1 /* Fold a constant sub-tree into a single node for C-compiler
2 Copyright (C) 1987-2017 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"
75 #include "tree-into-ssa.h"
77 #include "case-cfn-macros.h"
78 #include "stringpool.h"
80 #include "tree-ssanames.h"
83 /* Nonzero if we are folding constants inside an initializer; zero
85 int folding_initializer
= 0;
87 /* The following constants represent a bit based encoding of GCC's
88 comparison operators. This encoding simplifies transformations
89 on relational comparison operators, such as AND and OR. */
90 enum comparison_code
{
109 static bool negate_expr_p (tree
);
110 static tree
negate_expr (tree
);
111 static tree
split_tree (location_t
, tree
, tree
, enum tree_code
,
112 tree
*, tree
*, tree
*, int);
113 static tree
associate_trees (location_t
, tree
, tree
, enum tree_code
, tree
);
114 static enum comparison_code
comparison_to_compcode (enum tree_code
);
115 static enum tree_code
compcode_to_comparison (enum comparison_code
);
116 static int operand_equal_for_comparison_p (tree
, tree
, tree
);
117 static int twoval_comparison_p (tree
, tree
*, tree
*, int *);
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 int 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_div_compare (location_t
, enum tree_code
, tree
, tree
, tree
);
136 static tree
fold_negate_const (tree
, tree
);
137 static tree
fold_not_const (const_tree
, tree
);
138 static tree
fold_relational_const (enum tree_code
, tree
, tree
, tree
);
139 static tree
fold_convert_const (enum tree_code
, tree
, tree
);
140 static tree
fold_view_convert_expr (tree
, tree
);
141 static bool vec_cst_ctor_to_array (tree
, tree
*);
142 static tree
fold_negate_expr (location_t
, tree
);
145 /* Return EXPR_LOCATION of T if it is not UNKNOWN_LOCATION.
146 Otherwise, return LOC. */
149 expr_location_or (tree t
, location_t loc
)
151 location_t tloc
= EXPR_LOCATION (t
);
152 return tloc
== UNKNOWN_LOCATION
? loc
: tloc
;
155 /* Similar to protected_set_expr_location, but never modify x in place,
156 if location can and needs to be set, unshare it. */
159 protected_set_expr_location_unshare (tree x
, location_t loc
)
161 if (CAN_HAVE_LOCATION_P (x
)
162 && EXPR_LOCATION (x
) != loc
163 && !(TREE_CODE (x
) == SAVE_EXPR
164 || TREE_CODE (x
) == TARGET_EXPR
165 || TREE_CODE (x
) == BIND_EXPR
))
168 SET_EXPR_LOCATION (x
, loc
);
173 /* If ARG2 divides ARG1 with zero remainder, carries out the exact
174 division and returns the quotient. Otherwise returns
178 div_if_zero_remainder (const_tree arg1
, const_tree arg2
)
182 if (wi::multiple_of_p (wi::to_widest (arg1
), wi::to_widest (arg2
),
184 return wide_int_to_tree (TREE_TYPE (arg1
), quo
);
189 /* This is nonzero if we should defer warnings about undefined
190 overflow. This facility exists because these warnings are a
191 special case. The code to estimate loop iterations does not want
192 to issue any warnings, since it works with expressions which do not
193 occur in user code. Various bits of cleanup code call fold(), but
194 only use the result if it has certain characteristics (e.g., is a
195 constant); that code only wants to issue a warning if the result is
198 static int fold_deferring_overflow_warnings
;
200 /* If a warning about undefined overflow is deferred, this is the
201 warning. Note that this may cause us to turn two warnings into
202 one, but that is fine since it is sufficient to only give one
203 warning per expression. */
205 static const char* fold_deferred_overflow_warning
;
207 /* If a warning about undefined overflow is deferred, this is the
208 level at which the warning should be emitted. */
210 static enum warn_strict_overflow_code fold_deferred_overflow_code
;
212 /* Start deferring overflow warnings. We could use a stack here to
213 permit nested calls, but at present it is not necessary. */
216 fold_defer_overflow_warnings (void)
218 ++fold_deferring_overflow_warnings
;
221 /* Stop deferring overflow warnings. If there is a pending warning,
222 and ISSUE is true, then issue the warning if appropriate. STMT is
223 the statement with which the warning should be associated (used for
224 location information); STMT may be NULL. CODE is the level of the
225 warning--a warn_strict_overflow_code value. This function will use
226 the smaller of CODE and the deferred code when deciding whether to
227 issue the warning. CODE may be zero to mean to always use the
231 fold_undefer_overflow_warnings (bool issue
, const gimple
*stmt
, int code
)
236 gcc_assert (fold_deferring_overflow_warnings
> 0);
237 --fold_deferring_overflow_warnings
;
238 if (fold_deferring_overflow_warnings
> 0)
240 if (fold_deferred_overflow_warning
!= NULL
242 && code
< (int) fold_deferred_overflow_code
)
243 fold_deferred_overflow_code
= (enum warn_strict_overflow_code
) code
;
247 warnmsg
= fold_deferred_overflow_warning
;
248 fold_deferred_overflow_warning
= NULL
;
250 if (!issue
|| warnmsg
== NULL
)
253 if (gimple_no_warning_p (stmt
))
256 /* Use the smallest code level when deciding to issue the
258 if (code
== 0 || code
> (int) fold_deferred_overflow_code
)
259 code
= fold_deferred_overflow_code
;
261 if (!issue_strict_overflow_warning (code
))
265 locus
= input_location
;
267 locus
= gimple_location (stmt
);
268 warning_at (locus
, OPT_Wstrict_overflow
, "%s", warnmsg
);
271 /* Stop deferring overflow warnings, ignoring any deferred
275 fold_undefer_and_ignore_overflow_warnings (void)
277 fold_undefer_overflow_warnings (false, NULL
, 0);
280 /* Whether we are deferring overflow warnings. */
283 fold_deferring_overflow_warnings_p (void)
285 return fold_deferring_overflow_warnings
> 0;
288 /* This is called when we fold something based on the fact that signed
289 overflow is undefined. */
292 fold_overflow_warning (const char* gmsgid
, enum warn_strict_overflow_code wc
)
294 if (fold_deferring_overflow_warnings
> 0)
296 if (fold_deferred_overflow_warning
== NULL
297 || wc
< fold_deferred_overflow_code
)
299 fold_deferred_overflow_warning
= gmsgid
;
300 fold_deferred_overflow_code
= wc
;
303 else if (issue_strict_overflow_warning (wc
))
304 warning (OPT_Wstrict_overflow
, gmsgid
);
307 /* Return true if the built-in mathematical function specified by CODE
308 is odd, i.e. -f(x) == f(-x). */
311 negate_mathfn_p (combined_fn 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 (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_OVERFLOW_WRAPS (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 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
417 for (i
= 0; i
< count
; i
++)
418 if (!negate_expr_p (VECTOR_CST_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 || (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 && (! 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
458 && wi::popcount (wi::abs (TREE_OPERAND (t
, 0))) != 1)
459 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
460 && wi::popcount (wi::abs (TREE_OPERAND (t
, 1))) != 1)))
466 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (TREE_TYPE (t
))))
467 return negate_expr_p (TREE_OPERAND (t
, 1))
468 || negate_expr_p (TREE_OPERAND (t
, 0));
474 if (TYPE_UNSIGNED (type
))
476 if (negate_expr_p (TREE_OPERAND (t
, 0)))
478 /* In general we can't negate B in A / B, because if A is INT_MIN and
479 B is 1, we may turn this into INT_MIN / -1 which is undefined
480 and actually traps on some architectures. */
481 if (! INTEGRAL_TYPE_P (TREE_TYPE (t
))
482 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
483 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
484 && ! integer_onep (TREE_OPERAND (t
, 1))))
485 return negate_expr_p (TREE_OPERAND (t
, 1));
489 /* Negate -((double)float) as (double)(-float). */
490 if (TREE_CODE (type
) == REAL_TYPE
)
492 tree tem
= strip_float_extensions (t
);
494 return negate_expr_p (tem
);
499 /* Negate -f(x) as f(-x). */
500 if (negate_mathfn_p (get_call_combined_fn (t
)))
501 return negate_expr_p (CALL_EXPR_ARG (t
, 0));
505 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
506 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
508 tree op1
= TREE_OPERAND (t
, 1);
509 if (wi::eq_p (op1
, TYPE_PRECISION (type
) - 1))
520 /* Given T, an expression, return a folded tree for -T or NULL_TREE, if no
521 simplification is possible.
