vector or complex, we would need to check the sign of all zeros. */
7093 if (TREE_CODE (addend
) == VECTOR_CST
)
7094 addend
= uniform_vector_p (addend
);
7095 if (!addend
|| TREE_CODE (addend
) != REAL_CST
)
7098 /* Treat x + -0 as x - 0 and x - -0 as x + 0. */
7099 if (REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (addend
)))
7102 /* The mode has signed zeros, and we have to honor their sign.
7103 In this situation, there is only one case we can return true for.
7104 X - 0 is the same as X with default rounding. */
7108 /* Subroutine of match.pd that optimizes comparisons of a division by
7109 a nonzero integer constant against an integer constant, i.e.
7112 CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR,
7113 GE_EXPR or LE_EXPR. ARG01 and ARG1 must be a INTEGER_CST. */
7116 fold_div_compare (enum tree_code code
, tree c1
, tree c2
, tree
*lo
,
7117 tree
*hi
, bool *neg_overflow
)
7119 tree prod
, tmp
, type
= TREE_TYPE (c1
);
7120 signop sign
= TYPE_SIGN (type
);
7121 wi::overflow_type overflow
;
7123 /* We have to do this the hard way to detect unsigned overflow.
7124 prod = int_const_binop (MULT_EXPR, c1, c2); */
7125 wide_int val
= wi::mul (wi::to_wide (c1
), wi::to_wide (c2
), sign
, &overflow
);
7126 prod
= force_fit_type (type
, val
, -1, overflow
);
7127 *neg_overflow
= false;
7129 if (sign
== UNSIGNED
)
7131 tmp
= int_const_binop (MINUS_EXPR
, c1
, build_int_cst (type
, 1));
7134 /* Likewise *hi = int_const_binop (PLUS_EXPR, prod, tmp). */
7135 val
= wi::add (wi::to_wide (prod
), wi::to_wide (tmp
), sign
, &overflow
);
7136 *hi
= force_fit_type (type
, val
, -1, overflow
| TREE_OVERFLOW (prod
));
7138 else if (tree_int_cst_sgn (c1
) >= 0)
7140 tmp
= int_const_binop (MINUS_EXPR
, c1
, build_int_cst (type
, 1));
7141 switch (tree_int_cst_sgn (c2
))
7144 *neg_overflow
= true;
7145 *lo
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
7150 *lo
= fold_negate_const (tmp
, type
);
7155 *hi
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
7165 /* A negative divisor reverses the relational operators. */
7166 code
= swap_tree_comparison (code
);
7168 tmp
= int_const_binop (PLUS_EXPR
, c1
, build_int_cst (type
, 1));
7169 switch (tree_int_cst_sgn (c2
))
7172 *hi
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
7177 *hi
= fold_negate_const (tmp
, type
);
7182 *neg_overflow
= true;
7183 *lo
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
7192 if (code
!= EQ_EXPR
&& code
!= NE_EXPR
)
7195 if (TREE_OVERFLOW (*lo
)
7196 || operand_equal_p (*lo
, TYPE_MIN_VALUE (type
), 0))
7198 if (TREE_OVERFLOW (*hi
)
7199 || operand_equal_p (*hi
, TYPE_MAX_VALUE (type
), 0))
7206 /* If CODE with arguments ARG0 and ARG1 represents a single bit
7207 equality/inequality test, then return a simplified form of the test
7208 using a sign testing. Otherwise return NULL. TYPE is the desired
7212 fold_single_bit_test_into_sign_test (location_t loc
,
7213 enum tree_code code
, tree arg0
, tree arg1
,
7216 /* If this is testing a single bit, we can optimize the test. */
7217 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
7218 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
7219 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
7221 /* If we have (A & C) != 0 where C is the sign bit of A, convert
7222 this into A < 0. Similarly for (A & C) == 0 into A >= 0. */
7223 tree arg00
= sign_bit_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg0
, 1));
7225 if (arg00
!= NULL_TREE
7226 /* This is only a win if casting to a signed type is cheap,
7227 i.e. when arg00's type is not a partial mode. */
7228 && type_has_mode_precision_p (TREE_TYPE (arg00
)))
7230 tree stype
= signed_type_for (TREE_TYPE (arg00
));
7231 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
7233 fold_convert_loc (loc
, stype
, arg00
),
7234 build_int_cst (stype
, 0));
7241 /* If CODE with arguments ARG0 and ARG1 represents a single bit
7242 equality/inequality test, then return a simplified form of
7243 the test using shifts and logical operations. Otherwise return
7244 NULL. TYPE is the desired result type. */
7247 fold_single_bit_test (location_t loc
, enum tree_code code
,
7248 tree arg0
, tree arg1
, tree result_type
)
7250 /* If this is testing a single bit, we can optimize the test. */
7251 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
7252 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
7253 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
7255 tree inner
= TREE_OPERAND (arg0
, 0);
7256 tree type
= TREE_TYPE (arg0
);
7257 int bitnum
= tree_log2 (TREE_OPERAND (arg0
, 1));
7258 scalar_int_mode operand_mode
= SCALAR_INT_TYPE_MODE (type
);
7260 tree signed_type
, unsigned_type
, intermediate_type
;
7263 /* First, see if we can fold the single bit test into a sign-bit
7265 tem
= fold_single_bit_test_into_sign_test (loc
, code
, arg0
, arg1
,
7270 /* Otherwise we have (A & C) != 0 where C is a single bit,
7271 convert that into ((A >> C2) & 1). Where C2 = log2(C).
7272 Similarly for (A & C) == 0. */
7274 /* If INNER is a right shift of a constant and it plus BITNUM does
7275 not overflow, adjust BITNUM and INNER. */
7276 if (TREE_CODE (inner
) == RSHIFT_EXPR
7277 && TREE_CODE (TREE_OPERAND (inner
, 1)) == INTEGER_CST
7278 && bitnum
< TYPE_PRECISION (type
)
7279 && wi::ltu_p (wi::to_wide (TREE_OPERAND (inner
, 1)),
7280 TYPE_PRECISION (type
) - bitnum
))
7282 bitnum
+= tree_to_uhwi (TREE_OPERAND (inner
, 1));
7283 inner
= TREE_OPERAND (inner
, 0);
7286 /* If we are going to be able to omit the AND below, we must do our
7287 operations as unsigned. If we must use the AND, we have a choice.
7288 Normally unsigned is faster, but for some machines signed is. */
7289 ops_unsigned
= (load_extend_op (operand_mode
) == SIGN_EXTEND
7290 && !flag_syntax_only
) ? 0 : 1;
7292 signed_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 0);
7293 unsigned_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 1);
7294 intermediate_type
= ops_unsigned
? unsigned_type
: signed_type
;
7295 inner
= fold_convert_loc (loc
, intermediate_type
, inner
);
7298 inner
= build2 (RSHIFT_EXPR
, intermediate_type
,
7299 inner
, size_int (bitnum
));
7301 one
= build_int_cst (intermediate_type
, 1);
7303 if (code
== EQ_EXPR
)
7304 inner
= fold_build2_loc (loc
, BIT_XOR_EXPR
, intermediate_type
, inner
, one
);
7306 /* Put the AND last so it can combine with more things. */
7307 inner
= build2 (BIT_AND_EXPR
, intermediate_type
, inner
, one
);
7309 /* Make sure to return the proper type. */
7310 inner
= fold_convert_loc (loc
, result_type
, inner
);
7317 /* Test whether it is preferable two swap two operands, ARG0 and
7318 ARG1, for example because ARG0 is an integer constant and ARG1
7322 tree_swap_operands_p (const_tree arg0
, const_tree arg1
)
7324 if (CONSTANT_CLASS_P (arg1
))
7326 if (CONSTANT_CLASS_P (arg0
))
7332 if (TREE_CONSTANT (arg1
))
7334 if (TREE_CONSTANT (arg0
))
7337 /* It is preferable to swap two SSA_NAME to ensure a canonical form
7338 for commutative and comparison operators. Ensuring a canonical
7339 form allows the optimizers to find additional redundancies without
7340 having to explicitly check for both orderings. */
7341 if (TREE_CODE (arg0
) == SSA_NAME
7342 && TREE_CODE (arg1
) == SSA_NAME
7343 && SSA_NAME_VERSION (arg0
) > SSA_NAME_VERSION (arg1
))
7346 /* Put SSA_NAMEs last. */
7347 if (TREE_CODE (arg1
) == SSA_NAME
)
7349 if (TREE_CODE (arg0
) == SSA_NAME
)
7352 /* Put variables last. */
7362 /* Fold A < X && A + 1 > Y to A < X && A >= Y. Normally A + 1 > Y
7363 means A >= Y && A != MAX, but in this case we know that
7364 A < X <= MAX. INEQ is A + 1 > Y, BOUND is A < X. */
7367 fold_to_nonsharp_ineq_using_bound (location_t loc
, tree ineq
, tree bound
)
7369 tree a
, typea
, type
= TREE_TYPE (ineq
), a1
, diff
, y
;
7371 if (TREE_CODE (bound
) == LT_EXPR
)
7372 a
= TREE_OPERAND (bound
, 0);
7373 else if (TREE_CODE (bound
) == GT_EXPR
)
7374 a
= TREE_OPERAND (bound
, 1);
7378 typea
= TREE_TYPE (a
);
7379 if (!INTEGRAL_TYPE_P (typea
)
7380 && !POINTER_TYPE_P (typea
))
7383 if (TREE_CODE (ineq
) == LT_EXPR
)
7385 a1
= TREE_OPERAND (ineq
, 1);
7386 y
= TREE_OPERAND (ineq
, 0);
7388 else if (TREE_CODE (ineq
) == GT_EXPR
)
7390 a1
= TREE_OPERAND (ineq
, 0);
7391 y
= TREE_OPERAND (ineq
, 1);
7396 if (TREE_TYPE (a1
) != typea
)
7399 if (POINTER_TYPE_P (typea
))
7401 /* Convert the pointer types into integer before taking the difference. */
7402 tree ta
= fold_convert_loc (loc
, ssizetype
, a
);
7403 tree ta1
= fold_convert_loc (loc
, ssizetype
, a1
);
7404 diff
= fold_binary_loc (loc
, MINUS_EXPR
, ssizetype
, ta1
, ta
);
7407 diff
= fold_binary_loc (loc
, MINUS_EXPR
, typea
, a1
, a
);
7409 if (!diff
|| !integer_onep (diff
))
7412 return fold_build2_loc (loc
, GE_EXPR
, type
, a
, y
);
7415 /* Fold a sum or difference of at least one multiplication.
7416 Returns the folded tree or NULL if no simplification could be made. */
7419 fold_plusminus_mult_expr (location_t loc
, enum tree_code code
, tree type
,
7420 tree arg0
, tree arg1
)
7422 tree arg00
, arg01
, arg10
, arg11
;
7423 tree alt0
= NULL_TREE
, alt1
= NULL_TREE
, same
;
7425 /* (A * C) +- (B * C) -> (A+-B) * C.
7426 (A * C) +- A -> A * (C+-1).
7427 We are most concerned about the case where C is a constant,
7428 but other combinations show up during loop reduction. Since
7429 it is not difficult, try all four possibilities. */
7431 if (TREE_CODE (arg0
) == MULT_EXPR
)
7433 arg00
= TREE_OPERAND (arg0
, 0);
7434 arg01
= TREE_OPERAND (arg0
, 1);
7436 else if (TREE_CODE (arg0
) == INTEGER_CST
)
7438 arg00
= build_one_cst (type
);
7443 /* We cannot generate constant 1 for fract. */
7444 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
7447 arg01
= build_one_cst (type
);
7449 if (TREE_CODE (arg1
) == MULT_EXPR
)
7451 arg10
= TREE_OPERAND (arg1
, 0);
7452 arg11
= TREE_OPERAND (arg1
, 1);
7454 else if (TREE_CODE (arg1
) == INTEGER_CST
)
7456 arg10
= build_one_cst (type
);
7457 /* As we canonicalize A - 2 to A + -2 get rid of that sign for
7458 the purpose of this canonicalization. */
7459 if (wi::neg_p (wi::to_wide (arg1
), TYPE_SIGN (TREE_TYPE (arg1
)))
7460 && negate_expr_p (arg1
)
7461 && code
== PLUS_EXPR
)
7463 arg11
= negate_expr (arg1
);
7471 /* We cannot generate constant 1 for fract. */
7472 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
7475 arg11
= build_one_cst (type
);
7479 /* Prefer factoring a common non-constant. */
7480 if (operand_equal_p (arg00
, arg10
, 0))
7481 same
= arg00
, alt0
= arg01
, alt1
= arg11
;
7482 else if (operand_equal_p (arg01
, arg11
, 0))
7483 same
= arg01
, alt0
= arg00
, alt1
= arg10
;
7484 else if (operand_equal_p (arg00
, arg11
, 0))
7485 same
= arg00
, alt0
= arg01
, alt1
= arg10
;
7486 else if (operand_equal_p (arg01
, arg10
, 0))
7487 same
= arg01
, alt0
= arg00
, alt1
= arg11
;
7489 /* No identical multiplicands; see if we can find a common
7490 power-of-two factor in non-power-of-two multiplies. This
7491 can help in multi-dimensional array access. */
7492 else if (tree_fits_shwi_p (arg01
) && tree_fits_shwi_p (arg11
))
7494 HOST_WIDE_INT int01
= tree_to_shwi (arg01
);
7495 HOST_WIDE_INT int11
= tree_to_shwi (arg11
);
7500 /* Move min of absolute values to int11. */
7501 if (absu_hwi (int01
) < absu_hwi (int11
))
7503 tmp
= int01
, int01
= int11
, int11
= tmp
;
7504 alt0
= arg00
, arg00
= arg10
, arg10
= alt0
;
7511 const unsigned HOST_WIDE_INT factor
= absu_hwi (int11
);
7513 && pow2p_hwi (factor
)
7514 && (int01
& (factor
- 1)) == 0
7515 /* The remainder should not be a constant, otherwise we
7516 end up folding i * 4 + 2 to (i * 2 + 1) * 2 which has
7517 increased the number of multiplications necessary. */
7518 && TREE_CODE (arg10
) != INTEGER_CST
)
7520 alt0
= fold_build2_loc (loc
, MULT_EXPR
, TREE_TYPE (arg00
), arg00
,
7521 build_int_cst (TREE_TYPE (arg00
),
7526 maybe_same
= alt0
, alt0
= alt1
, alt1
= maybe_same
;
7533 if (! ANY_INTEGRAL_TYPE_P (type
)
7534 || TYPE_OVERFLOW_WRAPS (type
)
7535 /* We are neither factoring zero nor minus one. */
7536 || TREE_CODE (same
) == INTEGER_CST
)
7537 return fold_build2_loc (loc
, MULT_EXPR
, type
,
7538 fold_build2_loc (loc
, code
, type
,
7539 fold_convert_loc (loc
, type
, alt0
),
7540 fold_convert_loc (loc
, type
, alt1
)),
7541 fold_convert_loc (loc
, type
, same
));
7543 /* Same may be zero and thus the operation 'code' may overflow. Likewise
7544 same may be minus one and thus the multiplication may overflow. Perform
7545 the sum operation in an unsigned type. */
7546 tree utype
= unsigned_type_for (type
);
7547 tree tem
= fold_build2_loc (loc
, code
, utype
,
7548 fold_convert_loc (loc
, utype
, alt0
),
7549 fold_convert_loc (loc
, utype
, alt1
));
7550 /* If the sum evaluated to a constant that is not -INF the multiplication
7552 if (TREE_CODE (tem
) == INTEGER_CST
7553 && (wi::to_wide (tem
)
7554 != wi::min_value (TYPE_PRECISION (utype
), SIGNED
)))
7555 return fold_build2_loc (loc
, MULT_EXPR
, type
,
7556 fold_convert (type
, tem
), same
);
7558 /* Do not resort to unsigned multiplication because
7559 we lose the no-overflow property of the expression. */
7563 /* Subroutine of native_encode_expr. Encode the INTEGER_CST
7564 specified by EXPR into the buffer PTR of length LEN bytes.
7565 Return the number of bytes placed in the buffer, or zero
7569 native_encode_int (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7571 tree type
= TREE_TYPE (expr
);
7572 int total_bytes
= GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type
));
7573 int byte
, offset
, word
, words
;
7574 unsigned char value
;
7576 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7583 return MIN (len
, total_bytes
- off
);
7585 words
= total_bytes
/ UNITS_PER_WORD
;
7587 for (byte
= 0; byte
< total_bytes
; byte
++)
7589 int bitpos
= byte
* BITS_PER_UNIT
;
7590 /* Extend EXPR according to TYPE_SIGN if the precision isn't a whole
7592 value
= wi::extract_uhwi (wi::to_widest (expr
), bitpos
, BITS_PER_UNIT
);
7594 if (total_bytes
> UNITS_PER_WORD
)
7596 word
= byte
/ UNITS_PER_WORD
;
7597 if (WORDS_BIG_ENDIAN
)
7598 word
= (words
- 1) - word
;
7599 offset
= word
* UNITS_PER_WORD
;
7600 if (BYTES_BIG_ENDIAN
)
7601 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7603 offset
+= byte
% UNITS_PER_WORD
;
7606 offset
= BYTES_BIG_ENDIAN
? (total_bytes
- 1) - byte
: byte
;
7607 if (offset
>= off
&& offset
- off
< len
)
7608 ptr
[offset
- off
] = value
;
7610 return MIN (len
, total_bytes
- off
);
7614 /* Subroutine of native_encode_expr. Encode the FIXED_CST
7615 specified by EXPR into the buffer PTR of length LEN bytes.
7616 Return the number of bytes placed in the buffer, or zero
7620 native_encode_fixed (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7622 tree type
= TREE_TYPE (expr
);
7623 scalar_mode mode
= SCALAR_TYPE_MODE (type
);
7624 int total_bytes
= GET_MODE_SIZE (mode
);
7625 FIXED_VALUE_TYPE value
;
7626 tree i_value
, i_type
;
7628 if (total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7631 i_type
= lang_hooks
.types
.type_for_size (GET_MODE_BITSIZE (mode
), 1);
7633 if (NULL_TREE
== i_type
|| TYPE_PRECISION (i_type
) != total_bytes
)
7636 value
= TREE_FIXED_CST (expr
);
7637 i_value
= double_int_to_tree (i_type
, value
.data
);
7639 return native_encode_int (i_value
, ptr
, len
, off
);
7643 /* Subroutine of native_encode_expr. Encode the REAL_CST
7644 specified by EXPR into the buffer PTR of length LEN bytes.
7645 Return the number of bytes placed in the buffer, or zero
7649 native_encode_real (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7651 tree type
= TREE_TYPE (expr
);
7652 int total_bytes
= GET_MODE_SIZE (SCALAR_FLOAT_TYPE_MODE (type
));
7653 int byte
, offset
, word
, words
, bitpos
;
7654 unsigned char value
;
7656 /* There are always 32 bits in each long, no matter the size of
7657 the hosts long. We handle floating point representations with
7661 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7668 return MIN (len
, total_bytes
- off
);
7670 words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
7672 real_to_target (tmp
, TREE_REAL_CST_PTR (expr
), TYPE_MODE (type
));
7674 for (bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
7675 bitpos
+= BITS_PER_UNIT
)
7677 byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
7678 value
= (unsigned char) (tmp
[bitpos
/ 32] >> (bitpos
& 31));
7680 if (UNITS_PER_WORD
< 4)
7682 word
= byte
/ UNITS_PER_WORD
;
7683 if (WORDS_BIG_ENDIAN
)
7684 word
= (words
- 1) - word
;
7685 offset
= word
* UNITS_PER_WORD
;
7686 if (BYTES_BIG_ENDIAN
)
7687 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7689 offset
+= byte
% UNITS_PER_WORD
;
7694 if (BYTES_BIG_ENDIAN
)
7696 /* Reverse bytes within each long, or within the entire float
7697 if it's smaller than a long (for HFmode). */
7698 offset
= MIN (3, total_bytes
- 1) - offset
;
7699 gcc_assert (offset
>= 0);
7702 offset
= offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3);
7704 && offset
- off
< len
)
7705 ptr
[offset
- off
] = value
;
7707 return MIN (len
, total_bytes
- off
);
7710 /* Subroutine of native_encode_expr. Encode the COMPLEX_CST
7711 specified by EXPR into the buffer PTR of length LEN bytes.
7712 Return the number of bytes placed in the buffer, or zero
7716 native_encode_complex (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7721 part
= TREE_REALPART (expr
);
7722 rsize
= native_encode_expr (part
, ptr
, len
, off
);
7723 if (off
== -1 && rsize
== 0)
7725 part
= TREE_IMAGPART (expr
);
7727 off
= MAX (0, off
- GET_MODE_SIZE (SCALAR_TYPE_MODE (TREE_TYPE (part
))));
7728 isize
= native_encode_expr (part
, ptr
? ptr
+ rsize
: NULL
,
7730 if (off
== -1 && isize
!= rsize
)
7732 return rsize
+ isize
;
7735 /* Like native_encode_vector, but only encode the first COUNT elements.
7736 The other arguments are as for native_encode_vector. */
7739 native_encode_vector_part (const_tree expr
, unsigned char *ptr
, int len
,
7740 int off
, unsigned HOST_WIDE_INT count
)
7742 tree itype
= TREE_TYPE (TREE_TYPE (expr
));
7743 if (VECTOR_BOOLEAN_TYPE_P (TREE_TYPE (expr
))
7744 && TYPE_PRECISION (itype
) <= BITS_PER_UNIT
)
7746 /* This is the only case in which elements can be smaller than a byte.
7747 Element 0 is always in the lsb of the containing byte. */
7748 unsigned int elt_bits
= TYPE_PRECISION (itype
);
7749 int total_bytes
= CEIL (elt_bits
* count
, BITS_PER_UNIT
);
7750 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7756 /* Zero the buffer and then set bits later where necessary. */
7757 int extract_bytes
= MIN (len
, total_bytes
- off
);
7759 memset (ptr
, 0, extract_bytes
);
7761 unsigned int elts_per_byte
= BITS_PER_UNIT
/ elt_bits
;
7762 unsigned int first_elt
= off
* elts_per_byte
;
7763 unsigned int extract_elts
= extract_bytes
* elts_per_byte
;
7764 for (unsigned int i
= 0; i
< extract_elts
; ++i
)
7766 tree elt
= VECTOR_CST_ELT (expr
, first_elt
+ i
);
7767 if (TREE_CODE (elt
) != INTEGER_CST
)
7770 if (ptr
&& wi::extract_uhwi (wi::to_wide (elt
), 0, 1))
7772 unsigned int bit
= i
* elt_bits
;
7773 ptr
[bit
/ BITS_PER_UNIT
] |= 1 << (bit
% BITS_PER_UNIT
);
7776 return extract_bytes
;
7780 int size
= GET_MODE_SIZE (SCALAR_TYPE_MODE (itype
));
7781 for (unsigned HOST_WIDE_INT i
= 0; i
< count
; i
++)
7788 tree elem
= VECTOR_CST_ELT (expr
, i
);
7789 int res
= native_encode_expr (elem
, ptr
? ptr
+ offset
: NULL
,
7791 if ((off
== -1 && res
!= size
) || res
== 0)
7795 return (off
== -1 && i
< count
- 1) ? 0 : offset
;
7802 /* Subroutine of native_encode_expr. Encode the VECTOR_CST
7803 specified by EXPR into the buffer PTR of length LEN bytes.
7804 Return the number of bytes placed in the buffer, or zero
7808 native_encode_vector (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7810 unsigned HOST_WIDE_INT count
;
7811 if (!VECTOR_CST_NELTS (expr
).is_constant (&count
))
7813 return native_encode_vector_part (expr
, ptr
, len
, off
, count
);
7817 /* Subroutine of native_encode_expr. Encode the STRING_CST
7818 specified by EXPR into the buffer PTR of length LEN bytes.
7819 Return the number of bytes placed in the buffer, or zero
7823 native_encode_string (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7825 tree type
= TREE_TYPE (expr
);
7827 /* Wide-char strings are encoded in target byte-order so native
7828 encoding them is trivial. */
7829 if (BITS_PER_UNIT
!= CHAR_BIT
7830 || TREE_CODE (type
) != ARRAY_TYPE
7831 || TREE_CODE (TREE_TYPE (type
)) != INTEGER_TYPE
7832 || !tree_fits_shwi_p (TYPE_SIZE_UNIT (type
)))
7835 HOST_WIDE_INT total_bytes
= tree_to_shwi (TYPE_SIZE_UNIT (TREE_TYPE (expr
)));
7836 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7840 len
= MIN (total_bytes
- off
, len
);
7846 if (off
< TREE_STRING_LENGTH (expr
))
7848 written
= MIN (len
, TREE_STRING_LENGTH (expr
) - off
);
7849 memcpy (ptr
, TREE_STRING_POINTER (expr
) + off
, written
);
7851 memset (ptr
+ written
, 0, len
- written
);
7857 /* Subroutine of fold_view_convert_expr. Encode the INTEGER_CST,
7858 REAL_CST, COMPLEX_CST or VECTOR_CST specified by EXPR into the
7859 buffer PTR of length LEN bytes. If PTR is NULL, don't actually store
7860 anything, just do a dry run. If OFF is not -1 then start
7861 the encoding at byte offset OFF and encode at most LEN bytes.
7862 Return the number of bytes placed in the buffer, or zero upon failure. */
7865 native_encode_expr (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7867 /* We don't support starting at negative offset and -1 is special. */
7871 switch (TREE_CODE (expr
))
7874 return native_encode_int (expr
, ptr
, len
, off
);
7877 return native_encode_real (expr
, ptr
, len
, off
);
7880 return native_encode_fixed (expr
, ptr
, len
, off
);
7883 return native_encode_complex (expr
, ptr
, len
, off
);
7886 return native_encode_vector (expr
, ptr
, len
, off
);
7889 return native_encode_string (expr
, ptr
, len
, off
);
7896 /* Similar to native_encode_expr, but also handle CONSTRUCTORs, VCEs,
7897 NON_LVALUE_EXPRs and nops. */
7900 native_encode_initializer (tree init
, unsigned char *ptr
, int len
,
7903 /* We don't support starting at negative offset and -1 is special. */
7904 if (off
< -1 || init
== NULL_TREE
)
7908 switch (TREE_CODE (init
))
7910 case VIEW_CONVERT_EXPR
:
7911 case NON_LVALUE_EXPR
:
7912 return native_encode_initializer (TREE_OPERAND (init
, 0), ptr
, len
, off
);
7914 return native_encode_expr (init
, ptr
, len
, off
);
7916 tree type
= TREE_TYPE (init
);
7917 HOST_WIDE_INT total_bytes
= int_size_in_bytes (type
);
7918 if (total_bytes
< 0)
7920 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7922 int o
= off
== -1 ? 0 : off
;
7923 if (TREE_CODE (type
) == ARRAY_TYPE
)
7925 HOST_WIDE_INT min_index
;
7926 unsigned HOST_WIDE_INT cnt
;
7927 HOST_WIDE_INT curpos
= 0, fieldsize
;
7928 constructor_elt
*ce
;
7930 if (TYPE_DOMAIN (type
) == NULL_TREE
7931 || !tree_fits_shwi_p (TYPE_MIN_VALUE (TYPE_DOMAIN (type
))))
7934 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
7938 min_index
= tree_to_shwi (TYPE_MIN_VALUE (TYPE_DOMAIN (type
)));
7940 memset (ptr
, '\0', MIN (total_bytes
- off
, len
));
7942 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (init
), cnt
, ce
)
7944 tree val
= ce
->value
;
7945 tree index
= ce
->index
;
7946 HOST_WIDE_INT pos
= curpos
, count
= 0;
7948 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
7950 if (!tree_fits_shwi_p (TREE_OPERAND (index
, 0))
7951 || !tree_fits_shwi_p (TREE_OPERAND (index
, 1)))
7953 pos
= (tree_to_shwi (TREE_OPERAND (index
, 0)) - min_index
)
7955 count
= (tree_to_shwi (TREE_OPERAND (index
, 1))
7956 - tree_to_shwi (TREE_OPERAND (index
, 0)));
7960 if (!tree_fits_shwi_p (index
))
7962 pos
= (tree_to_shwi (index
) - min_index
) * fieldsize
;
7971 && (curpos
+ fieldsize
7972 <= (HOST_WIDE_INT
) off
+ len
)))
7977 memcpy (ptr
+ (curpos
- o
), ptr
+ (pos
- o
),
7980 else if (!native_encode_initializer (val
,
7994 else if (curpos
+ fieldsize
> off
7995 && curpos
< (HOST_WIDE_INT
) off
+ len
)
7997 /* Partial overlap. */
7998 unsigned char *p
= NULL
;
8004 p
= ptr
+ curpos
- off
;
8005 l
= MIN ((HOST_WIDE_INT
) off
+ len
- curpos
,
8014 if (!native_encode_initializer (val
, p
, l
, no
))
8017 curpos
+= fieldsize
;
8019 while (count
-- != 0);
8021 return MIN (total_bytes
- off
, len
);
8023 else if (TREE_CODE (type
) == RECORD_TYPE
8024 || TREE_CODE (type
) == UNION_TYPE
)
8026 unsigned HOST_WIDE_INT cnt
;
8027 constructor_elt
*ce
;
8030 memset (ptr
, '\0', MIN (total_bytes
- off
, len
));
8031 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (init
), cnt
, ce
)
8033 tree field
= ce
->index
;
8034 tree val
= ce
->value
;
8035 HOST_WIDE_INT pos
, fieldsize
;
8037 if (field
== NULL_TREE
)
8040 pos
= int_byte_position (field
);
8041 if (off
!= -1 && (HOST_WIDE_INT
) off
+ len
<= pos
)
8044 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
8045 && TYPE_DOMAIN (TREE_TYPE (field
))
8046 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
8048 if (DECL_SIZE_UNIT (field
) == NULL_TREE
8049 || !tree_fits_shwi_p (DECL_SIZE_UNIT (field
)))
8051 fieldsize
= tree_to_shwi (DECL_SIZE_UNIT (field
));
8055 if (off
!= -1 && pos
+ fieldsize
<= off
)
8058 if (DECL_BIT_FIELD (field
))
8061 if (val
== NULL_TREE
)
8066 && (pos
+ fieldsize
<= (HOST_WIDE_INT
) off
+ len
)))
8068 if (!native_encode_initializer (val
, ptr
? ptr
+ pos
- o
8071 off
== -1 ? -1 : 0))
8076 /* Partial overlap. */
8077 unsigned char *p
= NULL
;
8083 p
= ptr
+ pos
- off
;
8084 l
= MIN ((HOST_WIDE_INT
) off
+ len
- pos
,
8093 if (!native_encode_initializer (val
, p
, l
, no
))
8097 return MIN (total_bytes
- off
, len
);
8104 /* Subroutine of native_interpret_expr. Interpret the contents of
8105 the buffer PTR of length LEN as an INTEGER_CST of type TYPE.
8106 If the buffer cannot be interpreted, return NULL_TREE. */
8109 native_interpret_int (tree type
, const unsigned char *ptr
, int len
)
8111 int total_bytes
= GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type
));
8113 if (total_bytes
> len
8114 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
8117 wide_int result
= wi::from_buffer (ptr
, total_bytes
);
8119 return wide_int_to_tree (type
, result
);
8123 /* Subroutine of native_interpret_expr. Interpret the contents of
8124 the buffer PTR of length LEN as a FIXED_CST of type TYPE.
8125 If the buffer cannot be interpreted, return NULL_TREE. */
8128 native_interpret_fixed (tree type
, const unsigned char *ptr
, int len
)
8130 scalar_mode mode
= SCALAR_TYPE_MODE (type
);
8131 int total_bytes
= GET_MODE_SIZE (mode
);
8133 FIXED_VALUE_TYPE fixed_value
;
8135 if (total_bytes
> len
8136 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
8139 result
= double_int::from_buffer (ptr
, total_bytes
);
8140 fixed_value
= fixed_from_double_int (result
, mode
);
8142 return build_fixed (type
, fixed_value
);
8146 /* Subroutine of native_interpret_expr. Interpret the contents of
8147 the buffer PTR of length LEN as a REAL_CST of type TYPE.
8148 If the buffer cannot be interpreted, return NULL_TREE. */
8151 native_interpret_real (tree type
, const unsigned char *ptr
, int len
)
8153 scalar_float_mode mode
= SCALAR_FLOAT_TYPE_MODE (type
);
8154 int total_bytes
= GET_MODE_SIZE (mode
);
8155 unsigned char value
;
8156 /* There are always 32 bits in each long, no matter the size of
8157 the hosts long. We handle floating point representations with
8162 if (total_bytes
> len
|| total_bytes
> 24)
8164 int words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
8166 memset (tmp
, 0, sizeof (tmp
));
8167 for (int bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
8168 bitpos
+= BITS_PER_UNIT
)
8170 /* Both OFFSET and BYTE index within a long;
8171 bitpos indexes the whole float. */
8172 int offset
, byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
8173 if (UNITS_PER_WORD
< 4)
8175 int word
= byte
/ UNITS_PER_WORD
;
8176 if (WORDS_BIG_ENDIAN
)
8177 word
= (words
- 1) - word
;
8178 offset
= word
* UNITS_PER_WORD
;
8179 if (BYTES_BIG_ENDIAN
)
8180 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
8182 offset
+= byte
% UNITS_PER_WORD
;
8187 if (BYTES_BIG_ENDIAN
)
8189 /* Reverse bytes within each long, or within the entire float
8190 if it's smaller than a long (for HFmode). */
8191 offset
= MIN (3, total_bytes
- 1) - offset
;
8192 gcc_assert (offset
>= 0);
8195 value
= ptr
[offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3)];
8197 tmp
[bitpos
/ 32] |= (unsigned long)value
<< (bitpos
& 31);
8200 real_from_target (&r
, tmp
, mode
);
8201 return build_real (type
, r
);
8205 /* Subroutine of native_interpret_expr. Interpret the contents of
8206 the buffer PTR of length LEN as a COMPLEX_CST of type TYPE.
8207 If the buffer cannot be interpreted, return NULL_TREE. */
8210 native_interpret_complex (tree type
, const unsigned char *ptr
, int len
)
8212 tree etype
, rpart
, ipart
;
8215 etype
= TREE_TYPE (type
);
8216 size
= GET_MODE_SIZE (SCALAR_TYPE_MODE (etype
));
8219 rpart
= native_interpret_expr (etype
, ptr
, size
);
8222 ipart
= native_interpret_expr (etype
, ptr
+size
, size
);
8225 return build_complex (type
, rpart
, ipart
);
8228 /* Read a vector of type TYPE from the target memory image given by BYTES,
8229 which contains LEN bytes. The vector is known to be encodable using
8230 NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each.
8232 Return the vector on success, otherwise return null. */
8235 native_interpret_vector_part (tree type
, const unsigned char *bytes
,
8236 unsigned int len
, unsigned int npatterns
,
8237 unsigned int nelts_per_pattern
)
8239 tree elt_type
= TREE_TYPE (type
);
8240 if (VECTOR_BOOLEAN_TYPE_P (type
)
8241 && TYPE_PRECISION (elt_type
) <= BITS_PER_UNIT
)
8243 /* This is the only case in which elements can be smaller than a byte.
8244 Element 0 is always in the lsb of the containing byte. */
8245 unsigned int elt_bits
= TYPE_PRECISION (elt_type
);
8246 if (elt_bits
* npatterns
* nelts_per_pattern
> len
* BITS_PER_UNIT
)
8249 tree_vector_builder
builder (type
, npatterns
, nelts_per_pattern
);
8250 for (unsigned int i
= 0; i
< builder
.encoded_nelts (); ++i
)
8252 unsigned int bit_index
= i
* elt_bits
;
8253 unsigned int byte_index
= bit_index
/ BITS_PER_UNIT
;
8254 unsigned int lsb
= bit_index
% BITS_PER_UNIT
;
8255 builder
.quick_push (bytes
[byte_index
] & (1 << lsb
)
8256 ? build_all_ones_cst (elt_type
)
8257 : build_zero_cst (elt_type
));
8259 return builder
.build ();
8262 unsigned int elt_bytes
= tree_to_uhwi (TYPE_SIZE_UNIT (elt_type
));
8263 if (elt_bytes
* npatterns
* nelts_per_pattern
> len
)
8266 tree_vector_builder
builder (type
, npatterns
, nelts_per_pattern
);
8267 for (unsigned int i
= 0; i
< builder
.encoded_nelts (); ++i
)
8269 tree elt
= native_interpret_expr (elt_type
, bytes
, elt_bytes
);
8272 builder
.quick_push (elt
);
8275 return builder
.build ();
8278 /* Subroutine of native_interpret_expr. Interpret the contents of
8279 the buffer PTR of length LEN as a VECTOR_CST of type TYPE.
8280 If the buffer cannot be interpreted, return NULL_TREE. */
8283 native_interpret_vector (tree type
, const unsigned char *ptr
, unsigned int len
)
8287 unsigned HOST_WIDE_INT count
;
8289 etype
= TREE_TYPE (type
);
8290 size
= GET_MODE_SIZE (SCALAR_TYPE_MODE (etype
));
8291 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&count
)
8292 || size
* count
> len
)
8295 return native_interpret_vector_part (type
, ptr
, len
, count
, 1);
8299 /* Subroutine of fold_view_convert_expr. Interpret the contents of
8300 the buffer PTR of length LEN as a constant of type TYPE. For
8301 INTEGRAL_TYPE_P we return an INTEGER_CST, for SCALAR_FLOAT_TYPE_P
8302 we return a REAL_CST, etc... If the buffer cannot be interpreted,
8303 return NULL_TREE. */
8306 native_interpret_expr (tree type
, const unsigned char *ptr
, int len
)
8308 switch (TREE_CODE (type
))
8314 case REFERENCE_TYPE
:
8315 return native_interpret_int (type
, ptr
, len
);
8318 return native_interpret_real (type
, ptr
, len
);
8320 case FIXED_POINT_TYPE
:
8321 return native_interpret_fixed (type
, ptr
, len
);
8324 return native_interpret_complex (type
, ptr
, len
);
8327 return native_interpret_vector (type
, ptr
, len
);
8334 /* Returns true if we can interpret the contents of a native encoding
8338 can_native_interpret_type_p (tree type
)
8340 switch (TREE_CODE (type
))
8346 case REFERENCE_TYPE
:
8347 case FIXED_POINT_TYPE
:
8357 /* Routines for manipulation of native_encode_expr encoded data if the encoded
8358 or extracted constant positions and/or sizes aren't byte aligned. */
8360 /* Shift left the bytes in PTR of SZ elements by AMNT bits, carrying over the
8361 bits between adjacent elements. AMNT should be within
8364 00011111|11100000 << 2 = 01111111|10000000
8365 PTR[1] | PTR[0] PTR[1] | PTR[0]. */
8368 shift_bytes_in_array_left (unsigned char *ptr
, unsigned int sz
,
8374 unsigned char carry_over
= 0U;
8375 unsigned char carry_mask
= (~0U) << (unsigned char) (BITS_PER_UNIT
- amnt
);
8376 unsigned char clear_mask
= (~0U) << amnt
;
8378 for (unsigned int i
= 0; i
< sz
; i
++)
8380 unsigned prev_carry_over
= carry_over
;
8381 carry_over
= (ptr
[i
] & carry_mask
) >> (BITS_PER_UNIT
- amnt
);
8386 ptr
[i
] &= clear_mask
;
8387 ptr
[i
] |= prev_carry_over
;
8392 /* Like shift_bytes_in_array_left but for big-endian.
8393 Shift right the bytes in PTR of SZ elements by AMNT bits, carrying over the
8394 bits between adjacent elements. AMNT should be within
8397 00011111|11100000 >> 2 = 00000111|11111000
8398 PTR[0] | PTR[1] PTR[0] | PTR[1]. */
8401 shift_bytes_in_array_right (unsigned char *ptr
, unsigned int sz
,
8407 unsigned char carry_over
= 0U;
8408 unsigned char carry_mask
= ~(~0U << amnt
);
8410 for (unsigned int i
= 0; i
< sz
; i
++)
8412 unsigned prev_carry_over
= carry_over
;
8413 carry_over
= ptr
[i
] & carry_mask
;
8415 carry_over
<<= (unsigned char) BITS_PER_UNIT
- amnt
;
8417 ptr
[i
] |= prev_carry_over
;
8421 /* Try to view-convert VECTOR_CST EXPR to VECTOR_TYPE TYPE by operating
8422 directly on the VECTOR_CST encoding, in a way that works for variable-
8423 length vectors. Return the resulting VECTOR_CST on success or null
8427 fold_view_convert_vector_encoding (tree type
, tree expr
)
8429 tree expr_type
= TREE_TYPE (expr
);
8430 poly_uint64 type_bits
, expr_bits
;
8431 if (!poly_int_tree_p (TYPE_SIZE (type
), &type_bits
)
8432 || !poly_int_tree_p (TYPE_SIZE (expr_type
), &expr_bits
))
8435 poly_uint64 type_units
= TYPE_VECTOR_SUBPARTS (type
);
8436 poly_uint64 expr_units
= TYPE_VECTOR_SUBPARTS (expr_type
);
8437 unsigned int type_elt_bits
= vector_element_size (type_bits
, type_units
);
8438 unsigned int expr_elt_bits
= vector_element_size (expr_bits
, expr_units
);
8440 /* We can only preserve the semantics of a stepped pattern if the new
8441 vector element is an integer of the same size. */
8442 if (VECTOR_CST_STEPPED_P (expr
)
8443 && (!INTEGRAL_TYPE_P (type
) || type_elt_bits
!= expr_elt_bits
))
8446 /* The number of bits needed to encode one element from every pattern
8447 of the original vector. */
8448 unsigned int expr_sequence_bits
8449 = VECTOR_CST_NPATTERNS (expr
) * expr_elt_bits
;
8451 /* The number of bits needed to encode one element from every pattern
8453 unsigned int type_sequence_bits
8454 = least_common_multiple (expr_sequence_bits
, type_elt_bits
);
8456 /* Don't try to read more bytes than are available, which can happen
8457 for constant-sized vectors if TYPE has larger elements than EXPR_TYPE.
8458 The general VIEW_CONVERT handling can cope with that case, so there's
8459 no point complicating things here. */
8460 unsigned int nelts_per_pattern
= VECTOR_CST_NELTS_PER_PATTERN (expr
);
8461 unsigned int buffer_bytes
= CEIL (nelts_per_pattern
* type_sequence_bits
,
8463 unsigned int buffer_bits
= buffer_bytes
* BITS_PER_UNIT
;
8464 if (known_gt (buffer_bits
, expr_bits
))
8467 /* Get enough bytes of EXPR to form the new encoding. */
8468 auto_vec
<unsigned char, 128> buffer (buffer_bytes
);
8469 buffer
.quick_grow (buffer_bytes
);
8470 if (native_encode_vector_part (expr
, buffer
.address (), buffer_bytes
, 0,
8471 buffer_bits
/ expr_elt_bits
)
8472 != (int) buffer_bytes
)
8475 /* Reencode the bytes as TYPE. */
8476 unsigned int type_npatterns
= type_sequence_bits
/ type_elt_bits
;
8477 return native_interpret_vector_part (type
, &buffer
[0], buffer
.length (),
8478 type_npatterns
, nelts_per_pattern
);
8481 /* Fold a VIEW_CONVERT_EXPR of a constant expression EXPR to type
8482 TYPE at compile-time. If we're unable to perform the conversion
8483 return NULL_TREE. */
8486 fold_view_convert_expr (tree type
, tree expr
)
8488 /* We support up to 512-bit values (for V8DFmode). */
8489 unsigned char buffer
[64];
8492 /* Check that the host and target are sane. */
8493 if (CHAR_BIT
!= 8 || BITS_PER_UNIT
!= 8)
8496 if (VECTOR_TYPE_P (type
) && TREE_CODE (expr
) == VECTOR_CST
)
8497 if (tree res
= fold_view_convert_vector_encoding (type
, expr
))
8500 len
= native_encode_expr (expr
, buffer
, sizeof (buffer
));
8504 return native_interpret_expr (type
, buffer
, len
);
8507 /* Build an expression for the address of T. Folds away INDIRECT_REF
8508 to avoid confusing the gimplify process. */
8511 build_fold_addr_expr_with_type_loc (location_t loc
, tree t
, tree ptrtype
)
8513 /* The size of the object is not relevant when talking about its address. */
8514 if (TREE_CODE (t
) == WITH_SIZE_EXPR
)
8515 t
= TREE_OPERAND (t
, 0);
8517 if (TREE_CODE (t
) == INDIRECT_REF
)
8519 t
= TREE_OPERAND (t
, 0);
8521 if (TREE_TYPE (t
) != ptrtype
)
8522 t
= build1_loc (loc
, NOP_EXPR
, ptrtype
, t
);
8524 else if (TREE_CODE (t
) == MEM_REF
8525 && integer_zerop (TREE_OPERAND (t
, 1)))
8526 return TREE_OPERAND (t
, 0);
8527 else if (TREE_CODE (t
) == MEM_REF
8528 && TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
)
8529 return fold_binary (POINTER_PLUS_EXPR
, ptrtype
,
8530 TREE_OPERAND (t
, 0),
8531 convert_to_ptrofftype (TREE_OPERAND (t
, 1)));
8532 else if (TREE_CODE (t
) == VIEW_CONVERT_EXPR
)
8534 t
= build_fold_addr_expr_loc (loc
, TREE_OPERAND (t
, 0));
8536 if (TREE_TYPE (t
) != ptrtype
)
8537 t
= fold_convert_loc (loc
, ptrtype
, t
);
8540 t
= build1_loc (loc
, ADDR_EXPR
, ptrtype
, t
);
8545 /* Build an expression for the address of T. */
8548 build_fold_addr_expr_loc (location_t loc
, tree t
)
8550 tree ptrtype
= build_pointer_type (TREE_TYPE (t
));
8552 return build_fold_addr_expr_with_type_loc (loc
, t
, ptrtype
);
8555 /* Fold a unary expression of code CODE and type TYPE with operand
8556 OP0. Return the folded expression if folding is successful.
8557 Otherwise, return NULL_TREE. */
8560 fold_unary_loc (location_t loc
, enum tree_code code
, tree type
, tree op0
)
8564 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
8566 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
8567 && TREE_CODE_LENGTH (code
) == 1);
8572 if (CONVERT_EXPR_CODE_P (code
)
8573 || code
== FLOAT_EXPR
|| code
== ABS_EXPR
|| code
== NEGATE_EXPR
)
8575 /* Don't use STRIP_NOPS, because signedness of argument type
8577 STRIP_SIGN_NOPS (arg0
);
8581 /* Strip any conversions that don't change the mode. This
8582 is safe for every expression, except for a comparison
8583 expression because its signedness is derived from its
8586 Note that this is done as an internal manipulation within
8587 the constant folder, in order to find the simplest
8588 representation of the arguments so that their form can be
8589 studied. In any cases, the appropriate type conversions
8590 should be put back in the tree that will get out of the
8595 if (CONSTANT_CLASS_P (arg0
))
8597 tree tem
= const_unop (code
, type
, arg0
);
8600 if (TREE_TYPE (tem
) != type
)
8601 tem
= fold_convert_loc (loc
, type
, tem
);
8607 tem
= generic_simplify (loc
, code
, type
, op0
);
8611 if (TREE_CODE_CLASS (code
) == tcc_unary
)
8613 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
8614 return build2 (COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
8615 fold_build1_loc (loc
, code
, type
,
8616 fold_convert_loc (loc
, TREE_TYPE (op0
),
8617 TREE_OPERAND (arg0
, 1))));
8618 else if (TREE_CODE (arg0
) == COND_EXPR
)
8620 tree arg01
= TREE_OPERAND (arg0
, 1);
8621 tree arg02
= TREE_OPERAND (arg0
, 2);
8622 if (! VOID_TYPE_P (TREE_TYPE (arg01
)))
8623 arg01
= fold_build1_loc (loc
, code
, type
,
8624 fold_convert_loc (loc
,
8625 TREE_TYPE (op0
), arg01
));
8626 if (! VOID_TYPE_P (TREE_TYPE (arg02
)))
8627 arg02
= fold_build1_loc (loc
, code
, type
,
8628 fold_convert_loc (loc
,
8629 TREE_TYPE (op0
), arg02
));
8630 tem
= fold_build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
8633 /* If this was a conversion, and all we did was to move into
8634 inside the COND_EXPR, bring it back out. But leave it if
8635 it is a conversion from integer to integer and the
8636 result precision is no wider than a word since such a
8637 conversion is cheap and may be optimized away by combine,
8638 while it couldn't if it were outside the COND_EXPR. Then return
8639 so we don't get into an infinite recursion loop taking the
8640 conversion out and then back in. */
8642 if ((CONVERT_EXPR_CODE_P (code
)
8643 || code
== NON_LVALUE_EXPR
)
8644 && TREE_CODE (tem
) == COND_EXPR
8645 && TREE_CODE (TREE_OPERAND (tem
, 1)) == code
8646 && TREE_CODE (TREE_OPERAND (tem
, 2)) == code
8647 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 1))
8648 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 2))
8649 && (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))
8650 == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 2), 0)))
8651 && (! (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
8653 (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))))
8654 && TYPE_PRECISION (TREE_TYPE (tem
)) <= BITS_PER_WORD
)
8655 || flag_syntax_only
))
8656 tem
= build1_loc (loc
, code
, type
,
8658 TREE_TYPE (TREE_OPERAND
8659 (TREE_OPERAND (tem
, 1), 0)),
8660 TREE_OPERAND (tem
, 0),
8661 TREE_OPERAND (TREE_OPERAND (tem
, 1), 0),
8662 TREE_OPERAND (TREE_OPERAND (tem
, 2),
8670 case NON_LVALUE_EXPR
:
8671 if (!maybe_lvalue_p (op0
))
8672 return fold_convert_loc (loc
, type
, op0
);
8677 case FIX_TRUNC_EXPR
:
8678 if (COMPARISON_CLASS_P (op0
))
8680 /* If we have (type) (a CMP b) and type is an integral type, return
8681 new expression involving the new type. Canonicalize
8682 (type) (a CMP b) to (a CMP b) ? (type) true : (type) false for
8684 Do not fold the result as that would not simplify further, also
8685 folding again results in recursions. */
8686 if (TREE_CODE (type
) == BOOLEAN_TYPE
)
8687 return build2_loc (loc
, TREE_CODE (op0
), type
,
8688 TREE_OPERAND (op0
, 0),
8689 TREE_OPERAND (op0
, 1));
8690 else if (!INTEGRAL_TYPE_P (type
) && !VOID_TYPE_P (type
)
8691 && TREE_CODE (type
) != VECTOR_TYPE
)
8692 return build3_loc (loc
, COND_EXPR
, type
, op0
,
8693 constant_boolean_node (true, type
),
8694 constant_boolean_node (false, type
));
8697 /* Handle (T *)&A.B.C for A being of type T and B and C
8698 living at offset zero. This occurs frequently in
8699 C++ upcasting and then accessing the base. */
8700 if (TREE_CODE (op0
) == ADDR_EXPR
8701 && POINTER_TYPE_P (type
)
8702 && handled_component_p (TREE_OPERAND (op0
, 0)))
8704 poly_int64 bitsize
, bitpos
;
8707 int unsignedp
, reversep
, volatilep
;
8709 = get_inner_reference (TREE_OPERAND (op0
, 0), &bitsize
, &bitpos
,
8710 &offset
, &mode
, &unsignedp
, &reversep
,
8712 /* If the reference was to a (constant) zero offset, we can use
8713 the address of the base if it has the same base type
8714 as the result type and the pointer type is unqualified. */
8716 && known_eq (bitpos
, 0)
8717 && (TYPE_MAIN_VARIANT (TREE_TYPE (type
))
8718 == TYPE_MAIN_VARIANT (TREE_TYPE (base
)))
8719 && TYPE_QUALS (type
) == TYPE_UNQUALIFIED
)
8720 return fold_convert_loc (loc
, type
,
8721 build_fold_addr_expr_loc (loc
, base
));
8724 if (TREE_CODE (op0
) == MODIFY_EXPR
8725 && TREE_CONSTANT (TREE_OPERAND (op0
, 1))
8726 /* Detect assigning a bitfield. */
8727 && !(TREE_CODE (TREE_OPERAND (op0
, 0)) == COMPONENT_REF
8729 (TREE_OPERAND (TREE_OPERAND (op0
, 0), 1))))
8731 /* Don't leave an assignment inside a conversion
8732 unless assigning a bitfield. */
8733 tem
= fold_build1_loc (loc
, code
, type
, TREE_OPERAND (op0
, 1));
8734 /* First do the assignment, then return converted constant. */
8735 tem
= build2_loc (loc
, COMPOUND_EXPR
, TREE_TYPE (tem
), op0
, tem
);
8736 TREE_NO_WARNING (tem
) = 1;
8737 TREE_USED (tem
) = 1;
8741 /* Convert (T)(x & c) into (T)x & (T)c, if c is an integer
8742 constants (if x has signed type, the sign bit cannot be set
8743 in c). This folds extension into the BIT_AND_EXPR.
8744 ??? We don't do it for BOOLEAN_TYPE or ENUMERAL_TYPE because they
8745 very likely don't have maximal range for their precision and this
8746 transformation effectively doesn't preserve non-maximal ranges. */
8747 if (TREE_CODE (type
) == INTEGER_TYPE
8748 && TREE_CODE (op0
) == BIT_AND_EXPR
8749 && TREE_CODE (TREE_OPERAND (op0
, 1)) == INTEGER_CST
)
8751 tree and_expr
= op0
;
8752 tree and0
= TREE_OPERAND (and_expr
, 0);
8753 tree and1
= TREE_OPERAND (and_expr
, 1);
8756 if (TYPE_UNSIGNED (TREE_TYPE (and_expr
))
8757 || (TYPE_PRECISION (type
)
8758 <= TYPE_PRECISION (TREE_TYPE (and_expr
))))
8760 else if (TYPE_PRECISION (TREE_TYPE (and1
))
8761 <= HOST_BITS_PER_WIDE_INT
8762 && tree_fits_uhwi_p (and1
))
8764 unsigned HOST_WIDE_INT cst
;
8766 cst
= tree_to_uhwi (and1
);
8767 cst
&= HOST_WIDE_INT_M1U
8768 << (TYPE_PRECISION (TREE_TYPE (and1
)) - 1);
8769 change
= (cst
== 0);
8771 && !flag_syntax_only
8772 && (load_extend_op (TYPE_MODE (TREE_TYPE (and0
)))
8775 tree uns
= unsigned_type_for (TREE_TYPE (and0
));
8776 and0
= fold_convert_loc (loc
, uns
, and0
);
8777 and1
= fold_convert_loc (loc
, uns
, and1
);
8782 tem
= force_fit_type (type
, wi::to_widest (and1
), 0,
8783 TREE_OVERFLOW (and1
));
8784 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
8785 fold_convert_loc (loc
, type
, and0
), tem
);
8789 /* Convert (T1)(X p+ Y) into ((T1)X p+ Y), for pointer type, when the new
8790 cast (T1)X will fold away. We assume that this happens when X itself
8792 if (POINTER_TYPE_P (type
)
8793 && TREE_CODE (arg0
) == POINTER_PLUS_EXPR
8794 && CONVERT_EXPR_P (TREE_OPERAND (arg0
, 0)))
8796 tree arg00
= TREE_OPERAND (arg0
, 0);
8797 tree arg01
= TREE_OPERAND (arg0
, 1);
8799 return fold_build_pointer_plus_loc
8800 (loc
, fold_convert_loc (loc
, type
, arg00
), arg01
);
8803 /* Convert (T1)(~(T2)X) into ~(T1)X if T1 and T2 are integral types
8804 of the same precision, and X is an integer type not narrower than
8805 types T1 or T2, i.e. the cast (T2)X isn't an extension. */
8806 if (INTEGRAL_TYPE_P (type
)
8807 && TREE_CODE (op0
) == BIT_NOT_EXPR
8808 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
8809 && CONVERT_EXPR_P (TREE_OPERAND (op0
, 0))
8810 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (op0
)))
8812 tem
= TREE_OPERAND (TREE_OPERAND (op0
, 0), 0);
8813 if (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
8814 && TYPE_PRECISION (type
) <= TYPE_PRECISION (TREE_TYPE (tem
)))
8815 return fold_build1_loc (loc
, BIT_NOT_EXPR
, type
,
8816 fold_convert_loc (loc
, type
, tem
));
8819 /* Convert (T1)(X * Y) into (T1)X * (T1)Y if T1 is narrower than the
8820 type of X and Y (integer types only). */
8821 if (INTEGRAL_TYPE_P (type
)
8822 && TREE_CODE (op0
) == MULT_EXPR
8823 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
8824 && TYPE_PRECISION (type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
8826 /* Be careful not to introduce new overflows. */
8828 if (TYPE_OVERFLOW_WRAPS (type
))
8831 mult_type
= unsigned_type_for (type
);
8833 if (TYPE_PRECISION (mult_type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
8835 tem
= fold_build2_loc (loc
, MULT_EXPR
, mult_type
,
8836 fold_convert_loc (loc
, mult_type
,
8837 TREE_OPERAND (op0
, 0)),
8838 fold_convert_loc (loc
, mult_type
,
8839 TREE_OPERAND (op0
, 1)));
8840 return fold_convert_loc (loc
, type
, tem
);
8846 case VIEW_CONVERT_EXPR
:
8847 if (TREE_CODE (op0
) == MEM_REF
)
8849 if (TYPE_ALIGN (TREE_TYPE (op0
)) != TYPE_ALIGN (type
))
8850 type
= build_aligned_type (type
, TYPE_ALIGN (TREE_TYPE (op0
)));
8851 tem
= fold_build2_loc (loc
, MEM_REF
, type
,
8852 TREE_OPERAND (op0
, 0), TREE_OPERAND (op0
, 1));
8853 REF_REVERSE_STORAGE_ORDER (tem
) = REF_REVERSE_STORAGE_ORDER (op0
);
8860 tem
= fold_negate_expr (loc
, arg0
);
8862 return fold_convert_loc (loc
, type
, tem
);
8866 /* Convert fabs((double)float) into (double)fabsf(float). */
8867 if (TREE_CODE (arg0
) == NOP_EXPR
8868 && TREE_CODE (type
) == REAL_TYPE
)
8870 tree targ0
= strip_float_extensions (arg0
);
8872 return fold_convert_loc (loc
, type
,
8873 fold_build1_loc (loc
, ABS_EXPR
,
8880 /* Convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */
8881 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
8882 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
8883 fold_convert_loc (loc
, type
,
8884 TREE_OPERAND (arg0
, 0)))))
8885 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
, tem
,
8886 fold_convert_loc (loc
, type
,
8887 TREE_OPERAND (arg0
, 1)));
8888 else if (TREE_CODE (arg0
) == BIT_XOR_EXPR
8889 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
8890 fold_convert_loc (loc
, type
,
8891 TREE_OPERAND (arg0
, 1)))))
8892 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
,
8893 fold_convert_loc (loc
, type
,
8894 TREE_OPERAND (arg0
, 0)), tem
);
8898 case TRUTH_NOT_EXPR
:
8899 /* Note that the operand of this must be an int
8900 and its values must be 0 or 1.
8901 ("true" is a fixed value perhaps depending on the language,
8902 but we don't handle values other than 1 correctly yet.) */
8903 tem
= fold_truth_not_expr (loc
, arg0
);
8906 return fold_convert_loc (loc
, type
, tem
);
8909 /* Fold *&X to X if X is an lvalue. */
8910 if (TREE_CODE (op0
) == ADDR_EXPR
)
8912 tree op00
= TREE_OPERAND (op0
, 0);
8914 || TREE_CODE (op00
) == PARM_DECL
8915 || TREE_CODE (op00
) == RESULT_DECL
)
8916 && !TREE_READONLY (op00
))
8923 } /* switch (code) */
8927 /* If the operation was a conversion do _not_ mark a resulting constant
8928 with TREE_OVERFLOW if the original constant was not. These conversions
8929 have implementation defined behavior and retaining the TREE_OVERFLOW
8930 flag here would confuse later passes such as VRP. */
8932 fold_unary_ignore_overflow_loc (location_t loc
, enum tree_code code
,
8933 tree type
, tree op0
)
8935 tree res
= fold_unary_loc (loc
, code
, type
, op0
);
8937 && TREE_CODE (res
) == INTEGER_CST
8938 && TREE_CODE (op0
) == INTEGER_CST
8939 && CONVERT_EXPR_CODE_P (code
))
8940 TREE_OVERFLOW (res
) = TREE_OVERFLOW (op0
);
8945 /* Fold a binary bitwise/truth expression of code CODE and type TYPE with
8946 operands OP0 and OP1. LOC is the location of the resulting expression.
8947 ARG0 and ARG1 are the NOP_STRIPed results of OP0 and OP1.
8948 Return the folded expression if folding is successful. Otherwise,
8949 return NULL_TREE. */
8951 fold_truth_andor (location_t loc
, enum tree_code code
, tree type
,
8952 tree arg0
, tree arg1
, tree op0
, tree op1
)
8956 /* We only do these simplifications if we are optimizing. */
8960 /* Check for things like (A || B) && (A || C). We can convert this
8961 to A || (B && C). Note that either operator can be any of the four
8962 truth and/or operations and the transformation will still be
8963 valid. Also note that we only care about order for the
8964 ANDIF and ORIF operators. If B contains side effects, this
8965 might change the truth-value of A. */
8966 if (TREE_CODE (arg0
) == TREE_CODE (arg1
)
8967 && (TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
8968 || TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
8969 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
8970 || TREE_CODE (arg0
) == TRUTH_OR_EXPR
)
8971 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg0
, 1)))
8973 tree a00
= TREE_OPERAND (arg0
, 0);
8974 tree a01
= TREE_OPERAND (arg0
, 1);
8975 tree a10
= TREE_OPERAND (arg1
, 0);
8976 tree a11
= TREE_OPERAND (arg1
, 1);
8977 int commutative
= ((TREE_CODE (arg0
) == TRUTH_OR_EXPR
8978 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
)
8979 && (code
== TRUTH_AND_EXPR
8980 || code
== TRUTH_OR_EXPR
));
8982 if (operand_equal_p (a00
, a10
, 0))
8983 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8984 fold_build2_loc (loc
, code
, type
, a01
, a11
));
8985 else if (commutative
&& operand_equal_p (a00
, a11
, 0))
8986 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8987 fold_build2_loc (loc
, code
, type
, a01
, a10
));
8988 else if (commutative
&& operand_equal_p (a01
, a10
, 0))
8989 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a01
,
8990 fold_build2_loc (loc
, code
, type
, a00
, a11
));
8992 /* This case if tricky because we must either have commutative
8993 operators or else A10 must not have side-effects. */
8995 else if ((commutative
|| ! TREE_SIDE_EFFECTS (a10
))
8996 && operand_equal_p (a01
, a11
, 0))
8997 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
8998 fold_build2_loc (loc
, code
, type
, a00
, a10
),
9002 /* See if we can build a range comparison. */
9003 if ((tem
= fold_range_test (loc
, code
, type
, op0
, op1
)) != 0)
9006 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
)
9007 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
))
9009 tem
= merge_truthop_with_opposite_arm (loc
, arg0
, arg1
, true);
9011 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
9014 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ORIF_EXPR
)
9015 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ANDIF_EXPR
))
9017 tem
= merge_truthop_with_opposite_arm (loc
, arg1
, arg0
, false);
9019 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
9022 /* Check for the possibility of merging component references. If our
9023 lhs is another similar operation, try to merge its rhs with our
9024 rhs. Then try to merge our lhs and rhs. */
9025 if (TREE_CODE (arg0
) == code
9026 && (tem
= fold_truth_andor_1 (loc
, code
, type
,
9027 TREE_OPERAND (arg0
, 1), arg1
)) != 0)
9028 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0), tem
);
9030 if ((tem
= fold_truth_andor_1 (loc
, code
, type
, arg0
, arg1
)) != 0)
9033 bool logical_op_non_short_circuit
= LOGICAL_OP_NON_SHORT_CIRCUIT
;
9034 if (param_logical_op_non_short_circuit
!= -1)
9035 logical_op_non_short_circuit
9036 = param_logical_op_non_short_circuit
;
9037 if (logical_op_non_short_circuit
9038 && !flag_sanitize_coverage
9039 && (code
== TRUTH_AND_EXPR
9040 || code
== TRUTH_ANDIF_EXPR
9041 || code
== TRUTH_OR_EXPR
9042 || code
== TRUTH_ORIF_EXPR
))
9044 enum tree_code ncode
, icode
;
9046 ncode
= (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_AND_EXPR
)
9047 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
;
9048 icode
= ncode
== TRUTH_AND_EXPR
? TRUTH_ANDIF_EXPR
: TRUTH_ORIF_EXPR
;
9050 /* Transform ((A AND-IF B) AND[-IF] C) into (A AND-IF (B AND C)),
9051 or ((A OR-IF B) OR[-IF] C) into (A OR-IF (B OR C))
9052 We don't want to pack more than two leafs to a non-IF AND/OR
9054 If tree-code of left-hand operand isn't an AND/OR-IF code and not
9055 equal to IF-CODE, then we don't want to add right-hand operand.
9056 If the inner right-hand side of left-hand operand has
9057 side-effects, or isn't simple, then we can't add to it,
9058 as otherwise we might destroy if-sequence. */
9059 if (TREE_CODE (arg0
) == icode
9060 && simple_operand_p_2 (arg1
)
9061 /* Needed for sequence points to handle trappings, and
9063 && simple_operand_p_2 (TREE_OPERAND (arg0
, 1)))
9065 tem
= fold_build2_loc (loc
, ncode
, type
, TREE_OPERAND (arg0
, 1),
9067 return fold_build2_loc (loc
, icode
, type
, TREE_OPERAND (arg0
, 0),
9070 /* Same as above but for (A AND[-IF] (B AND-IF C)) -> ((A AND B) AND-IF C),
9071 or (A OR[-IF] (B OR-IF C) -> ((A OR B) OR-IF C). */
9072 else if (TREE_CODE (arg1
) == icode
9073 && simple_operand_p_2 (arg0
)
9074 /* Needed for sequence points to handle trappings, and
9076 && simple_operand_p_2 (TREE_OPERAND (arg1
, 0)))
9078 tem
= fold_build2_loc (loc
, ncode
, type
,
9079 arg0
, TREE_OPERAND (arg1
, 0));
9080 return fold_build2_loc (loc
, icode
, type
, tem
,
9081 TREE_OPERAND (arg1
, 1));
9083 /* Transform (A AND-IF B) into (A AND B), or (A OR-IF B)
9085 For sequence point consistancy, we need to check for trapping,
9086 and side-effects. */
9087 else if (code
== icode
&& simple_operand_p_2 (arg0
)
9088 && simple_operand_p_2 (arg1
))
9089 return fold_build2_loc (loc
, ncode
, type
, arg0
, arg1
);
9095 /* Helper that tries to canonicalize the comparison ARG0 CODE ARG1
9096 by changing CODE to reduce the magnitude of constants involved in
9097 ARG0 of the comparison.
9098 Returns a canonicalized comparison tree if a simplification was
9099 possible, otherwise returns NULL_TREE.
9100 Set *STRICT_OVERFLOW_P to true if the canonicalization is only
9101 valid if signed overflow is undefined. */
9104 maybe_canonicalize_comparison_1 (location_t loc
, enum tree_code code
, tree type
,
9105 tree arg0
, tree arg1
,
9106 bool *strict_overflow_p
)
9108 enum tree_code code0
= TREE_CODE (arg0
);
9109 tree t
, cst0
= NULL_TREE
;
9112 /* Match A +- CST code arg1. We can change this only if overflow
9114 if (!((ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
9115 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
)))
9116 /* In principle pointers also have undefined overflow behavior,
9117 but that causes problems elsewhere. */
9118 && !POINTER_TYPE_P (TREE_TYPE (arg0
))
9119 && (code0
== MINUS_EXPR
9120 || code0
== PLUS_EXPR
)
9121 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
))
9124 /* Identify the constant in arg0 and its sign. */
9125 cst0
= TREE_OPERAND (arg0
, 1);
9126 sgn0
= tree_int_cst_sgn (cst0
);
9128 /* Overflowed constants and zero will cause problems. */
9129 if (integer_zerop (cst0
)
9130 || TREE_OVERFLOW (cst0
))
9133 /* See if we can reduce the magnitude of the constant in
9134 arg0 by changing the comparison code. */
9135 /* A - CST < arg1 -> A - CST-1 <= arg1. */
9137 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
9139 /* A + CST > arg1 -> A + CST-1 >= arg1. */
9140 else if (code
== GT_EXPR
9141 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
9143 /* A + CST <= arg1 -> A + CST-1 < arg1. */
9144 else if (code
== LE_EXPR
9145 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
9147 /* A - CST >= arg1 -> A - CST-1 > arg1. */
9148 else if (code
== GE_EXPR
9149 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
9153 *strict_overflow_p
= true;
9155 /* Now build the constant reduced in magnitude. But not if that
9156 would produce one outside of its types range. */
9157 if (INTEGRAL_TYPE_P (TREE_TYPE (cst0
))
9159 && TYPE_MIN_VALUE (TREE_TYPE (cst0
))
9160 && tree_int_cst_equal (cst0
, TYPE_MIN_VALUE (TREE_TYPE (cst0
))))
9162 && TYPE_MAX_VALUE (TREE_TYPE (cst0
))
9163 && tree_int_cst_equal (cst0
, TYPE_MAX_VALUE (TREE_TYPE (cst0
))))))
9166 t
= int_const_binop (sgn0
== -1 ? PLUS_EXPR
: MINUS_EXPR
,
9167 cst0
, build_int_cst (TREE_TYPE (cst0
), 1));
9168 t
= fold_build2_loc (loc
, code0
, TREE_TYPE (arg0
), TREE_OPERAND (arg0
, 0), t
);
9169 t
= fold_convert (TREE_TYPE (arg1
), t
);
9171 return fold_build2_loc (loc
, code
, type
, t
, arg1
);
9174 /* Canonicalize the comparison ARG0 CODE ARG1 with type TYPE with undefined
9175 overflow further. Try to decrease the magnitude of constants involved
9176 by changing LE_EXPR and GE_EXPR to LT_EXPR and GT_EXPR or vice versa
9177 and put sole constants at the second argument position.