522 If negate_expr_p would return true for T, NULL_TREE will never be
526 fold_negate_expr_1 (location_t loc
, tree t
)
528 tree type
= TREE_TYPE (t
);
531 switch (TREE_CODE (t
))
533 /* Convert - (~A) to A + 1. */
535 if (INTEGRAL_TYPE_P (type
))
536 return fold_build2_loc (loc
, PLUS_EXPR
, type
, TREE_OPERAND (t
, 0),
537 build_one_cst (type
));
541 tem
= fold_negate_const (t
, type
);
542 if (TREE_OVERFLOW (tem
) == TREE_OVERFLOW (t
)
543 || (ANY_INTEGRAL_TYPE_P (type
)
544 && !TYPE_OVERFLOW_TRAPS (type
)
545 && TYPE_OVERFLOW_WRAPS (type
))
546 || (flag_sanitize
& SANITIZE_SI_OVERFLOW
) == 0)
551 tem
= fold_negate_const (t
, type
);
555 tem
= fold_negate_const (t
, type
);
560 tree rpart
= fold_negate_expr (loc
, TREE_REALPART (t
));
561 tree ipart
= fold_negate_expr (loc
, TREE_IMAGPART (t
));
563 return build_complex (type
, rpart
, ipart
);
569 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
570 tree
*elts
= XALLOCAVEC (tree
, count
);
572 for (i
= 0; i
< count
; i
++)
574 elts
[i
] = fold_negate_expr (loc
, VECTOR_CST_ELT (t
, i
));
575 if (elts
[i
] == NULL_TREE
)
579 return build_vector (type
, elts
);
583 if (negate_expr_p (t
))
584 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
585 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)),
586 fold_negate_expr (loc
, TREE_OPERAND (t
, 1)));
590 if (negate_expr_p (t
))
591 return fold_build1_loc (loc
, CONJ_EXPR
, type
,
592 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)));
596 if (!TYPE_OVERFLOW_SANITIZED (type
))
597 return TREE_OPERAND (t
, 0);
601 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
602 && !HONOR_SIGNED_ZEROS (element_mode (type
)))
604 /* -(A + B) -> (-B) - A. */
605 if (negate_expr_p (TREE_OPERAND (t
, 1)))
607 tem
= negate_expr (TREE_OPERAND (t
, 1));
608 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
609 tem
, TREE_OPERAND (t
, 0));
612 /* -(A + B) -> (-A) - B. */
613 if (negate_expr_p (TREE_OPERAND (t
, 0)))
615 tem
= negate_expr (TREE_OPERAND (t
, 0));
616 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
617 tem
, TREE_OPERAND (t
, 1));
623 /* - (A - B) -> B - A */
624 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
625 && !HONOR_SIGNED_ZEROS (element_mode (type
)))
626 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
627 TREE_OPERAND (t
, 1), TREE_OPERAND (t
, 0));
631 if (TYPE_UNSIGNED (type
))
637 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
)))
639 tem
= TREE_OPERAND (t
, 1);
640 if (negate_expr_p (tem
))
641 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
642 TREE_OPERAND (t
, 0), negate_expr (tem
));
643 tem
= TREE_OPERAND (t
, 0);
644 if (negate_expr_p (tem
))
645 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
646 negate_expr (tem
), TREE_OPERAND (t
, 1));
653 if (TYPE_UNSIGNED (type
))
655 if (negate_expr_p (TREE_OPERAND (t
, 0)))
656 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
657 negate_expr (TREE_OPERAND (t
, 0)),
658 TREE_OPERAND (t
, 1));
659 /* In general we can't negate B in A / B, because if A is INT_MIN and
660 B is 1, we may turn this into INT_MIN / -1 which is undefined
661 and actually traps on some architectures. */
662 if ((! INTEGRAL_TYPE_P (TREE_TYPE (t
))
663 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
664 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
665 && ! integer_onep (TREE_OPERAND (t
, 1))))
666 && negate_expr_p (TREE_OPERAND (t
, 1)))
667 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
669 negate_expr (TREE_OPERAND (t
, 1)));
673 /* Convert -((double)float) into (double)(-float). */
674 if (TREE_CODE (type
) == REAL_TYPE
)
676 tem
= strip_float_extensions (t
);
677 if (tem
!= t
&& negate_expr_p (tem
))
678 return fold_convert_loc (loc
, type
, negate_expr (tem
));
683 /* Negate -f(x) as f(-x). */
684 if (negate_mathfn_p (get_call_combined_fn (t
))
685 && negate_expr_p (CALL_EXPR_ARG (t
, 0)))
689 fndecl
= get_callee_fndecl (t
);
690 arg
= negate_expr (CALL_EXPR_ARG (t
, 0));
691 return build_call_expr_loc (loc
, fndecl
, 1, arg
);
696 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
697 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
699 tree op1
= TREE_OPERAND (t
, 1);
700 if (wi::eq_p (op1
, TYPE_PRECISION (type
) - 1))
702 tree ntype
= TYPE_UNSIGNED (type
)
703 ? signed_type_for (type
)
704 : unsigned_type_for (type
);
705 tree temp
= fold_convert_loc (loc
, ntype
, TREE_OPERAND (t
, 0));
706 temp
= fold_build2_loc (loc
, RSHIFT_EXPR
, ntype
, temp
, op1
);
707 return fold_convert_loc (loc
, type
, temp
);
719 /* A wrapper for fold_negate_expr_1. */
722 fold_negate_expr (location_t loc
, tree t
)
724 tree type
= TREE_TYPE (t
);
726 tree tem
= fold_negate_expr_1 (loc
, t
);
727 if (tem
== NULL_TREE
)
729 return fold_convert_loc (loc
, type
, tem
);
732 /* Like fold_negate_expr, but return a NEGATE_EXPR tree, if T can not be
733 negated in a simpler way. Also allow for T to be NULL_TREE, in which case
745 loc
= EXPR_LOCATION (t
);
746 type
= TREE_TYPE (t
);
749 tem
= fold_negate_expr (loc
, t
);
751 tem
= build1_loc (loc
, NEGATE_EXPR
, TREE_TYPE (t
), t
);
752 return fold_convert_loc (loc
, type
, tem
);
755 /* Split a tree IN into a constant, literal and variable parts that could be
756 combined with CODE to make IN. "constant" means an expression with
757 TREE_CONSTANT but that isn't an actual constant. CODE must be a
758 commutative arithmetic operation. Store the constant part into *CONP,
759 the literal in *LITP and return the variable part. If a part isn't
760 present, set it to null. If the tree does not decompose in this way,
761 return the entire tree as the variable part and the other parts as null.
763 If CODE is PLUS_EXPR we also split trees that use MINUS_EXPR. In that
764 case, we negate an operand that was subtracted. Except if it is a
765 literal for which we use *MINUS_LITP instead.
767 If NEGATE_P is true, we are negating all of IN, again except a literal
768 for which we use *MINUS_LITP instead. If a variable part is of pointer
769 type, it is negated after converting to TYPE. This prevents us from
770 generating illegal MINUS pointer expression. LOC is the location of
771 the converted variable part.
773 If IN is itself a literal or constant, return it as appropriate.
775 Note that we do not guarantee that any of the three values will be the
776 same type as IN, but they will have the same signedness and mode. */
779 split_tree (location_t loc
, tree in
, tree type
, enum tree_code code
,
780 tree
*conp
, tree
*litp
, tree
*minus_litp
, int negate_p
)
788 /* Strip any conversions that don't change the machine mode or signedness. */
789 STRIP_SIGN_NOPS (in
);
791 if (TREE_CODE (in
) == INTEGER_CST
|| TREE_CODE (in
) == REAL_CST
792 || TREE_CODE (in
) == FIXED_CST
)
794 else if (TREE_CODE (in
) == code
795 || ((! FLOAT_TYPE_P (TREE_TYPE (in
)) || flag_associative_math
)
796 && ! SAT_FIXED_POINT_TYPE_P (TREE_TYPE (in
))
797 /* We can associate addition and subtraction together (even
798 though the C standard doesn't say so) for integers because
799 the value is not affected. For reals, the value might be
800 affected, so we can't. */
801 && ((code
== PLUS_EXPR
&& TREE_CODE (in
) == POINTER_PLUS_EXPR
)
802 || (code
== PLUS_EXPR
&& TREE_CODE (in
) == MINUS_EXPR
)
803 || (code
== MINUS_EXPR
804 && (TREE_CODE (in
) == PLUS_EXPR
805 || TREE_CODE (in
) == POINTER_PLUS_EXPR
)))))
807 tree op0
= TREE_OPERAND (in
, 0);
808 tree op1
= TREE_OPERAND (in
, 1);
809 int neg1_p
= TREE_CODE (in
) == MINUS_EXPR
;
810 int neg_litp_p
= 0, neg_conp_p
= 0, neg_var_p
= 0;
812 /* First see if either of the operands is a literal, then a constant. */
813 if (TREE_CODE (op0
) == INTEGER_CST
|| TREE_CODE (op0
) == REAL_CST
814 || TREE_CODE (op0
) == FIXED_CST
)
815 *litp
= op0
, op0
= 0;
816 else if (TREE_CODE (op1
) == INTEGER_CST
|| TREE_CODE (op1
) == REAL_CST
817 || TREE_CODE (op1
) == FIXED_CST
)
818 *litp
= op1
, neg_litp_p
= neg1_p
, op1
= 0;
820 if (op0
!= 0 && TREE_CONSTANT (op0
))
821 *conp
= op0
, op0
= 0;
822 else if (op1
!= 0 && TREE_CONSTANT (op1
))
823 *conp
= op1
, neg_conp_p
= neg1_p
, op1
= 0;
825 /* If we haven't dealt with either operand, this is not a case we can
826 decompose. Otherwise, VAR is either of the ones remaining, if any. */
827 if (op0
!= 0 && op1
!= 0)
832 var
= op1
, neg_var_p
= neg1_p
;
834 /* Now do any needed negations. */
836 *minus_litp
= *litp
, *litp
= 0;
837 if (neg_conp_p
&& *conp
)
839 /* Convert to TYPE before negating. */
840 *conp
= fold_convert_loc (loc
, type
, *conp
);
841 *conp
= negate_expr (*conp
);
843 if (neg_var_p
&& var
)
845 /* Convert to TYPE before negating. */
846 var
= fold_convert_loc (loc
, type
, var
);
847 var
= negate_expr (var
);
850 else if (TREE_CONSTANT (in
))
852 else if (TREE_CODE (in
) == BIT_NOT_EXPR
853 && code
== PLUS_EXPR
)
855 /* -X - 1 is folded to ~X, undo that here. Do _not_ do this
856 when IN is constant. */
857 *minus_litp
= build_one_cst (TREE_TYPE (in
));
858 var
= negate_expr (TREE_OPERAND (in
, 0));
866 *minus_litp
= *litp
, *litp
= 0;
867 else if (*minus_litp
)
868 *litp
= *minus_litp
, *minus_litp
= 0;
871 /* Convert to TYPE before negating. */
872 *conp
= fold_convert_loc (loc
, type