9178 Returns the canonicalized tree if changed, otherwise NULL_TREE. */
9181 maybe_canonicalize_comparison (location_t loc
, enum tree_code code
, tree type
,
9182 tree arg0
, tree arg1
)
9185 bool strict_overflow_p
;
9186 const char * const warnmsg
= G_("assuming signed overflow does not occur "
9187 "when reducing constant in comparison");
9189 /* Try canonicalization by simplifying arg0. */
9190 strict_overflow_p
= false;
9191 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg0
, arg1
,
9192 &strict_overflow_p
);
9195 if (strict_overflow_p
)
9196 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
9200 /* Try canonicalization by simplifying arg1 using the swapped
9202 code
= swap_tree_comparison (code
);
9203 strict_overflow_p
= false;
9204 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg1
, arg0
,
9205 &strict_overflow_p
);
9206 if (t
&& strict_overflow_p
)
9207 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
9211 /* Return whether BASE + OFFSET + BITPOS may wrap around the address
9212 space. This is used to avoid issuing overflow warnings for
9213 expressions like &p->x which cannot wrap. */
9216 pointer_may_wrap_p (tree base
, tree offset
, poly_int64 bitpos
)
9218 if (!POINTER_TYPE_P (TREE_TYPE (base
)))
9221 if (maybe_lt (bitpos
, 0))
9224 poly_wide_int wi_offset
;
9225 int precision
= TYPE_PRECISION (TREE_TYPE (base
));
9226 if (offset
== NULL_TREE
)
9227 wi_offset
= wi::zero (precision
);
9228 else if (!poly_int_tree_p (offset
) || TREE_OVERFLOW (offset
))
9231 wi_offset
= wi::to_poly_wide (offset
);
9233 wi::overflow_type overflow
;
9234 poly_wide_int units
= wi::shwi (bits_to_bytes_round_down (bitpos
),
9236 poly_wide_int total
= wi::add (wi_offset
, units
, UNSIGNED
, &overflow
);
9240 poly_uint64 total_hwi
, size
;
9241 if (!total
.to_uhwi (&total_hwi
)
9242 || !poly_int_tree_p (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (base
))),
9244 || known_eq (size
, 0U))
9247 if (known_le (total_hwi
, size
))
9250 /* We can do slightly better for SIZE if we have an ADDR_EXPR of an
9252 if (TREE_CODE (base
) == ADDR_EXPR
9253 && poly_int_tree_p (TYPE_SIZE_UNIT (TREE_TYPE (TREE_OPERAND (base
, 0))),
9255 && maybe_ne (size
, 0U)
9256 && known_le (total_hwi
, size
))
9262 /* Return a positive integer when the symbol DECL is known to have
9263 a nonzero address, zero when it's known not to (e.g., it's a weak
9264 symbol), and a negative integer when the symbol is not yet in the
9265 symbol table and so whether or not its address is zero is unknown.
9266 For function local objects always return positive integer. */
9268 maybe_nonzero_address (tree decl
)
9270 if (DECL_P (decl
) && decl_in_symtab_p (decl
))
9271 if (struct symtab_node
*symbol
= symtab_node::get_create (decl
))
9272 return symbol
->nonzero_address ();
9274 /* Function local objects are never NULL. */
9276 && (DECL_CONTEXT (decl
)
9277 && TREE_CODE (DECL_CONTEXT (decl
)) == FUNCTION_DECL
9278 && auto_var_in_fn_p (decl
, DECL_CONTEXT (decl
))))
9284 /* Subroutine of fold_binary. This routine performs all of the
9285 transformations that are common to the equality/inequality
9286 operators (EQ_EXPR and NE_EXPR) and the ordering operators
9287 (LT_EXPR, LE_EXPR, GE_EXPR and GT_EXPR). Callers other than
9288 fold_binary should call fold_binary. Fold a comparison with
9289 tree code CODE and type TYPE with operands OP0 and OP1. Return
9290 the folded comparison or NULL_TREE. */
9293 fold_comparison (location_t loc
, enum tree_code code
, tree type
,
9296 const bool equality_code
= (code
== EQ_EXPR
|| code
== NE_EXPR
);
9297 tree arg0
, arg1
, tem
;
9302 STRIP_SIGN_NOPS (arg0
);
9303 STRIP_SIGN_NOPS (arg1
);
9305 /* For comparisons of pointers we can decompose it to a compile time
9306 comparison of the base objects and the offsets into the object.
9307 This requires at least one operand being an ADDR_EXPR or a
9308 POINTER_PLUS_EXPR to do more than the operand_equal_p test below. */
9309 if (POINTER_TYPE_P (TREE_TYPE (arg0
))
9310 && (TREE_CODE (arg0
) == ADDR_EXPR
9311 || TREE_CODE (arg1
) == ADDR_EXPR
9312 || TREE_CODE (arg0
) == POINTER_PLUS_EXPR
9313 || TREE_CODE (arg1
) == POINTER_PLUS_EXPR
))
9315 tree base0
, base1
, offset0
= NULL_TREE
, offset1
= NULL_TREE
;
9316 poly_int64 bitsize
, bitpos0
= 0, bitpos1
= 0;
9318 int volatilep
, reversep
, unsignedp
;
9319 bool indirect_base0
= false, indirect_base1
= false;
9321 /* Get base and offset for the access. Strip ADDR_EXPR for
9322 get_inner_reference, but put it back by stripping INDIRECT_REF
9323 off the base object if possible. indirect_baseN will be true
9324 if baseN is not an address but refers to the object itself. */
9326 if (TREE_CODE (arg0
) == ADDR_EXPR
)
9329 = get_inner_reference (TREE_OPERAND (arg0
, 0),
9330 &bitsize
, &bitpos0
, &offset0
, &mode
,
9331 &unsignedp
, &reversep
, &volatilep
);
9332 if (TREE_CODE (base0
) == INDIRECT_REF
)
9333 base0
= TREE_OPERAND (base0
, 0);
9335 indirect_base0
= true;
9337 else if (TREE_CODE (arg0
) == POINTER_PLUS_EXPR
)
9339 base0
= TREE_OPERAND (arg0
, 0);
9340 STRIP_SIGN_NOPS (base0
);
9341 if (TREE_CODE (base0
) == ADDR_EXPR
)
9344 = get_inner_reference (TREE_OPERAND (base0
, 0),
9345 &bitsize
, &bitpos0
, &offset0
, &mode
,
9346 &unsignedp
, &reversep
, &volatilep
);
9347 if (TREE_CODE (base0
) == INDIRECT_REF
)
9348 base0
= TREE_OPERAND (base0
, 0);
9350 indirect_base0
= true;
9352 if (offset0
== NULL_TREE
|| integer_zerop (offset0
))
9353 offset0
= TREE_OPERAND (arg0
, 1);
9355 offset0
= size_binop (PLUS_EXPR
, offset0
,
9356 TREE_OPERAND (arg0
, 1));
9357 if (poly_int_tree_p (offset0
))
9359 poly_offset_int tem
= wi::sext (wi::to_poly_offset (offset0
),
9360 TYPE_PRECISION (sizetype
));
9361 tem
<<= LOG2_BITS_PER_UNIT
;
9363 if (tem
.to_shwi (&bitpos0
))
9364 offset0
= NULL_TREE
;
9369 if (TREE_CODE (arg1
) == ADDR_EXPR
)
9372 = get_inner_reference (TREE_OPERAND (arg1
, 0),
9373 &bitsize
, &bitpos1
, &offset1
, &mode
,
9374 &unsignedp
, &reversep
, &volatilep
);
9375 if (TREE_CODE (base1
) == INDIRECT_REF
)
9376 base1
= TREE_OPERAND (base1
, 0);
9378 indirect_base1
= true;
9380 else if (TREE_CODE (arg1
) == POINTER_PLUS_EXPR
)
9382 base1
= TREE_OPERAND (arg1
, 0);
9383 STRIP_SIGN_NOPS (base1
);
9384 if (TREE_CODE (base1
) == ADDR_EXPR
)
9387 = get_inner_reference (TREE_OPERAND (base1
, 0),
9388 &bitsize
, &bitpos1
, &offset1
, &mode
,
9389 &unsignedp
, &reversep
, &volatilep
);
9390 if (TREE_CODE (base1
) == INDIRECT_REF
)
9391 base1
= TREE_OPERAND (base1
, 0);
9393 indirect_base1
= true;
9395 if (offset1
== NULL_TREE
|| integer_zerop (offset1
))
9396 offset1
= TREE_OPERAND (arg1
, 1);
9398 offset1
= size_binop (PLUS_EXPR
, offset1
,
9399 TREE_OPERAND (arg1
, 1));
9400 if (poly_int_tree_p (offset1
))
9402 poly_offset_int tem
= wi::sext (wi::to_poly_offset (offset1
),
9403 TYPE_PRECISION (sizetype
));
9404 tem
<<= LOG2_BITS_PER_UNIT
;
9406 if (tem
.to_shwi (&bitpos1
))
9407 offset1
= NULL_TREE
;
9411 /* If we have equivalent bases we might be able to simplify. */
9412 if (indirect_base0
== indirect_base1
9413 && operand_equal_p (base0
, base1
,
9414 indirect_base0
? OEP_ADDRESS_OF
: 0))
9416 /* We can fold this expression to a constant if the non-constant
9417 offset parts are equal. */
9418 if ((offset0
== offset1
9419 || (offset0
&& offset1
9420 && operand_equal_p (offset0
, offset1
, 0)))
9423 && (DECL_P (base0
) || CONSTANT_CLASS_P (base0
)))
9424 || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))))
9427 && maybe_ne (bitpos0
, bitpos1
)
9428 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
9429 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
9430 fold_overflow_warning (("assuming pointer wraparound does not "
9431 "occur when comparing P +- C1 with "
9433 WARN_STRICT_OVERFLOW_CONDITIONAL
);
9438 if (known_eq (bitpos0
, bitpos1
))
9439 return constant_boolean_node (true, type
);
9440 if (known_ne (bitpos0
, bitpos1
))
9441 return constant_boolean_node (false, type
);
9444 if (known_ne (bitpos0
, bitpos1
))
9445 return constant_boolean_node (true, type
);
9446 if (known_eq (bitpos0
, bitpos1
))
9447 return constant_boolean_node (false, type
);
9450 if (known_lt (bitpos0
, bitpos1
))
9451 return constant_boolean_node (true, type
);
9452 if (known_ge (bitpos0
, bitpos1
))
9453 return constant_boolean_node (false, type
);
9456 if (known_le (bitpos0
, bitpos1
))
9457 return constant_boolean_node (true, type
);
9458 if (known_gt (bitpos0
, bitpos1
))
9459 return constant_boolean_node (false, type
);
9462 if (known_ge (bitpos0
, bitpos1
))
9463 return constant_boolean_node (true, type
);
9464 if (known_lt (bitpos0
, bitpos1
))
9465 return constant_boolean_node (false, type
);
9468 if (known_gt (bitpos0
, bitpos1
))
9469 return constant_boolean_node (true, type
);
9470 if (known_le (bitpos0
, bitpos1
))
9471 return constant_boolean_node (false, type
);
9476 /* We can simplify the comparison to a comparison of the variable
9477 offset parts if the constant offset parts are equal.
9478 Be careful to use signed sizetype here because otherwise we
9479 mess with array offsets in the wrong way. This is possible
9480 because pointer arithmetic is restricted to retain within an
9481 object and overflow on pointer differences is undefined as of
9482 6.5.6/8 and /9 with respect to the signed ptrdiff_t. */
9483 else if (known_eq (bitpos0
, bitpos1
)
9486 && (DECL_P (base0
) || CONSTANT_CLASS_P (base0
)))
9487 || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))))
9489 /* By converting to signed sizetype we cover middle-end pointer
9490 arithmetic which operates on unsigned pointer types of size
9491 type size and ARRAY_REF offsets which are properly sign or
9492 zero extended from their type in case it is narrower than
9494 if (offset0
== NULL_TREE
)
9495 offset0
= build_int_cst (ssizetype
, 0);
9497 offset0
= fold_convert_loc (loc
, ssizetype
, offset0
);
9498 if (offset1
== NULL_TREE
)
9499 offset1
= build_int_cst (ssizetype
, 0);
9501 offset1
= fold_convert_loc (loc
, ssizetype
, offset1
);
9504 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
9505 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
9506 fold_overflow_warning (("assuming pointer wraparound does not "
9507 "occur when comparing P +- C1 with "
9509 WARN_STRICT_OVERFLOW_COMPARISON
);
9511 return fold_build2_loc (loc
, code
, type
, offset0
, offset1
);
9514 /* For equal offsets we can simplify to a comparison of the
9516 else if (known_eq (bitpos0
, bitpos1
)
9518 ? base0
!= TREE_OPERAND (arg0
, 0) : base0
!= arg0
)
9520 ? base1
!= TREE_OPERAND (arg1
, 0) : base1
!= arg1
)
9521 && ((offset0
== offset1
)
9522 || (offset0
&& offset1
9523 && operand_equal_p (offset0
, offset1
, 0))))
9526 base0
= build_fold_addr_expr_loc (loc
, base0
);
9528 base1
= build_fold_addr_expr_loc (loc
, base1
);
9529 return fold_build2_loc (loc
, code
, type
, base0
, base1
);
9531 /* Comparison between an ordinary (non-weak) symbol and a null
9532 pointer can be eliminated since such symbols must have a non
9533 null address. In C, relational expressions between pointers
9534 to objects and null pointers are undefined. The results
9535 below follow the C++ rules with the additional property that
9536 every object pointer compares greater than a null pointer.
9538 else if (((DECL_P (base0
)
9539 && maybe_nonzero_address (base0
) > 0
9540 /* Avoid folding references to struct members at offset 0 to
9541 prevent tests like '&ptr->firstmember == 0' from getting
9542 eliminated. When ptr is null, although the -> expression
9543 is strictly speaking invalid, GCC retains it as a matter
9544 of QoI. See PR c/44555. */
9545 && (offset0
== NULL_TREE
&& known_ne (bitpos0
, 0)))
9546 || CONSTANT_CLASS_P (base0
))
9548 /* The caller guarantees that when one of the arguments is
9549 constant (i.e., null in this case) it is second. */
9550 && integer_zerop (arg1
))
9557 return constant_boolean_node (false, type
);
9561 return constant_boolean_node (true, type
);
9568 /* Transform comparisons of the form X +- C1 CMP Y +- C2 to
9569 X CMP Y +- C2 +- C1 for signed X, Y. This is valid if
9570 the resulting offset is smaller in absolute value than the
9571 original one and has the same sign. */
9572 if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
9573 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))
9574 && (TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
9575 && (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
9576 && !TREE_OVERFLOW (TREE_OPERAND (arg0
, 1)))
9577 && (TREE_CODE (arg1
) == PLUS_EXPR
|| TREE_CODE (arg1
) == MINUS_EXPR
)
9578 && (TREE_CODE (TREE_OPERAND (arg1
, 1)) == INTEGER_CST
9579 && !TREE_OVERFLOW (TREE_OPERAND (arg1
, 1))))
9581 tree const1
= TREE_OPERAND (arg0
, 1);
9582 tree const2
= TREE_OPERAND (arg1
, 1);
9583 tree variable1
= TREE_OPERAND (arg0
, 0);
9584 tree variable2
= TREE_OPERAND (arg1
, 0);
9586 const char * const warnmsg
= G_("assuming signed overflow does not "
9587 "occur when combining constants around "
9590 /* Put the constant on the side where it doesn't overflow and is
9591 of lower absolute value and of same sign than before. */
9592 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
9593 ? MINUS_EXPR
: PLUS_EXPR
,
9595 if (!TREE_OVERFLOW (cst
)
9596 && tree_int_cst_compare (const2
, cst
) == tree_int_cst_sgn (const2
)
9597 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const2
))
9599 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
9600 return fold_build2_loc (loc
, code
, type
,
9602 fold_build2_loc (loc
, TREE_CODE (arg1
),
9607 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
9608 ? MINUS_EXPR
: PLUS_EXPR
,
9610 if (!TREE_OVERFLOW (cst
)
9611 && tree_int_cst_compare (const1
, cst
) == tree_int_cst_sgn (const1
)
9612 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const1
))
9614 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
9615 return fold_build2_loc (loc
, code
, type
,
9616 fold_build2_loc (loc
, TREE_CODE (arg0
),
9623 tem
= maybe_canonicalize_comparison (loc
, code
, type
, arg0
, arg1
);
9627 /* If we are comparing an expression that just has comparisons
9628 of two integer values, arithmetic expressions of those comparisons,
9629 and constants, we can simplify it. There are only three cases
9630 to check: the two values can either be equal, the first can be
9631 greater, or the second can be greater. Fold the expression for
9632 those three values. Since each value must be 0 or 1, we have
9633 eight possibilities, each of which corresponds to the constant 0
9634 or 1 or one of the six possible comparisons.
9636 This handles common cases like (a > b) == 0 but also handles
9637 expressions like ((x > y) - (y > x)) > 0, which supposedly
9638 occur in macroized code. */
9640 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) != INTEGER_CST
)
9642 tree cval1
= 0, cval2
= 0;
9644 if (twoval_comparison_p (arg0
, &cval1
, &cval2
)
9645 /* Don't handle degenerate cases here; they should already
9646 have been handled anyway. */
9647 && cval1
!= 0 && cval2
!= 0
9648 && ! (TREE_CONSTANT (cval1
) && TREE_CONSTANT (cval2
))
9649 && TREE_TYPE (cval1
) == TREE_TYPE (cval2
)
9650 && INTEGRAL_TYPE_P (TREE_TYPE (cval1
))
9651 && TYPE_MAX_VALUE (TREE_TYPE (cval1
))
9652 && TYPE_MAX_VALUE (TREE_TYPE (cval2
))
9653 && ! operand_equal_p (TYPE_MIN_VALUE (TREE_TYPE (cval1
)),
9654 TYPE_MAX_VALUE (TREE_TYPE (cval2
)), 0))
9656 tree maxval
= TYPE_MAX_VALUE (TREE_TYPE (cval1
));
9657 tree minval
= TYPE_MIN_VALUE (TREE_TYPE (cval1
));
9659 /* We can't just pass T to eval_subst in case cval1 or cval2
9660 was the same as ARG1. */
9663 = fold_build2_loc (loc
, code
, type
,
9664 eval_subst (loc
, arg0
, cval1
, maxval
,
9668 = fold_build2_loc (loc
, code
, type
,
9669 eval_subst (loc
, arg0
, cval1
, maxval
,
9673 = fold_build2_loc (loc
, code
, type
,
9674 eval_subst (loc
, arg0
, cval1
, minval
,
9678 /* All three of these results should be 0 or 1. Confirm they are.
9679 Then use those values to select the proper code to use. */
9681 if (TREE_CODE (high_result
) == INTEGER_CST
9682 && TREE_CODE (equal_result
) == INTEGER_CST
9683 && TREE_CODE (low_result
) == INTEGER_CST
)
9685 /* Make a 3-bit mask with the high-order bit being the
9686 value for `>', the next for '=', and the low for '<'. */
9687 switch ((integer_onep (high_result
) * 4)
9688 + (integer_onep (equal_result
) * 2)
9689 + integer_onep (low_result
))
9693 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
9714 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
9717 return fold_build2_loc (loc
, code
, type
, cval1
, cval2
);
9726 /* Subroutine of fold_binary. Optimize complex multiplications of the
9727 form z * conj(z), as pow(realpart(z),2) + pow(imagpart(z),2). The
9728 argument EXPR represents the expression "z" of type TYPE. */
9731 fold_mult_zconjz (location_t loc
, tree type
, tree expr
)
9733 tree itype
= TREE_TYPE (type
);
9734 tree rpart
, ipart
, tem
;
9736 if (TREE_CODE (expr
) == COMPLEX_EXPR
)
9738 rpart
= TREE_OPERAND (expr
, 0);
9739 ipart
= TREE_OPERAND (expr
, 1);
9741 else if (TREE_CODE (expr
) == COMPLEX_CST
)
9743 rpart
= TREE_REALPART (expr
);
9744 ipart
= TREE_IMAGPART (expr
);
9748 expr
= save_expr (expr
);
9749 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, itype
, expr
);
9750 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, itype
, expr
);
9753 rpart
= save_expr (rpart
);
9754 ipart
= save_expr (ipart
);
9755 tem
= fold_build2_loc (loc
, PLUS_EXPR
, itype
,
9756 fold_build2_loc (loc
, MULT_EXPR
, itype
, rpart
, rpart
),
9757 fold_build2_loc (loc
, MULT_EXPR
, itype
, ipart
, ipart
));
9758 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, tem
,
9759 build_zero_cst (itype
));
9763 /* Helper function for fold_vec_perm. Store elements of VECTOR_CST or
9764 CONSTRUCTOR ARG into array ELTS, which has NELTS elements, and return
9765 true if successful. */
9768 vec_cst_ctor_to_array (tree arg
, unsigned int nelts
, tree
*elts
)
9770 unsigned HOST_WIDE_INT i
, nunits
;
9772 if (TREE_CODE (arg
) == VECTOR_CST
9773 && VECTOR_CST_NELTS (arg
).is_constant (&nunits
))
9775 for (i
= 0; i
< nunits
; ++i
)
9776 elts
[i
] = VECTOR_CST_ELT (arg
, i
);
9778 else if (TREE_CODE (arg
) == CONSTRUCTOR
)
9780 constructor_elt
*elt
;
9782 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (arg
), i
, elt
)
9783 if (i
>= nelts
|| TREE_CODE (TREE_TYPE (elt
->value
)) == VECTOR_TYPE
)
9786 elts
[i
] = elt
->value
;
9790 for (; i
< nelts
; i
++)
9792 = fold_convert (TREE_TYPE (TREE_TYPE (arg
)), integer_zero_node
);
9796 /* Attempt to fold vector permutation of ARG0 and ARG1 vectors using SEL
9797 selector. Return the folded VECTOR_CST or CONSTRUCTOR if successful,
9798 NULL_TREE otherwise. */
9801 fold_vec_perm (tree type
, tree arg0
, tree arg1
, const vec_perm_indices
&sel
)
9804 unsigned HOST_WIDE_INT nelts
;
9805 bool need_ctor
= false;
9807 if (!sel
.length ().is_constant (&nelts
))
9809 gcc_assert (known_eq (TYPE_VECTOR_SUBPARTS (type
), nelts
)
9810 && known_eq (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)), nelts
)
9811 && known_eq (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)), nelts
));
9812 if (TREE_TYPE (TREE_TYPE (arg0
)) != TREE_TYPE (type
)
9813 || TREE_TYPE (TREE_TYPE (arg1
)) != TREE_TYPE (type
))
9816 tree
*in_elts
= XALLOCAVEC (tree
, nelts
* 2);
9817 if (!vec_cst_ctor_to_array (arg0
, nelts
, in_elts
)
9818 || !vec_cst_ctor_to_array (arg1
, nelts
, in_elts
+ nelts
))
9821 tree_vector_builder
out_elts (type
, nelts
, 1);
9822 for (i
= 0; i
< nelts
; i
++)
9824 HOST_WIDE_INT index
;
9825 if (!sel
[i
].is_constant (&index
))
9827 if (!CONSTANT_CLASS_P (in_elts
[index
]))
9829 out_elts
.quick_push (unshare_expr (in_elts
[index
]));
9834 vec
<constructor_elt
, va_gc
> *v
;
9835 vec_alloc (v
, nelts
);
9836 for (i
= 0; i
< nelts
; i
++)
9837 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, out_elts
[i
]);
9838 return build_constructor (type
, v
);
9841 return out_elts
.build ();
9844 /* Try to fold a pointer difference of type TYPE two address expressions of
9845 array references AREF0 and AREF1 using location LOC. Return a
9846 simplified expression for the difference or NULL_TREE. */
9849 fold_addr_of_array_ref_difference (location_t loc
, tree type
,
9850 tree aref0
, tree aref1
,
9851 bool use_pointer_diff
)
9853 tree base0
= TREE_OPERAND (aref0
, 0);
9854 tree base1
= TREE_OPERAND (aref1
, 0);
9855 tree base_offset
= build_int_cst (type
, 0);
9857 /* If the bases are array references as well, recurse. If the bases
9858 are pointer indirections compute the difference of the pointers.
9859 If the bases are equal, we are set. */
9860 if ((TREE_CODE (base0
) == ARRAY_REF
9861 && TREE_CODE (base1
) == ARRAY_REF
9863 = fold_addr_of_array_ref_difference (loc
, type
, base0
, base1
,
9865 || (INDIRECT_REF_P (base0
)
9866 && INDIRECT_REF_P (base1
)
9869 ? fold_binary_loc (loc
, POINTER_DIFF_EXPR
, type
,
9870 TREE_OPERAND (base0
, 0),
9871 TREE_OPERAND (base1
, 0))
9872 : fold_binary_loc (loc
, MINUS_EXPR
, type
,
9874 TREE_OPERAND (base0
, 0)),
9876 TREE_OPERAND (base1
, 0)))))
9877 || operand_equal_p (base0
, base1
, OEP_ADDRESS_OF
))
9879 tree op0
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref0
, 1));
9880 tree op1
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref1
, 1));
9881 tree esz
= fold_convert_loc (loc
, type
, array_ref_element_size (aref0
));
9882 tree diff
= fold_build2_loc (loc
, MINUS_EXPR
, type
, op0
, op1
);
9883 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
9885 fold_build2_loc (loc
, MULT_EXPR
, type
,
9891 /* If the real or vector real constant CST of type TYPE has an exact
9892 inverse, return it, else return NULL. */
9895 exact_inverse (tree type
, tree cst
)
9901 switch (TREE_CODE (cst
))
9904 r
= TREE_REAL_CST (cst
);
9906 if (exact_real_inverse (TYPE_MODE (type
), &r
))
9907 return build_real (type
, r
);
9913 unit_type
= TREE_TYPE (type
);
9914 mode
= TYPE_MODE (unit_type
);
9916 tree_vector_builder elts
;
9917 if (!elts
.new_unary_operation (type
, cst
, false))
9919 unsigned int count
= elts
.encoded_nelts ();
9920 for (unsigned int i
= 0; i
< count
; ++i
)
9922 r
= TREE_REAL_CST (VECTOR_CST_ELT (cst
, i
));
9923 if (!exact_real_inverse (mode
, &r
))
9925 elts
.quick_push (build_real (unit_type
, r
));
9928 return elts
.build ();
9936 /* Mask out the tz least significant bits of X of type TYPE where
9937 tz is the number of trailing zeroes in Y. */
9939 mask_with_tz (tree type
, const wide_int
&x
, const wide_int
&y
)
9941 int tz
= wi::ctz (y
);
9943 return wi::mask (tz
, true, TYPE_PRECISION (type
)) & x
;
9947 /* Return true when T is an address and is known to be nonzero.
9948 For floating point we further ensure that T is not denormal.
9949 Similar logic is present in nonzero_address in rtlanal.h.
9951 If the return value is based on the assumption that signed overflow
9952 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
9953 change *STRICT_OVERFLOW_P. */
9956 tree_expr_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
9958 tree type
= TREE_TYPE (t
);
9959 enum tree_code code
;
9961 /* Doing something useful for floating point would need more work. */
9962 if (!INTEGRAL_TYPE_P (type
) && !POINTER_TYPE_P (type
))
9965 code
= TREE_CODE (t
);
9966 switch (TREE_CODE_CLASS (code
))
9969 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
9972 case tcc_comparison
:
9973 return tree_binary_nonzero_warnv_p (code
, type
,
9974 TREE_OPERAND (t
, 0),
9975 TREE_OPERAND (t
, 1),
9978 case tcc_declaration
:
9980 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
9988 case TRUTH_NOT_EXPR
:
9989 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
9992 case TRUTH_AND_EXPR
:
9994 case TRUTH_XOR_EXPR
:
9995 return tree_binary_nonzero_warnv_p (code
, type
,
9996 TREE_OPERAND (t
, 0),
9997 TREE_OPERAND (t
, 1),
10005 case WITH_SIZE_EXPR
:
10007 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
10009 case COMPOUND_EXPR
:
10012 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
10013 strict_overflow_p
);
10016 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 0),
10017 strict_overflow_p
);
10021 tree fndecl
= get_callee_fndecl (t
);
10022 if (!fndecl
) return false;
10023 if (flag_delete_null_pointer_checks
&& !flag_check_new
10024 && DECL_IS_OPERATOR_NEW_P (fndecl
)
10025 && !TREE_NOTHROW (fndecl
))
10027 if (flag_delete_null_pointer_checks
10028 && lookup_attribute ("returns_nonnull",
10029 TYPE_ATTRIBUTES (TREE_TYPE (fndecl
))))
10031 return alloca_call_p (t
);
10040 /* Return true when T is an address and is known to be nonzero.
10041 Handle warnings about undefined signed overflow. */
10044 tree_expr_nonzero_p (tree t
)
10046 bool ret
, strict_overflow_p
;
10048 strict_overflow_p
= false;
10049 ret
= tree_expr_nonzero_warnv_p (t
, &strict_overflow_p
);
10050 if (strict_overflow_p
)
10051 fold_overflow_warning (("assuming signed overflow does not occur when "
10052 "determining that expression is always "
10054 WARN_STRICT_OVERFLOW_MISC
);
10058 /* Return true if T is known not to be equal to an integer W. */
10061 expr_not_equal_to (tree t
, const wide_int
&w
)
10063 wide_int min
, max
, nz
;
10064 value_range_kind rtype
;
10065 switch (TREE_CODE (t
))
10068 return wi::to_wide (t
) != w
;
10071 if (!INTEGRAL_TYPE_P (TREE_TYPE (t
)))
10073 rtype
= get_range_info (t
, &min
, &max
);
10074 if (rtype
== VR_RANGE
)
10076 if (wi::lt_p (max
, w
, TYPE_SIGN (TREE_TYPE (t
))))
10078 if (wi::lt_p (w
, min
, TYPE_SIGN (TREE_TYPE (t
))))
10081 else if (rtype
== VR_ANTI_RANGE
10082 && wi::le_p (min
, w
, TYPE_SIGN (TREE_TYPE (t
)))
10083 && wi::le_p (w
, max
, TYPE_SIGN (TREE_TYPE (t
))))
10085 /* If T has some known zero bits and W has any of those bits set,
10086 then T is known not to be equal to W. */
10087 if (wi::ne_p (wi::zext (wi::bit_and_not (w
, get_nonzero_bits (t
)),
10088 TYPE_PRECISION (TREE_TYPE (t
))), 0))
10097 /* Fold a binary expression of code CODE and type TYPE with operands
10098 OP0 and OP1. LOC is the location of the resulting expression.
10099 Return the folded expression if folding is successful. Otherwise,
10100 return NULL_TREE. */
10103 fold_binary_loc (location_t loc
, enum tree_code code
, tree type
,
10104 tree op0
, tree op1
)
10106 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
10107 tree arg0
, arg1
, tem
;
10108 tree t1
= NULL_TREE
;
10109 bool strict_overflow_p
;
10112 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
10113 && TREE_CODE_LENGTH (code
) == 2
10114 && op0
!= NULL_TREE
10115 && op1
!= NULL_TREE
);
10120 /* Strip any conversions that don't change the mode. This is
10121 safe for every expression, except for a comparison expression
10122 because its signedness is derived from its operands. So, in
10123 the latter case, only strip conversions that don't change the
10124 signedness. MIN_EXPR/MAX_EXPR also need signedness of arguments
10127 Note that this is done as an internal manipulation within the
10128 constant folder, in order to find the simplest representation
10129 of the arguments so that their form can be studied. In any
10130 cases, the appropriate type conversions should be put back in
10131 the tree that will get out of the constant folder. */
10133 if (kind
== tcc_comparison
|| code
== MIN_EXPR
|| code
== MAX_EXPR
)
10135 STRIP_SIGN_NOPS (arg0
);
10136 STRIP_SIGN_NOPS (arg1
);
10144 /* Note that TREE_CONSTANT isn't enough: static var addresses are
10145 constant but we can't do arithmetic on them. */
10146 if (CONSTANT_CLASS_P (arg0
) && CONSTANT_CLASS_P (arg1
))
10148 tem
= const_binop (code
, type
, arg0
, arg1
);
10149 if (tem
!= NULL_TREE
)
10151 if (TREE_TYPE (tem
) != type
)
10152 tem
= fold_convert_loc (loc
, type
, tem
);
10157 /* If this is a commutative operation, and ARG0 is a constant, move it
10158 to ARG1 to reduce the number of tests below. */
10159 if (commutative_tree_code (code
)
10160 && tree_swap_operands_p (arg0
, arg1
))
10161 return fold_build2_loc (loc
, code
, type
, op1
, op0
);
10163 /* Likewise if this is a comparison, and ARG0 is a constant, move it
10164 to ARG1 to reduce the number of tests below. */
10165 if (kind
== tcc_comparison
10166 && tree_swap_operands_p (arg0
, arg1
))
10167 return fold_build2_loc (loc
, swap_tree_comparison (code
), type
, op1
, op0
);
10169 tem
= generic_simplify (loc
, code
, type
, op0
, op1
);
10173 /* ARG0 is the first operand of EXPR, and ARG1 is the second operand.
10175 First check for cases where an arithmetic operation is applied to a
10176 compound, conditional, or comparison operation. Push the arithmetic
10177 operation inside the compound or conditional to see if any folding
10178 can then be done. Convert comparison to conditional for this purpose.
10179 The also optimizes non-constant cases that used to be done in
10182 Before we do that, see if this is a BIT_AND_EXPR or a BIT_IOR_EXPR,
10183 one of the operands is a comparison and the other is a comparison, a
10184 BIT_AND_EXPR with the constant 1, or a truth value. In that case, the
10185 code below would make the expression more complex. Change it to a
10186 TRUTH_{AND,OR}_EXPR. Likewise, convert a similar NE_EXPR to
10187 TRUTH_XOR_EXPR and an EQ_EXPR to the inversion of a TRUTH_XOR_EXPR. */
10189 if ((code
== BIT_AND_EXPR
|| code
== BIT_IOR_EXPR
10190 || code
== EQ_EXPR
|| code
== NE_EXPR
)
10191 && !VECTOR_TYPE_P (TREE_TYPE (arg0
))
10192 && ((truth_value_p (TREE_CODE (arg0
))
10193 && (truth_value_p (TREE_CODE (arg1
))
10194 || (TREE_CODE (arg1
) == BIT_AND_EXPR
10195 && integer_onep (TREE_OPERAND (arg1
, 1)))))
10196 || (truth_value_p (TREE_CODE (arg1
))
10197 && (truth_value_p (TREE_CODE (arg0
))
10198 || (TREE_CODE (arg0
) == BIT_AND_EXPR
10199 && integer_onep (TREE_OPERAND (arg0
, 1)))))))
10201 tem
= fold_build2_loc (loc
, code
== BIT_AND_EXPR
? TRUTH_AND_EXPR
10202 : code
== BIT_IOR_EXPR
? TRUTH_OR_EXPR
10205 fold_convert_loc (loc
, boolean_type_node
, arg0
),
10206 fold_convert_loc (loc
, boolean_type_node
, arg1
));
10208 if (code
== EQ_EXPR
)
10209 tem
= invert_truthvalue_loc (loc
, tem
);
10211 return fold_convert_loc (loc
, type
, tem
);
10214 if (TREE_CODE_CLASS (code
) == tcc_binary
10215 || TREE_CODE_CLASS (code
) == tcc_comparison
)
10217 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
10219 tem
= fold_build2_loc (loc
, code
, type
,
10220 fold_convert_loc (loc
, TREE_TYPE (op0
),
10221 TREE_OPERAND (arg0
, 1)), op1
);
10222 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
10225 if (TREE_CODE (arg1
) == COMPOUND_EXPR
)
10227 tem
= fold_build2_loc (loc
, code
, type
, op0
,
10228 fold_convert_loc (loc
, TREE_TYPE (op1
),
10229 TREE_OPERAND (arg1
, 1)));
10230 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg1
, 0),
10234 if (TREE_CODE (arg0
) == COND_EXPR
10235 || TREE_CODE (arg0
) == VEC_COND_EXPR
10236 || COMPARISON_CLASS_P (arg0
))
10238 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
10240 /*cond_first_p=*/1);
10241 if (tem
!= NULL_TREE
)
10245 if (TREE_CODE (arg1
) == COND_EXPR
10246 || TREE_CODE (arg1
) == VEC_COND_EXPR
10247 || COMPARISON_CLASS_P (arg1
))
10249 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
10251 /*cond_first_p=*/0);
10252 if (tem
!= NULL_TREE
)
10260 /* MEM[&MEM[p, CST1], CST2] -> MEM[p, CST1 + CST2]. */
10261 if (TREE_CODE (arg0
) == ADDR_EXPR
10262 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == MEM_REF
)
10264 tree iref
= TREE_OPERAND (arg0
, 0);
10265 return fold_build2 (MEM_REF
, type
,
10266 TREE_OPERAND (iref
, 0),
10267 int_const_binop (PLUS_EXPR
, arg1
,
10268 TREE_OPERAND (iref
, 1)));
10271 /* MEM[&a.b, CST2] -> MEM[&a, offsetof (a, b) + CST2]. */
10272 if (TREE_CODE (arg0
) == ADDR_EXPR
10273 && handled_component_p (TREE_OPERAND (arg0
, 0)))
10276 poly_int64 coffset
;
10277 base
= get_addr_base_and_unit_offset (TREE_OPERAND (arg0
, 0),
10281 return fold_build2 (MEM_REF
, type
,
10282 build_fold_addr_expr (base
),
10283 int_const_binop (PLUS_EXPR
, arg1
,
10284 size_int (coffset
)));
10289 case POINTER_PLUS_EXPR
:
10290 /* INT +p INT -> (PTR)(INT + INT). Stripping types allows for this. */
10291 if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
10292 && INTEGRAL_TYPE_P (TREE_TYPE (arg0
)))
10293 return fold_convert_loc (loc
, type
,
10294 fold_build2_loc (loc
, PLUS_EXPR
, sizetype
,
10295 fold_convert_loc (loc
, sizetype
,
10297 fold_convert_loc (loc
, sizetype
,
10303 if (INTEGRAL_TYPE_P (type
) || VECTOR_INTEGER_TYPE_P (type
))
10305 /* X + (X / CST) * -CST is X % CST. */
10306 if (TREE_CODE (arg1
) == MULT_EXPR
10307 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == TRUNC_DIV_EXPR
10308 && operand_equal_p (arg0
,
10309 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0), 0))
10311 tree cst0
= TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1);
10312 tree cst1
= TREE_OPERAND (arg1
, 1);
10313 tree sum
= fold_binary_loc (loc
, PLUS_EXPR
, TREE_TYPE (cst1
),
10315 if (sum
&& integer_zerop (sum
))
10316 return fold_convert_loc (loc
, type
,
10317 fold_build2_loc (loc
, TRUNC_MOD_EXPR
,
10318 TREE_TYPE (arg0
), arg0
,
10323 /* Handle (A1 * C1) + (A2 * C2) with A1, A2 or C1, C2 being the same or
10324 one. Make sure the type is not saturating and has the signedness of
10325 the stripped operands, as fold_plusminus_mult_expr will re-associate.
10326 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
10327 if ((TREE_CODE (arg0
) == MULT_EXPR
10328 || TREE_CODE (arg1
) == MULT_EXPR
)
10329 && !TYPE_SATURATING (type
)
10330 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
10331 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
10332 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
10334 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
10339 if (! FLOAT_TYPE_P (type
))
10341 /* Reassociate (plus (plus (mult) (foo)) (mult)) as
10342 (plus (plus (mult) (mult)) (foo)) so that we can
10343 take advantage of the factoring cases below. */
10344 if (ANY_INTEGRAL_TYPE_P (type
)
10345 && TYPE_OVERFLOW_WRAPS (type
)
10346 && (((TREE_CODE (arg0
) == PLUS_EXPR
10347 || TREE_CODE (arg0
) == MINUS_EXPR
)
10348 && TREE_CODE (arg1
) == MULT_EXPR
)
10349 || ((TREE_CODE (arg1
) == PLUS_EXPR
10350 || TREE_CODE (arg1
) == MINUS_EXPR
)
10351 && TREE_CODE (arg0
) == MULT_EXPR
)))
10353 tree parg0
, parg1
, parg
, marg
;
10354 enum tree_code pcode
;
10356 if (TREE_CODE (arg1
) == MULT_EXPR
)
10357 parg
= arg0
, marg
= arg1
;
10359 parg
= arg1
, marg
= arg0
;
10360 pcode
= TREE_CODE (parg
);
10361 parg0
= TREE_OPERAND (parg
, 0);
10362 parg1
= TREE_OPERAND (parg
, 1);
10363 STRIP_NOPS (parg0
);
10364 STRIP_NOPS (parg1
);
10366 if (TREE_CODE (parg0
) == MULT_EXPR
10367 && TREE_CODE (parg1
) != MULT_EXPR
)
10368 return fold_build2_loc (loc
, pcode
, type
,
10369 fold_build2_loc (loc
, PLUS_EXPR
, type
,
10370 fold_convert_loc (loc
, type
,
10372 fold_convert_loc (loc
, type
,
10374 fold_convert_loc (loc
, type
, parg1
));
10375 if (TREE_CODE (parg0
) != MULT_EXPR
10376 && TREE_CODE (parg1
) == MULT_EXPR
)
10378 fold_build2_loc (loc
, PLUS_EXPR
, type
,
10379 fold_convert_loc (loc
, type
, parg0
),
10380 fold_build2_loc (loc
, pcode
, type
,
10381 fold_convert_loc (loc
, type
, marg
),
10382 fold_convert_loc (loc
, type
,
10388 /* Fold __complex__ ( x, 0 ) + __complex__ ( 0, y )
10389 to __complex__ ( x, y ). This is not the same for SNaNs or
10390 if signed zeros are involved. */
10391 if (!HONOR_SNANS (element_mode (arg0
))
10392 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10393 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
10395 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10396 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
10397 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
10398 bool arg0rz
= false, arg0iz
= false;
10399 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
10400 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
10402 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
10403 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
10404 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
10406 tree rp
= arg1r
? arg1r
10407 : build1 (REALPART_EXPR
, rtype
, arg1
);
10408 tree ip
= arg0i
? arg0i
10409 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
10410 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10412 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
10414 tree rp
= arg0r
? arg0r
10415 : build1 (REALPART_EXPR
, rtype
, arg0
);
10416 tree ip
= arg1i
? arg1i
10417 : build1 (IMAGPART_EXPR
, rtype
, arg1
);
10418 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10423 /* Convert a + (b*c + d*e) into (a + b*c) + d*e.
10424 We associate floats only if the user has specified
10425 -fassociative-math. */
10426 if (flag_associative_math
10427 && TREE_CODE (arg1
) == PLUS_EXPR
10428 && TREE_CODE (arg0
) != MULT_EXPR
)
10430 tree tree10
= TREE_OPERAND (arg1
, 0);
10431 tree tree11
= TREE_OPERAND (arg1
, 1);
10432 if (TREE_CODE (tree11
) == MULT_EXPR
10433 && TREE_CODE (tree10
) == MULT_EXPR
)
10436 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, arg0
, tree10
);
10437 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree0
, tree11
);
10440 /* Convert (b*c + d*e) + a into b*c + (d*e +a).
10441 We associate floats only if the user has specified
10442 -fassociative-math. */
10443 if (flag_associative_math
10444 && TREE_CODE (arg0
) == PLUS_EXPR
10445 && TREE_CODE (arg1
) != MULT_EXPR
)
10447 tree tree00
= TREE_OPERAND (arg0
, 0);
10448 tree tree01
= TREE_OPERAND (arg0
, 1);
10449 if (TREE_CODE (tree01
) == MULT_EXPR
10450 && TREE_CODE (tree00
) == MULT_EXPR
)
10453 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, tree01
, arg1
);
10454 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree00
, tree0
);
10460 /* (A << C1) + (A >> C2) if A is unsigned and C1+C2 is the size of A
10461 is a rotate of A by C1 bits. */
10462 /* (A << B) + (A >> (Z - B)) if A is unsigned and Z is the size of A
10463 is a rotate of A by B bits.
10464 Similarly for (A << B) | (A >> (-B & C3)) where C3 is Z-1,
10465 though in this case CODE must be | and not + or ^, otherwise
10466 it doesn't return A when B is 0. */
10468 enum tree_code code0
, code1
;
10470 code0
= TREE_CODE (arg0
);
10471 code1
= TREE_CODE (arg1
);
10472 if (((code0
== RSHIFT_EXPR
&& code1
== LSHIFT_EXPR
)
10473 || (code1
== RSHIFT_EXPR
&& code0
== LSHIFT_EXPR
))
10474 && operand_equal_p (TREE_OPERAND (arg0
, 0),
10475 TREE_OPERAND (arg1
, 0), 0)
10476 && (rtype
= TREE_TYPE (TREE_OPERAND (arg0
, 0)),
10477 TYPE_UNSIGNED (rtype
))
10478 /* Only create rotates in complete modes. Other cases are not
10479 expanded properly. */
10480 && (element_precision (rtype
)
10481 == GET_MODE_UNIT_PRECISION (TYPE_MODE (rtype
))))
10483 tree tree01
, tree11
;
10484 tree orig_tree01
, orig_tree11
;
10485 enum tree_code code01
, code11
;
10487 tree01
= orig_tree01
= TREE_OPERAND (arg0
, 1);
10488 tree11
= orig_tree11
= TREE_OPERAND (arg1
, 1);
10489 STRIP_NOPS (tree01
);
10490 STRIP_NOPS (tree11
);
10491 code01
= TREE_CODE (tree01
);
10492 code11
= TREE_CODE (tree11
);
10493 if (code11
!= MINUS_EXPR
10494 && (code01
== MINUS_EXPR
|| code01
== BIT_AND_EXPR
))
10496 std::swap (code0
, code1
);
10497 std::swap (code01
, code11
);
10498 std::swap (tree01
, tree11
);
10499 std::swap (orig_tree01
, orig_tree11
);
10501 if (code01
== INTEGER_CST
10502 && code11
== INTEGER_CST
10503 && (wi::to_widest (tree01
) + wi::to_widest (tree11
)
10504 == element_precision (rtype
)))
10506 tem
= build2_loc (loc
, LROTATE_EXPR
,
10507 rtype
, TREE_OPERAND (arg0
, 0),
10508 code0
== LSHIFT_EXPR
10509 ? orig_tree01
: orig_tree11
);
10510 return fold_convert_loc (loc
, type
, tem
);
10512 else if (code11
== MINUS_EXPR
)
10514 tree tree110
, tree111
;
10515 tree110
= TREE_OPERAND (tree11
, 0);
10516 tree111
= TREE_OPERAND (tree11
, 1);
10517 STRIP_NOPS (tree110
);
10518 STRIP_NOPS (tree111
);
10519 if (TREE_CODE (tree110
) == INTEGER_CST
10520 && compare_tree_int (tree110
,
10521 element_precision (rtype
)) == 0
10522 && operand_equal_p (tree01
, tree111
, 0))
10524 tem
= build2_loc (loc
, (code0
== LSHIFT_EXPR
10525 ? LROTATE_EXPR
: RROTATE_EXPR
),
10526 rtype
, TREE_OPERAND (arg0
, 0),
10528 return fold_convert_loc (loc
, type
, tem
);
10531 else if (code
== BIT_IOR_EXPR
10532 && code11
== BIT_AND_EXPR
10533 && pow2p_hwi (element_precision (rtype
)))
10535 tree tree110
, tree111
;
10536 tree110
= TREE_OPERAND (tree11
, 0);
10537 tree111
= TREE_OPERAND (tree11
, 1);
10538 STRIP_NOPS (tree110
);
10539 STRIP_NOPS (tree111
);
10540 if (TREE_CODE (tree110
) == NEGATE_EXPR
10541 && TREE_CODE (tree111
) == INTEGER_CST
10542 && compare_tree_int (tree111
,
10543 element_precision (rtype
) - 1) == 0
10544 && operand_equal_p (tree01
, TREE_OPERAND (tree110
, 0), 0))
10546 tem
= build2_loc (loc
, (code0
== LSHIFT_EXPR
10547 ? LROTATE_EXPR
: RROTATE_EXPR
),
10548 rtype
, TREE_OPERAND (arg0
, 0),
10550 return fold_convert_loc (loc
, type
, tem
);
10557 /* In most languages, can't associate operations on floats through
10558 parentheses. Rather than remember where the parentheses were, we
10559 don't associate floats at all, unless the user has specified
10560 -fassociative-math.
10561 And, we need to make sure type is not saturating. */
10563 if ((! FLOAT_TYPE_P (type
) || flag_associative_math
)
10564 && !TYPE_SATURATING (type
))
10566 tree var0
, minus_var0
, con0
, minus_con0
, lit0
, minus_lit0
;
10567 tree var1
, minus_var1
, con1
, minus_con1
, lit1
, minus_lit1
;
10571 /* Split both trees into variables, constants, and literals. Then
10572 associate each group together, the constants with literals,
10573 then the result with variables. This increases the chances of
10574 literals being recombined later and of generating relocatable
10575 expressions for the sum of a constant and literal. */
10576 var0
= split_tree (arg0
, type
, code
,
10577 &minus_var0
, &con0
, &minus_con0
,
10578 &lit0
, &minus_lit0
, 0);
10579 var1
= split_tree (arg1
, type
, code
,
10580 &minus_var1
, &con1
, &minus_con1
,
10581 &lit1
, &minus_lit1
, code
== MINUS_EXPR
);
10583 /* Recombine MINUS_EXPR operands by using PLUS_EXPR. */
10584 if (code
== MINUS_EXPR
)
10587 /* With undefined overflow prefer doing association in a type
10588 which wraps on overflow, if that is one of the operand types. */
10589 if ((POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
))
10590 && !TYPE_OVERFLOW_WRAPS (type
))
10592 if (INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10593 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
)))
10594 atype
= TREE_TYPE (arg0
);
10595 else if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
10596 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1
)))
10597 atype
= TREE_TYPE (arg1
);
10598 gcc_assert (TYPE_PRECISION (atype
) == TYPE_PRECISION (type
));
10601 /* With undefined overflow we can only associate constants with one
10602 variable, and constants whose association doesn't overflow. */
10603 if ((POINTER_TYPE_P (atype
) || INTEGRAL_TYPE_P (atype
))
10604 && !TYPE_OVERFLOW_WRAPS (atype
))
10606 if ((var0
&& var1
) || (minus_var0
&& minus_var1
))
10608 /* ??? If split_tree would handle NEGATE_EXPR we could
10609 simply reject these cases and the allowed cases would
10610 be the var0/minus_var1 ones. */
10611 tree tmp0
= var0
? var0
: minus_var0
;
10612 tree tmp1
= var1
? var1
: minus_var1
;
10613 bool one_neg
= false;
10615 if (TREE_CODE (tmp0
) == NEGATE_EXPR
)
10617 tmp0
= TREE_OPERAND (tmp0
, 0);
10618 one_neg
= !one_neg
;
10620 if (CONVERT_EXPR_P (tmp0
)
10621 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
10622 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
10623 <= TYPE_PRECISION (atype
)))
10624 tmp0
= TREE_OPERAND (tmp0
, 0);
10625 if (TREE_CODE (tmp1
) == NEGATE_EXPR
)
10627 tmp1
= TREE_OPERAND (tmp1
, 0);
10628 one_neg
= !one_neg
;
10630 if (CONVERT_EXPR_P (tmp1
)
10631 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
10632 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
10633 <= TYPE_PRECISION (atype
)))
10634 tmp1
= TREE_OPERAND (tmp1
, 0);
10635 /* The only case we can still associate with two variables
10636 is if they cancel out. */
10638 || !operand_equal_p (tmp0
, tmp1
, 0))
10641 else if ((var0
&& minus_var1
10642 && ! operand_equal_p (var0
, minus_var1
, 0))
10643 || (minus_var0
&& var1
10644 && ! operand_equal_p (minus_var0
, var1
, 0)))
10648 /* Only do something if we found more than two objects. Otherwise,
10649 nothing has changed and we risk infinite recursion. */
10651 && ((var0
!= 0) + (var1
!= 0)
10652 + (minus_var0
!= 0) + (minus_var1
!= 0)
10653 + (con0
!= 0) + (con1
!= 0)
10654 + (minus_con0
!= 0) + (minus_con1
!= 0)
10655 + (lit0
!= 0) + (lit1
!= 0)
10656 + (minus_lit0
!= 0) + (minus_lit1
!= 0)) > 2)
10658 var0
= associate_trees (loc
, var0
, var1
, code
, atype
);
10659 minus_var0
= associate_trees (loc
, minus_var0
, minus_var1
,
10661 con0
= associate_trees (loc
, con0
, con1
, code
, atype
);
10662 minus_con0
= associate_trees (loc
, minus_con0
, minus_con1
,
10664 lit0
= associate_trees (loc
, lit0
, lit1
, code
, atype
);
10665 minus_lit0
= associate_trees (loc
, minus_lit0
, minus_lit1
,
10668 if (minus_var0
&& var0
)
10670 var0
= associate_trees (loc
, var0
, minus_var0
,
10671 MINUS_EXPR
, atype
);
10674 if (minus_con0
&& con0
)
10676 con0
= associate_trees (loc
, con0
, minus_con0
,
10677 MINUS_EXPR
, atype
);
10681 /* Preserve the MINUS_EXPR if the negative part of the literal is
10682 greater than the positive part. Otherwise, the multiplicative
10683 folding code (i.e extract_muldiv) may be fooled in case
10684 unsigned constants are subtracted, like in the following
10685 example: ((X*2 + 4) - 8U)/2. */
10686 if (minus_lit0
&& lit0
)
10688 if (TREE_CODE (lit0
) == INTEGER_CST
10689 && TREE_CODE (minus_lit0
) == INTEGER_CST
10690 && tree_int_cst_lt (lit0
, minus_lit0
)
10691 /* But avoid ending up with only negated parts. */
10694 minus_lit0
= associate_trees (loc
, minus_lit0
, lit0
,
10695 MINUS_EXPR
, atype
);
10700 lit0
= associate_trees (loc
, lit0
, minus_lit0
,
10701 MINUS_EXPR
, atype
);
10706 /* Don't introduce overflows through reassociation. */
10707 if ((lit0
&& TREE_OVERFLOW_P (lit0
))
10708 || (minus_lit0
&& TREE_OVERFLOW_P (minus_lit0
)))
10711 /* Eliminate lit0 and minus_lit0 to con0 and minus_con0. */
10712 con0
= associate_trees (loc
, con0
, lit0
, code
, atype
);
10714 minus_con0
= associate_trees (loc
, minus_con0
, minus_lit0
,
10718 /* Eliminate minus_con0. */
10722 con0
= associate_trees (loc
, con0
, minus_con0
,
10723 MINUS_EXPR
, atype
);
10725 var0
= associate_trees (loc
, var0
, minus_con0
,
10726 MINUS_EXPR
, atype
);
10728 gcc_unreachable ();
10732 /* Eliminate minus_var0. */
10736 con0
= associate_trees (loc
, con0
, minus_var0
,
10737 MINUS_EXPR
, atype
);
10739 gcc_unreachable ();
10744 fold_convert_loc (loc
, type
, associate_trees (loc
, var0
, con0
,
10751 case POINTER_DIFF_EXPR
:
10753 /* Fold &a[i] - &a[j] to i-j. */
10754 if (TREE_CODE (arg0
) == ADDR_EXPR
10755 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == ARRAY_REF
10756 && TREE_CODE (arg1
) == ADDR_EXPR
10757 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == ARRAY_REF
)
10759 tree tem
= fold_addr_of_array_ref_difference (loc
, type
,
10760 TREE_OPERAND (arg0
, 0),
10761 TREE_OPERAND (arg1
, 0),
10763 == POINTER_DIFF_EXPR
);
10768 /* Further transformations are not for pointers. */
10769 if (code
== POINTER_DIFF_EXPR
)
10772 /* (-A) - B -> (-B) - A where B is easily negated and we can swap. */
10773 if (TREE_CODE (arg0
) == NEGATE_EXPR
10774 && negate_expr_p (op1
)
10775 /* If arg0 is e.g. unsigned int and type is int, then this could
10776 introduce UB, because if A is INT_MIN at runtime, the original
10777 expression can be well defined while the latter is not.
10779 && !(ANY_INTEGRAL_TYPE_P (type
)
10780 && TYPE_OVERFLOW_UNDEFINED (type
)
10781 && ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10782 && !TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))))
10783 return fold_build2_loc (loc
, MINUS_EXPR
, type
, negate_expr (op1
),
10784 fold_convert_loc (loc
, type
,
10785 TREE_OPERAND (arg0
, 0)));
10787 /* Fold __complex__ ( x, 0 ) - __complex__ ( 0, y ) to
10788 __complex__ ( x, -y ). This is not the same for SNaNs or if
10789 signed zeros are involved. */
10790 if (!HONOR_SNANS (element_mode (arg0
))
10791 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10792 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
10794 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10795 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
10796 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
10797 bool arg0rz
= false, arg0iz
= false;
10798 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
10799 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
10801 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
10802 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
10803 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
10805 tree rp
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
10807 : build1 (REALPART_EXPR
, rtype
, arg1
));
10808 tree ip
= arg0i
? arg0i
10809 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
10810 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10812 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
10814 tree rp
= arg0r
? arg0r
10815 : build1 (REALPART_EXPR
, rtype
, arg0
);
10816 tree ip
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
10818 : build1 (IMAGPART_EXPR
, rtype
, arg1
));
10819 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10824 /* A - B -> A + (-B) if B is easily negatable. */
10825 if (negate_expr_p (op1
)
10826 && ! TYPE_OVERFLOW_SANITIZED (type
)
10827 && ((FLOAT_TYPE_P (type
)
10828 /* Avoid this transformation if B is a positive REAL_CST. */
10829 && (TREE_CODE (op1
) != REAL_CST
10830 || REAL_VALUE_NEGATIVE (TREE_REAL_CST (op1
))))
10831 || INTEGRAL_TYPE_P (type
)))
10832 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
10833 fold_convert_loc (loc
, type
, arg0
),
10834 negate_expr (op1
));
10836 /* Handle (A1 * C1) - (A2 * C2) with A1, A2 or C1, C2 being the same or
10837 one. Make sure the type is not saturating and has the signedness of
10838 the stripped operands, as fold_plusminus_mult_expr will re-associate.
10839 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
10840 if ((TREE_CODE (arg0
) == MULT_EXPR
10841 || TREE_CODE (arg1
) == MULT_EXPR
)
10842 && !TYPE_SATURATING (type
)
10843 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
10844 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
10845 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
10847 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
10855 if (! FLOAT_TYPE_P (type
))
10857 /* Transform x * -C into -x * C if x is easily negatable. */
10858 if (TREE_CODE (op1
) == INTEGER_CST
10859 && tree_int_cst_sgn (op1
) == -1
10860 && negate_expr_p (op0
)
10861 && negate_expr_p (op1
)
10862 && (tem
= negate_expr (op1
)) != op1
10863 && ! TREE_OVERFLOW (tem
))
10864 return fold_build2_loc (loc
, MULT_EXPR
, type
,
10865 fold_convert_loc (loc
, type
,
10866 negate_expr (op0
)), tem
);
10868 strict_overflow_p
= false;
10869 if (TREE_CODE (arg1
) == INTEGER_CST
10870 && (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
10871 &strict_overflow_p
)) != 0)
10873 if (strict_overflow_p
)
10874 fold_overflow_warning (("assuming signed overflow does not "
10875 "occur when simplifying "
10877 WARN_STRICT_OVERFLOW_MISC
);
10878 return fold_convert_loc (loc
, type
, tem
);
10881 /* Optimize z * conj(z) for integer complex numbers. */
10882 if (TREE_CODE (arg0
) == CONJ_EXPR
10883 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10884 return fold_mult_zconjz (loc
, type
, arg1
);
10885 if (TREE_CODE (arg1
) == CONJ_EXPR
10886 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10887 return fold_mult_zconjz (loc
, type
, arg0
);
10891 /* Fold z * +-I to __complex__ (-+__imag z, +-__real z).
10892 This is not the same for NaNs or if signed zeros are
10894 if (!HONOR_NANS (arg0
)
10895 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10896 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
))
10897 && TREE_CODE (arg1
) == COMPLEX_CST
10898 && real_zerop (TREE_REALPART (arg1
)))
10900 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10901 if (real_onep (TREE_IMAGPART (arg1
)))
10903 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
10904 negate_expr (fold_build1_loc (loc
, IMAGPART_EXPR
,
10906 fold_build1_loc (loc
, REALPART_EXPR
, rtype
, arg0
));
10907 else if (real_minus_onep (TREE_IMAGPART (arg1
)))
10909 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
10910 fold_build1_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
),
10911 negate_expr (fold_build1_loc (loc
, REALPART_EXPR
,
10915 /* Optimize z * conj(z) for floating point complex numbers.
10916 Guarded by flag_unsafe_math_optimizations as non-finite
10917 imaginary components don't produce scalar results. */
10918 if (flag_unsafe_math_optimizations
10919 && TREE_CODE (arg0
) == CONJ_EXPR
10920 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10921 return fold_mult_zconjz (loc
, type
, arg1
);
10922 if (flag_unsafe_math_optimizations
10923 && TREE_CODE (arg1
) == CONJ_EXPR
10924 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10925 return fold_mult_zconjz (loc
, type
, arg0
);
10930 /* Canonicalize (X & C1) | C2. */
10931 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10932 && TREE_CODE (arg1
) == INTEGER_CST
10933 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
10935 int width
= TYPE_PRECISION (type
), w
;
10936 wide_int c1
= wi::to_wide (TREE_OPERAND (arg0
, 1));
10937 wide_int c2
= wi::to_wide (arg1
);
10939 /* If (C1&C2) == C1, then (X&C1)|C2 becomes (X,C2). */
10940 if ((c1
& c2
) == c1
)
10941 return omit_one_operand_loc (loc
, type
, arg1
,
10942 TREE_OPERAND (arg0
, 0));
10944 wide_int msk
= wi::mask (width
, false,
10945 TYPE_PRECISION (TREE_TYPE (arg1
)));
10947 /* If (C1|C2) == ~0 then (X&C1)|C2 becomes X|C2. */
10948 if (wi::bit_and_not (msk
, c1
| c2
) == 0)
10950 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10951 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
, tem
, arg1
);
10954 /* Minimize the number of bits set in C1, i.e. C1 := C1 & ~C2,
10955 unless (C1 & ~C2) | (C2 & C3) for some C3 is a mask of some
10956 mode which allows further optimizations. */
10959 wide_int c3
= wi::bit_and_not (c1
, c2
);
10960 for (w
= BITS_PER_UNIT
; w
<= width
; w
<<= 1)
10962 wide_int mask
= wi::mask (w
, false,
10963 TYPE_PRECISION (type
));
10964 if (((c1
| c2
) & mask
) == mask
10965 && wi::bit_and_not (c1
, mask
) == 0)
10974 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10975 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, type
, tem
,
10976 wide_int_to_tree (type
, c3
));
10977 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
, tem
, arg1
);
10981 /* See if this can be simplified into a rotate first. If that
10982 is unsuccessful continue in the association code. */
10986 /* Fold (X & 1) ^ 1 as (X & 1) == 0. */
10987 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10988 && INTEGRAL_TYPE_P (type
)
10989 && integer_onep (TREE_OPERAND (arg0
, 1))
10990 && integer_onep (arg1
))
10991 return fold_build2_loc (loc
, EQ_EXPR
, type
, arg0
,
10992 build_zero_cst (TREE_TYPE (arg0
)));
10994 /* See if this can be simplified into a rotate first. If that
10995 is unsuccessful continue in the association code. */
10999 /* Fold (X ^ 1) & 1 as (X & 1) == 0. */
11000 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11001 && INTEGRAL_TYPE_P (type
)
11002 && integer_onep (TREE_OPERAND (arg0
, 1))
11003 && integer_onep (arg1
))
11006 tem
= TREE_OPERAND (arg0
, 0);
11007 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
11008 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
11010 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
11011 build_zero_cst (TREE_TYPE (tem
)));
11013 /* Fold ~X & 1 as (X & 1) == 0. */
11014 if (TREE_CODE (arg0
) == BIT_NOT_EXPR
11015 && INTEGRAL_TYPE_P (type
)
11016 && integer_onep (arg1
))
11019 tem
= TREE_OPERAND (arg0
, 0);
11020 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
11021 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
11023 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
11024 build_zero_cst (TREE_TYPE (tem
)));
11026 /* Fold !X & 1 as X == 0. */
11027 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11028 && integer_onep (arg1
))
11030 tem
= TREE_OPERAND (arg0
, 0);
11031 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem
,
11032 build_zero_cst (TREE_TYPE (tem
)));
11035 /* Fold (X * Y) & -(1 << CST) to X * Y if Y is a constant
11036 multiple of 1 << CST. */
11037 if (TREE_CODE (arg1
) == INTEGER_CST
)
11039 wi::tree_to_wide_ref cst1
= wi::to_wide (arg1
);
11040 wide_int ncst1
= -cst1
;
11041 if ((cst1
& ncst1
) == ncst1
11042 && multiple_of_p (type
, arg0
,
11043 wide_int_to_tree (TREE_TYPE (arg1
), ncst1
)))
11044 return fold_convert_loc (loc
, type
, arg0
);
11047 /* Fold (X * CST1) & CST2 to zero if we can, or drop known zero
11049 if (TREE_CODE (arg1
) == INTEGER_CST
11050 && TREE_CODE (arg0
) == MULT_EXPR
11051 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11053 wi::tree_to_wide_ref warg1
= wi::to_wide (arg1
);
11055 = mask_with_tz (type
, warg1
, wi::to_wide (TREE_OPERAND (arg0
, 1)));
11058 return omit_two_operands_loc (loc
, type
, build_zero_cst (type
),
11060 else if (masked
!= warg1
)
11062 /* Avoid the transform if arg1 is a mask of some
11063 mode which allows further optimizations. */
11064 int pop
= wi::popcount (warg1
);
11065 if (!(pop
>= BITS_PER_UNIT
11067 && wi::mask (pop
, false, warg1
.get_precision ()) == warg1
))
11068 return fold_build2_loc (loc
, code
, type
, op0
,
11069 wide_int_to_tree (type
, masked
));
11073 /* Simplify ((int)c & 0377) into (int)c, if c is unsigned char. */
11074 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) == NOP_EXPR
11075 && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg0
, 0))))
11077 prec
= element_precision (TREE_TYPE (TREE_OPERAND (arg0
, 0)));
11079 wide_int mask
= wide_int::from (wi::to_wide (arg1
), prec
, UNSIGNED
);
11082 fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11088 /* Don't touch a floating-point divide by zero unless the mode
11089 of the constant can represent infinity. */
11090 if (TREE_CODE (arg1
) == REAL_CST
11091 && !MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (arg1
)))
11092 && real_zerop (arg1
))
11095 /* (-A) / (-B) -> A / B */
11096 if (TREE_CODE (arg0
) == NEGATE_EXPR
&& negate_expr_p (arg1
))
11097 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11098 TREE_OPERAND (arg0
, 0),
11099 negate_expr (arg1
));
11100 if (TREE_CODE (arg1
) == NEGATE_EXPR
&& negate_expr_p (arg0
))
11101 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11102 negate_expr (arg0
),
11103 TREE_OPERAND (arg1
, 0));
11106 case TRUNC_DIV_EXPR
:
11109 case FLOOR_DIV_EXPR
:
11110 /* Simplify A / (B << N) where A and B are positive and B is
11111 a power of 2, to A >> (N + log2(B)). */
11112 strict_overflow_p
= false;
11113 if (TREE_CODE (arg1
) == LSHIFT_EXPR
11114 && (TYPE_UNSIGNED (type
)
11115 || tree_expr_nonnegative_warnv_p (op0
, &strict_overflow_p
)))
11117 tree sval
= TREE_OPERAND (arg1
, 0);
11118 if (integer_pow2p (sval
) && tree_int_cst_sgn (sval
) > 0)
11120 tree sh_cnt
= TREE_OPERAND (arg1
, 1);
11121 tree pow2
= build_int_cst (TREE_TYPE (sh_cnt
),
11122 wi::exact_log2 (wi::to_wide (sval
)));
11124 if (strict_overflow_p
)
11125 fold_overflow_warning (("assuming signed overflow does not "
11126 "occur when simplifying A / (B << N)"),
11127 WARN_STRICT_OVERFLOW_MISC
);
11129 sh_cnt
= fold_build2_loc (loc
, PLUS_EXPR
, TREE_TYPE (sh_cnt
),
11131 return fold_build2_loc (loc
, RSHIFT_EXPR
, type
,
11132 fold_convert_loc (loc
, type
, arg0
), sh_cnt
);
11138 case ROUND_DIV_EXPR
:
11139 case CEIL_DIV_EXPR
:
11140 case EXACT_DIV_EXPR
:
11141 if (integer_zerop (arg1
))
11144 /* Convert -A / -B to A / B when the type is signed and overflow is
11146 if ((!INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
11147 && TREE_CODE (op0
) == NEGATE_EXPR
11148 && negate_expr_p (op1
))
11150 if (INTEGRAL_TYPE_P (type
))
11151 fold_overflow_warning (("assuming signed overflow does not occur "
11152 "when distributing negation across "
11154 WARN_STRICT_OVERFLOW_MISC
);
11155 return fold_build2_loc (loc
, code
, type
,
11156 fold_convert_loc (loc
, type
,
11157 TREE_OPERAND (arg0
, 0)),
11158 negate_expr (op1
));
11160 if ((!INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
11161 && TREE_CODE (arg1
) == NEGATE_EXPR
11162 && negate_expr_p (op0
))
11164 if (INTEGRAL_TYPE_P (type
))
11165 fold_overflow_warning (("assuming signed overflow does not occur "
11166 "when distributing negation across "
11168 WARN_STRICT_OVERFLOW_MISC
);
11169 return fold_build2_loc (loc
, code
, type
,
11171 fold_convert_loc (loc
, type
,
11172 TREE_OPERAND (arg1
, 0)));
11175 /* If arg0 is a multiple of arg1, then rewrite to the fastest div
11176 operation, EXACT_DIV_EXPR.