, *conp
);
873 *conp
= negate_expr (*conp
);
877 /* Convert to TYPE before negating. */
878 var
= fold_convert_loc (loc
, type
, var
);
879 var
= negate_expr (var
);
886 /* Re-associate trees split by the above function. T1 and T2 are
887 either expressions to associate or null. Return the new
888 expression, if any. LOC is the location of the new expression. If
889 we build an operation, do it in TYPE and with CODE. */
892 associate_trees (location_t loc
, tree t1
, tree t2
, enum tree_code code
, tree type
)
899 /* If either input is CODE, a PLUS_EXPR, or a MINUS_EXPR, don't
900 try to fold this since we will have infinite recursion. But do
901 deal with any NEGATE_EXPRs. */
902 if (TREE_CODE (t1
) == code
|| TREE_CODE (t2
) == code
903 || TREE_CODE (t1
) == MINUS_EXPR
|| TREE_CODE (t2
) == MINUS_EXPR
)
905 if (code
== PLUS_EXPR
)
907 if (TREE_CODE (t1
) == NEGATE_EXPR
)
908 return build2_loc (loc
, MINUS_EXPR
, type
,
909 fold_convert_loc (loc
, type
, t2
),
910 fold_convert_loc (loc
, type
,
911 TREE_OPERAND (t1
, 0)));
912 else if (TREE_CODE (t2
) == NEGATE_EXPR
)
913 return build2_loc (loc
, MINUS_EXPR
, type
,
914 fold_convert_loc (loc
, type
, t1
),
915 fold_convert_loc (loc
, type
,
916 TREE_OPERAND (t2
, 0)));
917 else if (integer_zerop (t2
))
918 return fold_convert_loc (loc
, type
, t1
);
920 else if (code
== MINUS_EXPR
)
922 if (integer_zerop (t2
))
923 return fold_convert_loc (loc
, type
, t1
);
926 return build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
927 fold_convert_loc (loc
, type
, t2
));
930 return fold_build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
931 fold_convert_loc (loc
, type
, t2
));
934 /* Check whether TYPE1 and TYPE2 are equivalent integer types, suitable
935 for use in int_const_binop, size_binop and size_diffop. */
938 int_binop_types_match_p (enum tree_code code
, const_tree type1
, const_tree type2
)
940 if (!INTEGRAL_TYPE_P (type1
) && !POINTER_TYPE_P (type1
))
942 if (!INTEGRAL_TYPE_P (type2
) && !POINTER_TYPE_P (type2
))
957 return TYPE_UNSIGNED (type1
) == TYPE_UNSIGNED (type2
)
958 && TYPE_PRECISION (type1
) == TYPE_PRECISION (type2
)
959 && TYPE_MODE (type1
) == TYPE_MODE (type2
);
963 /* Combine two integer constants ARG1 and ARG2 under operation CODE
964 to produce a new constant. Return NULL_TREE if we don't know how
965 to evaluate CODE at compile-time. */
968 int_const_binop_1 (enum tree_code code
, const_tree arg1
, const_tree parg2
,
973 tree type
= TREE_TYPE (arg1
);
974 signop sign
= TYPE_SIGN (type
);
975 bool overflow
= false;
977 wide_int arg2
= wi::to_wide (parg2
, TYPE_PRECISION (type
));
982 res
= wi::bit_or (arg1
, arg2
);
986 res
= wi::bit_xor (arg1
, arg2
);
990 res
= wi::bit_and (arg1
, arg2
);
995 if (wi::neg_p (arg2
))
998 if (code
== RSHIFT_EXPR
)
1004 if (code
== RSHIFT_EXPR
)
1005 /* It's unclear from the C standard whether shifts can overflow.
1006 The following code ignores overflow; perhaps a C standard
1007 interpretation ruling is needed. */
1008 res
= wi::rshift (arg1
, arg2
, sign
);
1010 res
= wi::lshift (arg1
, arg2
);
1015 if (wi::neg_p (arg2
))
1018 if (code
== RROTATE_EXPR
)
1019 code
= LROTATE_EXPR
;
1021 code
= RROTATE_EXPR
;
1024 if (code
== RROTATE_EXPR
)
1025 res
= wi::rrotate (arg1
, arg2
);
1027 res
= wi::lrotate (arg1
, arg2
);
1031 res
= wi::add (arg1
, arg2
, sign
, &overflow
);
1035 res
= wi::sub (arg1
, arg2
, sign
, &overflow
);
1039 res
= wi::mul (arg1
, arg2
, sign
, &overflow
);
1042 case MULT_HIGHPART_EXPR
:
1043 res
= wi::mul_high (arg1
, arg2
, sign
);
1046 case TRUNC_DIV_EXPR
:
1047 case EXACT_DIV_EXPR
:
1050 res
= wi::div_trunc (arg1
, arg2
, sign
, &overflow
);
1053 case FLOOR_DIV_EXPR
:
1056 res
= wi::div_floor (arg1
, arg2
, sign
, &overflow
);
1062 res
= wi::div_ceil (arg1
, arg2
, sign
, &overflow
);
1065 case ROUND_DIV_EXPR
:
1068 res
= wi::div_round (arg1
, arg2
, sign
, &overflow
);
1071 case TRUNC_MOD_EXPR
:
1074 res
= wi::mod_trunc (arg1
, arg2
, sign
, &overflow
);
1077 case FLOOR_MOD_EXPR
:
1080 res
= wi::mod_floor (arg1
, arg2
, sign
, &overflow
);
1086 res
= wi::mod_ceil (arg1
, arg2
, sign
, &overflow
);
1089 case ROUND_MOD_EXPR
:
1092 res
= wi::mod_round (arg1
, arg2
, sign
, &overflow
);
1096 res
= wi::min (arg1
, arg2
, sign
);
1100 res
= wi::max (arg1
, arg2
, sign
);
1107 t
= force_fit_type (type
, res
, overflowable
,
1108 (((sign
== SIGNED
|| overflowable
== -1)
1110 | TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (parg2
)));
1116 int_const_binop (enum tree_code code
, const_tree arg1
, const_tree arg2
)
1118 return int_const_binop_1 (code
, arg1
, arg2
, 1);
1121 /* Combine two constants ARG1 and ARG2 under operation CODE to produce a new
1122 constant. We assume ARG1 and ARG2 have the same data type, or at least
1123 are the same kind of constant and the same machine mode. Return zero if
1124 combining the constants is not allowed in the current operating mode. */
1127 const_binop (enum tree_code code
, tree arg1
, tree arg2
)
1129 /* Sanity check for the recursive cases. */
1136 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg2
) == INTEGER_CST
)
1138 if (code
== POINTER_PLUS_EXPR
)
1139 return int_const_binop (PLUS_EXPR
,
1140 arg1
, fold_convert (TREE_TYPE (arg1
), arg2
));
1142 return int_const_binop (code
, arg1
, arg2
);
1145 if (TREE_CODE (arg1
) == REAL_CST
&& TREE_CODE (arg2
) == REAL_CST
)
1150 REAL_VALUE_TYPE value
;
1151 REAL_VALUE_TYPE result
;
1155 /* The following codes are handled by real_arithmetic. */
1170 d1
= TREE_REAL_CST (arg1
);
1171 d2
= TREE_REAL_CST (arg2
);
1173 type
= TREE_TYPE (arg1
);
1174 mode
= TYPE_MODE (type
);
1176 /* Don't perform operation if we honor signaling NaNs and
1177 either operand is a signaling NaN. */
1178 if (HONOR_SNANS (mode
)
1179 && (REAL_VALUE_ISSIGNALING_NAN (d1
)
1180 || REAL_VALUE_ISSIGNALING_NAN (d2
)))
1183 /* Don't perform operation if it would raise a division
1184 by zero exception. */
1185 if (code
== RDIV_EXPR
1186 && real_equal (&d2
, &dconst0
)
1187 && (flag_trapping_math
|| ! MODE_HAS_INFINITIES (mode
)))
1190 /* If either operand is a NaN, just return it. Otherwise, set up
1191 for floating-point trap; we return an overflow. */
1192 if (REAL_VALUE_ISNAN (d1
))
1194 /* Make resulting NaN value to be qNaN when flag_signaling_nans
1197 t
= build_real (type
, d1
);
1200 else if (REAL_VALUE_ISNAN (d2
))
1202 /* Make resulting NaN value to be qNaN when flag_signaling_nans
1205 t
= build_real (type
, d2
);
1209 inexact
= real_arithmetic (&value
, code
, &d1
, &d2
);
1210 real_convert (&result
, mode
, &value
);
1212 /* Don't constant fold this floating point operation if
1213 the result has overflowed and flag_trapping_math. */
1214 if (flag_trapping_math
1215 && MODE_HAS_INFINITIES (mode
)
1216 && REAL_VALUE_ISINF (result
)
1217 && !REAL_VALUE_ISINF (d1
)
1218 && !REAL_VALUE_ISINF (d2
))
1221 /* Don't constant fold this floating point operation if the
1222 result may dependent upon the run-time rounding mode and
1223 flag_rounding_math is set, or if GCC's software emulation
1224 is unable to accurately represent the result. */
1225 if ((flag_rounding_math
1226 || (MODE_COMPOSITE_P (mode
) && !flag_unsafe_math_optimizations
))
1227 && (inexact
|| !real_identical (&result
, &value
)))
1230 t
= build_real (type
, result
);
1232 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
);
1236 if (TREE_CODE (arg1
) == FIXED_CST
)
1238 FIXED_VALUE_TYPE f1
;
1239 FIXED_VALUE_TYPE f2
;
1240 FIXED_VALUE_TYPE result
;
1245 /* The following codes are handled by fixed_arithmetic. */
1251 case TRUNC_DIV_EXPR
:
1252 if (TREE_CODE (arg2
) != FIXED_CST
)
1254 f2
= TREE_FIXED_CST (arg2
);
1260 if (TREE_CODE (arg2
) != INTEGER_CST
)
1263 f2
.data
.high
= w2
.elt (1);
1264 f2
.data
.low
= w2
.ulow ();
1273 f1
= TREE_FIXED_CST (arg1
);
1274 type
= TREE_TYPE (arg1
);
1275 sat_p
= TYPE_SATURATING (type
);
1276 overflow_p
= fixed_arithmetic (&result
, code
, &f1
, &f2
, sat_p
);
1277 t
= build_fixed (type
, result
);
1278 /* Propagate overflow flags. */
1279 if (overflow_p
| TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
))
1280 TREE_OVERFLOW (t
) = 1;
1284 if (TREE_CODE (arg1
) == COMPLEX_CST
&& TREE_CODE (arg2
) == COMPLEX_CST
)
1286 tree type
= TREE_TYPE (arg1
);
1287 tree r1
= TREE_REALPART (arg1
);
1288 tree i1
= TREE_IMAGPART (arg1
);
1289 tree r2
= TREE_REALPART (arg2
);
1290 tree i2
= TREE_IMAGPART (arg2
);
1297 real
= const_binop (code
, r1
, r2
);
1298 imag
= const_binop (code
, i1
, i2
);
1302 if (COMPLEX_FLOAT_TYPE_P (type
))
1303 return do_mpc_arg2 (arg1
, arg2
, type
,
1304 /* do_nonfinite= */ folding_initializer
,
1307 real
= const_binop (MINUS_EXPR
,
1308 const_binop (MULT_EXPR
, r1
, r2
),
1309 const_binop (MULT_EXPR
, i1
, i2
));
1310 imag
= const_binop (PLUS_EXPR
,
1311 const_binop (MULT_EXPR
, r1
, i2
),
1312 const_binop (MULT_EXPR
, i1
, r2
));
1316 if (COMPLEX_FLOAT_TYPE_P (type
))
1317 return do_mpc_arg2 (arg1
, arg2
, type
,
1318 /* do_nonfinite= */ folding_initializer
,
1321 case TRUNC_DIV_EXPR
:
1323 case FLOOR_DIV_EXPR
:
1324 case ROUND_DIV_EXPR
:
1325 if (flag_complex_method
== 0)
1327 /* Keep this algorithm in sync with
1328 tree-complex.c:expand_complex_div_straight().
1330 Expand complex division to scalars, straightforward algorithm.
1331 a / b = ((ar*br + ai*bi)/t) + i((ai*br - ar*bi)/t)
1335 = const_binop (PLUS_EXPR
,
1336 const_binop (MULT_EXPR
, r2
, r2
),
1337 const_binop (MULT_EXPR
, i2
, i2
));
1339 = const_binop (PLUS_EXPR
,
1340 const_binop (MULT_EXPR
, r1
, r2
),
1341 const_binop (MULT_EXPR
, i1
, i2
));
1343 = const_binop (MINUS_EXPR
,
1344 const_binop (MULT_EXPR
, i1
, r2
),
1345 const_binop (MULT_EXPR
, r1
, i2
));
1347 real
= const_binop (code
, t1
, magsquared
);
1348 imag
= const_binop (code
, t2
, magsquared
);
1352 /* Keep this algorithm in sync with
1353 tree-complex.c:expand_complex_div_wide().
1355 Expand complex division to scalars, modified algorithm to minimize
1356 overflow with wide input ranges. */
1357 tree compare
= fold_build2 (LT_EXPR
, boolean_type_node
,
1358 fold_abs_const (r2
, TREE_TYPE (type
)),
1359 fold_abs_const (i2
, TREE_TYPE (type
)));
1361 if (integer_nonzerop (compare
))
1363 /* In the TRUE branch, we compute
1365 div = (br * ratio) + bi;
1366 tr = (ar * ratio) + ai;
1367 ti = (ai * ratio) - ar;
1370 tree ratio
= const_binop (code
, r2
, i2
);
1371 tree div
= const_binop (PLUS_EXPR
, i2
,
1372 const_binop (MULT_EXPR
, r2
, ratio
));
1373 real
= const_binop (MULT_EXPR
, r1
, ratio
);
1374 real
= const_binop (PLUS_EXPR
, real
, i1
);
1375 real
= const_binop (code
, real
, div
);
1377 imag
= const_binop (MULT_EXPR
, i1
, ratio
);
1378 imag
= const_binop (MINUS_EXPR
, imag
, r1
);
1379 imag
= const_binop (code
, imag
, div
);
1383 /* In the FALSE branch, we compute
1385 divisor = (d * ratio) + c;
1386 tr = (b * ratio) + a;
1387 ti = b - (a * ratio);
1390 tree ratio
= const_binop (code
, i2
, r2
);
1391 tree div
= const_binop (PLUS_EXPR
, r2
,
1392 const_binop (MULT_EXPR
, i2
, ratio
));
1394 real
= const_binop (MULT_EXPR
, i1
, ratio
);
1395 real
= const_binop (PLUS_EXPR
, real
, r1
);
1396 real
= const_binop (code
, real
, div
);
1398 imag
= const_binop (MULT_EXPR
, r1
, ratio
);
1399 imag
= const_binop (MINUS_EXPR
, i1
, imag
);
1400 imag
= const_binop (code
, imag
, div
);
1410 return build_complex (type
, real
, imag
);
1413 if (TREE_CODE (arg1
) == VECTOR_CST
1414 && TREE_CODE (arg2
) == VECTOR_CST
)
1416 tree type
= TREE_TYPE (arg1
);
1417 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
1418 tree
*elts
= XALLOCAVEC (tree
, count
);
1420 for (i
= 0; i
< count
; i
++)
1422 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1423 tree elem2
= VECTOR_CST_ELT (arg2
, i
);
1425 elts
[i
] = const_binop (code
, elem1
, elem2
);
1427 /* It is possible that const_binop cannot handle the given
1428 code and return NULL_TREE */
1429 if (elts
[i
] == NULL_TREE
)
1433 return build_vector (type
, elts
);
1436 /* Shifts allow a scalar offset for a vector. */
1437 if (TREE_CODE (arg1
) == VECTOR_CST
1438 && TREE_CODE (arg2
) == INTEGER_CST
)
1440 tree type
= TREE_TYPE (arg1
);
1441 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
1442 tree
*elts
= XALLOCAVEC (tree
, count
);
1444 for (i
= 0; i
< count
; i
++)
1446 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1448 elts
[i
] = const_binop (code
, elem1
, arg2
);
1450 /* It is possible that const_binop cannot handle the given
1451 code and return NULL_TREE. */
1452 if (elts
[i
] == NULL_TREE
)
1456 return build_vector (type
, elts
);
1461 /* Overload that adds a TYPE parameter to be able to dispatch
1462 to fold_relational_const. */
1465 const_binop (enum tree_code code
, tree type
, tree arg1
, tree arg2
)
1467 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
1468 return fold_relational_const (code
, type
, arg1
, arg2
);
1470 /* ??? Until we make the const_binop worker take the type of the
1471 result as argument put those cases that need it here. */
1475 if ((TREE_CODE (arg1
) == REAL_CST
1476 && TREE_CODE (arg2
) == REAL_CST
)
1477 || (TREE_CODE (arg1
) == INTEGER_CST
1478 && TREE_CODE (arg2
) == INTEGER_CST
))
1479 return build_complex (type
, arg1
, arg2
);
1482 case VEC_PACK_TRUNC_EXPR
:
1483 case VEC_PACK_FIX_TRUNC_EXPR
:
1485 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
1488 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)) == nelts
/ 2
1489 && TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg2
)) == nelts
/ 2);
1490 if (TREE_CODE (arg1
) != VECTOR_CST
1491 || TREE_CODE (arg2
) != VECTOR_CST
)
1494 elts
= XALLOCAVEC (tree
, nelts
);
1495 if (!vec_cst_ctor_to_array (arg1
, elts
)
1496 || !vec_cst_ctor_to_array (arg2
, elts
+ nelts
/ 2))
1499 for (i
= 0; i
< nelts
; i
++)
1501 elts
[i
] = fold_convert_const (code
== VEC_PACK_TRUNC_EXPR
1502 ? NOP_EXPR
: FIX_TRUNC_EXPR
,
1503 TREE_TYPE (type
), elts
[i
]);
1504 if (elts
[i
] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[i
]))
1508 return build_vector (type
, elts
);
1511 case VEC_WIDEN_MULT_LO_EXPR
:
1512 case VEC_WIDEN_MULT_HI_EXPR
:
1513 case VEC_WIDEN_MULT_EVEN_EXPR
:
1514 case VEC_WIDEN_MULT_ODD_EXPR
:
1516 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
);
1517 unsigned int out
, ofs
, scale
;
1520 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)) == nelts
* 2
1521 && TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg2
)) == nelts
* 2);
1522 if (TREE_CODE (arg1
) != VECTOR_CST
|| TREE_CODE (arg2
) != VECTOR_CST
)
1525 elts
= XALLOCAVEC (tree
, nelts
* 4);
1526 if (!vec_cst_ctor_to_array (arg1
, elts
)
1527 || !vec_cst_ctor_to_array (arg2
, elts
+ nelts
* 2))
1530 if (code
== VEC_WIDEN_MULT_LO_EXPR
)
1531 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? nelts
: 0;
1532 else if (code
== VEC_WIDEN_MULT_HI_EXPR
)
1533 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? 0 : nelts
;
1534 else if (code
== VEC_WIDEN_MULT_EVEN_EXPR
)
1536 else /* if (code == VEC_WIDEN_MULT_ODD_EXPR) */
1539 for (out
= 0; out
< nelts
; out
++)
1541 unsigned int in1
= (out
<< scale
) + ofs
;
1542 unsigned int in2
= in1
+ nelts
* 2;
1545 t1
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), elts
[in1
]);
1546 t2
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), elts
[in2
]);
1548 if (t1
== NULL_TREE
|| t2
== NULL_TREE
)
1550 elts
[out
] = const_binop (MULT_EXPR
, t1
, t2
);
1551 if (elts
[out
] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[out
]))
1555 return build_vector (type
, elts
);
1561 if (TREE_CODE_CLASS (code
) != tcc_binary
)
1564 /* Make sure type and arg0 have the same saturating flag. */
1565 gcc_checking_assert (TYPE_SATURATING (type
)
1566 == TYPE_SATURATING (TREE_TYPE (arg1
)));
1568 return const_binop (code
, arg1
, arg2
);
1571 /* Compute CODE ARG1 with resulting type TYPE with ARG1 being constant.