11178 Note that only CEIL_DIV_EXPR and FLOOR_DIV_EXPR are rewritten now.
11179 At one time others generated faster code, it's not clear if they do
11180 after the last round to changes to the DIV code in expmed.c. */
11181 if ((code
== CEIL_DIV_EXPR
|| code
== FLOOR_DIV_EXPR
)
11182 && multiple_of_p (type
, arg0
, arg1
))
11183 return fold_build2_loc (loc
, EXACT_DIV_EXPR
, type
,
11184 fold_convert (type
, arg0
),
11185 fold_convert (type
, arg1
));
11187 strict_overflow_p
= false;
11188 if (TREE_CODE (arg1
) == INTEGER_CST
11189 && (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
11190 &strict_overflow_p
)) != 0)
11192 if (strict_overflow_p
)
11193 fold_overflow_warning (("assuming signed overflow does not occur "
11194 "when simplifying division"),
11195 WARN_STRICT_OVERFLOW_MISC
);
11196 return fold_convert_loc (loc
, type
, tem
);
11201 case CEIL_MOD_EXPR
:
11202 case FLOOR_MOD_EXPR
:
11203 case ROUND_MOD_EXPR
:
11204 case TRUNC_MOD_EXPR
:
11205 strict_overflow_p
= false;
11206 if (TREE_CODE (arg1
) == INTEGER_CST
11207 && (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
11208 &strict_overflow_p
)) != 0)
11210 if (strict_overflow_p
)
11211 fold_overflow_warning (("assuming signed overflow does not occur "
11212 "when simplifying modulus"),
11213 WARN_STRICT_OVERFLOW_MISC
);
11214 return fold_convert_loc (loc
, type
, tem
);
11223 /* Since negative shift count is not well-defined,
11224 don't try to compute it in the compiler. */
11225 if (TREE_CODE (arg1
) == INTEGER_CST
&& tree_int_cst_sgn (arg1
) < 0)
11228 prec
= element_precision (type
);
11230 /* If we have a rotate of a bit operation with the rotate count and
11231 the second operand of the bit operation both constant,
11232 permute the two operations. */
11233 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
11234 && (TREE_CODE (arg0
) == BIT_AND_EXPR
11235 || TREE_CODE (arg0
) == BIT_IOR_EXPR
11236 || TREE_CODE (arg0
) == BIT_XOR_EXPR
)
11237 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11239 tree arg00
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11240 tree arg01
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
11241 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
11242 fold_build2_loc (loc
, code
, type
,
11244 fold_build2_loc (loc
, code
, type
,
11248 /* Two consecutive rotates adding up to the some integer
11249 multiple of the precision of the type can be ignored. */
11250 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
11251 && TREE_CODE (arg0
) == RROTATE_EXPR
11252 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
11253 && wi::umod_trunc (wi::to_wide (arg1
)
11254 + wi::to_wide (TREE_OPERAND (arg0
, 1)),
11256 return fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11264 case TRUTH_ANDIF_EXPR
:
11265 /* Note that the operands of this must be ints
11266 and their values must be 0 or 1.
11267 ("true" is a fixed value perhaps depending on the language.) */
11268 /* If first arg is constant zero, return it. */
11269 if (integer_zerop (arg0
))
11270 return fold_convert_loc (loc
, type
, arg0
);
11272 case TRUTH_AND_EXPR
:
11273 /* If either arg is constant true, drop it. */
11274 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11275 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
11276 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
)
11277 /* Preserve sequence points. */
11278 && (code
!= TRUTH_ANDIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
11279 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11280 /* If second arg is constant zero, result is zero, but first arg
11281 must be evaluated. */
11282 if (integer_zerop (arg1
))
11283 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
11284 /* Likewise for first arg, but note that only the TRUTH_AND_EXPR
11285 case will be handled here. */
11286 if (integer_zerop (arg0
))
11287 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
11289 /* !X && X is always false. */
11290 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11291 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11292 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg1
);
11293 /* X && !X is always false. */
11294 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11295 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11296 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
11298 /* A < X && A + 1 > Y ==> A < X && A >= Y. Normally A + 1 > Y
11299 means A >= Y && A != MAX, but in this case we know that
11302 if (!TREE_SIDE_EFFECTS (arg0
)
11303 && !TREE_SIDE_EFFECTS (arg1
))
11305 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg0
, arg1
);
11306 if (tem
&& !operand_equal_p (tem
, arg0
, 0))
11307 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
11309 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg1
, arg0
);
11310 if (tem
&& !operand_equal_p (tem
, arg1
, 0))
11311 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
11314 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
11320 case TRUTH_ORIF_EXPR
:
11321 /* Note that the operands of this must be ints
11322 and their values must be 0 or true.
11323 ("true" is a fixed value perhaps depending on the language.) */
11324 /* If first arg is constant true, return it. */
11325 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11326 return fold_convert_loc (loc
, type
, arg0
);
11328 case TRUTH_OR_EXPR
:
11329 /* If either arg is constant zero, drop it. */
11330 if (TREE_CODE (arg0
) == INTEGER_CST
&& integer_zerop (arg0
))
11331 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
11332 if (TREE_CODE (arg1
) == INTEGER_CST
&& integer_zerop (arg1
)
11333 /* Preserve sequence points. */
11334 && (code
!= TRUTH_ORIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
11335 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11336 /* If second arg is constant true, result is true, but we must
11337 evaluate first arg. */
11338 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
))
11339 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
11340 /* Likewise for first arg, but note this only occurs here for
11342 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11343 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
11345 /* !X || X is always true. */
11346 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11347 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11348 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
11349 /* X || !X is always true. */
11350 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11351 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11352 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
11354 /* (X && !Y) || (!X && Y) is X ^ Y */
11355 if (TREE_CODE (arg0
) == TRUTH_AND_EXPR
11356 && TREE_CODE (arg1
) == TRUTH_AND_EXPR
)
11358 tree a0
, a1
, l0
, l1
, n0
, n1
;
11360 a0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 0));
11361 a1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 1));
11363 l0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11364 l1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
11366 n0
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l0
);
11367 n1
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l1
);
11369 if ((operand_equal_p (n0
, a0
, 0)
11370 && operand_equal_p (n1
, a1
, 0))
11371 || (operand_equal_p (n0
, a1
, 0)
11372 && operand_equal_p (n1
, a0
, 0)))
11373 return fold_build2_loc (loc
, TRUTH_XOR_EXPR
, type
, l0
, n1
);
11376 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
11382 case TRUTH_XOR_EXPR
:
11383 /* If the second arg is constant zero, drop it. */
11384 if (integer_zerop (arg1
))
11385 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11386 /* If the second arg is constant true, this is a logical inversion. */
11387 if (integer_onep (arg1
))
11389 tem
= invert_truthvalue_loc (loc
, arg0
);
11390 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, tem
));
11392 /* Identical arguments cancel to zero. */
11393 if (operand_equal_p (arg0
, arg1
, 0))
11394 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
11396 /* !X ^ X is always true. */
11397 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11398 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11399 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
11401 /* X ^ !X is always true. */
11402 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11403 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11404 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
11413 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
11414 if (tem
!= NULL_TREE
)
11417 /* bool_var != 1 becomes !bool_var. */
11418 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_onep (arg1
)
11419 && code
== NE_EXPR
)
11420 return fold_convert_loc (loc
, type
,
11421 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
11422 TREE_TYPE (arg0
), arg0
));
11424 /* bool_var == 0 becomes !bool_var. */
11425 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_zerop (arg1
)
11426 && code
== EQ_EXPR
)
11427 return fold_convert_loc (loc
, type
,
11428 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
11429 TREE_TYPE (arg0
), arg0
));
11431 /* !exp != 0 becomes !exp */
11432 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
&& integer_zerop (arg1
)
11433 && code
== NE_EXPR
)
11434 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11436 /* If this is an EQ or NE comparison with zero and ARG0 is
11437 (1 << foo) & bar, convert it to (bar >> foo) & 1. Both require
11438 two operations, but the latter can be done in one less insn
11439 on machines that have only two-operand insns or on which a
11440 constant cannot be the first operand. */
11441 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11442 && integer_zerop (arg1
))
11444 tree arg00
= TREE_OPERAND (arg0
, 0);
11445 tree arg01
= TREE_OPERAND (arg0
, 1);
11446 if (TREE_CODE (arg00
) == LSHIFT_EXPR
11447 && integer_onep (TREE_OPERAND (arg00
, 0)))
11449 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg00
),
11450 arg01
, TREE_OPERAND (arg00
, 1));
11451 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
11452 build_int_cst (TREE_TYPE (arg0
), 1));
11453 return fold_build2_loc (loc
, code
, type
,
11454 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
11457 else if (TREE_CODE (arg01
) == LSHIFT_EXPR
11458 && integer_onep (TREE_OPERAND (arg01
, 0)))
11460 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg01
),
11461 arg00
, TREE_OPERAND (arg01
, 1));
11462 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
11463 build_int_cst (TREE_TYPE (arg0
), 1));
11464 return fold_build2_loc (loc
, code
, type
,
11465 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
11470 /* Fold ((X >> C1) & C2) == 0 and ((X >> C1) & C2) != 0 where
11471 C1 is a valid shift constant, and C2 is a power of two, i.e.
11473 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11474 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == RSHIFT_EXPR
11475 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1))
11477 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11478 && integer_zerop (arg1
))
11480 tree itype
= TREE_TYPE (arg0
);
11481 tree arg001
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1);
11482 prec
= TYPE_PRECISION (itype
);
11484 /* Check for a valid shift count. */
11485 if (wi::ltu_p (wi::to_wide (arg001
), prec
))
11487 tree arg01
= TREE_OPERAND (arg0
, 1);
11488 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
11489 unsigned HOST_WIDE_INT log2
= tree_log2 (arg01
);
11490 /* If (C2 << C1) doesn't overflow, then ((X >> C1) & C2) != 0
11491 can be rewritten as (X & (C2 << C1)) != 0. */
11492 if ((log2
+ TREE_INT_CST_LOW (arg001
)) < prec
)
11494 tem
= fold_build2_loc (loc
, LSHIFT_EXPR
, itype
, arg01
, arg001
);
11495 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, arg000
, tem
);
11496 return fold_build2_loc (loc
, code
, type
, tem
,
11497 fold_convert_loc (loc
, itype
, arg1
));
11499 /* Otherwise, for signed (arithmetic) shifts,
11500 ((X >> C1) & C2) != 0 is rewritten as X < 0, and
11501 ((X >> C1) & C2) == 0 is rewritten as X >= 0. */
11502 else if (!TYPE_UNSIGNED (itype
))
11503 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
, type
,
11504 arg000
, build_int_cst (itype
, 0));
11505 /* Otherwise, of unsigned (logical) shifts,
11506 ((X >> C1) & C2) != 0 is rewritten as (X,false), and
11507 ((X >> C1) & C2) == 0 is rewritten as (X,true). */
11509 return omit_one_operand_loc (loc
, type
,
11510 code
== EQ_EXPR
? integer_one_node
11511 : integer_zero_node
,
11516 /* If this is a comparison of a field, we may be able to simplify it. */
11517 if ((TREE_CODE (arg0
) == COMPONENT_REF
11518 || TREE_CODE (arg0
) == BIT_FIELD_REF
)
11519 /* Handle the constant case even without -O
11520 to make sure the warnings are given. */
11521 && (optimize
|| TREE_CODE (arg1
) == INTEGER_CST
))
11523 t1
= optimize_bit_field_compare (loc
, code
, type
, arg0
, arg1
);
11528 /* Optimize comparisons of strlen vs zero to a compare of the
11529 first character of the string vs zero. To wit,
11530 strlen(ptr) == 0 => *ptr == 0
11531 strlen(ptr) != 0 => *ptr != 0
11532 Other cases should reduce to one of these two (or a constant)
11533 due to the return value of strlen being unsigned. */
11534 if (TREE_CODE (arg0
) == CALL_EXPR
&& integer_zerop (arg1
))
11536 tree fndecl
= get_callee_fndecl (arg0
);
11539 && fndecl_built_in_p (fndecl
, BUILT_IN_STRLEN
)
11540 && call_expr_nargs (arg0
) == 1
11541 && (TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (arg0
, 0)))
11545 = build_pointer_type (build_qualified_type (char_type_node
,
11547 tree ptr
= fold_convert_loc (loc
, ptrtype
,
11548 CALL_EXPR_ARG (arg0
, 0));
11549 tree iref
= build_fold_indirect_ref_loc (loc
, ptr
);
11550 return fold_build2_loc (loc
, code
, type
, iref
,
11551 build_int_cst (TREE_TYPE (iref
), 0));
11555 /* Fold (X >> C) != 0 into X < 0 if C is one less than the width
11556 of X. Similarly fold (X >> C) == 0 into X >= 0. */
11557 if (TREE_CODE (arg0
) == RSHIFT_EXPR
11558 && integer_zerop (arg1
)
11559 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11561 tree arg00
= TREE_OPERAND (arg0
, 0);
11562 tree arg01
= TREE_OPERAND (arg0
, 1);
11563 tree itype
= TREE_TYPE (arg00
);
11564 if (wi::to_wide (arg01
) == element_precision (itype
) - 1)
11566 if (TYPE_UNSIGNED (itype
))
11568 itype
= signed_type_for (itype
);
11569 arg00
= fold_convert_loc (loc
, itype
, arg00
);
11571 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
11572 type
, arg00
, build_zero_cst (itype
));
11576 /* Fold (~X & C) == 0 into (X & C) != 0 and (~X & C) != 0 into
11577 (X & C) == 0 when C is a single bit. */
11578 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11579 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_NOT_EXPR
11580 && integer_zerop (arg1
)
11581 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
11583 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
),
11584 TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0),
11585 TREE_OPERAND (arg0
, 1));
11586 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
,
11588 fold_convert_loc (loc
, TREE_TYPE (arg0
),
11592 /* Fold ((X & C) ^ C) eq/ne 0 into (X & C) ne/eq 0, when the
11593 constant C is a power of two, i.e. a single bit. */
11594 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11595 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
11596 && integer_zerop (arg1
)
11597 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11598 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
11599 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
11601 tree arg00
= TREE_OPERAND (arg0
, 0);
11602 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
11603 arg00
, build_int_cst (TREE_TYPE (arg00
), 0));
11606 /* Likewise, fold ((X ^ C) & C) eq/ne 0 into (X & C) ne/eq 0,
11607 when is C is a power of two, i.e. a single bit. */
11608 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11609 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_XOR_EXPR
11610 && integer_zerop (arg1
)
11611 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11612 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
11613 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
11615 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
11616 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg000
),
11617 arg000
, TREE_OPERAND (arg0
, 1));
11618 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
11619 tem
, build_int_cst (TREE_TYPE (tem
), 0));
11622 if (integer_zerop (arg1
)
11623 && tree_expr_nonzero_p (arg0
))
11625 tree res
= constant_boolean_node (code
==NE_EXPR
, type
);
11626 return omit_one_operand_loc (loc
, type
, res
, arg0
);
11629 /* Fold (X & C) op (Y & C) as (X ^ Y) & C op 0", and symmetries. */
11630 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11631 && TREE_CODE (arg1
) == BIT_AND_EXPR
)
11633 tree arg00
= TREE_OPERAND (arg0
, 0);
11634 tree arg01
= TREE_OPERAND (arg0
, 1);
11635 tree arg10
= TREE_OPERAND (arg1
, 0);
11636 tree arg11
= TREE_OPERAND (arg1
, 1);
11637 tree itype
= TREE_TYPE (arg0
);
11639 if (operand_equal_p (arg01
, arg11
, 0))
11641 tem
= fold_convert_loc (loc
, itype
, arg10
);
11642 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
11643 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg01
);
11644 return fold_build2_loc (loc
, code
, type
, tem
,
11645 build_zero_cst (itype
));
11647 if (operand_equal_p (arg01
, arg10
, 0))
11649 tem
= fold_convert_loc (loc
, itype
, arg11
);
11650 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
11651 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg01
);
11652 return fold_build2_loc (loc
, code
, type
, tem
,
11653 build_zero_cst (itype
));
11655 if (operand_equal_p (arg00
, arg11
, 0))
11657 tem
= fold_convert_loc (loc
, itype
, arg10
);
11658 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
, tem
);
11659 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg00
);
11660 return fold_build2_loc (loc
, code
, type
, tem
,
11661 build_zero_cst (itype
));
11663 if (operand_equal_p (arg00
, arg10
, 0))
11665 tem
= fold_convert_loc (loc
, itype
, arg11
);
11666 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
, tem
);
11667 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg00
);
11668 return fold_build2_loc (loc
, code
, type
, tem
,
11669 build_zero_cst (itype
));
11673 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11674 && TREE_CODE (arg1
) == BIT_XOR_EXPR
)
11676 tree arg00
= TREE_OPERAND (arg0
, 0);
11677 tree arg01
= TREE_OPERAND (arg0
, 1);
11678 tree arg10
= TREE_OPERAND (arg1
, 0);
11679 tree arg11
= TREE_OPERAND (arg1
, 1);
11680 tree itype
= TREE_TYPE (arg0
);
11682 /* Optimize (X ^ Z) op (Y ^ Z) as X op Y, and symmetries.
11683 operand_equal_p guarantees no side-effects so we don't need
11684 to use omit_one_operand on Z. */
11685 if (operand_equal_p (arg01
, arg11
, 0))
11686 return fold_build2_loc (loc
, code
, type
, arg00
,
11687 fold_convert_loc (loc
, TREE_TYPE (arg00
),
11689 if (operand_equal_p (arg01
, arg10
, 0))
11690 return fold_build2_loc (loc
, code
, type
, arg00
,
11691 fold_convert_loc (loc
, TREE_TYPE (arg00
),
11693 if (operand_equal_p (arg00
, arg11
, 0))
11694 return fold_build2_loc (loc
, code
, type
, arg01
,
11695 fold_convert_loc (loc
, TREE_TYPE (arg01
),
11697 if (operand_equal_p (arg00
, arg10
, 0))
11698 return fold_build2_loc (loc
, code
, type
, arg01
,
11699 fold_convert_loc (loc
, TREE_TYPE (arg01
),
11702 /* Optimize (X ^ C1) op (Y ^ C2) as (X ^ (C1 ^ C2)) op Y. */
11703 if (TREE_CODE (arg01
) == INTEGER_CST
11704 && TREE_CODE (arg11
) == INTEGER_CST
)
11706 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
,
11707 fold_convert_loc (loc
, itype
, arg11
));
11708 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
11709 return fold_build2_loc (loc
, code
, type
, tem
,
11710 fold_convert_loc (loc
, itype
, arg10
));
11714 /* Attempt to simplify equality/inequality comparisons of complex
11715 values. Only lower the comparison if the result is known or
11716 can be simplified to a single scalar comparison. */
11717 if ((TREE_CODE (arg0
) == COMPLEX_EXPR
11718 || TREE_CODE (arg0
) == COMPLEX_CST
)
11719 && (TREE_CODE (arg1
) == COMPLEX_EXPR
11720 || TREE_CODE (arg1
) == COMPLEX_CST
))
11722 tree real0
, imag0
, real1
, imag1
;
11725 if (TREE_CODE (arg0
) == COMPLEX_EXPR
)
11727 real0
= TREE_OPERAND (arg0
, 0);
11728 imag0
= TREE_OPERAND (arg0
, 1);
11732 real0
= TREE_REALPART (arg0
);
11733 imag0
= TREE_IMAGPART (arg0
);
11736 if (TREE_CODE (arg1
) == COMPLEX_EXPR
)
11738 real1
= TREE_OPERAND (arg1
, 0);
11739 imag1
= TREE_OPERAND (arg1
, 1);
11743 real1
= TREE_REALPART (arg1
);
11744 imag1
= TREE_IMAGPART (arg1
);
11747 rcond
= fold_binary_loc (loc
, code
, type
, real0
, real1
);
11748 if (rcond
&& TREE_CODE (rcond
) == INTEGER_CST
)
11750 if (integer_zerop (rcond
))
11752 if (code
== EQ_EXPR
)
11753 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
11755 return fold_build2_loc (loc
, NE_EXPR
, type
, imag0
, imag1
);
11759 if (code
== NE_EXPR
)
11760 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
11762 return fold_build2_loc (loc
, EQ_EXPR
, type
, imag0
, imag1
);
11766 icond
= fold_binary_loc (loc
, code
, type
, imag0
, imag1
);
11767 if (icond
&& TREE_CODE (icond
) == INTEGER_CST
)
11769 if (integer_zerop (icond
))
11771 if (code
== EQ_EXPR
)
11772 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
11774 return fold_build2_loc (loc
, NE_EXPR
, type
, real0
, real1
);
11778 if (code
== NE_EXPR
)
11779 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
11781 return fold_build2_loc (loc
, EQ_EXPR
, type
, real0
, real1
);
11792 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
11793 if (tem
!= NULL_TREE
)
11796 /* Transform comparisons of the form X +- C CMP X. */
11797 if ((TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
11798 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0)
11799 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == REAL_CST
11800 && !HONOR_SNANS (arg0
))
11802 tree arg01
= TREE_OPERAND (arg0
, 1);
11803 enum tree_code code0
= TREE_CODE (arg0
);
11804 int is_positive
= REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg01
)) ? -1 : 1;
11806 /* (X - c) > X becomes false. */
11807 if (code
== GT_EXPR
11808 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
11809 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
11810 return constant_boolean_node (0, type
);
11812 /* Likewise (X + c) < X becomes false. */
11813 if (code
== LT_EXPR
11814 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
11815 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
11816 return constant_boolean_node (0, type
);
11818 /* Convert (X - c) <= X to true. */
11819 if (!HONOR_NANS (arg1
)
11821 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
11822 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
11823 return constant_boolean_node (1, type
);
11825 /* Convert (X + c) >= X to true. */
11826 if (!HONOR_NANS (arg1
)
11828 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
11829 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
11830 return constant_boolean_node (1, type
);
11833 /* If we are comparing an ABS_EXPR with a constant, we can
11834 convert all the cases into explicit comparisons, but they may
11835 well not be faster than doing the ABS and one comparison.
11836 But ABS (X) <= C is a range comparison, which becomes a subtraction
11837 and a comparison, and is probably faster. */
11838 if (code
== LE_EXPR
11839 && TREE_CODE (arg1
) == INTEGER_CST
11840 && TREE_CODE (arg0
) == ABS_EXPR
11841 && ! TREE_SIDE_EFFECTS (arg0
)
11842 && (tem
= negate_expr (arg1
)) != 0
11843 && TREE_CODE (tem
) == INTEGER_CST
11844 && !TREE_OVERFLOW (tem
))
11845 return fold_build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
11846 build2 (GE_EXPR
, type
,
11847 TREE_OPERAND (arg0
, 0), tem
),
11848 build2 (LE_EXPR
, type
,
11849 TREE_OPERAND (arg0
, 0), arg1
));
11851 /* Convert ABS_EXPR<x> >= 0 to true. */
11852 strict_overflow_p
= false;
11853 if (code
== GE_EXPR
11854 && (integer_zerop (arg1
)
11855 || (! HONOR_NANS (arg0
)
11856 && real_zerop (arg1
)))
11857 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
11859 if (strict_overflow_p
)
11860 fold_overflow_warning (("assuming signed overflow does not occur "
11861 "when simplifying comparison of "
11862 "absolute value and zero"),
11863 WARN_STRICT_OVERFLOW_CONDITIONAL
);
11864 return omit_one_operand_loc (loc
, type
,
11865 constant_boolean_node (true, type
),
11869 /* Convert ABS_EXPR<x> < 0 to false. */
11870 strict_overflow_p
= false;
11871 if (code
== LT_EXPR
11872 && (integer_zerop (arg1
) || real_zerop (arg1
))
11873 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
11875 if (strict_overflow_p
)
11876 fold_overflow_warning (("assuming signed overflow does not occur "
11877 "when simplifying comparison of "
11878 "absolute value and zero"),
11879 WARN_STRICT_OVERFLOW_CONDITIONAL
);
11880 return omit_one_operand_loc (loc
, type
,
11881 constant_boolean_node (false, type
),
11885 /* If X is unsigned, convert X < (1 << Y) into X >> Y == 0
11886 and similarly for >= into !=. */
11887 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
11888 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
11889 && TREE_CODE (arg1
) == LSHIFT_EXPR
11890 && integer_onep (TREE_OPERAND (arg1
, 0)))
11891 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
11892 build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
11893 TREE_OPERAND (arg1
, 1)),
11894 build_zero_cst (TREE_TYPE (arg0
)));
11896 /* Similarly for X < (cast) (1 << Y). But cast can't be narrowing,
11897 otherwise Y might be >= # of bits in X's type and thus e.g.
11898 (unsigned char) (1 << Y) for Y 15 might be 0.
11899 If the cast is widening, then 1 << Y should have unsigned type,
11900 otherwise if Y is number of bits in the signed shift type minus 1,
11901 we can't optimize this. E.g. (unsigned long long) (1 << Y) for Y
11902 31 might be 0xffffffff80000000. */
11903 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
11904 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
11905 && CONVERT_EXPR_P (arg1
)
11906 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == LSHIFT_EXPR
11907 && (element_precision (TREE_TYPE (arg1
))
11908 >= element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0))))
11909 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
11910 || (element_precision (TREE_TYPE (arg1
))
11911 == element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0)))))
11912 && integer_onep (TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0)))
11914 tem
= build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
11915 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1));
11916 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
11917 fold_convert_loc (loc
, TREE_TYPE (arg0
), tem
),
11918 build_zero_cst (TREE_TYPE (arg0
)));
11923 case UNORDERED_EXPR
:
11931 /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
11933 tree targ0
= strip_float_extensions (arg0
);
11934 tree targ1
= strip_float_extensions (arg1
);
11935 tree newtype
= TREE_TYPE (targ0
);
11937 if (TYPE_PRECISION (TREE_TYPE (targ1
)) > TYPE_PRECISION (newtype
))
11938 newtype
= TREE_TYPE (targ1
);
11940 if (TYPE_PRECISION (newtype
) < TYPE_PRECISION (TREE_TYPE (arg0
)))
11941 return fold_build2_loc (loc
, code
, type
,
11942 fold_convert_loc (loc
, newtype
, targ0
),
11943 fold_convert_loc (loc
, newtype
, targ1
));
11948 case COMPOUND_EXPR
:
11949 /* When pedantic, a compound expression can be neither an lvalue
11950 nor an integer constant expression. */
11951 if (TREE_SIDE_EFFECTS (arg0
) || TREE_CONSTANT (arg1
))
11953 /* Don't let (0, 0) be null pointer constant. */
11954 tem
= integer_zerop (arg1
) ? build1 (NOP_EXPR
, type
, arg1
)
11955 : fold_convert_loc (loc
, type
, arg1
);
11956 return pedantic_non_lvalue_loc (loc
, tem
);
11959 /* An ASSERT_EXPR should never be passed to fold_binary. */
11960 gcc_unreachable ();
11964 } /* switch (code) */
11967 /* For constants M and N, if M == (1LL << cst) - 1 && (N & M) == M,
11968 ((A & N) + B) & M -> (A + B) & M
11969 Similarly if (N & M) == 0,
11970 ((A | N) + B) & M -> (A + B) & M
11971 and for - instead of + (or unary - instead of +)
11972 and/or ^ instead of |.
11973 If B is constant and (B & M) == 0, fold into A & M.
11975 This function is a helper for match.pd patterns. Return non-NULL
11976 type in which the simplified operation should be performed only
11977 if any optimization is possible.
11979 ARG1 is M above, ARG00 is left operand of +/-, if CODE00 is BIT_*_EXPR,
11980 then ARG00{0,1} are operands of that bitop, otherwise CODE00 is ERROR_MARK.
11981 Similarly for ARG01, CODE01 and ARG01{0,1}, just for the right operand of
11984 fold_bit_and_mask (tree type
, tree arg1
, enum tree_code code
,
11985 tree arg00
, enum tree_code code00
, tree arg000
, tree arg001
,
11986 tree arg01
, enum tree_code code01
, tree arg010
, tree arg011
,
11989 gcc_assert (TREE_CODE (arg1
) == INTEGER_CST
);
11990 gcc_assert (code
== PLUS_EXPR
|| code
== MINUS_EXPR
|| code
== NEGATE_EXPR
);
11991 wi::tree_to_wide_ref cst1
= wi::to_wide (arg1
);
11993 || (cst1
& (cst1
+ 1)) != 0
11994 || !INTEGRAL_TYPE_P (type
)
11995 || (!TYPE_OVERFLOW_WRAPS (type
)
11996 && TREE_CODE (type
) != INTEGER_TYPE
)
11997 || (wi::max_value (type
) & cst1
) != cst1
)
12000 enum tree_code codes
[2] = { code00
, code01
};
12001 tree arg0xx
[4] = { arg000
, arg001
, arg010
, arg011
};
12005 /* Now we know that arg0 is (C + D) or (C - D) or -C and
12006 arg1 (M) is == (1LL << cst) - 1.
12007 Store C into PMOP[0] and D into PMOP[1]. */
12010 which
= code
!= NEGATE_EXPR
;
12012 for (; which
>= 0; which
--)
12013 switch (codes
[which
])
12018 gcc_assert (TREE_CODE (arg0xx
[2 * which
+ 1]) == INTEGER_CST
);
12019 cst0
= wi::to_wide (arg0xx
[2 * which
+ 1]) & cst1
;
12020 if (codes
[which
] == BIT_AND_EXPR
)
12025 else if (cst0
!= 0)
12027 /* If C or D is of the form (A & N) where
12028 (N & M) == M, or of the form (A | N) or
12029 (A ^ N) where (N & M) == 0, replace it with A. */
12030 pmop
[which
] = arg0xx
[2 * which
];
12033 if (TREE_CODE (pmop
[which
]) != INTEGER_CST
)
12035 /* If C or D is a N where (N & M) == 0, it can be
12036 omitted (replaced with 0). */
12037 if ((code
== PLUS_EXPR
12038 || (code
== MINUS_EXPR
&& which
== 0))
12039 && (cst1
& wi::to_wide (pmop
[which
])) == 0)
12040 pmop
[which
] = build_int_cst (type
, 0);
12041 /* Similarly, with C - N where (-N & M) == 0. */
12042 if (code
== MINUS_EXPR
12044 && (cst1
& -wi::to_wide (pmop
[which
])) == 0)
12045 pmop
[which
] = build_int_cst (type
, 0);
12048 gcc_unreachable ();
12051 /* Only build anything new if we optimized one or both arguments above. */
12052 if (pmop
[0] == arg00
&& pmop
[1] == arg01
)
12055 if (TYPE_OVERFLOW_WRAPS (type
))
12058 return unsigned_type_for (type
);
12061 /* Used by contains_label_[p1]. */
12063 struct contains_label_data
12065 hash_set
<tree
> *pset
;
12066 bool inside_switch_p
;
12069 /* Callback for walk_tree, looking for LABEL_EXPR. Return *TP if it is
12070 a LABEL_EXPR or CASE_LABEL_EXPR not inside of another SWITCH_EXPR; otherwise
12071 return NULL_TREE. Do not check the subtrees of GOTO_EXPR. */
12074 contains_label_1 (tree
*tp
, int *walk_subtrees
, void *data
)
12076 contains_label_data
*d
= (contains_label_data
*) data
;
12077 switch (TREE_CODE (*tp
))
12082 case CASE_LABEL_EXPR
:
12083 if (!d
->inside_switch_p
)
12088 if (!d
->inside_switch_p
)
12090 if (walk_tree (&SWITCH_COND (*tp
), contains_label_1
, data
, d
->pset
))
12092 d
->inside_switch_p
= true;
12093 if (walk_tree (&SWITCH_BODY (*tp
), contains_label_1
, data
, d
->pset
))
12095 d
->inside_switch_p
= false;
12096 *walk_subtrees
= 0;
12101 *walk_subtrees
= 0;
12109 /* Return whether the sub-tree ST contains a label which is accessible from
12110 outside the sub-tree. */
12113 contains_label_p (tree st
)
12115 hash_set
<tree
> pset
;
12116 contains_label_data data
= { &pset
, false };
12117 return walk_tree (&st
, contains_label_1
, &data
, &pset
) != NULL_TREE
;
12120 /* Fold a ternary expression of code CODE and type TYPE with operands
12121 OP0, OP1, and OP2. Return the folded expression if folding is
12122 successful. Otherwise, return NULL_TREE. */
12125 fold_ternary_loc (location_t loc
, enum tree_code code
, tree type
,
12126 tree op0
, tree op1
, tree op2
)
12129 tree arg0
= NULL_TREE
, arg1
= NULL_TREE
, arg2
= NULL_TREE
;
12130 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
12132 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
12133 && TREE_CODE_LENGTH (code
) == 3);
12135 /* If this is a commutative operation, and OP0 is a constant, move it
12136 to OP1 to reduce the number of tests below. */
12137 if (commutative_ternary_tree_code (code
)
12138 && tree_swap_operands_p (op0
, op1
))
12139 return fold_build3_loc (loc
, code
, type
, op1
, op0
, op2
);
12141 tem
= generic_simplify (loc
, code
, type
, op0
, op1
, op2
);
12145 /* Strip any conversions that don't change the mode. This is safe
12146 for every expression, except for a comparison expression because
12147 its signedness is derived from its operands. So, in the latter
12148 case, only strip conversions that don't change the signedness.
12150 Note that this is done as an internal manipulation within the
12151 constant folder, in order to find the simplest representation of
12152 the arguments so that their form can be studied. In any cases,
12153 the appropriate type conversions should be put back in the tree
12154 that will get out of the constant folder. */
12175 case COMPONENT_REF
:
12176 if (TREE_CODE (arg0
) == CONSTRUCTOR
12177 && ! type_contains_placeholder_p (TREE_TYPE (arg0
)))
12179 unsigned HOST_WIDE_INT idx
;
12181 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (arg0
), idx
, field
, value
)
12188 case VEC_COND_EXPR
:
12189 /* Pedantic ANSI C says that a conditional expression is never an lvalue,
12190 so all simple results must be passed through pedantic_non_lvalue. */
12191 if (TREE_CODE (arg0
) == INTEGER_CST
)
12193 tree unused_op
= integer_zerop (arg0
) ? op1
: op2
;
12194 tem
= integer_zerop (arg0
) ? op2
: op1
;
12195 /* Only optimize constant conditions when the selected branch
12196 has the same type as the COND_EXPR. This avoids optimizing
12197 away "c ? x : throw", where the throw has a void type.
12198 Avoid throwing away that operand which contains label. */
12199 if ((!TREE_SIDE_EFFECTS (unused_op
)
12200 || !contains_label_p (unused_op
))
12201 && (! VOID_TYPE_P (TREE_TYPE (tem
))
12202 || VOID_TYPE_P (type
)))
12203 return pedantic_non_lvalue_loc (loc
, tem
);
12206 else if (TREE_CODE (arg0
) == VECTOR_CST
)
12208 unsigned HOST_WIDE_INT nelts
;
12209 if ((TREE_CODE (arg1
) == VECTOR_CST
12210 || TREE_CODE (arg1
) == CONSTRUCTOR
)
12211 && (TREE_CODE (arg2
) == VECTOR_CST
12212 || TREE_CODE (arg2
) == CONSTRUCTOR
)
12213 && TYPE_VECTOR_SUBPARTS (type
).is_constant (&nelts
))
12215 vec_perm_builder
sel (nelts
, nelts
, 1);
12216 for (unsigned int i
= 0; i
< nelts
; i
++)
12218 tree val
= VECTOR_CST_ELT (arg0
, i
);
12219 if (integer_all_onesp (val
))
12220 sel
.quick_push (i
);
12221 else if (integer_zerop (val
))
12222 sel
.quick_push (nelts
+ i
);
12223 else /* Currently unreachable. */
12226 vec_perm_indices
indices (sel
, 2, nelts
);
12227 tree t
= fold_vec_perm (type
, arg1
, arg2
, indices
);
12228 if (t
!= NULL_TREE
)
12233 /* If we have A op B ? A : C, we may be able to convert this to a
12234 simpler expression, depending on the operation and the values
12235 of B and C. Signed zeros prevent all of these transformations,
12236 for reasons given above each one.