1572 Return zero if computing the constants is not possible. */
1575 const_unop (enum tree_code code
, tree type
, tree arg0
)
1577 /* Don't perform the operation, other than NEGATE and ABS, if
1578 flag_signaling_nans is on and the operand is a signaling NaN. */
1579 if (TREE_CODE (arg0
) == REAL_CST
1580 && HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0
)))
1581 && REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg0
))
1582 && code
!= NEGATE_EXPR
1583 && code
!= ABS_EXPR
)
1590 case FIX_TRUNC_EXPR
:
1591 case FIXED_CONVERT_EXPR
:
1592 return fold_convert_const (code
, type
, arg0
);
1594 case ADDR_SPACE_CONVERT_EXPR
:
1595 /* If the source address is 0, and the source address space
1596 cannot have a valid object at 0, fold to dest type null. */
1597 if (integer_zerop (arg0
)
1598 && !(targetm
.addr_space
.zero_address_valid
1599 (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg0
))))))
1600 return fold_convert_const (code
, type
, arg0
);
1603 case VIEW_CONVERT_EXPR
:
1604 return fold_view_convert_expr (type
, arg0
);
1608 /* Can't call fold_negate_const directly here as that doesn't
1609 handle all cases and we might not be able to negate some
1611 tree tem
= fold_negate_expr (UNKNOWN_LOCATION
, arg0
);
1612 if (tem
&& CONSTANT_CLASS_P (tem
))
1618 if (TREE_CODE (arg0
) == INTEGER_CST
|| TREE_CODE (arg0
) == REAL_CST
)
1619 return fold_abs_const (arg0
, type
);
1623 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1625 tree ipart
= fold_negate_const (TREE_IMAGPART (arg0
),
1627 return build_complex (type
, TREE_REALPART (arg0
), ipart
);
1632 if (TREE_CODE (arg0
) == INTEGER_CST
)
1633 return fold_not_const (arg0
, type
);
1634 /* Perform BIT_NOT_EXPR on each element individually. */
1635 else if (TREE_CODE (arg0
) == VECTOR_CST
)
1639 unsigned count
= VECTOR_CST_NELTS (arg0
), i
;
1641 elements
= XALLOCAVEC (tree
, count
);
1642 for (i
= 0; i
< count
; i
++)
1644 elem
= VECTOR_CST_ELT (arg0
, i
);
1645 elem
= const_unop (BIT_NOT_EXPR
, TREE_TYPE (type
), elem
);
1646 if (elem
== NULL_TREE
)
1651 return build_vector (type
, elements
);
1655 case TRUTH_NOT_EXPR
:
1656 if (TREE_CODE (arg0
) == INTEGER_CST
)
1657 return constant_boolean_node (integer_zerop (arg0
), type
);
1661 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1662 return fold_convert (type
, TREE_REALPART (arg0
));
1666 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1667 return fold_convert (type
, TREE_IMAGPART (arg0
));
1670 case VEC_UNPACK_LO_EXPR
:
1671 case VEC_UNPACK_HI_EXPR
:
1672 case VEC_UNPACK_FLOAT_LO_EXPR
:
1673 case VEC_UNPACK_FLOAT_HI_EXPR
:
1675 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
1677 enum tree_code subcode
;
1679 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)) == nelts
* 2);
1680 if (TREE_CODE (arg0
) != VECTOR_CST
)
1683 elts
= XALLOCAVEC (tree
, nelts
* 2);
1684 if (!vec_cst_ctor_to_array (arg0
, elts
))
1687 if ((!BYTES_BIG_ENDIAN
) ^ (code
== VEC_UNPACK_LO_EXPR
1688 || code
== VEC_UNPACK_FLOAT_LO_EXPR
))
1691 if (code
== VEC_UNPACK_LO_EXPR
|| code
== VEC_UNPACK_HI_EXPR
)
1694 subcode
= FLOAT_EXPR
;
1696 for (i
= 0; i
< nelts
; i
++)
1698 elts
[i
] = fold_convert_const (subcode
, TREE_TYPE (type
), elts
[i
]);
1699 if (elts
[i
] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[i
]))
1703 return build_vector (type
, elts
);
1706 case REDUC_MIN_EXPR
:
1707 case REDUC_MAX_EXPR
:
1708 case REDUC_PLUS_EXPR
:
1710 unsigned int nelts
, i
;
1712 enum tree_code subcode
;
1714 if (TREE_CODE (arg0
) != VECTOR_CST
)
1716 nelts
= TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
));
1718 elts
= XALLOCAVEC (tree
, nelts
);
1719 if (!vec_cst_ctor_to_array (arg0
, elts
))
1724 case REDUC_MIN_EXPR
: subcode
= MIN_EXPR
; break;
1725 case REDUC_MAX_EXPR
: subcode
= MAX_EXPR
; break;
1726 case REDUC_PLUS_EXPR
: subcode
= PLUS_EXPR
; break;
1727 default: gcc_unreachable ();
1730 for (i
= 1; i
< nelts
; i
++)
1732 elts
[0] = const_binop (subcode
, elts
[0], elts
[i
]);
1733 if (elts
[0] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[0]))
1747 /* Create a sizetype INT_CST node with NUMBER sign extended. KIND
1748 indicates which particular sizetype to create. */
1751 size_int_kind (HOST_WIDE_INT number
, enum size_type_kind kind
)
1753 return build_int_cst (sizetype_tab
[(int) kind
], number
);
1756 /* Combine operands OP1 and OP2 with arithmetic operation CODE. CODE
1757 is a tree code. The type of the result is taken from the operands.
1758 Both must be equivalent integer types, ala int_binop_types_match_p.
1759 If the operands are constant, so is the result. */
1762 size_binop_loc (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
)
1764 tree type
= TREE_TYPE (arg0
);
1766 if (arg0
== error_mark_node
|| arg1
== error_mark_node
)
1767 return error_mark_node
;
1769 gcc_assert (int_binop_types_match_p (code
, TREE_TYPE (arg0
),
1772 /* Handle the special case of two integer constants faster. */
1773 if (TREE_CODE (arg0
) == INTEGER_CST
&& TREE_CODE (arg1
) == INTEGER_CST
)
1775 /* And some specific cases even faster than that. */
1776 if (code
== PLUS_EXPR
)
1778 if (integer_zerop (arg0
) && !TREE_OVERFLOW (arg0
))
1780 if (integer_zerop (arg1
) && !TREE_OVERFLOW (arg1
))
1783 else if (code
== MINUS_EXPR
)
1785 if (integer_zerop (arg1
) && !TREE_OVERFLOW (arg1
))
1788 else if (code
== MULT_EXPR
)
1790 if (integer_onep (arg0
) && !TREE_OVERFLOW (arg0
))
1794 /* Handle general case of two integer constants. For sizetype
1795 constant calculations we always want to know about overflow,
1796 even in the unsigned case. */
1797 return int_const_binop_1 (code
, arg0
, arg1
, -1);
1800 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
1803 /* Given two values, either both of sizetype or both of bitsizetype,
1804 compute the difference between the two values. Return the value
1805 in signed type corresponding to the type of the operands. */
1808 size_diffop_loc (location_t loc
, tree arg0
, tree arg1
)
1810 tree type
= TREE_TYPE (arg0
);
1813 gcc_assert (int_binop_types_match_p (MINUS_EXPR
, TREE_TYPE (arg0
),
1816 /* If the type is already signed, just do the simple thing. */
1817 if (!TYPE_UNSIGNED (type
))
1818 return size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
);
1820 if (type
== sizetype
)
1822 else if (type
== bitsizetype
)
1823 ctype
= sbitsizetype
;
1825 ctype
= signed_type_for (type
);
1827 /* If either operand is not a constant, do the conversions to the signed
1828 type and subtract. The hardware will do the right thing with any
1829 overflow in the subtraction. */
1830 if (TREE_CODE (arg0
) != INTEGER_CST
|| TREE_CODE (arg1
) != INTEGER_CST
)
1831 return size_binop_loc (loc
, MINUS_EXPR
,
1832 fold_convert_loc (loc
, ctype
, arg0
),
1833 fold_convert_loc (loc
, ctype
, arg1
));
1835 /* If ARG0 is larger than ARG1, subtract and return the result in CTYPE.