12238 Also try swapping the arguments and inverting the conditional. */
12239 if (COMPARISON_CLASS_P (arg0
)
12240 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0), op1
)
12241 && !HONOR_SIGNED_ZEROS (element_mode (op1
)))
12243 tem
= fold_cond_expr_with_comparison (loc
, type
, arg0
, op1
, op2
);
12248 if (COMPARISON_CLASS_P (arg0
)
12249 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0), op2
)
12250 && !HONOR_SIGNED_ZEROS (element_mode (op2
)))
12252 location_t loc0
= expr_location_or (arg0
, loc
);
12253 tem
= fold_invert_truthvalue (loc0
, arg0
);
12254 if (tem
&& COMPARISON_CLASS_P (tem
))
12256 tem
= fold_cond_expr_with_comparison (loc
, type
, tem
, op2
, op1
);
12262 /* If the second operand is simpler than the third, swap them
12263 since that produces better jump optimization results. */
12264 if (truth_value_p (TREE_CODE (arg0
))
12265 && tree_swap_operands_p (op1
, op2
))
12267 location_t loc0
= expr_location_or (arg0
, loc
);
12268 /* See if this can be inverted. If it can't, possibly because
12269 it was a floating-point inequality comparison, don't do
12271 tem
= fold_invert_truthvalue (loc0
, arg0
);
12273 return fold_build3_loc (loc
, code
, type
, tem
, op2
, op1
);
12276 /* Convert A ? 1 : 0 to simply A. */
12277 if ((code
== VEC_COND_EXPR
? integer_all_onesp (op1
)
12278 : (integer_onep (op1
)
12279 && !VECTOR_TYPE_P (type
)))
12280 && integer_zerop (op2
)
12281 /* If we try to convert OP0 to our type, the
12282 call to fold will try to move the conversion inside
12283 a COND, which will recurse. In that case, the COND_EXPR
12284 is probably the best choice, so leave it alone. */
12285 && type
== TREE_TYPE (arg0
))
12286 return pedantic_non_lvalue_loc (loc
, arg0
);
12288 /* Convert A ? 0 : 1 to !A. This prefers the use of NOT_EXPR
12289 over COND_EXPR in cases such as floating point comparisons. */
12290 if (integer_zerop (op1
)
12291 && code
== COND_EXPR
12292 && integer_onep (op2
)
12293 && !VECTOR_TYPE_P (type
)
12294 && truth_value_p (TREE_CODE (arg0
)))
12295 return pedantic_non_lvalue_loc (loc
,
12296 fold_convert_loc (loc
, type
,
12297 invert_truthvalue_loc (loc
,
12300 /* A < 0 ? <sign bit of A> : 0 is simply (A & <sign bit of A>). */
12301 if (TREE_CODE (arg0
) == LT_EXPR
12302 && integer_zerop (TREE_OPERAND (arg0
, 1))
12303 && integer_zerop (op2
)
12304 && (tem
= sign_bit_p (TREE_OPERAND (arg0
, 0), arg1
)))
12306 /* sign_bit_p looks through both zero and sign extensions,
12307 but for this optimization only sign extensions are
12309 tree tem2
= TREE_OPERAND (arg0
, 0);
12310 while (tem
!= tem2
)
12312 if (TREE_CODE (tem2
) != NOP_EXPR
12313 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (tem2
, 0))))
12318 tem2
= TREE_OPERAND (tem2
, 0);
12320 /* sign_bit_p only checks ARG1 bits within A's precision.
12321 If <sign bit of A> has wider type than A, bits outside
12322 of A's precision in <sign bit of A> need to be checked.
12323 If they are all 0, this optimization needs to be done
12324 in unsigned A's type, if they are all 1 in signed A's type,
12325 otherwise this can't be done. */
12327 && TYPE_PRECISION (TREE_TYPE (tem
))
12328 < TYPE_PRECISION (TREE_TYPE (arg1
))
12329 && TYPE_PRECISION (TREE_TYPE (tem
))
12330 < TYPE_PRECISION (type
))
12332 int inner_width
, outer_width
;
12335 inner_width
= TYPE_PRECISION (TREE_TYPE (tem
));
12336 outer_width
= TYPE_PRECISION (TREE_TYPE (arg1
));
12337 if (outer_width
> TYPE_PRECISION (type
))
12338 outer_width
= TYPE_PRECISION (type
);
12340 wide_int mask
= wi::shifted_mask
12341 (inner_width
, outer_width
- inner_width
, false,
12342 TYPE_PRECISION (TREE_TYPE (arg1
)));
12344 wide_int common
= mask
& wi::to_wide (arg1
);
12345 if (common
== mask
)
12347 tem_type
= signed_type_for (TREE_TYPE (tem
));
12348 tem
= fold_convert_loc (loc
, tem_type
, tem
);
12350 else if (common
== 0)
12352 tem_type
= unsigned_type_for (TREE_TYPE (tem
));
12353 tem
= fold_convert_loc (loc
, tem_type
, tem
);
12361 fold_convert_loc (loc
, type
,
12362 fold_build2_loc (loc
, BIT_AND_EXPR
,
12363 TREE_TYPE (tem
), tem
,
12364 fold_convert_loc (loc
,
12369 /* (A >> N) & 1 ? (1 << N) : 0 is simply A & (1 << N). A & 1 was
12370 already handled above. */
12371 if (TREE_CODE (arg0
) == BIT_AND_EXPR
12372 && integer_onep (TREE_OPERAND (arg0
, 1))
12373 && integer_zerop (op2
)
12374 && integer_pow2p (arg1
))
12376 tree tem
= TREE_OPERAND (arg0
, 0);
12378 if (TREE_CODE (tem
) == RSHIFT_EXPR
12379 && tree_fits_uhwi_p (TREE_OPERAND (tem
, 1))
12380 && (unsigned HOST_WIDE_INT
) tree_log2 (arg1
)
12381 == tree_to_uhwi (TREE_OPERAND (tem
, 1)))
12382 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
12383 fold_convert_loc (loc
, type
,
12384 TREE_OPERAND (tem
, 0)),
12388 /* A & N ? N : 0 is simply A & N if N is a power of two. This
12389 is probably obsolete because the first operand should be a
12390 truth value (that's why we have the two cases above), but let's
12391 leave it in until we can confirm this for all front-ends. */
12392 if (integer_zerop (op2
)
12393 && TREE_CODE (arg0
) == NE_EXPR
12394 && integer_zerop (TREE_OPERAND (arg0
, 1))
12395 && integer_pow2p (arg1
)
12396 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
12397 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
12398 arg1
, OEP_ONLY_CONST
)
12399 /* operand_equal_p compares just value, not precision, so e.g.
12400 arg1 could be 8-bit -128 and be power of two, but BIT_AND_EXPR
12401 second operand 32-bit -128, which is not a power of two (or vice
12403 && integer_pow2p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1)))
12404 return pedantic_non_lvalue_loc (loc
,
12405 fold_convert_loc (loc
, type
,
12406 TREE_OPERAND (arg0
,
12409 /* Disable the transformations below for vectors, since
12410 fold_binary_op_with_conditional_arg may undo them immediately,
12411 yielding an infinite loop. */
12412 if (code
== VEC_COND_EXPR
)
12415 /* Convert A ? B : 0 into A && B if A and B are truth values. */
12416 if (integer_zerop (op2
)
12417 && truth_value_p (TREE_CODE (arg0
))
12418 && truth_value_p (TREE_CODE (arg1
))
12419 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12420 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
? BIT_AND_EXPR
12421 : TRUTH_ANDIF_EXPR
,
12422 type
, fold_convert_loc (loc
, type
, arg0
), op1
);
12424 /* Convert A ? B : 1 into !A || B if A and B are truth values. */
12425 if (code
== VEC_COND_EXPR
? integer_all_onesp (op2
) : integer_onep (op2
)
12426 && truth_value_p (TREE_CODE (arg0
))
12427 && truth_value_p (TREE_CODE (arg1
))
12428 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12430 location_t loc0
= expr_location_or (arg0
, loc
);
12431 /* Only perform transformation if ARG0 is easily inverted. */
12432 tem
= fold_invert_truthvalue (loc0
, arg0
);
12434 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12437 type
, fold_convert_loc (loc
, type
, tem
),
12441 /* Convert A ? 0 : B into !A && B if A and B are truth values. */
12442 if (integer_zerop (arg1
)
12443 && truth_value_p (TREE_CODE (arg0
))
12444 && truth_value_p (TREE_CODE (op2
))
12445 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12447 location_t loc0
= expr_location_or (arg0
, loc
);
12448 /* Only perform transformation if ARG0 is easily inverted. */
12449 tem
= fold_invert_truthvalue (loc0
, arg0
);
12451 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12452 ? BIT_AND_EXPR
: TRUTH_ANDIF_EXPR
,
12453 type
, fold_convert_loc (loc
, type
, tem
),
12457 /* Convert A ? 1 : B into A || B if A and B are truth values. */
12458 if (code
== VEC_COND_EXPR
? integer_all_onesp (arg1
) : integer_onep (arg1
)
12459 && truth_value_p (TREE_CODE (arg0
))
12460 && truth_value_p (TREE_CODE (op2
))
12461 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12462 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12463 ? BIT_IOR_EXPR
: TRUTH_ORIF_EXPR
,
12464 type
, fold_convert_loc (loc
, type
, arg0
), op2
);
12469 /* CALL_EXPRs used to be ternary exprs. Catch any mistaken uses
12470 of fold_ternary on them. */
12471 gcc_unreachable ();
12473 case BIT_FIELD_REF
:
12474 if (TREE_CODE (arg0
) == VECTOR_CST
12475 && (type
== TREE_TYPE (TREE_TYPE (arg0
))
12476 || (VECTOR_TYPE_P (type
)
12477 && TREE_TYPE (type
) == TREE_TYPE (TREE_TYPE (arg0
))))
12478 && tree_fits_uhwi_p (op1
)
12479 && tree_fits_uhwi_p (op2
))
12481 tree eltype
= TREE_TYPE (TREE_TYPE (arg0
));
12482 unsigned HOST_WIDE_INT width
= tree_to_uhwi (TYPE_SIZE (eltype
));
12483 unsigned HOST_WIDE_INT n
= tree_to_uhwi (arg1
);
12484 unsigned HOST_WIDE_INT idx
= tree_to_uhwi (op2
);
12487 && (idx
% width
) == 0
12488 && (n
% width
) == 0
12489 && known_le ((idx
+ n
) / width
,
12490 TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
))))
12495 if (TREE_CODE (arg0
) == VECTOR_CST
)
12499 tem
= VECTOR_CST_ELT (arg0
, idx
);
12500 if (VECTOR_TYPE_P (type
))
12501 tem
= fold_build1 (VIEW_CONVERT_EXPR
, type
, tem
);
12505 tree_vector_builder
vals (type
, n
, 1);
12506 for (unsigned i
= 0; i
< n
; ++i
)
12507 vals
.quick_push (VECTOR_CST_ELT (arg0
, idx
+ i
));
12508 return vals
.build ();
12513 /* On constants we can use native encode/interpret to constant
12514 fold (nearly) all BIT_FIELD_REFs. */
12515 if (CONSTANT_CLASS_P (arg0
)
12516 && can_native_interpret_type_p (type
)
12517 && BITS_PER_UNIT
== 8
12518 && tree_fits_uhwi_p (op1
)
12519 && tree_fits_uhwi_p (op2
))
12521 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
12522 unsigned HOST_WIDE_INT bitsize
= tree_to_uhwi (op1
);
12523 /* Limit us to a reasonable amount of work. To relax the
12524 other limitations we need bit-shifting of the buffer
12525 and rounding up the size. */
12526 if (bitpos
% BITS_PER_UNIT
== 0
12527 && bitsize
% BITS_PER_UNIT
== 0
12528 && bitsize
<= MAX_BITSIZE_MODE_ANY_MODE
)
12530 unsigned char b
[MAX_BITSIZE_MODE_ANY_MODE
/ BITS_PER_UNIT
];
12531 unsigned HOST_WIDE_INT len
12532 = native_encode_expr (arg0
, b
, bitsize
/ BITS_PER_UNIT
,
12533 bitpos
/ BITS_PER_UNIT
);
12535 && len
* BITS_PER_UNIT
>= bitsize
)
12537 tree v
= native_interpret_expr (type
, b
,
12538 bitsize
/ BITS_PER_UNIT
);
12547 case VEC_PERM_EXPR
:
12548 /* Perform constant folding of BIT_INSERT_EXPR. */
12549 if (TREE_CODE (arg2
) == VECTOR_CST
12550 && TREE_CODE (op0
) == VECTOR_CST
12551 && TREE_CODE (op1
) == VECTOR_CST
)
12553 /* Build a vector of integers from the tree mask. */
12554 vec_perm_builder builder
;
12555 if (!tree_to_vec_perm_builder (&builder
, arg2
))
12558 /* Create a vec_perm_indices for the integer vector. */
12559 poly_uint64 nelts
= TYPE_VECTOR_SUBPARTS (type
);
12560 bool single_arg
= (op0
== op1
);
12561 vec_perm_indices
sel (builder
, single_arg
? 1 : 2, nelts
);
12562 return fold_vec_perm (type
, op0
, op1
, sel
);
12566 case BIT_INSERT_EXPR
:
12567 /* Perform (partial) constant folding of BIT_INSERT_EXPR. */
12568 if (TREE_CODE (arg0
) == INTEGER_CST
12569 && TREE_CODE (arg1
) == INTEGER_CST
)
12571 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
12572 unsigned bitsize
= TYPE_PRECISION (TREE_TYPE (arg1
));
12573 wide_int tem
= (wi::to_wide (arg0
)
12574 & wi::shifted_mask (bitpos
, bitsize
, true,
12575 TYPE_PRECISION (type
)));
12577 = wi::lshift (wi::zext (wi::to_wide (arg1
, TYPE_PRECISION (type
)),
12579 return wide_int_to_tree (type
, wi::bit_or (tem
, tem2
));
12581 else if (TREE_CODE (arg0
) == VECTOR_CST
12582 && CONSTANT_CLASS_P (arg1
)
12583 && types_compatible_p (TREE_TYPE (TREE_TYPE (arg0
)),
12586 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
12587 unsigned HOST_WIDE_INT elsize
12588 = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (arg1
)));
12589 if (bitpos
% elsize
== 0)
12591 unsigned k
= bitpos
/ elsize
;
12592 unsigned HOST_WIDE_INT nelts
;
12593 if (operand_equal_p (VECTOR_CST_ELT (arg0
, k
), arg1
, 0))
12595 else if (VECTOR_CST_NELTS (arg0
).is_constant (&nelts
))
12597 tree_vector_builder
elts (type
, nelts
, 1);
12598 elts
.quick_grow (nelts
);
12599 for (unsigned HOST_WIDE_INT i
= 0; i
< nelts
; ++i
)
12600 elts
[i
] = (i
== k
? arg1
: VECTOR_CST_ELT (arg0
, i
));
12601 return elts
.build ();
12609 } /* switch (code) */
12612 /* Gets the element ACCESS_INDEX from CTOR, which must be a CONSTRUCTOR
12613 of an array (or vector). *CTOR_IDX if non-NULL is updated with the
12614 constructor element index of the value returned. If the element is
12615 not found NULL_TREE is returned and *CTOR_IDX is updated to
12616 the index of the element after the ACCESS_INDEX position (which
12617 may be outside of the CTOR array). */
12620 get_array_ctor_element_at_index (tree ctor
, offset_int access_index
,
12621 unsigned *ctor_idx
)
12623 tree index_type
= NULL_TREE
;
12624 signop index_sgn
= UNSIGNED
;
12625 offset_int low_bound
= 0;
12627 if (TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
)
12629 tree domain_type
= TYPE_DOMAIN (TREE_TYPE (ctor
));
12630 if (domain_type
&& TYPE_MIN_VALUE (domain_type
))
12632 /* Static constructors for variably sized objects makes no sense. */
12633 gcc_assert (TREE_CODE (TYPE_MIN_VALUE (domain_type
)) == INTEGER_CST
);
12634 index_type
= TREE_TYPE (TYPE_MIN_VALUE (domain_type
));
12635 /* ??? When it is obvious that the range is signed, treat it so. */
12636 if (TYPE_UNSIGNED (index_type
)
12637 && TYPE_MAX_VALUE (domain_type
)
12638 && tree_int_cst_lt (TYPE_MAX_VALUE (domain_type
),
12639 TYPE_MIN_VALUE (domain_type
)))
12641 index_sgn
= SIGNED
;
12643 = offset_int::from (wi::to_wide (TYPE_MIN_VALUE (domain_type
)),
12648 index_sgn
= TYPE_SIGN (index_type
);
12649 low_bound
= wi::to_offset (TYPE_MIN_VALUE (domain_type
));
12655 access_index
= wi::ext (access_index
, TYPE_PRECISION (index_type
),
12658 offset_int index
= low_bound
;
12660 index
= wi::ext (index
, TYPE_PRECISION (index_type
), index_sgn
);
12662 offset_int max_index
= index
;
12665 bool first_p
= true;
12667 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor
), cnt
, cfield
, cval
)
12669 /* Array constructor might explicitly set index, or specify a range,
12670 or leave index NULL meaning that it is next index after previous
12674 if (TREE_CODE (cfield
) == INTEGER_CST
)
12676 = offset_int::from (wi::to_wide (cfield
), index_sgn
);
12679 gcc_assert (TREE_CODE (cfield
) == RANGE_EXPR
);
12680 index
= offset_int::from (wi::to_wide (TREE_OPERAND (cfield
, 0)),
12683 = offset_int::from (wi::to_wide (TREE_OPERAND (cfield
, 1)),
12685 gcc_checking_assert (wi::le_p (index
, max_index
, index_sgn
));
12690 index
= max_index
+ 1;
12692 index
= wi::ext (index
, TYPE_PRECISION (index_type
), index_sgn
);
12693 gcc_checking_assert (wi::gt_p (index
, max_index
, index_sgn
));
12699 /* Do we have match? */
12700 if (wi::cmp (access_index
, index
, index_sgn
) >= 0)
12702 if (wi::cmp (access_index
, max_index
, index_sgn
) <= 0)
12709 else if (in_gimple_form
)
12710 /* We're past the element we search for. Note during parsing
12711 the elements might not be sorted.
12712 ??? We should use a binary search and a flag on the
12713 CONSTRUCTOR as to whether elements are sorted in declaration
12722 /* Perform constant folding and related simplification of EXPR.
12723 The related simplifications include x*1 => x, x*0 => 0, etc.,
12724 and application of the associative law.
12725 NOP_EXPR conversions may be removed freely (as long as we
12726 are careful not to change the type of the overall expression).
12727 We cannot simplify through a CONVERT_EXPR, FIX_EXPR or FLOAT_EXPR,
12728 but we can constant-fold them if they have constant operands. */
12730 #ifdef ENABLE_FOLD_CHECKING
12731 # define fold(x) fold_1 (x)
12732 static tree
fold_1 (tree
);
12738 const tree t
= expr
;
12739 enum tree_code code
= TREE_CODE (t
);
12740 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
12742 location_t loc
= EXPR_LOCATION (expr
);
12744 /* Return right away if a constant. */
12745 if (kind
== tcc_constant
)
12748 /* CALL_EXPR-like objects with variable numbers of operands are
12749 treated specially. */
12750 if (kind
== tcc_vl_exp
)
12752 if (code
== CALL_EXPR
)
12754 tem
= fold_call_expr (loc
, expr
, false);
12755 return tem
? tem
: expr
;
12760 if (IS_EXPR_CODE_CLASS (kind
))
12762 tree type
= TREE_TYPE (t
);
12763 tree op0
, op1
, op2
;
12765 switch (TREE_CODE_LENGTH (code
))
12768 op0
= TREE_OPERAND (t
, 0);
12769 tem
= fold_unary_loc (loc
, code
, type
, op0
);
12770 return tem
? tem
: expr
;
12772 op0
= TREE_OPERAND (t
, 0);
12773 op1
= TREE_OPERAND (t
, 1);
12774 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
12775 return tem
? tem
: expr
;
12777 op0
= TREE_OPERAND (t
, 0);
12778 op1
= TREE_OPERAND (t
, 1);
12779 op2
= TREE_OPERAND (t
, 2);
12780 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
12781 return tem
? tem
: expr
;
12791 tree op0
= TREE_OPERAND (t
, 0);
12792 tree op1
= TREE_OPERAND (t
, 1);
12794 if (TREE_CODE (op1
) == INTEGER_CST
12795 && TREE_CODE (op0
) == CONSTRUCTOR
12796 && ! type_contains_placeholder_p (TREE_TYPE (op0
)))
12798 tree val
= get_array_ctor_element_at_index (op0
,
12799 wi::to_offset (op1
));
12807 /* Return a VECTOR_CST if possible. */
12810 tree type
= TREE_TYPE (t
);
12811 if (TREE_CODE (type
) != VECTOR_TYPE
)
12816 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (t
), i
, val
)
12817 if (! CONSTANT_CLASS_P (val
))
12820 return build_vector_from_ctor (type
, CONSTRUCTOR_ELTS (t
));
12824 return fold (DECL_INITIAL (t
));
12828 } /* switch (code) */
12831 #ifdef ENABLE_FOLD_CHECKING
12834 static void fold_checksum_tree (const_tree
, struct md5_ctx
*,
12835 hash_table
<nofree_ptr_hash
<const tree_node
> > *);
12836 static void fold_check_failed (const_tree
, const_tree
);
12837 void print_fold_checksum (const_tree
);
12839 /* When --enable-checking=fold, compute a digest of expr before
12840 and after actual fold call to see if fold did not accidentally
12841 change original expr. */
12847 struct md5_ctx ctx
;
12848 unsigned char checksum_before
[16], checksum_after
[16];
12849 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12851 md5_init_ctx (&ctx
);
12852 fold_checksum_tree (expr
, &ctx
, &ht
);
12853 md5_finish_ctx (&ctx
, checksum_before
);
12856 ret
= fold_1 (expr
);
12858 md5_init_ctx (&ctx
);
12859 fold_checksum_tree (expr
, &ctx
, &ht
);
12860 md5_finish_ctx (&ctx
, checksum_after
);
12862 if (memcmp (checksum_before
, checksum_after
, 16))
12863 fold_check_failed (expr
, ret
);
12869 print_fold_checksum (const_tree expr
)
12871 struct md5_ctx ctx
;
12872 unsigned char checksum
[16], cnt
;
12873 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12875 md5_init_ctx (&ctx
);
12876 fold_checksum_tree (expr
, &ctx
, &ht
);
12877 md5_finish_ctx (&ctx
, checksum
);
12878 for (cnt
= 0; cnt
< 16; ++cnt
)
12879 fprintf (stderr
, "%02x", checksum
[cnt
]);
12880 putc ('\n', stderr
);
12884 fold_check_failed (const_tree expr ATTRIBUTE_UNUSED
, const_tree ret ATTRIBUTE_UNUSED
)
12886 internal_error ("fold check: original tree changed by fold");
12890 fold_checksum_tree (const_tree expr
, struct md5_ctx
*ctx
,
12891 hash_table
<nofree_ptr_hash
<const tree_node
> > *ht
)
12893 const tree_node
**slot
;
12894 enum tree_code code
;
12895 union tree_node
*buf
;
12901 slot
= ht
->find_slot (expr
, INSERT
);
12905 code
= TREE_CODE (expr
);
12906 if (TREE_CODE_CLASS (code
) == tcc_declaration
12907 && HAS_DECL_ASSEMBLER_NAME_P (expr
))
12909 /* Allow DECL_ASSEMBLER_NAME and symtab_node to be modified. */
12910 size_t sz
= tree_size (expr
);
12911 buf
= XALLOCAVAR (union tree_node
, sz
);
12912 memcpy ((char *) buf
, expr
, sz
);
12913 SET_DECL_ASSEMBLER_NAME ((tree
) buf
, NULL
);
12914 buf
->decl_with_vis
.symtab_node
= NULL
;
12915 buf
->base
.nowarning_flag
= 0;
12918 else if (TREE_CODE_CLASS (code
) == tcc_type
12919 && (TYPE_POINTER_TO (expr
)
12920 || TYPE_REFERENCE_TO (expr
)
12921 || TYPE_CACHED_VALUES_P (expr
)
12922 || TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr
)
12923 || TYPE_NEXT_VARIANT (expr
)
12924 || TYPE_ALIAS_SET_KNOWN_P (expr
)))
12926 /* Allow these fields to be modified. */
12928 size_t sz
= tree_size (expr
);
12929 buf
= XALLOCAVAR (union tree_node
, sz
);
12930 memcpy ((char *) buf
, expr
, sz
);
12931 expr
= tmp
= (tree
) buf
;
12932 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (tmp
) = 0;
12933 TYPE_POINTER_TO (tmp
) = NULL
;
12934 TYPE_REFERENCE_TO (tmp
) = NULL
;
12935 TYPE_NEXT_VARIANT (tmp
) = NULL
;
12936 TYPE_ALIAS_SET (tmp
) = -1;
12937 if (TYPE_CACHED_VALUES_P (tmp
))
12939 TYPE_CACHED_VALUES_P (tmp
) = 0;
12940 TYPE_CACHED_VALUES (tmp
) = NULL
;
12943 else if (TREE_NO_WARNING (expr
) && (DECL_P (expr
) || EXPR_P (expr
)))
12945 /* Allow TREE_NO_WARNING to be set. Perhaps we shouldn't allow that
12946 and change builtins.c etc. instead - see PR89543. */
12947 size_t sz
= tree_size (expr
);
12948 buf
= XALLOCAVAR (union tree_node
, sz
);
12949 memcpy ((char *) buf
, expr
, sz
);
12950 buf
->base
.nowarning_flag
= 0;
12953 md5_process_bytes (expr
, tree_size (expr
), ctx
);
12954 if (CODE_CONTAINS_STRUCT (code
, TS_TYPED
))
12955 fold_checksum_tree (TREE_TYPE (expr
), ctx
, ht
);
12956 if (TREE_CODE_CLASS (code
) != tcc_type
12957 && TREE_CODE_CLASS (code
) != tcc_declaration
12958 && code
!= TREE_LIST
12959 && code
!= SSA_NAME
12960 && CODE_CONTAINS_STRUCT (code
, TS_COMMON
))
12961 fold_checksum_tree (TREE_CHAIN (expr
), ctx
, ht
);
12962 switch (TREE_CODE_CLASS (code
))
12968 md5_process_bytes (TREE_STRING_POINTER (expr
),
12969 TREE_STRING_LENGTH (expr
), ctx
);
12972 fold_checksum_tree (TREE_REALPART (expr
), ctx
, ht
);
12973 fold_checksum_tree (TREE_IMAGPART (expr
), ctx
, ht
);
12976 len
= vector_cst_encoded_nelts (expr
);
12977 for (i
= 0; i
< len
; ++i
)
12978 fold_checksum_tree (VECTOR_CST_ENCODED_ELT (expr
, i
), ctx
, ht
);
12984 case tcc_exceptional
:
12988 fold_checksum_tree (TREE_PURPOSE (expr
), ctx
, ht
);
12989 fold_checksum_tree (TREE_VALUE (expr
), ctx
, ht
);
12990 expr
= TREE_CHAIN (expr
);
12991 goto recursive_label
;
12994 for (i
= 0; i
< TREE_VEC_LENGTH (expr
); ++i
)
12995 fold_checksum_tree (TREE_VEC_ELT (expr
, i
), ctx
, ht
);
13001 case tcc_expression
:
13002 case tcc_reference
:
13003 case tcc_comparison
:
13006 case tcc_statement
:
13008 len
= TREE_OPERAND_LENGTH (expr
);
13009 for (i
= 0; i
< len
; ++i
)
13010 fold_checksum_tree (TREE_OPERAND (expr
, i
), ctx
, ht
);
13012 case tcc_declaration
:
13013 fold_checksum_tree (DECL_NAME (expr
), ctx
, ht
);
13014 fold_checksum_tree (DECL_CONTEXT (expr
), ctx
, ht
);
13015 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_COMMON
))
13017 fold_checksum_tree (DECL_SIZE (expr
), ctx
, ht
);
13018 fold_checksum_tree (DECL_SIZE_UNIT (expr
), ctx
, ht
);
13019 fold_checksum_tree (DECL_INITIAL (expr
), ctx
, ht
);
13020 fold_checksum_tree (DECL_ABSTRACT_ORIGIN (expr
), ctx
, ht
);
13021 fold_checksum_tree (DECL_ATTRIBUTES (expr
), ctx
, ht
);
13024 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_NON_COMMON
))
13026 if (TREE_CODE (expr
) == FUNCTION_DECL
)
13028 fold_checksum_tree (DECL_VINDEX (expr
), ctx
, ht
);
13029 fold_checksum_tree (DECL_ARGUMENTS (expr
), ctx
, ht
);
13031 fold_checksum_tree (DECL_RESULT_FLD (expr
), ctx
, ht
);
13035 if (TREE_CODE (expr
) == ENUMERAL_TYPE
)
13036 fold_checksum_tree (TYPE_VALUES (expr
), ctx
, ht
);
13037 fold_checksum_tree (TYPE_SIZE (expr
), ctx
, ht
);
13038 fold_checksum_tree (TYPE_SIZE_UNIT (expr
), ctx
, ht
);
13039 fold_checksum_tree (TYPE_ATTRIBUTES (expr
), ctx
, ht
);
13040 fold_checksum_tree (TYPE_NAME (expr
), ctx
, ht
);
13041 if (INTEGRAL_TYPE_P (expr
)
13042 || SCALAR_FLOAT_TYPE_P (expr
))
13044 fold_checksum_tree (TYPE_MIN_VALUE (expr
), ctx
, ht
);
13045 fold_checksum_tree (TYPE_MAX_VALUE (expr
), ctx
, ht
);
13047 fold_checksum_tree (TYPE_MAIN_VARIANT (expr
), ctx
, ht
);
13048 if (TREE_CODE (expr
) == RECORD_TYPE
13049 || TREE_CODE (expr
) == UNION_TYPE
13050 || TREE_CODE (expr
) == QUAL_UNION_TYPE
)
13051 fold_checksum_tree (TYPE_BINFO (expr
), ctx
, ht
);
13052 fold_checksum_tree (TYPE_CONTEXT (expr
), ctx
, ht
);
13059 /* Helper function for outputting the checksum of a tree T. When
13060 debugging with gdb, you can "define mynext" to be "next" followed
13061 by "call debug_fold_checksum (op0)", then just trace down till the
13064 DEBUG_FUNCTION
void
13065 debug_fold_checksum (const_tree t
)
13068 unsigned char checksum
[16];
13069 struct md5_ctx ctx
;
13070 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13072 md5_init_ctx (&ctx
);
13073 fold_checksum_tree (t
, &ctx
, &ht
);
13074 md5_finish_ctx (&ctx
, checksum
);
13077 for (i
= 0; i
< 16; i
++)
13078 fprintf (stderr
, "%d ", checksum
[i
]);
13080 fprintf (stderr
, "\n");
13085 /* Fold a unary tree expression with code CODE of type TYPE with an
13086 operand OP0. LOC is the location of the resulting expression.
13087 Return a folded expression if successful. Otherwise, return a tree
13088 expression with code CODE of type TYPE with an operand OP0. */
13091 fold_build1_loc (location_t loc
,
13092 enum tree_code code
, tree type
, tree op0 MEM_STAT_DECL
)
13095 #ifdef ENABLE_FOLD_CHECKING
13096 unsigned char checksum_before
[16], checksum_after
[16];
13097 struct md5_ctx ctx
;
13098 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13100 md5_init_ctx (&ctx
);
13101 fold_checksum_tree (op0
, &ctx
, &ht
);
13102 md5_finish_ctx (&ctx
, checksum_before
);
13106 tem
= fold_unary_loc (loc
, code
, type
, op0
);
13108 tem
= build1_loc (loc
, code
, type
, op0 PASS_MEM_STAT
);
13110 #ifdef ENABLE_FOLD_CHECKING
13111 md5_init_ctx (&ctx
);
13112 fold_checksum_tree (op0
, &ctx
, &ht
);
13113 md5_finish_ctx (&ctx
, checksum_after
);
13115 if (memcmp (checksum_before
, checksum_after
, 16))
13116 fold_check_failed (op0
, tem
);
13121 /* Fold a binary tree expression with code CODE of type TYPE with
13122 operands OP0 and OP1. LOC is the location of the resulting
13123 expression. Return a folded expression if successful. Otherwise,
13124 return a tree expression with code CODE of type TYPE with operands
13128 fold_build2_loc (location_t loc
,
13129 enum tree_code code
, tree type
, tree op0
, tree op1
13133 #ifdef ENABLE_FOLD_CHECKING
13134 unsigned char checksum_before_op0
[16],
13135 checksum_before_op1
[16],
13136 checksum_after_op0
[16],
13137 checksum_after_op1
[16];
13138 struct md5_ctx ctx
;
13139 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13141 md5_init_ctx (&ctx
);
13142 fold_checksum_tree (op0
, &ctx
, &ht
);
13143 md5_finish_ctx (&ctx
, checksum_before_op0
);
13146 md5_init_ctx (&ctx
);
13147 fold_checksum_tree (op1
, &ctx
, &ht
);
13148 md5_finish_ctx (&ctx
, checksum_before_op1
);
13152 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
13154 tem
= build2_loc (loc
, code
, type
, op0
, op1 PASS_MEM_STAT
);
13156 #ifdef ENABLE_FOLD_CHECKING
13157 md5_init_ctx (&ctx
);
13158 fold_checksum_tree (op0
, &ctx
, &ht
);
13159 md5_finish_ctx (&ctx
, checksum_after_op0
);
13162 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
13163 fold_check_failed (op0
, tem
);
13165 md5_init_ctx (&ctx
);
13166 fold_checksum_tree (op1
, &ctx
, &ht
);
13167 md5_finish_ctx (&ctx
, checksum_after_op1
);
13169 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
13170 fold_check_failed (op1
, tem
);
13175 /* Fold a ternary tree expression with code CODE of type TYPE with
13176 operands OP0, OP1, and OP2. Return a folded expression if
13177 successful. Otherwise, return a tree expression with code CODE of
13178 type TYPE with operands OP0, OP1, and OP2. */
13181 fold_build3_loc (location_t loc
, enum tree_code code
, tree type
,
13182 tree op0
, tree op1
, tree op2 MEM_STAT_DECL
)
13185 #ifdef ENABLE_FOLD_CHECKING
13186 unsigned char checksum_before_op0
[16],
13187 checksum_before_op1
[16],
13188 checksum_before_op2
[16],
13189 checksum_after_op0
[16],
13190 checksum_after_op1
[16],
13191 checksum_after_op2
[16];
13192 struct md5_ctx ctx
;
13193 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13195 md5_init_ctx (&ctx
);
13196 fold_checksum_tree (op0
, &ctx
, &ht
);
13197 md5_finish_ctx (&ctx
, checksum_before_op0
);
13200 md5_init_ctx (&ctx
);
13201 fold_checksum_tree (op1
, &ctx
, &ht
);
13202 md5_finish_ctx (&ctx
, checksum_before_op1
);
13205 md5_init_ctx (&ctx
);
13206 fold_checksum_tree (op2
, &ctx
, &ht
);
13207 md5_finish_ctx (&ctx
, checksum_before_op2
);
13211 gcc_assert (TREE_CODE_CLASS (code
) != tcc_vl_exp
);
13212 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
13214 tem
= build3_loc (loc
, code
, type
, op0
, op1
, op2 PASS_MEM_STAT
);
13216 #ifdef ENABLE_FOLD_CHECKING
13217 md5_init_ctx (&ctx
);
13218 fold_checksum_tree (op0
, &ctx
, &ht
);
13219 md5_finish_ctx (&ctx
, checksum_after_op0
);
13222 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
13223 fold_check_failed (op0
, tem
);
13225 md5_init_ctx (&ctx
);
13226 fold_checksum_tree (op1
, &ctx
, &ht
);
13227 md5_finish_ctx (&ctx
, checksum_after_op1
);
13230 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
13231 fold_check_failed (op1
, tem
);
13233 md5_init_ctx (&ctx
);
13234 fold_checksum_tree (op2
, &ctx
, &ht
);
13235 md5_finish_ctx (&ctx
, checksum_after_op2
);
13237 if (memcmp (checksum_before_op2
, checksum_after_op2
, 16))
13238 fold_check_failed (op2
, tem
);
13243 /* Fold a CALL_EXPR expression of type TYPE with operands FN and NARGS
13244 arguments in ARGARRAY, and a null static chain.