1836 Otherwise, subtract the other way, convert to CTYPE (we know that can't
1837 overflow) and negate (which can't either). Special-case a result
1838 of zero while we're here. */
1839 if (tree_int_cst_equal (arg0
, arg1
))
1840 return build_int_cst (ctype
, 0);
1841 else if (tree_int_cst_lt (arg1
, arg0
))
1842 return fold_convert_loc (loc
, ctype
,
1843 size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
));
1845 return size_binop_loc (loc
, MINUS_EXPR
, build_int_cst (ctype
, 0),
1846 fold_convert_loc (loc
, ctype
,
1847 size_binop_loc (loc
,
1852 /* A subroutine of fold_convert_const handling conversions of an
1853 INTEGER_CST to another integer type. */
1856 fold_convert_const_int_from_int (tree type
, const_tree arg1
)
1858 /* Given an integer constant, make new constant with new type,
1859 appropriately sign-extended or truncated. Use widest_int
1860 so that any extension is done according ARG1's type. */
1861 return force_fit_type (type
, wi::to_widest (arg1
),
1862 !POINTER_TYPE_P (TREE_TYPE (arg1
)),
1863 TREE_OVERFLOW (arg1
));
1866 /* A subroutine of fold_convert_const handling conversions a REAL_CST
1867 to an integer type. */
1870 fold_convert_const_int_from_real (enum tree_code code
, tree type
, const_tree arg1
)
1872 bool overflow
= false;
1875 /* The following code implements the floating point to integer
1876 conversion rules required by the Java Language Specification,
1877 that IEEE NaNs are mapped to zero and values that overflow
1878 the target precision saturate, i.e. values greater than
1879 INT_MAX are mapped to INT_MAX, and values less than INT_MIN
1880 are mapped to INT_MIN. These semantics are allowed by the
1881 C and C++ standards that simply state that the behavior of
1882 FP-to-integer conversion is unspecified upon overflow. */
1886 REAL_VALUE_TYPE x
= TREE_REAL_CST (arg1
);
1890 case FIX_TRUNC_EXPR
:
1891 real_trunc (&r
, VOIDmode
, &x
);
1898 /* If R is NaN, return zero and show we have an overflow. */
1899 if (REAL_VALUE_ISNAN (r
))
1902 val
= wi::zero (TYPE_PRECISION (type
));
1905 /* See if R is less than the lower bound or greater than the
1910 tree lt
= TYPE_MIN_VALUE (type
);
1911 REAL_VALUE_TYPE l
= real_value_from_int_cst (NULL_TREE
, lt
);
1912 if (real_less (&r
, &l
))
1921 tree ut
= TYPE_MAX_VALUE (type
);
1924 REAL_VALUE_TYPE u
= real_value_from_int_cst (NULL_TREE
, ut
);
1925 if (real_less (&u
, &r
))
1934 val
= real_to_integer (&r
, &overflow
, TYPE_PRECISION (type
));
1936 t
= force_fit_type (type
, val
, -1, overflow
| TREE_OVERFLOW (arg1
));
1940 /* A subroutine of fold_convert_const handling conversions of a
1941 FIXED_CST to an integer type. */
1944 fold_convert_const_int_from_fixed (tree type
, const_tree arg1
)
1947 double_int temp
, temp_trunc
;
1950 /* Right shift FIXED_CST to temp by fbit. */
1951 temp
= TREE_FIXED_CST (arg1
).data
;
1952 mode
= TREE_FIXED_CST (arg1
).mode
;
1953 if (GET_MODE_FBIT (mode
) < HOST_BITS_PER_DOUBLE_INT
)
1955 temp
= temp
.rshift (GET_MODE_FBIT (mode
),
1956 HOST_BITS_PER_DOUBLE_INT
,
1957 SIGNED_FIXED_POINT_MODE_P (mode
));
1959 /* Left shift temp to temp_trunc by fbit. */
1960 temp_trunc
= temp
.lshift (GET_MODE_FBIT (mode
),
1961 HOST_BITS_PER_DOUBLE_INT
,
1962 SIGNED_FIXED_POINT_MODE_P (mode
));
1966 temp
= double_int_zero
;
1967 temp_trunc
= double_int_zero
;
1970 /* If FIXED_CST is negative, we need to round the value toward 0.
1971 By checking if the fractional bits are not zero to add 1 to temp. */
1972 if (SIGNED_FIXED_POINT_MODE_P (mode
)
1973 && temp_trunc
.is_negative ()
1974 && TREE_FIXED_CST (arg1
).data
!= temp_trunc
)
1975 temp
+= double_int_one
;
1977 /* Given a fixed-point constant, make new constant with new type,
1978 appropriately sign-extended or truncated. */
1979 t
= force_fit_type (type
, temp
, -1,
1980 (temp
.is_negative ()
1981 && (TYPE_UNSIGNED (type
)
1982 < TYPE_UNSIGNED (TREE_TYPE (arg1
))))
1983 | TREE_OVERFLOW (arg1
));
1988 /* A subroutine of fold_convert_const handling conversions a REAL_CST
1989 to another floating point type. */
1992 fold_convert_const_real_from_real (tree type
, const_tree arg1
)
1994 REAL_VALUE_TYPE value
;
1997 /* Don't perform the operation if flag_signaling_nans is on
1998 and the operand is a signaling NaN. */
1999 if (HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg1
)))
2000 && REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg1
)))
2003 real_convert (&value
, TYPE_MODE (type
), &TREE_REAL_CST (arg1
));
2004 t
= build_real (type
, value
);
2006 /* If converting an infinity or NAN to a representation that doesn't
2007 have one, set the overflow bit so that we can produce some kind of
2008 error message at the appropriate point if necessary. It's not the
2009 most user-friendly message, but it's better than nothing. */
2010 if (REAL_VALUE_ISINF (TREE_REAL_CST (arg1
))
2011 && !MODE_HAS_INFINITIES (TYPE_MODE (type
)))
2012 TREE_OVERFLOW (t
) = 1;
2013 else if (REAL_VALUE_ISNAN (TREE_REAL_CST (arg1
))
2014 && !MODE_HAS_NANS (TYPE_MODE (type
)))
2015 TREE_OVERFLOW (t
) = 1;
2016 /* Regular overflow, conversion produced an infinity in a mode that
2017 can't represent them. */
2018 else if (!MODE_HAS_INFINITIES (TYPE_MODE (type
))
2019 && REAL_VALUE_ISINF (value
)
2020 && !REAL_VALUE_ISINF (TREE_REAL_CST (arg1
)))
2021 TREE_OVERFLOW (t
) = 1;
2023 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
2027 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
2028 to a floating point type. */
2031 fold_convert_const_real_from_fixed (tree type
, const_tree arg1
)
2033 REAL_VALUE_TYPE value
;
2036 real_convert_from_fixed (&value
, TYPE_MODE (type
), &TREE_FIXED_CST (arg1
));
2037 t
= build_real (type
, value
);
2039 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
2043 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
2044 to another fixed-point type. */
2047 fold_convert_const_fixed_from_fixed (tree type
, const_tree arg1
)
2049 FIXED_VALUE_TYPE value
;
2053 overflow_p
= fixed_convert (&value
, TYPE_MODE (type
), &TREE_FIXED_CST (arg1
),
2054 TYPE_SATURATING (type
));
2055 t
= build_fixed (type
, value
);
2057 /* Propagate overflow flags. */
2058 if (overflow_p
| TREE_OVERFLOW (arg1
))
2059 TREE_OVERFLOW (t
) = 1;
2063 /* A subroutine of fold_convert_const handling conversions an INTEGER_CST
2064 to a fixed-point type. */
2067 fold_convert_const_fixed_from_int (tree type
, const_tree arg1
)
2069 FIXED_VALUE_TYPE value
;
2074 gcc_assert (TREE_INT_CST_NUNITS (arg1
) <= 2);
2076 di
.low
= TREE_INT_CST_ELT (arg1
, 0);
2077 if (TREE_INT_CST_NUNITS (arg1
) == 1)
2078 di
.high
= (HOST_WIDE_INT
) di
.low
< 0 ? HOST_WIDE_INT_M1
: 0;
2080 di
.high
= TREE_INT_CST_ELT (arg1
, 1);
2082 overflow_p
= fixed_convert_from_int (&value
, TYPE_MODE (type
), di
,
2083 TYPE_UNSIGNED (TREE_TYPE (arg1
)),
2084 TYPE_SATURATING (type
));
2085 t
= build_fixed (type
, value
);
2087 /* Propagate overflow flags. */
2088 if (overflow_p
| TREE_OVERFLOW (arg1
))
2089 TREE_OVERFLOW (t
) = 1;
2093 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2094 to a fixed-point type. */
2097 fold_convert_const_fixed_from_real (tree type
, const_tree arg1
)
2099 FIXED_VALUE_TYPE value
;
2103 overflow_p
= fixed_convert_from_real (&value
, TYPE_MODE (type
),
2104 &TREE_REAL_CST (arg1
),
2105 TYPE_SATURATING (type
));
2106 t
= build_fixed (type
, value
);
2108 /* Propagate overflow flags. */
2109 if (overflow_p
| TREE_OVERFLOW (arg1
))
2110 TREE_OVERFLOW (t
) = 1;
2114 /* Attempt to fold type conversion operation CODE of expression ARG1 to
2115 type TYPE. If no simplification can be done return NULL_TREE. */
2118 fold_convert_const (enum tree_code code
, tree type
, tree arg1
)
2120 if (TREE_TYPE (arg1
) == type
)
2123 if (POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
)
2124 || TREE_CODE (type
) == OFFSET_TYPE
)
2126 if (TREE_CODE (arg1
) == INTEGER_CST
)
2127 return fold_convert_const_int_from_int (type
, arg1
);
2128 else if (TREE_CODE (arg1
) == REAL_CST
)
2129 return fold_convert_const_int_from_real (code
, type
, arg1
);
2130 else if (TREE_CODE (arg1
) == FIXED_CST
)
2131 return fold_convert_const_int_from_fixed (type
, arg1
);
2133 else if (TREE_CODE (type
) == REAL_TYPE
)
2135 if (TREE_CODE (arg1
) == INTEGER_CST
)
2136 return build_real_from_int_cst (type
, arg1
);
2137 else if (TREE_CODE (arg1
) == REAL_CST
)
2138 return fold_convert_const_real_from_real (type
, arg1
);
2139 else if (TREE_CODE (arg1
) == FIXED_CST
)
2140 return fold_convert_const_real_from_fixed (type
, arg1
);
2142 else if (TREE_CODE (type
) == FIXED_POINT_TYPE
)
2144 if (TREE_CODE (arg1
) == FIXED_CST
)
2145 return fold_convert_const_fixed_from_fixed (type
, arg1
);
2146 else if (TREE_CODE (arg1
) == INTEGER_CST
)
2147 return fold_convert_const_fixed_from_int (type
, arg1
);
2148 else if (TREE_CODE (arg1
) == REAL_CST
)
2149 return fold_convert_const_fixed_from_real (type
, arg1
);
2151 else if (TREE_CODE (type
) == VECTOR_TYPE
)
2153 if (TREE_CODE (arg1
) == VECTOR_CST
2154 && TYPE_VECTOR_SUBPARTS (type
) == VECTOR_CST_NELTS (arg1
))
2156 int len
= TYPE_VECTOR_SUBPARTS (type
);
2157 tree elttype
= TREE_TYPE (type
);
2158 tree
*v
= XALLOCAVEC (tree
, len
);
2159 for (int i
= 0; i
< len
; ++i
)
2161 tree elt
= VECTOR_CST_ELT (arg1
, i
);
2162 tree cvt
= fold_convert_const (code
, elttype
, elt
);
2163 if (cvt
== NULL_TREE
)
2167 return build_vector (type
, v
);
2173 /* Construct a vector of zero elements of vector type TYPE. */
2176 build_zero_vector (tree type
)
2180 t
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), integer_zero_node
);
2181 return build_vector_from_val (type
, t
);
2184 /* Returns true, if ARG is convertible to TYPE using a NOP_EXPR. */
2187 fold_convertible_p (const_tree type
, const_tree arg
)
2189 tree orig
= TREE_TYPE (arg
);
2194 if (TREE_CODE (arg
) == ERROR_MARK
2195 || TREE_CODE (type
) == ERROR_MARK
2196 || TREE_CODE (orig
) == ERROR_MARK
)
2199 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2202 switch (TREE_CODE (type
))
2204 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2205 case POINTER_TYPE
: case REFERENCE_TYPE
:
2207 return (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2208 || TREE_CODE (orig
) == OFFSET_TYPE
);
2211 case FIXED_POINT_TYPE
:
2214 return TREE_CODE (type
) == TREE_CODE (orig
);
2221 /* Convert expression ARG to type TYPE. Used by the middle-end for
2222 simple conversions in preference to calling the front-end's convert. */
2225 fold_convert_loc (location_t loc
, tree type
, tree arg
)
2227 tree orig
= TREE_TYPE (arg
);
2233 if (TREE_CODE (arg
) == ERROR_MARK
2234 || TREE_CODE (type
) == ERROR_MARK
2235 || TREE_CODE (orig
) == ERROR_MARK
)
2236 return error_mark_node
;
2238 switch (TREE_CODE (type
))
2241 case REFERENCE_TYPE
:
2242 /* Handle conversions between pointers to different address spaces. */
2243 if (POINTER_TYPE_P (orig
)
2244 && (TYPE_ADDR_SPACE (TREE_TYPE (type
))
2245 != TYPE_ADDR_SPACE (TREE_TYPE (orig
))))
2246 return fold_build1_loc (loc
, ADDR_SPACE_CONVERT_EXPR
, type
, arg
);
2249 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2251 if (TREE_CODE (arg
) == INTEGER_CST
)
2253 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2254 if (tem
!= NULL_TREE
)
2257 if (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2258 || TREE_CODE (orig
) == OFFSET_TYPE
)
2259 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2260 if (TREE_CODE (orig
) == COMPLEX_TYPE
)
2261 return fold_convert_loc (loc
, type
,
2262 fold_build1_loc (loc
, REALPART_EXPR
,
2263 TREE_TYPE (orig
), arg
));
2264 gcc_assert (TREE_CODE (orig
) == VECTOR_TYPE
2265 && tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2266 return fold_build1_loc (loc
, VIEW_CONVERT_EXPR
, type
, arg
);
2269 if (TREE_CODE (arg
) == INTEGER_CST
)
2271 tem
= fold_convert_const (FLOAT_EXPR
, type
, arg
);
2272 if (tem
!= NULL_TREE
)
2275 else if (TREE_CODE (arg
) == REAL_CST
)
2277 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2278 if (tem
!= NULL_TREE
)
2281 else if (TREE_CODE (arg
) == FIXED_CST
)
2283 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2284 if (tem
!= NULL_TREE
)
2288 switch (TREE_CODE (orig
))
2291 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2292 case POINTER_TYPE
: case REFERENCE_TYPE
:
2293 return fold_build1_loc (loc
, FLOAT_EXPR
, type
, arg
);
2296 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2298 case FIXED_POINT_TYPE
:
2299 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2302 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2303 return fold_convert_loc (loc
, type
, tem
);
2309 case FIXED_POINT_TYPE
:
2310 if (TREE_CODE (arg
) == FIXED_CST
|| TREE_CODE (arg
) == INTEGER_CST
2311 || TREE_CODE (arg
) == REAL_CST
)
2313 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2314 if (tem
!= NULL_TREE
)
2315 goto fold_convert_exit
;
2318 switch (TREE_CODE (orig
))
2320 case FIXED_POINT_TYPE
:
2325 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2328 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2329 return fold_convert_loc (loc
, type
, tem
);
2336 switch (TREE_CODE (orig
))
2339 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2340 case POINTER_TYPE
: case REFERENCE_TYPE
:
2342 case FIXED_POINT_TYPE
:
2343 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
2344 fold_convert_loc (loc
, TREE_TYPE (type
), arg
),
2345 fold_convert_loc (loc
, TREE_TYPE (type
),
2346 integer_zero_node
));
2351 if (TREE_CODE (arg
) == COMPLEX_EXPR
)
2353 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2354 TREE_OPERAND (arg
, 0));
2355 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2356 TREE_OPERAND (arg
, 1));
2357 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2360 arg
= save_expr (arg
);
2361 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2362 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, TREE_TYPE (orig
), arg
);
2363 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
), rpart
);
2364 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
), ipart
);
2365 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2373 if (integer_zerop (arg
))
2374 return build_zero_vector (type
);
2375 gcc_assert (tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2376 gcc_assert (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2377 || TREE_CODE (orig
) == VECTOR_TYPE
);
2378 return fold_build1_loc (loc
, VIEW_CONVERT_EXPR
, type
, arg
);
2381 tem
= fold_ignored_result (arg
);
2382 return fold_build1_loc (loc
, NOP_EXPR
, type
, tem
);
2385 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2386 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2390 protected_set_expr_location_unshare (tem
, loc
);
2394 /* Return false if expr can be assumed not to be an lvalue, true
2398 maybe_lvalue_p (const_tree x
)
2400 /* We only need to wrap lvalue tree codes. */
2401 switch (TREE_CODE (x
))
2414 case ARRAY_RANGE_REF
:
2420 case PREINCREMENT_EXPR
:
2421 case PREDECREMENT_EXPR
:
2423 case TRY_CATCH_EXPR
:
2424 case WITH_CLEANUP_EXPR
:
2433 /* Assume the worst for front-end tree codes. */
2434 if ((int)TREE_CODE (x
) >= NUM_TREE_CODES
)
2442 /* Return an expr equal to X but certainly not valid as an lvalue. */
2445 non_lvalue_loc (location_t loc
, tree x
)
2447 /* While we are in GIMPLE, NON_LVALUE_EXPR doesn't mean anything to
2452 if (! maybe_lvalue_p (x
))
2454 return build1_loc (loc
, NON_LVALUE_EXPR
, TREE_TYPE (x
), x
);
2457 /* When pedantic, return an expr equal to X but certainly not valid as a
2458 pedantic lvalue. Otherwise, return X. */
2461 pedantic_non_lvalue_loc (location_t loc
, tree x
)
2463 return protected_set_expr_location_unshare (x
, loc
);
2466 /* Given a tree comparison code, return the code that is the logical inverse.