13245 Return a folded expression if successful. Otherwise, return a CALL_EXPR
13246 of type TYPE from the given operands as constructed by build_call_array. */
13249 fold_build_call_array_loc (location_t loc
, tree type
, tree fn
,
13250 int nargs
, tree
*argarray
)
13253 #ifdef ENABLE_FOLD_CHECKING
13254 unsigned char checksum_before_fn
[16],
13255 checksum_before_arglist
[16],
13256 checksum_after_fn
[16],
13257 checksum_after_arglist
[16];
13258 struct md5_ctx ctx
;
13259 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13262 md5_init_ctx (&ctx
);
13263 fold_checksum_tree (fn
, &ctx
, &ht
);
13264 md5_finish_ctx (&ctx
, checksum_before_fn
);
13267 md5_init_ctx (&ctx
);
13268 for (i
= 0; i
< nargs
; i
++)
13269 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
13270 md5_finish_ctx (&ctx
, checksum_before_arglist
);
13274 tem
= fold_builtin_call_array (loc
, type
, fn
, nargs
, argarray
);
13276 tem
= build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
13278 #ifdef ENABLE_FOLD_CHECKING
13279 md5_init_ctx (&ctx
);
13280 fold_checksum_tree (fn
, &ctx
, &ht
);
13281 md5_finish_ctx (&ctx
, checksum_after_fn
);
13284 if (memcmp (checksum_before_fn
, checksum_after_fn
, 16))
13285 fold_check_failed (fn
, tem
);
13287 md5_init_ctx (&ctx
);
13288 for (i
= 0; i
< nargs
; i
++)
13289 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
13290 md5_finish_ctx (&ctx
, checksum_after_arglist
);
13292 if (memcmp (checksum_before_arglist
, checksum_after_arglist
, 16))
13293 fold_check_failed (NULL_TREE
, tem
);
13298 /* Perform constant folding and related simplification of initializer
13299 expression EXPR. These behave identically to "fold_buildN" but ignore
13300 potential run-time traps and exceptions that fold must preserve. */
13302 #define START_FOLD_INIT \
13303 int saved_signaling_nans = flag_signaling_nans;\
13304 int saved_trapping_math = flag_trapping_math;\
13305 int saved_rounding_math = flag_rounding_math;\
13306 int saved_trapv = flag_trapv;\
13307 int saved_folding_initializer = folding_initializer;\
13308 flag_signaling_nans = 0;\
13309 flag_trapping_math = 0;\
13310 flag_rounding_math = 0;\
13312 folding_initializer = 1;
13314 #define END_FOLD_INIT \
13315 flag_signaling_nans = saved_signaling_nans;\
13316 flag_trapping_math = saved_trapping_math;\
13317 flag_rounding_math = saved_rounding_math;\
13318 flag_trapv = saved_trapv;\
13319 folding_initializer = saved_folding_initializer;
13322 fold_build1_initializer_loc (location_t loc
, enum tree_code code
,
13323 tree type
, tree op
)
13328 result
= fold_build1_loc (loc
, code
, type
, op
);
13335 fold_build2_initializer_loc (location_t loc
, enum tree_code code
,
13336 tree type
, tree op0
, tree op1
)
13341 result
= fold_build2_loc (loc
, code
, type
, op0
, op1
);
13348 fold_build_call_array_initializer_loc (location_t loc
, tree type
, tree fn
,
13349 int nargs
, tree
*argarray
)
13354 result
= fold_build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
13360 #undef START_FOLD_INIT
13361 #undef END_FOLD_INIT
13363 /* Determine if first argument is a multiple of second argument. Return 0 if
13364 it is not, or we cannot easily determined it to be.
13366 An example of the sort of thing we care about (at this point; this routine
13367 could surely be made more general, and expanded to do what the *_DIV_EXPR's
13368 fold cases do now) is discovering that
13370 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
13376 when we know that the two SAVE_EXPR (J * 8) nodes are the same node.
13378 This code also handles discovering that
13380 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
13382 is a multiple of 8 so we don't have to worry about dealing with a
13383 possible remainder.
13385 Note that we *look* inside a SAVE_EXPR only to determine how it was
13386 calculated; it is not safe for fold to do much of anything else with the
13387 internals of a SAVE_EXPR, since it cannot know when it will be evaluated
13388 at run time. For example, the latter example above *cannot* be implemented
13389 as SAVE_EXPR (I) * J or any variant thereof, since the value of J at
13390 evaluation time of the original SAVE_EXPR is not necessarily the same at
13391 the time the new expression is evaluated. The only optimization of this
13392 sort that would be valid is changing
13394 SAVE_EXPR (I) * SAVE_EXPR (SAVE_EXPR (J) * 8)
13398 SAVE_EXPR (I) * SAVE_EXPR (J)
13400 (where the same SAVE_EXPR (J) is used in the original and the
13401 transformed version). */
13404 multiple_of_p (tree type
, const_tree top
, const_tree bottom
)
13409 if (operand_equal_p (top
, bottom
, 0))
13412 if (TREE_CODE (type
) != INTEGER_TYPE
)
13415 switch (TREE_CODE (top
))
13418 /* Bitwise and provides a power of two multiple. If the mask is
13419 a multiple of BOTTOM then TOP is a multiple of BOTTOM. */
13420 if (!integer_pow2p (bottom
))
13422 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13423 || multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13426 if (TREE_CODE (bottom
) == INTEGER_CST
)
13428 op1
= TREE_OPERAND (top
, 0);
13429 op2
= TREE_OPERAND (top
, 1);
13430 if (TREE_CODE (op1
) == INTEGER_CST
)
13431 std::swap (op1
, op2
);
13432 if (TREE_CODE (op2
) == INTEGER_CST
)
13434 if (multiple_of_p (type
, op2
, bottom
))
13436 /* Handle multiple_of_p ((x * 2 + 2) * 4, 8). */
13437 if (multiple_of_p (type
, bottom
, op2
))
13439 widest_int w
= wi::sdiv_trunc (wi::to_widest (bottom
),
13440 wi::to_widest (op2
));
13441 if (wi::fits_to_tree_p (w
, TREE_TYPE (bottom
)))
13443 op2
= wide_int_to_tree (TREE_TYPE (bottom
), w
);
13444 return multiple_of_p (type
, op1
, op2
);
13447 return multiple_of_p (type
, op1
, bottom
);
13450 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13451 || multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13454 /* It is impossible to prove if op0 - op1 is multiple of bottom
13455 precisely, so be conservative here checking if both op0 and op1
13456 are multiple of bottom. Note we check the second operand first
13457 since it's usually simpler. */
13458 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13459 && multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13462 /* The same as MINUS_EXPR, but handle cases like op0 + 0xfffffffd
13463 as op0 - 3 if the expression has unsigned type. For example,
13464 (X / 3) + 0xfffffffd is multiple of 3, but 0xfffffffd is not. */
13465 op1
= TREE_OPERAND (top
, 1);
13466 if (TYPE_UNSIGNED (type
)
13467 && TREE_CODE (op1
) == INTEGER_CST
&& tree_int_cst_sign_bit (op1
))
13468 op1
= fold_build1 (NEGATE_EXPR
, type
, op1
);
13469 return (multiple_of_p (type
, op1
, bottom
)
13470 && multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13473 if (TREE_CODE (TREE_OPERAND (top
, 1)) == INTEGER_CST
)
13475 op1
= TREE_OPERAND (top
, 1);
13476 /* const_binop may not detect overflow correctly,
13477 so check for it explicitly here. */
13478 if (wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)),
13480 && (t1
= fold_convert (type
,
13481 const_binop (LSHIFT_EXPR
, size_one_node
,
13483 && !TREE_OVERFLOW (t1
))
13484 return multiple_of_p (type
, t1
, bottom
);
13489 /* Can't handle conversions from non-integral or wider integral type. */
13490 if ((TREE_CODE (TREE_TYPE (TREE_OPERAND (top
, 0))) != INTEGER_TYPE
)
13491 || (TYPE_PRECISION (type
)
13492 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (top
, 0)))))
13498 return multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
);
13501 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13502 && multiple_of_p (type
, TREE_OPERAND (top
, 2), bottom
));
13505 if (TREE_CODE (bottom
) != INTEGER_CST
13506 || integer_zerop (bottom
)
13507 || (TYPE_UNSIGNED (type
)
13508 && (tree_int_cst_sgn (top
) < 0
13509 || tree_int_cst_sgn (bottom
) < 0)))
13511 return wi::multiple_of_p (wi::to_widest (top
), wi::to_widest (bottom
),
13515 if (TREE_CODE (bottom
) == INTEGER_CST
13516 && (stmt
= SSA_NAME_DEF_STMT (top
)) != NULL
13517 && gimple_code (stmt
) == GIMPLE_ASSIGN
)
13519 enum tree_code code
= gimple_assign_rhs_code (stmt
);
13521 /* Check for special cases to see if top is defined as multiple
13524 top = (X & ~(bottom - 1) ; bottom is power of 2
13530 if (code
== BIT_AND_EXPR
13531 && (op2
= gimple_assign_rhs2 (stmt
)) != NULL_TREE
13532 && TREE_CODE (op2
) == INTEGER_CST
13533 && integer_pow2p (bottom
)
13534 && wi::multiple_of_p (wi::to_widest (op2
),
13535 wi::to_widest (bottom
), UNSIGNED
))
13538 op1
= gimple_assign_rhs1 (stmt
);
13539 if (code
== MINUS_EXPR
13540 && (op2
= gimple_assign_rhs2 (stmt
)) != NULL_TREE
13541 && TREE_CODE (op2
) == SSA_NAME
13542 && (stmt
= SSA_NAME_DEF_STMT (op2
)) != NULL
13543 && gimple_code (stmt
) == GIMPLE_ASSIGN
13544 && (code
= gimple_assign_rhs_code (stmt
)) == TRUNC_MOD_EXPR
13545 && operand_equal_p (op1
, gimple_assign_rhs1 (stmt
), 0)
13546 && operand_equal_p (bottom
, gimple_assign_rhs2 (stmt
), 0))
13553 if (POLY_INT_CST_P (top
) && poly_int_tree_p (bottom
))
13554 return multiple_p (wi::to_poly_widest (top
),
13555 wi::to_poly_widest (bottom
));
13561 #define tree_expr_nonnegative_warnv_p(X, Y) \
13562 _Pragma ("GCC error \"Use RECURSE for recursive calls\"") 0
13564 #define RECURSE(X) \
13565 ((tree_expr_nonnegative_warnv_p) (X, strict_overflow_p, depth + 1))
13567 /* Return true if CODE or TYPE is known to be non-negative. */
13570 tree_simple_nonnegative_warnv_p (enum tree_code code
, tree type
)
13572 if ((TYPE_PRECISION (type
) != 1 || TYPE_UNSIGNED (type
))
13573 && truth_value_p (code
))
13574 /* Truth values evaluate to 0 or 1, which is nonnegative unless we
13575 have a signed:1 type (where the value is -1 and 0). */
13580 /* Return true if (CODE OP0) is known to be non-negative. If the return
13581 value is based on the assumption that signed overflow is undefined,
13582 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13583 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13586 tree_unary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
13587 bool *strict_overflow_p
, int depth
)
13589 if (TYPE_UNSIGNED (type
))
13595 /* We can't return 1 if flag_wrapv is set because
13596 ABS_EXPR<INT_MIN> = INT_MIN. */
13597 if (!ANY_INTEGRAL_TYPE_P (type
))
13599 if (TYPE_OVERFLOW_UNDEFINED (type
))
13601 *strict_overflow_p
= true;
13606 case NON_LVALUE_EXPR
:
13608 case FIX_TRUNC_EXPR
:
13609 return RECURSE (op0
);
13613 tree inner_type
= TREE_TYPE (op0
);
13614 tree outer_type
= type
;
13616 if (TREE_CODE (outer_type
) == REAL_TYPE
)
13618 if (TREE_CODE (inner_type
) == REAL_TYPE
)
13619 return RECURSE (op0
);
13620 if (INTEGRAL_TYPE_P (inner_type
))
13622 if (TYPE_UNSIGNED (inner_type
))
13624 return RECURSE (op0
);
13627 else if (INTEGRAL_TYPE_P (outer_type
))
13629 if (TREE_CODE (inner_type
) == REAL_TYPE
)
13630 return RECURSE (op0
);
13631 if (INTEGRAL_TYPE_P (inner_type
))
13632 return TYPE_PRECISION (inner_type
) < TYPE_PRECISION (outer_type
)
13633 && TYPE_UNSIGNED (inner_type
);
13639 return tree_simple_nonnegative_warnv_p (code
, type
);
13642 /* We don't know sign of `t', so be conservative and return false. */
13646 /* Return true if (CODE OP0 OP1) is known to be non-negative. If the return
13647 value is based on the assumption that signed overflow is undefined,
13648 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13649 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13652 tree_binary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
13653 tree op1
, bool *strict_overflow_p
,
13656 if (TYPE_UNSIGNED (type
))
13661 case POINTER_PLUS_EXPR
:
13663 if (FLOAT_TYPE_P (type
))
13664 return RECURSE (op0
) && RECURSE (op1
);
13666 /* zero_extend(x) + zero_extend(y) is non-negative if x and y are
13667 both unsigned and at least 2 bits shorter than the result. */
13668 if (TREE_CODE (type
) == INTEGER_TYPE
13669 && TREE_CODE (op0
) == NOP_EXPR
13670 && TREE_CODE (op1
) == NOP_EXPR
)
13672 tree inner1
= TREE_TYPE (TREE_OPERAND (op0
, 0));
13673 tree inner2
= TREE_TYPE (TREE_OPERAND (op1
, 0));
13674 if (TREE_CODE (inner1
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner1
)
13675 && TREE_CODE (inner2
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner2
))
13677 unsigned int prec
= MAX (TYPE_PRECISION (inner1
),
13678 TYPE_PRECISION (inner2
)) + 1;
13679 return prec
< TYPE_PRECISION (type
);
13685 if (FLOAT_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
13687 /* x * x is always non-negative for floating point x
13688 or without overflow. */
13689 if (operand_equal_p (op0
, op1
, 0)
13690 || (RECURSE (op0
) && RECURSE (op1
)))
13692 if (ANY_INTEGRAL_TYPE_P (type
)
13693 && TYPE_OVERFLOW_UNDEFINED (type
))
13694 *strict_overflow_p
= true;
13699 /* zero_extend(x) * zero_extend(y) is non-negative if x and y are
13700 both unsigned and their total bits is shorter than the result. */
13701 if (TREE_CODE (type
) == INTEGER_TYPE
13702 && (TREE_CODE (op0
) == NOP_EXPR
|| TREE_CODE (op0
) == INTEGER_CST
)
13703 && (TREE_CODE (op1
) == NOP_EXPR
|| TREE_CODE (op1
) == INTEGER_CST
))
13705 tree inner0
= (TREE_CODE (op0
) == NOP_EXPR
)
13706 ? TREE_TYPE (TREE_OPERAND (op0
, 0))
13708 tree inner1
= (TREE_CODE (op1
) == NOP_EXPR
)
13709 ? TREE_TYPE (TREE_OPERAND (op1
, 0))
13712 bool unsigned0
= TYPE_UNSIGNED (inner0
);
13713 bool unsigned1
= TYPE_UNSIGNED (inner1
);
13715 if (TREE_CODE (op0
) == INTEGER_CST
)
13716 unsigned0
= unsigned0
|| tree_int_cst_sgn (op0
) >= 0;
13718 if (TREE_CODE (op1
) == INTEGER_CST
)
13719 unsigned1
= unsigned1
|| tree_int_cst_sgn (op1
) >= 0;
13721 if (TREE_CODE (inner0
) == INTEGER_TYPE
&& unsigned0
13722 && TREE_CODE (inner1
) == INTEGER_TYPE
&& unsigned1
)
13724 unsigned int precision0
= (TREE_CODE (op0
) == INTEGER_CST
)
13725 ? tree_int_cst_min_precision (op0
, UNSIGNED
)
13726 : TYPE_PRECISION (inner0
);
13728 unsigned int precision1
= (TREE_CODE (op1
) == INTEGER_CST
)
13729 ? tree_int_cst_min_precision (op1
, UNSIGNED
)
13730 : TYPE_PRECISION (inner1
);
13732 return precision0
+ precision1
< TYPE_PRECISION (type
);
13739 return RECURSE (op0
) || RECURSE (op1
);
13745 case TRUNC_DIV_EXPR
:
13746 case CEIL_DIV_EXPR
:
13747 case FLOOR_DIV_EXPR
:
13748 case ROUND_DIV_EXPR
:
13749 return RECURSE (op0
) && RECURSE (op1
);
13751 case TRUNC_MOD_EXPR
:
13752 return RECURSE (op0
);
13754 case FLOOR_MOD_EXPR
:
13755 return RECURSE (op1
);
13757 case CEIL_MOD_EXPR
:
13758 case ROUND_MOD_EXPR
:
13760 return tree_simple_nonnegative_warnv_p (code
, type
);
13763 /* We don't know sign of `t', so be conservative and return false. */
13767 /* Return true if T is known to be non-negative. If the return
13768 value is based on the assumption that signed overflow is undefined,
13769 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13770 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13773 tree_single_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
13775 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
13778 switch (TREE_CODE (t
))
13781 return tree_int_cst_sgn (t
) >= 0;
13784 return ! REAL_VALUE_NEGATIVE (TREE_REAL_CST (t
));
13787 return ! FIXED_VALUE_NEGATIVE (TREE_FIXED_CST (t
));
13790 return RECURSE (TREE_OPERAND (t
, 1)) && RECURSE (TREE_OPERAND (t
, 2));
13793 /* Limit the depth of recursion to avoid quadratic behavior.
13794 This is expected to catch almost all occurrences in practice.
13795 If this code misses important cases that unbounded recursion
13796 would not, passes that need this information could be revised
13797 to provide it through dataflow propagation. */
13798 return (!name_registered_for_update_p (t
)
13799 && depth
< param_max_ssa_name_query_depth
13800 && gimple_stmt_nonnegative_warnv_p (SSA_NAME_DEF_STMT (t
),
13801 strict_overflow_p
, depth
));
13804 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
), TREE_TYPE (t
));
13808 /* Return true if T is known to be non-negative. If the return
13809 value is based on the assumption that signed overflow is undefined,
13810 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13811 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13814 tree_call_nonnegative_warnv_p (tree type
, combined_fn fn
, tree arg0
, tree arg1
,
13815 bool *strict_overflow_p
, int depth
)
13836 case CFN_BUILT_IN_BSWAP32
:
13837 case CFN_BUILT_IN_BSWAP64
:
13843 /* sqrt(-0.0) is -0.0. */
13844 if (!HONOR_SIGNED_ZEROS (element_mode (type
)))
13846 return RECURSE (arg0
);
13874 CASE_CFN_NEARBYINT
:
13875 CASE_CFN_NEARBYINT_FN
:
13880 CASE_CFN_ROUNDEVEN
:
13881 CASE_CFN_ROUNDEVEN_FN
:
13886 CASE_CFN_SIGNIFICAND
:
13891 /* True if the 1st argument is nonnegative. */
13892 return RECURSE (arg0
);
13896 /* True if the 1st OR 2nd arguments are nonnegative. */
13897 return RECURSE (arg0
) || RECURSE (arg1
);
13901 /* True if the 1st AND 2nd arguments are nonnegative. */
13902 return RECURSE (arg0
) && RECURSE (arg1
);
13905 CASE_CFN_COPYSIGN_FN
:
13906 /* True if the 2nd argument is nonnegative. */
13907 return RECURSE (arg1
);
13910 /* True if the 1st argument is nonnegative or the second
13911 argument is an even integer. */
13912 if (TREE_CODE (arg1
) == INTEGER_CST
13913 && (TREE_INT_CST_LOW (arg1
) & 1) == 0)
13915 return RECURSE (arg0
);
13918 /* True if the 1st argument is nonnegative or the second
13919 argument is an even integer valued real. */
13920 if (TREE_CODE (arg1
) == REAL_CST
)
13925 c
= TREE_REAL_CST (arg1
);
13926 n
= real_to_integer (&c
);
13929 REAL_VALUE_TYPE cint
;
13930 real_from_integer (&cint
, VOIDmode
, n
, SIGNED
);
13931 if (real_identical (&c
, &cint
))
13935 return RECURSE (arg0
);
13940 return tree_simple_nonnegative_warnv_p (CALL_EXPR
, type
);
13943 /* Return true if T is known to be non-negative. If the return
13944 value is based on the assumption that signed overflow is undefined,
13945 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13946 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13949 tree_invalid_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
13951 enum tree_code code
= TREE_CODE (t
);
13952 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
13959 tree temp
= TARGET_EXPR_SLOT (t
);
13960 t
= TARGET_EXPR_INITIAL (t
);
13962 /* If the initializer is non-void, then it's a normal expression
13963 that will be assigned to the slot. */
13964 if (!VOID_TYPE_P (t
))
13965 return RECURSE (t
);
13967 /* Otherwise, the initializer sets the slot in some way. One common
13968 way is an assignment statement at the end of the initializer. */
13971 if (TREE_CODE (t
) == BIND_EXPR
)
13972 t
= expr_last (BIND_EXPR_BODY (t
));
13973 else if (TREE_CODE (t
) == TRY_FINALLY_EXPR
13974 || TREE_CODE (t
) == TRY_CATCH_EXPR
)
13975 t
= expr_last (TREE_OPERAND (t
, 0));
13976 else if (TREE_CODE (t
) == STATEMENT_LIST
)
13981 if (TREE_CODE (t
) == MODIFY_EXPR
13982 && TREE_OPERAND (t
, 0) == temp
)
13983 return RECURSE (TREE_OPERAND (t
, 1));
13990 tree arg0
= call_expr_nargs (t
) > 0 ? CALL_EXPR_ARG (t
, 0) : NULL_TREE
;
13991 tree arg1
= call_expr_nargs (t
) > 1 ? CALL_EXPR_ARG (t
, 1) : NULL_TREE
;
13993 return tree_call_nonnegative_warnv_p (TREE_TYPE (t
),
13994 get_call_combined_fn (t
),
13997 strict_overflow_p
, depth
);
13999 case COMPOUND_EXPR
:
14001 return RECURSE (TREE_OPERAND (t
, 1));
14004 return RECURSE (expr_last (TREE_OPERAND (t
, 1)));
14007 return RECURSE (TREE_OPERAND (t
, 0));
14010 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
), TREE_TYPE (t
));
14015 #undef tree_expr_nonnegative_warnv_p
14017 /* Return true if T is known to be non-negative. If the return
14018 value is based on the assumption that signed overflow is undefined,
14019 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14020 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
14023 tree_expr_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
14025 enum tree_code code
;
14026 if (t
== error_mark_node
)
14029 code
= TREE_CODE (t
);
14030 switch (TREE_CODE_CLASS (code
))
14033 case tcc_comparison
:
14034 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
14036 TREE_OPERAND (t
, 0),
14037 TREE_OPERAND (t
, 1),
14038 strict_overflow_p
, depth
);
14041 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
14043 TREE_OPERAND (t
, 0),
14044 strict_overflow_p
, depth
);
14047 case tcc_declaration
:
14048 case tcc_reference
:
14049 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
14057 case TRUTH_AND_EXPR
:
14058 case TRUTH_OR_EXPR
:
14059 case TRUTH_XOR_EXPR
:
14060 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
14062 TREE_OPERAND (t
, 0),
14063 TREE_OPERAND (t
, 1),
14064 strict_overflow_p
, depth
);
14065 case TRUTH_NOT_EXPR
:
14066 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
14068 TREE_OPERAND (t
, 0),
14069 strict_overflow_p
, depth
);
14076 case WITH_SIZE_EXPR
:
14078 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
14081 return tree_invalid_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
14085 /* Return true if `t' is known to be non-negative. Handle warnings
14086 about undefined signed overflow. */
14089 tree_expr_nonnegative_p (tree t
)
14091 bool ret
, strict_overflow_p
;
14093 strict_overflow_p
= false;
14094 ret
= tree_expr_nonnegative_warnv_p (t
, &strict_overflow_p
);
14095 if (strict_overflow_p
)
14096 fold_overflow_warning (("assuming signed overflow does not occur when "
14097 "determining that expression is always "
14099 WARN_STRICT_OVERFLOW_MISC
);
14104 /* Return true when (CODE OP0) is an address and is known to be nonzero.
14105 For floating point we further ensure that T is not denormal.
14106 Similar logic is present in nonzero_address in rtlanal.h.
14108 If the return value is based on the assumption that signed overflow
14109 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14110 change *STRICT_OVERFLOW_P. */
14113 tree_unary_nonzero_warnv_p (enum tree_code code
, tree type
, tree op0
,
14114 bool *strict_overflow_p
)
14119 return tree_expr_nonzero_warnv_p (op0
,
14120 strict_overflow_p
);
14124 tree inner_type
= TREE_TYPE (op0
);
14125 tree outer_type
= type
;
14127 return (TYPE_PRECISION (outer_type
) >= TYPE_PRECISION (inner_type
)
14128 && tree_expr_nonzero_warnv_p (op0
,
14129 strict_overflow_p
));
14133 case NON_LVALUE_EXPR
:
14134 return tree_expr_nonzero_warnv_p (op0
,
14135 strict_overflow_p
);
14144 /* Return true when (CODE OP0 OP1) is an address and is known to be nonzero.
14145 For floating point we further ensure that T is not denormal.
14146 Similar logic is present in nonzero_address in rtlanal.h.
14148 If the return value is based on the assumption that signed overflow
14149 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14150 change *STRICT_OVERFLOW_P. */
14153 tree_binary_nonzero_warnv_p (enum tree_code code
,
14156 tree op1
, bool *strict_overflow_p
)
14158 bool sub_strict_overflow_p
;
14161 case POINTER_PLUS_EXPR
:
14163 if (ANY_INTEGRAL_TYPE_P (type
) && TYPE_OVERFLOW_UNDEFINED (type
))
14165 /* With the presence of negative values it is hard
14166 to say something. */
14167 sub_strict_overflow_p
= false;
14168 if (!tree_expr_nonnegative_warnv_p (op0
,
14169 &sub_strict_overflow_p
)
14170 || !tree_expr_nonnegative_warnv_p (op1
,
14171 &sub_strict_overflow_p
))
14173 /* One of operands must be positive and the other non-negative. */
14174 /* We don't set *STRICT_OVERFLOW_P here: even if this value
14175 overflows, on a twos-complement machine the sum of two
14176 nonnegative numbers can never be zero. */
14177 return (tree_expr_nonzero_warnv_p (op0
,
14179 || tree_expr_nonzero_warnv_p (op1
,
14180 strict_overflow_p
));
14185 if (TYPE_OVERFLOW_UNDEFINED (type
))
14187 if (tree_expr_nonzero_warnv_p (op0
,
14189 && tree_expr_nonzero_warnv_p (op1
,
14190 strict_overflow_p
))
14192 *strict_overflow_p
= true;
14199 sub_strict_overflow_p
= false;
14200 if (tree_expr_nonzero_warnv_p (op0
,
14201 &sub_strict_overflow_p
)
14202 && tree_expr_nonzero_warnv_p (op1
,
14203 &sub_strict_overflow_p
))
14205 if (sub_strict_overflow_p
)
14206 *strict_overflow_p
= true;
14211 sub_strict_overflow_p
= false;
14212 if (tree_expr_nonzero_warnv_p (op0
,
14213 &sub_strict_overflow_p
))
14215 if (sub_strict_overflow_p
)
14216 *strict_overflow_p
= true;
14218 /* When both operands are nonzero, then MAX must be too. */
14219 if (tree_expr_nonzero_warnv_p (op1
,
14220 strict_overflow_p
))
14223 /* MAX where operand 0 is positive is positive. */
14224 return tree_expr_nonnegative_warnv_p (op0
,
14225 strict_overflow_p
);
14227 /* MAX where operand 1 is positive is positive. */
14228 else if (tree_expr_nonzero_warnv_p (op1
,
14229 &sub_strict_overflow_p
)
14230 && tree_expr_nonnegative_warnv_p (op1
,
14231 &sub_strict_overflow_p
))
14233 if (sub_strict_overflow_p
)
14234 *strict_overflow_p
= true;
14240 return (tree_expr_nonzero_warnv_p (op1
,
14242 || tree_expr_nonzero_warnv_p (op0
,
14243 strict_overflow_p
));
14252 /* Return true when T is an address and is known to be nonzero.
14253 For floating point we further ensure that T is not denormal.
14254 Similar logic is present in nonzero_address in rtlanal.h.
14256 If the return value is based on the assumption that signed overflow
14257 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14258 change *STRICT_OVERFLOW_P. */
14261 tree_single_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
14263 bool sub_strict_overflow_p
;
14264 switch (TREE_CODE (t
))
14267 return !integer_zerop (t
);
14271 tree base
= TREE_OPERAND (t
, 0);
14273 if (!DECL_P (base
))
14274 base
= get_base_address (base
);
14276 if (base
&& TREE_CODE (base
) == TARGET_EXPR
)
14277 base
= TARGET_EXPR_SLOT (base
);
14282 /* For objects in symbol table check if we know they are non-zero.
14283 Don't do anything for variables and functions before symtab is built;
14284 it is quite possible that they will be declared weak later. */
14285 int nonzero_addr
= maybe_nonzero_address (base
);
14286 if (nonzero_addr
>= 0)
14287 return nonzero_addr
;
14289 /* Constants are never weak. */
14290 if (CONSTANT_CLASS_P (base
))
14297 sub_strict_overflow_p
= false;
14298 if (tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
14299 &sub_strict_overflow_p
)
14300 && tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 2),
14301 &sub_strict_overflow_p
))
14303 if (sub_strict_overflow_p
)
14304 *strict_overflow_p
= true;
14310 if (!INTEGRAL_TYPE_P (TREE_TYPE (t
)))
14312 return expr_not_equal_to (t
, wi::zero (TYPE_PRECISION (TREE_TYPE (t
))));
14320 #define integer_valued_real_p(X) \
14321 _Pragma ("GCC error \"Use RECURSE for recursive calls\"") 0
14323 #define RECURSE(X) \
14324 ((integer_valued_real_p) (X, depth + 1))
14326 /* Return true if the floating point result of (CODE OP0) has an
14327 integer value. We also allow +Inf, -Inf and NaN to be considered
14328 integer values. Return false for signaling NaN.
14330 DEPTH is the current nesting depth of the query. */
14333 integer_valued_real_unary_p (tree_code code
, tree op0
, int depth
)
14341 return RECURSE (op0
);
14345 tree type
= TREE_TYPE (op0
);
14346 if (TREE_CODE (type
) == INTEGER_TYPE
)
14348 if (TREE_CODE (type
) == REAL_TYPE
)
14349 return RECURSE (op0
);
14359 /* Return true if the floating point result of (CODE OP0 OP1) has an
14360 integer value. We also allow +Inf, -Inf and NaN to be considered
14361 integer values. Return false for signaling NaN.
14363 DEPTH is the current nesting depth of the query. */
14366 integer_valued_real_binary_p (tree_code code
, tree op0
, tree op1
, int depth
)
14375 return RECURSE (op0
) && RECURSE (op1
);
14383 /* Return true if the floating point result of calling FNDECL with arguments
14384 ARG0 and ARG1 has an integer value. We also allow +Inf, -Inf and NaN to be
14385 considered integer values. Return false for signaling NaN. If FNDECL
14386 takes fewer than 2 arguments, the remaining ARGn are null.
14388 DEPTH is the current nesting depth of the query. */
14391 integer_valued_real_call_p (combined_fn fn
, tree arg0
, tree arg1
, int depth
)
14399 CASE_CFN_NEARBYINT
:
14400 CASE_CFN_NEARBYINT_FN
:
14405 CASE_CFN_ROUNDEVEN
:
14406 CASE_CFN_ROUNDEVEN_FN
:
14415 return RECURSE (arg0
) && RECURSE (arg1
);
14423 /* Return true if the floating point expression T (a GIMPLE_SINGLE_RHS)
14424 has an integer value. We also allow +Inf, -Inf and NaN to be
14425 considered integer values. Return false for signaling NaN.
14427 DEPTH is the current nesting depth of the query. */
14430 integer_valued_real_single_p (tree t
, int depth
)
14432 switch (TREE_CODE (t
))
14435 return real_isinteger (TREE_REAL_CST_PTR (t
), TYPE_MODE (TREE_TYPE (t
)));
14438 return RECURSE (TREE_OPERAND (t
, 1)) && RECURSE (TREE_OPERAND (t
, 2));
14441 /* Limit the depth of recursion to avoid quadratic behavior.
14442 This is expected to catch almost all occurrences in practice.
14443 If this code misses important cases that unbounded recursion
14444 would not, passes that need this information could be revised
14445 to provide it through dataflow propagation. */
14446 return (!name_registered_for_update_p (t
)
14447 && depth
< param_max_ssa_name_query_depth
14448 && gimple_stmt_integer_valued_real_p (SSA_NAME_DEF_STMT (t
),
14457 /* Return true if the floating point expression T (a GIMPLE_INVALID_RHS)
14458 has an integer value. We also allow +Inf, -Inf and NaN to be
14459 considered integer values. Return false for signaling NaN.
14461 DEPTH is the current nesting depth of the query. */
14464 integer_valued_real_invalid_p (tree t
, int depth
)
14466 switch (TREE_CODE (t
))
14468 case COMPOUND_EXPR
:
14471 return RECURSE (TREE_OPERAND (t
, 1));
14474 return RECURSE (TREE_OPERAND (t
, 0));
14483 #undef integer_valued_real_p
14485 /* Return true if the floating point expression T has an integer value.
14486 We also allow +Inf, -Inf and NaN to be considered integer values.
14487 Return false for signaling NaN.
14489 DEPTH is the current nesting depth of the query. */
14492 integer_valued_real_p (tree t
, int depth
)
14494 if (t
== error_mark_node
)
14497 STRIP_ANY_LOCATION_WRAPPER (t
);
14499 tree_code code
= TREE_CODE (t
);
14500 switch (TREE_CODE_CLASS (code
))
14503 case tcc_comparison
:
14504 return integer_valued_real_binary_p (code
, TREE_OPERAND (t
, 0),
14505 TREE_OPERAND (t
, 1), depth
);
14508 return integer_valued_real_unary_p (code
, TREE_OPERAND (t
, 0), depth
);
14511 case tcc_declaration
:
14512 case tcc_reference
:
14513 return integer_valued_real_single_p (t
, depth
);
14523 return integer_valued_real_single_p (t
, depth
);
14527 tree arg0
= (call_expr_nargs (t
) > 0
14528 ? CALL_EXPR_ARG (t
, 0)
14530 tree arg1
= (call_expr_nargs (t
) > 1
14531 ? CALL_EXPR_ARG (t
, 1)
14533 return integer_valued_real_call_p (get_call_combined_fn (t
),
14534 arg0
, arg1
, depth
);
14538 return integer_valued_real_invalid_p (t
, depth
);
14542 /* Given the components of a binary expression CODE, TYPE, OP0 and OP1,
14543 attempt to fold the expression to a constant without modifying TYPE,
14546 If the expression could be simplified to a constant, then return
14547 the constant. If the expression would not be simplified to a
14548 constant, then return NULL_TREE. */
14551 fold_binary_to_constant (enum tree_code code
, tree type
, tree op0
, tree op1
)
14553 tree tem
= fold_binary (code
, type
, op0
, op1
);
14554 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
14557 /* Given the components of a unary expression CODE, TYPE and OP0,
14558 attempt to fold the expression to a constant without modifying
14561 If the expression could be simplified to a constant, then return
14562 the constant. If the expression would not be simplified to a
14563 constant, then return NULL_TREE. */
14566 fold_unary_to_constant (enum tree_code code
, tree type
, tree op0
)
14568 tree tem
= fold_unary (code
, type
, op0
);
14569 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
14572 /* If EXP represents referencing an element in a constant string
14573 (either via pointer arithmetic or array indexing), return the
14574 tree representing the value accessed, otherwise return NULL. */
14577 fold_read_from_constant_string (tree exp
)
14579 if ((TREE_CODE (exp
) == INDIRECT_REF
14580 || TREE_CODE (exp
) == ARRAY_REF
)
14581 && TREE_CODE (TREE_TYPE (exp
)) == INTEGER_TYPE
)
14583 tree exp1
= TREE_OPERAND (exp
, 0);
14586 location_t loc
= EXPR_LOCATION (exp
);
14588 if (TREE_CODE (exp
) == INDIRECT_REF
)
14589 string
= string_constant (exp1
, &index
, NULL
, NULL
);
14592 tree low_bound
= array_ref_low_bound (exp
);
14593 index
= fold_convert_loc (loc
, sizetype
, TREE_OPERAND (exp
, 1));
14595 /* Optimize the special-case of a zero lower bound.
14597 We convert the low_bound to sizetype to avoid some problems
14598 with constant folding. (E.g. suppose the lower bound is 1,
14599 and its mode is QI. Without the conversion,l (ARRAY
14600 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
14601 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
14602 if (! integer_zerop (low_bound
))
14603 index
= size_diffop_loc (loc
, index
,
14604 fold_convert_loc (loc
, sizetype
, low_bound
));
14609 scalar_int_mode char_mode
;
14611 && TYPE_MODE (TREE_TYPE (exp
)) == TYPE_MODE (TREE_TYPE (TREE_TYPE (string
)))
14612 && TREE_CODE (string
) == STRING_CST
14613 && TREE_CODE (index
) == INTEGER_CST
14614 && compare_tree_int (index
, TREE_STRING_LENGTH (string
)) < 0
14615 && is_int_mode (TYPE_MODE (TREE_TYPE (TREE_TYPE (string
))),
14617 && GET_MODE_SIZE (char_mode
) == 1)
14618 return build_int_cst_type (TREE_TYPE (exp
),
14619 (TREE_STRING_POINTER (string
)
14620 [TREE_INT_CST_LOW (index
)]));
14625 /* Folds a read from vector element at IDX of vector ARG. */
14628 fold_read_from_vector (tree arg
, poly_uint64 idx
)
14630 unsigned HOST_WIDE_INT i
;
14631 if (known_lt (idx
, TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg
)))
14632 && known_ge (idx
, 0u)
14633 && idx
.is_constant (&i
))
14635 if (TREE_CODE (arg
) == VECTOR_CST
)
14636 return VECTOR_CST_ELT (arg
, i
);
14637 else if (TREE_CODE (arg
) == CONSTRUCTOR
)
14639 if (i
>= CONSTRUCTOR_NELTS (arg
))
14640 return build_zero_cst (TREE_TYPE (TREE_TYPE (arg
)));
14641 return CONSTRUCTOR_ELT (arg
, i
)->value
;
14647 /* Return the tree for neg (ARG0) when ARG0 is known to be either
14648 an integer constant, real, or fixed-point constant.
14650 TYPE is the type of the result. */
14653 fold_negate_const (tree arg0
, tree type
)
14655 tree t
= NULL_TREE
;
14657 switch (TREE_CODE (arg0
))
14660 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
14665 FIXED_VALUE_TYPE f
;
14666 bool overflow_p
= fixed_arithmetic (&f
, NEGATE_EXPR
,
14667 &(TREE_FIXED_CST (arg0
)), NULL
,
14668 TYPE_SATURATING (type
));
14669 t
= build_fixed (type
, f
);
14670 /* Propagate overflow flags. */
14671 if (overflow_p
| TREE_OVERFLOW (arg0
))
14672 TREE_OVERFLOW (t
) = 1;
14677 if (poly_int_tree_p (arg0
))
14679 wi::overflow_type overflow
;
14680 poly_wide_int res
= wi::neg (wi::to_poly_wide (arg0
), &overflow
);
14681 t
= force_fit_type (type
, res
, 1,
14682 (overflow
&& ! TYPE_UNSIGNED (type
))
14683 || TREE_OVERFLOW (arg0
));
14687 gcc_unreachable ();
14693 /* Return the tree for abs (ARG0) when ARG0 is known to be either
14694 an integer constant or real constant.
14696 TYPE is the type of the result. */
14699 fold_abs_const (tree arg0
, tree type
)
14701 tree t
= NULL_TREE
;
14703 switch (TREE_CODE (arg0
))
14707 /* If the value is unsigned or non-negative, then the absolute value
14708 is the same as the ordinary value. */
14709 wide_int val
= wi::to_wide (arg0
);
14710 wi::overflow_type overflow
= wi::OVF_NONE
;
14711 if (!wi::neg_p (val
, TYPE_SIGN (TREE_TYPE (arg0
))))
14714 /* If the value is negative, then the absolute value is
14717 val
= wi::neg (val
, &overflow
);
14719 /* Force to the destination type, set TREE_OVERFLOW for signed
14721 t
= force_fit_type (type
, val
, 1, overflow
| TREE_OVERFLOW (arg0
));
14726 if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg0
)))
14727 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
14733 gcc_unreachable ();
14739 /* Return the tree for not (ARG0) when ARG0 is known to be an integer
14740 constant. TYPE is the type of the result. */
14743 fold_not_const (const_tree arg0
, tree type
)
14745 gcc_assert (TREE_CODE (arg0
) == INTEGER_CST
);
14747 return force_fit_type (type
, ~wi::to_wide (arg0
), 0, TREE_OVERFLOW (arg0
));
14750 /* Given CODE, a relational operator, the target type, TYPE and two
14751 constant operands OP0 and OP1, return the result of the
14752 relational operation. If the result is not a compile time
14753 constant, then return NULL_TREE. */
14756 fold_relational_const (enum tree_code code
, tree type
, tree op0
, tree op1
)
14758 int result
, invert
;
14760 /* From here on, the only cases we handle are when the result is
14761 known to be a constant. */
14763 if (TREE_CODE (op0
) == REAL_CST
&& TREE_CODE (op1
) == REAL_CST
)
14765 const REAL_VALUE_TYPE
*c0
= TREE_REAL_CST_PTR (op0
);
14766 const REAL_VALUE_TYPE
*c1
= TREE_REAL_CST_PTR (op1
);
14768 /* Handle the cases where either operand is a NaN. */
14769 if (real_isnan (c0
) || real_isnan (c1
))
14779 case UNORDERED_EXPR
:
14793 if (flag_trapping_math
)
14799 gcc_unreachable ();
14802 return constant_boolean_node (result
, type
);
14805 return constant_boolean_node (real_compare (code
, c0
, c1
), type
);
14808 if (TREE_CODE (op0
) == FIXED_CST
&& TREE_CODE (op1
) == FIXED_CST
)
14810 const FIXED_VALUE_TYPE
*c0
= TREE_FIXED_CST_PTR (op0
);
14811 const FIXED_VALUE_TYPE
*c1
= TREE_FIXED_CST_PTR (op1
);
14812 return constant_boolean_node (fixed_compare (code
, c0
, c1
), type
);
14815 /* Handle equality/inequality of complex constants. */
14816 if (TREE_CODE (op0
) == COMPLEX_CST
&& TREE_CODE (op1
) == COMPLEX_CST
)
14818 tree rcond
= fold_relational_const (code
, type
,
14819 TREE_REALPART (op0
),
14820 TREE_REALPART (op1
));
14821 tree icond
= fold_relational_const (code
, type
,
14822 TREE_IMAGPART (op0
),
14823 TREE_IMAGPART (op1
));
14824 if (code
== EQ_EXPR
)
14825 return fold_build2 (TRUTH_ANDIF_EXPR
, type
, rcond
, icond
);
14826 else if (code
== NE_EXPR
)
14827 return fold_build2 (TRUTH_ORIF_EXPR
, type
, rcond
, icond
);
14832 if (TREE_CODE (op0
) == VECTOR_CST
&& TREE_CODE (op1
) == VECTOR_CST
)
14834 if (!VECTOR_TYPE_P (type
))
14836 /* Have vector comparison with scalar boolean result. */
14837 gcc_assert ((code
== EQ_EXPR
|| code
== NE_EXPR
)
14838 && known_eq (VECTOR_CST_NELTS (op0
),
14839 VECTOR_CST_NELTS (op1
)));
14840 unsigned HOST_WIDE_INT nunits
;
14841 if (!VECTOR_CST_NELTS (op0
).is_constant (&nunits
))
14843 for (unsigned i
= 0; i
< nunits
; i
++)
14845 tree elem0
= VECTOR_CST_ELT (op0
, i
);
14846 tree elem1
= VECTOR_CST_ELT (op1
, i
);
14847 tree tmp
= fold_relational_const (EQ_EXPR
, type
, elem0
, elem1
);
14848 if (tmp
== NULL_TREE
)
14850 if (integer_zerop (tmp
))
14851 return constant_boolean_node (code
== NE_EXPR
, type
);
14853 return constant_boolean_node (code
== EQ_EXPR
, type
);
14855 tree_vector_builder elts
;
14856 if (!elts
.new_binary_operation (type
, op0
, op1
, false))
14858 unsigned int count
= elts
.encoded_nelts ();
14859 for (unsigned i
= 0; i
< count
; i
++)
14861 tree elem_type
= TREE_TYPE (type
);
14862 tree elem0
= VECTOR_CST_ELT (op0
, i
);
14863 tree elem1
= VECTOR_CST_ELT (op1
, i
);
14865 tree tem
= fold_relational_const (code
, elem_type
,
14868 if (tem
== NULL_TREE
)
14871 elts
.quick_push (build_int_cst (elem_type
,
14872 integer_zerop (tem
) ? 0 : -1));
14875 return elts
.build ();
14878 /* From here on we only handle LT, LE, GT, GE, EQ and NE.
14880 To compute GT, swap the arguments and do LT.
14881 To compute GE, do LT and invert the result.
14882 To compute LE, swap the arguments, do LT and invert the result.
14883 To compute NE, do EQ and invert the result.
14885 Therefore, the code below must handle only EQ and LT. */
14887 if (code
== LE_EXPR
|| code
== GT_EXPR
)
14889 std::swap (op0
, op1
);
14890 code
= swap_tree_comparison (code
);
14893 /* Note that it is safe to invert for real values here because we
14894 have already handled the one case that it matters. */
14897 if (code
== NE_EXPR
|| code
== GE_EXPR
)
14900 code
= invert_tree_comparison (code
, false);
14903 /* Compute a result for LT or EQ if args permit;
14904 Otherwise return T. */
14905 if (TREE_CODE (op0
) == INTEGER_CST
&& TREE_CODE (op1
) == INTEGER_CST
)
14907 if (code
== EQ_EXPR
)
14908 result
= tree_int_cst_equal (op0
, op1
);
14910 result
= tree_int_cst_lt (op0
, op1
);
14917 return constant_boolean_node (result
, type
);
14920 /* If necessary, return a CLEANUP_POINT_EXPR for EXPR with the
14921 indicated TYPE. If no CLEANUP_POINT_EXPR is necessary, return EXPR
14925 fold_build_cleanup_point_expr (tree type
, tree expr
)
14927 /* If the expression does not have side effects then we don't have to wrap
14928 it with a cleanup point expression. */
14929 if (!TREE_SIDE_EFFECTS (expr
))
14932 /* If the expression is a return, check to see if the expression inside the
14933 return has no side effects or the right hand side of the modify expression
14934 inside the return. If either don't have side effects set we don't need to
14935 wrap the expression in a cleanup point expression. Note we don't check the
14936 left hand side of the modify because it should always be a return decl. */
14937 if (TREE_CODE (expr
) == RETURN_EXPR
)
14939 tree op
= TREE_OPERAND (expr
, 0);
14940 if (!op
|| !TREE_SIDE_EFFECTS (op
))
14942 op
= TREE_OPERAND (op
, 1);
14943 if (!TREE_SIDE_EFFECTS (op
))
14947 return build1_loc (EXPR_LOCATION (expr
), CLEANUP_POINT_EXPR
, type
, expr
);
14950 /* Given a pointer value OP0 and a type TYPE, return a simplified version
14951 of an indirection through OP0, or NULL_TREE if no simplification is
14955 fold_indirect_ref_1 (location_t loc
, tree type
, tree op0
)
14959 poly_uint64 const_op01
;
14962 subtype
= TREE_TYPE (sub
);
14963 if (!POINTER_TYPE_P (subtype
)
14964 || TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (op0
)))
14967 if (TREE_CODE (sub
) == ADDR_EXPR
)
14969 tree op
= TREE_OPERAND (sub
, 0);
14970 tree optype
= TREE_TYPE (op
);
14972 /* *&CONST_DECL -> to the value of the const decl. */
14973 if (TREE_CODE (op
) == CONST_DECL
)
14974 return DECL_INITIAL (op
);
14975 /* *&p => p; make sure to handle *&"str"[cst] here. */
14976 if (type
== optype
)
14978 tree fop
= fold_read_from_constant_string (op
);
14984 /* *(foo *)&fooarray => fooarray[0] */
14985 else if (TREE_CODE (optype
) == ARRAY_TYPE
14986 && type
== TREE_TYPE (optype
)
14987 && (!in_gimple_form
14988 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
14990 tree type_domain
= TYPE_DOMAIN (optype
);
14991 tree min_val
= size_zero_node
;
14992 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
14993 min_val
= TYPE_MIN_VALUE (type_domain
);
14995 && TREE_CODE (min_val
) != INTEGER_CST
)
14997 return build4_loc (loc
, ARRAY_REF
, type
, op
, min_val
,
14998 NULL_TREE
, NULL_TREE
);
15000 /* *(foo *)&complexfoo => __real__ complexfoo */
15001 else if (TREE_CODE (optype
) == COMPLEX_TYPE
15002 && type
== TREE_TYPE (optype
))
15003 return fold_build1_loc (loc
, REALPART_EXPR
, type
, op
);
15004 /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */
15005 else if (VECTOR_TYPE_P (optype
)
15006 && type
== TREE_TYPE (optype
))
15008 tree part_width
= TYPE_SIZE (type
);
15009 tree index
= bitsize_int (0);
15010 return fold_build3_loc (loc
, BIT_FIELD_REF
, type
, op
, part_width
,
15015 if (TREE_CODE (sub
) == POINTER_PLUS_EXPR
15016 && poly_int_tree_p (TREE_OPERAND (sub
, 1), &const_op01
))
15018 tree op00
= TREE_OPERAND (sub
, 0);
15019 tree op01
= TREE_OPERAND (sub
, 1);
15022 if (TREE_CODE (op00
) == ADDR_EXPR
)
15025 op00
= TREE_OPERAND (op00
, 0);
15026 op00type
= TREE_TYPE (op00
);
15028 /* ((foo*)&vectorfoo)[1] => BIT_FIELD_REF<vectorfoo,...> */
15029 if (VECTOR_TYPE_P (op00type
)
15030 && type
== TREE_TYPE (op00type
)
15031 /* POINTER_PLUS_EXPR second operand is sizetype, unsigned,
15032 but we want to treat offsets with MSB set as negative.
15033 For the code below negative offsets are invalid and
15034 TYPE_SIZE of the element is something unsigned, so
15035 check whether op01 fits into poly_int64, which implies
15036 it is from 0 to INTTYPE_MAXIMUM (HOST_WIDE_INT), and
15037 then just use poly_uint64 because we want to treat the
15038 value as unsigned. */
15039 && tree_fits_poly_int64_p (op01
))
15041 tree part_width
= TYPE_SIZE (type
);
15042 poly_uint64 max_offset
15043 = (tree_to_uhwi (part_width
) / BITS_PER_UNIT
15044 * TYPE_VECTOR_SUBPARTS (op00type
));
15045 if (known_lt (const_op01
, max_offset
))
15047 tree index
= bitsize_int (const_op01
* BITS_PER_UNIT
);
15048 return fold_build3_loc (loc
,
15049 BIT_FIELD_REF
, type
, op00
,
15050 part_width
, index
);
15053 /* ((foo*)&complexfoo)[1] => __imag__ complexfoo */
15054 else if (TREE_CODE (op00type
) == COMPLEX_TYPE
15055 && type
== TREE_TYPE (op00type
))
15057 if (known_eq (wi::to_poly_offset (TYPE_SIZE_UNIT (type
)),
15059 return fold_build1_loc (loc
, IMAGPART_EXPR
, type
, op00
);
15061 /* ((foo *)&fooarray)[1] => fooarray[1] */
15062 else if (TREE_CODE (op00type
) == ARRAY_TYPE
15063 && type
== TREE_TYPE (op00type
))
15065 tree type_domain
= TYPE_DOMAIN (op00type
);
15066 tree min_val
= size_zero_node
;
15067 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
15068 min_val
= TYPE_MIN_VALUE (type_domain
);
15069 poly_uint64 type_size
, index
;
15070 if (poly_int_tree_p (min_val
)
15071 && poly_int_tree_p (TYPE_SIZE_UNIT (type
), &type_size
)
15072 && multiple_p (const_op01
, type_size
, &index
))
15074 poly_offset_int off
= index
+ wi::to_poly_offset (min_val
);
15075 op01
= wide_int_to_tree (sizetype
, off
);
15076 return build4_loc (loc
, ARRAY_REF
, type
, op00
, op01
,
15077 NULL_TREE
, NULL_TREE
);
15083 /* *(foo *)fooarrptr => (*fooarrptr)[0] */
15084 if (TREE_CODE (TREE_TYPE (subtype
)) == ARRAY_TYPE
15085 && type
== TREE_TYPE (TREE_TYPE (subtype
))
15086 && (!in_gimple_form
15087 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
15090 tree min_val
= size_zero_node
;
15091 sub
= build_fold_indirect_ref_loc (loc
, sub
);
15092 type_domain
= TYPE_DOMAIN (TREE_TYPE (sub
));
15093 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
15094 min_val
= TYPE_MIN_VALUE (type_domain
);
15096 && TREE_CODE (min_val
) != INTEGER_CST
)
15098 return build4_loc (loc
, ARRAY_REF
, type
, sub
, min_val
, NULL_TREE
,
15105 /* Builds an expression for an indirection through T, simplifying some
15109 build_fold_indirect_ref_loc (location_t loc
, tree t
)
15111 tree type
= TREE_TYPE (TREE_TYPE (t
));
15112 tree sub
= fold_indirect_ref_1 (loc
, type
, t
);
15117 return build1_loc (loc
, INDIRECT_REF
, type
, t
);
15120 /* Given an INDIRECT_REF T, return either T or a simplified version. */
15123 fold_indirect_ref_loc (location_t loc
, tree t
)
15125 tree sub
= fold_indirect_ref_1 (loc
, TREE_TYPE (t
), TREE_OPERAND (t
, 0));
15133 /* Strip non-trapping, non-side-effecting tree nodes from an expression
15134 whose result is ignored. The type of the returned tree need not be
15135 the same as the original expression. */
15138 fold_ignored_result (tree t
)
15140 if (!TREE_SIDE_EFFECTS (t
))
15141 return integer_zero_node
;
15144 switch (TREE_CODE_CLASS (TREE_CODE (t
)))
15147 t
= TREE_OPERAND (t
, 0);
15151 case tcc_comparison
:
15152 if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
15153 t
= TREE_OPERAND (t
, 0);
15154 else if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 0)))
15155 t
= TREE_OPERAND (t
, 1);
15160 case tcc_expression
:
15161 switch (TREE_CODE (t
))
15163 case COMPOUND_EXPR
:
15164 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
15166 t
= TREE_OPERAND (t
, 0);
15170 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1))
15171 || TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 2)))
15173 t
= TREE_OPERAND (t
, 0);
15186 /* Return the value of VALUE, rounded up to a multiple of DIVISOR. */
15189 round_up_loc (location_t loc
, tree value
, unsigned int divisor
)
15191 tree div
= NULL_TREE
;
15196 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
15197 have to do anything. Only do this when we are not given a const,
15198 because in that case, this check is more expensive than just
15200 if (TREE_CODE (value
) != INTEGER_CST
)
15202 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15204 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
15208 /* If divisor is a power of two, simplify this to bit manipulation. */
15209 if (pow2_or_zerop (divisor
))
15211 if (TREE_CODE (value
) == INTEGER_CST
)
15213 wide_int val
= wi::to_wide (value
);
15216 if ((val
& (divisor
- 1)) == 0)
15219 overflow_p
= TREE_OVERFLOW (value
);
15220 val
+= divisor
- 1;
15221 val
&= (int) -divisor
;
15225 return force_fit_type (TREE_TYPE (value
), val
, -1, overflow_p
);
15231 t
= build_int_cst (TREE_TYPE (value
), divisor
- 1);
15232 value
= size_binop_loc (loc
, PLUS_EXPR
, value
, t
);
15233 t
= build_int_cst (TREE_TYPE (value
), - (int) divisor
);
15234 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
15240 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15241 value
= size_binop_loc (loc
, CEIL_DIV_EXPR
, value
, div
);
15242 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
15248 /* Likewise, but round down. */
15251 round_down_loc (location_t loc
, tree value
, int divisor
)
15253 tree div
= NULL_TREE
;
15255 gcc_assert (divisor
> 0);
15259 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
15260 have to do anything. Only do this when we are not given a const,
15261 because in that case, this check is more expensive than just
15263 if (TREE_CODE (value
) != INTEGER_CST
)
15265 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15267 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
15271 /* If divisor is a power of two, simplify this to bit manipulation. */
15272 if (pow2_or_zerop (divisor
))
15276 t
= build_int_cst (TREE_TYPE (value
), -divisor
);
15277 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
15282 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15283 value
= size_binop_loc (loc
, FLOOR_DIV_EXPR
, value
, div
);
15284 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
15290 /* Returns the pointer to the base of the object addressed by EXP and
15291 extracts the information about the offset of the access, storing it
15292 to PBITPOS and POFFSET. */
15295 split_address_to_core_and_offset (tree exp
,
15296 poly_int64_pod
*pbitpos
, tree
*poffset
)
15300 int unsignedp
, reversep
, volatilep
;
15301 poly_int64 bitsize
;
15302 location_t loc
= EXPR_LOCATION (exp
);
15304 if (TREE_CODE (exp
) == ADDR_EXPR
)
15306 core
= get_inner_reference (TREE_OPERAND (exp
, 0), &bitsize
, pbitpos
,
15307 poffset
, &mode
, &unsignedp
, &reversep
,
15309 core
= build_fold_addr_expr_loc (loc
, core
);
15311 else if (TREE_CODE (exp
) == POINTER_PLUS_EXPR
)
15313 core
= TREE_OPERAND (exp
, 0);
15316 *poffset
= TREE_OPERAND (exp
, 1);
15317 if (poly_int_tree_p (*poffset
))
15319 poly_offset_int tem
15320 = wi::sext (wi::to_poly_offset (*poffset
),
15321 TYPE_PRECISION (TREE_TYPE (*poffset
)));
15322 tem
<<= LOG2_BITS_PER_UNIT
;
15323 if (tem
.to_shwi (pbitpos
))
15324 *poffset
= NULL_TREE
;
15331 *poffset
= NULL_TREE
;
15337 /* Returns true if addresses of E1 and E2 differ by a constant, false
15338 otherwise. If they do, E1 - E2 is stored in *DIFF. */
15341 ptr_difference_const (tree e1
, tree e2
, poly_int64_pod
*diff
)
15344 poly_int64 bitpos1
, bitpos2
;
15345 tree toffset1
, toffset2
, tdiff
, type
;
15347 core1
= split_address_to_core_and_offset (e1
, &bitpos1
, &toffset1
);
15348 core2
= split_address_to_core_and_offset (e2
, &bitpos2
, &toffset2
);
15350 poly_int64 bytepos1
, bytepos2
;
15351 if (!multiple_p (bitpos1
, BITS_PER_UNIT
, &bytepos1
)
15352 || !multiple_p (bitpos2
, BITS_PER_UNIT
, &bytepos2
)
15353 || !operand_equal_p (core1
, core2
, 0))
15356 if (toffset1
&& toffset2
)
15358 type
= TREE_TYPE (toffset1
);
15359 if (type
!= TREE_TYPE (toffset2
))
15360 toffset2
= fold_convert (type
, toffset2
);
15362 tdiff
= fold_build2 (MINUS_EXPR
, type
, toffset1
, toffset2
);
15363 if (!cst_and_fits_in_hwi (tdiff
))
15366 *diff
= int_cst_value (tdiff
);
15368 else if (toffset1
|| toffset2
)
15370 /* If only one of the offsets is non-constant, the difference cannot
15377 *diff
+= bytepos1
- bytepos2
;
15381 /* Return OFF converted to a pointer offset type suitable as offset for
15382 POINTER_PLUS_EXPR. Use location LOC for this conversion. */
15384 convert_to_ptrofftype_loc (location_t loc
, tree off
)
15386 return fold_convert_loc (loc
, sizetype
, off
);
15389 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
15391 fold_build_pointer_plus_loc (location_t loc
, tree ptr
, tree off
)
15393 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
15394 ptr
, convert_to_ptrofftype_loc (loc
, off
));
15397 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
15399 fold_build_pointer_plus_hwi_loc (location_t loc
, tree ptr
, HOST_WIDE_INT off
)
15401 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
15402 ptr
, size_int (off
));
15405 /* Return a pointer P to a NUL-terminated string representing the sequence
15406 of constant characters referred to by SRC (or a subsequence of such
15407 characters within it if SRC is a reference to a string plus some
15408 constant offset). If STRLEN is non-null, store the number of bytes
15409 in the string constant including the terminating NUL char. *STRLEN is
15410 typically strlen(P) + 1 in the absence of embedded NUL characters. */
15413 c_getstr (tree src
, unsigned HOST_WIDE_INT
*strlen
/* = NULL */)
15421 src
= string_constant (src
, &offset_node
, &mem_size
, NULL
);
15425 unsigned HOST_WIDE_INT offset
= 0;
15426 if (offset_node
!= NULL_TREE
)
15428 if (!tree_fits_uhwi_p (offset_node
))
15431 offset
= tree_to_uhwi (offset_node
);
15434 if (!tree_fits_uhwi_p (mem_size
))
15437 /* STRING_LENGTH is the size of the string literal, including any
15438 embedded NULs. STRING_SIZE is the size of the array the string
15439 literal is stored in. */
15440 unsigned HOST_WIDE_INT string_length
= TREE_STRING_LENGTH (src
);
15441 unsigned HOST_WIDE_INT string_size
= tree_to_uhwi (mem_size
);
15443 /* Ideally this would turn into a gcc_checking_assert over time. */
15444 if (string_length
> string_size
)
15445 string_length
= string_size
;
15447 const char *string
= TREE_STRING_POINTER (src
);
15449 /* Ideally this would turn into a gcc_checking_assert over time. */
15450 if (string_length
> string_size
)
15451 string_length
= string_size
;
15453 if (string_length
== 0
15454 || offset
>= string_size
)
15459 /* Compute and store the length of the substring at OFFSET.
15460 All offsets past the initial length refer to null strings. */
15461 if (offset
< string_length
)
15462 *strlen
= string_length
- offset
;
15468 tree eltype
= TREE_TYPE (TREE_TYPE (src
));
15469 /* Support only properly NUL-terminated single byte strings. */
15470 if (tree_to_uhwi (TYPE_SIZE_UNIT (eltype
)) != 1)
15472 if (string
[string_length
- 1] != '\0')
15476 return offset
< string_length
? string
+ offset
: "";
15479 /* Given a tree T, compute which bits in T may be nonzero. */
15482 tree_nonzero_bits (const_tree t
)
15484 switch (TREE_CODE (t
))
15487 return wi::to_wide (t
);
15489 return get_nonzero_bits (t
);
15490 case NON_LVALUE_EXPR
:
15492 return tree_nonzero_bits (TREE_OPERAND (t
, 0));
15494 return wi::bit_and (tree_nonzero_bits (TREE_OPERAND (t
, 0)),
15495 tree_nonzero_bits (TREE_OPERAND (t
, 1)));
15498 return wi::bit_or (tree_nonzero_bits (TREE_OPERAND (t
, 0)),
15499 tree_nonzero_bits (TREE_OPERAND (t
, 1)));
15501 return wi::bit_or (tree_nonzero_bits (TREE_OPERAND (t
, 1)),
15502 tree_nonzero_bits (TREE_OPERAND (t
, 2)));
15504 return wide_int::from (tree_nonzero_bits (TREE_OPERAND (t
, 0)),
15505 TYPE_PRECISION (TREE_TYPE (t
)),
15506 TYPE_SIGN (TREE_TYPE (TREE_OPERAND (t
, 0))));
15508 if (INTEGRAL_TYPE_P (TREE_TYPE (t
)))
15510 wide_int nzbits1
= tree_nonzero_bits (TREE_OPERAND (t
, 0));
15511 wide_int nzbits2
= tree_nonzero_bits (TREE_OPERAND (t
, 1));
15512 if (wi::bit_and (nzbits1
, nzbits2
) == 0)
15513 return wi::bit_or (nzbits1
, nzbits2
);
15517 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
15519 tree type
= TREE_TYPE (t
);
15520 wide_int nzbits
= tree_nonzero_bits (TREE_OPERAND (t
, 0));
15521 wide_int arg1
= wi::to_wide (TREE_OPERAND (t
, 1),
15522 TYPE_PRECISION (type
));
15523 return wi::neg_p (arg1
)
15524 ? wi::rshift (nzbits
, -arg1
, TYPE_SIGN (type
))
15525 : wi::lshift (nzbits
, arg1
);
15529 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
15531 tree type
= TREE_TYPE (t
);
15532 wide_int nzbits
= tree_nonzero_bits (TREE_OPERAND (t
, 0));
15533 wide_int arg1
= wi::to_wide (TREE_OPERAND (t
, 1),
15534 TYPE_PRECISION (type
));
15535 return wi::neg_p (arg1
)
15536 ? wi::lshift (nzbits
, -arg1
)
15537 : wi::rshift (nzbits
, arg1
, TYPE_SIGN (type
));
15544 return wi::shwi (-1, TYPE_PRECISION (TREE_TYPE (t
)));
15549 namespace selftest
{
15551 /* Helper functions for writing tests of folding trees. */
15553 /* Verify that the binary op (LHS CODE RHS) folds to CONSTANT. */
15556 assert_binop_folds_to_const (tree lhs
, enum tree_code code
, tree rhs
,
15559 ASSERT_EQ (constant
, fold_build2 (code
, TREE_TYPE (lhs
), lhs
, rhs
));
15562 /* Verify that the binary op (LHS CODE RHS) folds to an NON_LVALUE_EXPR
15563 wrapping WRAPPED_EXPR. */
15566 assert_binop_folds_to_nonlvalue (tree lhs
, enum tree_code code
, tree rhs
,
15569 tree result
= fold_build2 (code
, TREE_TYPE (lhs
), lhs
, rhs
);
15570 ASSERT_NE (wrapped_expr
, result
);
15571 ASSERT_EQ (NON_LVALUE_EXPR
, TREE_CODE (result
));
15572 ASSERT_EQ (wrapped_expr
, TREE_OPERAND (result
, 0));
15575 /* Verify that various arithmetic binary operations are folded
15579 test_arithmetic_folding ()
15581 tree type
= integer_type_node
;
15582 tree x
= create_tmp_var_raw (type
, "x");
15583 tree zero
= build_zero_cst (type
);
15584 tree one
= build_int_cst (type
, 1);
15587 /* 1 <-- (0 + 1) */
15588 assert_binop_folds_to_const (zero
, PLUS_EXPR
, one
,
15590 assert_binop_folds_to_const (one
, PLUS_EXPR
, zero
,
15593 /* (nonlvalue)x <-- (x + 0) */
15594 assert_binop_folds_to_nonlvalue (x
, PLUS_EXPR
, zero
,
15598 /* 0 <-- (x - x) */
15599 assert_binop_folds_to_const (x
, MINUS_EXPR
, x
,
15601 assert_binop_folds_to_nonlvalue (x
, MINUS_EXPR
, zero
,
15604 /* Multiplication. */
15605 /* 0 <-- (x * 0) */
15606 assert_binop_folds_to_const (x
, MULT_EXPR
, zero
,
15609 /* (nonlvalue)x <-- (x * 1) */
15610 assert_binop_folds_to_nonlvalue (x
, MULT_EXPR
, one
,
15614 /* Verify that various binary operations on vectors are folded
15618 test_vector_folding ()
15620 tree inner_type
= integer_type_node
;
15621 tree type
= build_vector_type (inner_type
, 4);
15622 tree zero
= build_zero_cst (type
);
15623 tree one
= build_one_cst (type
);
15624 tree index
= build_index_vector (type
, 0, 1);
15626 /* Verify equality tests that return a scalar boolean result. */
15627 tree res_type
= boolean_type_node
;
15628 ASSERT_FALSE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
, zero
, one
)));
15629 ASSERT_TRUE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
, zero
, zero
)));
15630 ASSERT_TRUE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, zero
, one
)));
15631 ASSERT_FALSE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, one
, one
)));
15632 ASSERT_TRUE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, index
, one
)));
15633 ASSERT_FALSE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
,
15635 ASSERT_FALSE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
,
15637 ASSERT_TRUE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
,
15641 /* Verify folding of VEC_DUPLICATE_EXPRs. */
15644 test_vec_duplicate_folding ()
15646 scalar_int_mode int_mode
= SCALAR_INT_TYPE_MODE (ssizetype
);
15647 machine_mode vec_mode
= targetm
.vectorize
.preferred_simd_mode (int_mode
);
15648 /* This will be 1 if VEC_MODE isn't a vector mode. */
15649 poly_uint64 nunits
= GET_MODE_NUNITS (vec_mode
);
15651 tree type
= build_vector_type (ssizetype
, nunits
);
15652 tree dup5_expr
= fold_unary (VEC_DUPLICATE_EXPR
, type
, ssize_int (5));
15653 tree dup5_cst
= build_vector_from_val (type
, ssize_int (5));
15654 ASSERT_TRUE (operand_equal_p (dup5_expr
, dup5_cst
, 0));
15657 /* Run all of the selftests within this file. */
15660 fold_const_c_tests ()
15662 test_arithmetic_folding ();
15663 test_vector_folding ();
15664 test_vec_duplicate_folding ();
15667 } // namespace selftest
15669 #endif /* CHECKING_P */