2467 It is generally not safe to do this for floating-point comparisons, except
2468 for EQ_EXPR, NE_EXPR, ORDERED_EXPR and UNORDERED_EXPR, so we return
2469 ERROR_MARK in this case. */
2472 invert_tree_comparison (enum tree_code code
, bool honor_nans
)
2474 if (honor_nans
&& flag_trapping_math
&& code
!= EQ_EXPR
&& code
!= NE_EXPR
2475 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
)
2485 return honor_nans
? UNLE_EXPR
: LE_EXPR
;
2487 return honor_nans
? UNLT_EXPR
: LT_EXPR
;
2489 return honor_nans
? UNGE_EXPR
: GE_EXPR
;
2491 return honor_nans
? UNGT_EXPR
: GT_EXPR
;
2505 return UNORDERED_EXPR
;
2506 case UNORDERED_EXPR
:
2507 return ORDERED_EXPR
;
2513 /* Similar, but return the comparison that results if the operands are
2514 swapped. This is safe for floating-point. */
2517 swap_tree_comparison (enum tree_code code
)
2524 case UNORDERED_EXPR
:
2550 /* Convert a comparison tree code from an enum tree_code representation
2551 into a compcode bit-based encoding. This function is the inverse of
2552 compcode_to_comparison. */
2554 static enum comparison_code
2555 comparison_to_compcode (enum tree_code code
)
2572 return COMPCODE_ORD
;
2573 case UNORDERED_EXPR
:
2574 return COMPCODE_UNORD
;
2576 return COMPCODE_UNLT
;
2578 return COMPCODE_UNEQ
;
2580 return COMPCODE_UNLE
;
2582 return COMPCODE_UNGT
;
2584 return COMPCODE_LTGT
;
2586 return COMPCODE_UNGE
;
2592 /* Convert a compcode bit-based encoding of a comparison operator back
2593 to GCC's enum tree_code representation. This function is the
2594 inverse of comparison_to_compcode. */
2596 static enum tree_code
2597 compcode_to_comparison (enum comparison_code code
)
2614 return ORDERED_EXPR
;
2615 case COMPCODE_UNORD
:
2616 return UNORDERED_EXPR
;
2634 /* Return a tree for the comparison which is the combination of
2635 doing the AND or OR (depending on CODE) of the two operations LCODE
2636 and RCODE on the identical operands LL_ARG and LR_ARG. Take into account
2637 the possibility of trapping if the mode has NaNs, and return NULL_TREE
2638 if this makes the transformation invalid. */
2641 combine_comparisons (location_t loc
,
2642 enum tree_code code
, enum tree_code lcode
,
2643 enum tree_code rcode
, tree truth_type
,
2644 tree ll_arg
, tree lr_arg
)
2646 bool honor_nans
= HONOR_NANS (ll_arg
);
2647 enum comparison_code lcompcode
= comparison_to_compcode (lcode
);
2648 enum comparison_code rcompcode
= comparison_to_compcode (rcode
);
2653 case TRUTH_AND_EXPR
: case TRUTH_ANDIF_EXPR
:
2654 compcode
= lcompcode
& rcompcode
;
2657 case TRUTH_OR_EXPR
: case TRUTH_ORIF_EXPR
:
2658 compcode
= lcompcode
| rcompcode
;
2667 /* Eliminate unordered comparisons, as well as LTGT and ORD
2668 which are not used unless the mode has NaNs. */
2669 compcode
&= ~COMPCODE_UNORD
;
2670 if (compcode
== COMPCODE_LTGT
)
2671 compcode
= COMPCODE_NE
;
2672 else if (compcode
== COMPCODE_ORD
)
2673 compcode
= COMPCODE_TRUE
;
2675 else if (flag_trapping_math
)
2677 /* Check that the original operation and the optimized ones will trap
2678 under the same condition. */
2679 bool ltrap
= (lcompcode
& COMPCODE_UNORD
) == 0
2680 && (lcompcode
!= COMPCODE_EQ
)
2681 && (lcompcode
!= COMPCODE_ORD
);
2682 bool rtrap
= (rcompcode
& COMPCODE_UNORD
) == 0
2683 && (rcompcode
!= COMPCODE_EQ
)
2684 && (rcompcode
!= COMPCODE_ORD
);
2685 bool trap
= (compcode
& COMPCODE_UNORD
) == 0
2686 && (compcode
!= COMPCODE_EQ
)
2687 && (compcode
!= COMPCODE_ORD
);
2689 /* In a short-circuited boolean expression the LHS might be
2690 such that the RHS, if evaluated, will never trap. For
2691 example, in ORD (x, y) && (x < y), we evaluate the RHS only
2692 if neither x nor y is NaN. (This is a mixed blessing: for
2693 example, the expression above will never trap, hence
2694 optimizing it to x < y would be invalid). */
2695 if ((code
== TRUTH_ORIF_EXPR
&& (lcompcode
& COMPCODE_UNORD
))
2696 || (code
== TRUTH_ANDIF_EXPR
&& !(lcompcode
& COMPCODE_UNORD
)))
2699 /* If the comparison was short-circuited, and only the RHS
2700 trapped, we may now generate a spurious trap. */
2702 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
2705 /* If we changed the conditions that cause a trap, we lose. */
2706 if ((ltrap
|| rtrap
) != trap
)
2710 if (compcode
== COMPCODE_TRUE
)
2711 return constant_boolean_node (true, truth_type
);
2712 else if (compcode
== COMPCODE_FALSE
)
2713 return constant_boolean_node (false, truth_type
);
2716 enum tree_code tcode
;
2718 tcode
= compcode_to_comparison ((enum comparison_code
) compcode
);
2719 return fold_build2_loc (loc
, tcode
, truth_type
, ll_arg
, lr_arg
);
2723 /* Return nonzero if two operands (typically of the same tree node)
2724 are necessarily equal. FLAGS modifies behavior as follows:
2726 If OEP_ONLY_CONST is set, only return nonzero for constants.
2727 This function tests whether the operands are indistinguishable;
2728 it does not test whether they are equal using C's == operation.
2729 The distinction is important for IEEE floating point, because
2730 (1) -0.0 and 0.0 are distinguishable, but -0.0==0.0, and
2731 (2) two NaNs may be indistinguishable, but NaN!=NaN.
2733 If OEP_ONLY_CONST is unset, a VAR_DECL is considered equal to itself
2734 even though it may hold multiple values during a function.
2735 This is because a GCC tree node guarantees that nothing else is
2736 executed between the evaluation of its "operands" (which may often
2737 be evaluated in arbitrary order). Hence if the operands themselves
2738 don't side-effect, the VAR_DECLs, PARM_DECLs etc... must hold the
2739 same value in each operand/subexpression. Hence leaving OEP_ONLY_CONST
2740 unset means assuming isochronic (or instantaneous) tree equivalence.
2741 Unless comparing arbitrary expression trees, such as from different
2742 statements, this flag can usually be left unset.
2744 If OEP_PURE_SAME is set, then pure functions with identical arguments
2745 are considered the same. It is used when the caller has other ways
2746 to ensure that global memory is unchanged in between.
2748 If OEP_ADDRESS_OF is set, we are actually comparing addresses of objects,
2749 not values of expressions.
2751 If OEP_LEXICOGRAPHIC is set, then also handle expressions with side-effects
2752 such as MODIFY_EXPR, RETURN_EXPR, as well as STATEMENT_LISTs.
2754 Unless OEP_MATCH_SIDE_EFFECTS is set, the function returns false on
2755 any operand with side effect. This is unnecesarily conservative in the
2756 case we know that arg0 and arg1 are in disjoint code paths (such as in
2757 ?: operator). In addition OEP_MATCH_SIDE_EFFECTS is used when comparing
2758 addresses with TREE_CONSTANT flag set so we know that &var == &var
2759 even if var is volatile. */
2762 operand_equal_p (const_tree arg0
, const_tree arg1
, unsigned int flags
)
2764 /* When checking, verify at the outermost operand_equal_p call that
2765 if operand_equal_p returns non-zero then ARG0 and ARG1 has the same
2767 if (flag_checking
&& !(flags
& OEP_NO_HASH_CHECK
))
2769 if (operand_equal_p (arg0
, arg1
, flags
| OEP_NO_HASH_CHECK
))
2773 inchash::hash
hstate0 (0), hstate1 (0);
2774 inchash::add_expr (arg0
, hstate0
, flags
| OEP_HASH_CHECK
);
2775 inchash::add_expr (arg1
, hstate1
, flags
| OEP_HASH_CHECK
);
2776 hashval_t h0
= hstate0
.end ();
2777 hashval_t h1
= hstate1
.end ();
2778 gcc_assert (h0
== h1
);
2786 /* If either is ERROR_MARK, they aren't equal. */
2787 if (TREE_CODE (arg0
) == ERROR_MARK
|| TREE_CODE (arg1
) == ERROR_MARK
2788 || TREE_TYPE (arg0
) == error_mark_node
2789 || TREE_TYPE (arg1
) == error_mark_node
)
2792 /* Similar, if either does not have a type (like a released SSA name),
2793 they aren't equal. */
2794 if (!TREE_TYPE (arg0
) || !TREE_TYPE (arg1
))
2797 /* We cannot consider pointers to different address space equal. */
2798 if (POINTER_TYPE_P (TREE_TYPE (arg0
))
2799 && POINTER_TYPE_P (TREE_TYPE (arg1
))
2800 && (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg0
)))
2801 != TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg1
)))))
2804 /* Check equality of integer constants before bailing out due to
2805 precision differences. */
2806 if (TREE_CODE (arg0
) == INTEGER_CST
&& TREE_CODE (arg1
) == INTEGER_CST
)
2808 /* Address of INTEGER_CST is not defined; check that we did not forget
2809 to drop the OEP_ADDRESS_OF flags. */
2810 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
2811 return tree_int_cst_equal (arg0
, arg1
);
2814 if (!(flags
& OEP_ADDRESS_OF
))
2816 /* If both types don't have the same signedness, then we can't consider
2817 them equal. We must check this before the STRIP_NOPS calls
2818 because they may change the signedness of the arguments. As pointers
2819 strictly don't have a signedness, require either two pointers or
2820 two non-pointers as well. */
2821 if (TYPE_UNSIGNED (TREE_TYPE (arg0
)) != TYPE_UNSIGNED (TREE_TYPE (arg1
))
2822 || POINTER_TYPE_P (TREE_TYPE (arg0
))
2823 != POINTER_TYPE_P (TREE_TYPE (arg1
)))
2826 /* If both types don't have the same precision, then it is not safe
2828 if (element_precision (TREE_TYPE (arg0
))
2829 != element_precision (TREE_TYPE (arg1
)))
2836 /* FIXME: Fortran FE currently produce ADDR_EXPR of NOP_EXPR. Enable the
2837 sanity check once the issue is solved. */
2839 /* Addresses of conversions and SSA_NAMEs (and many other things)
2840 are not defined. Check that we did not forget to drop the
2841 OEP_ADDRESS_OF/OEP_CONSTANT_ADDRESS_OF flags. */
2842 gcc_checking_assert (!CONVERT_EXPR_P (arg0
) && !CONVERT_EXPR_P (arg1
)
2843 && TREE_CODE (arg0
) != SSA_NAME
);
2846 /* In case both args are comparisons but with different comparison
2847 code, try to swap the comparison operands of one arg to produce
2848 a match and compare that variant. */
2849 if (TREE_CODE (arg0
) != TREE_CODE (arg1
)
2850 && COMPARISON_CLASS_P (arg0
)
2851 && COMPARISON_CLASS_P (arg1
))
2853 enum tree_code swap_code
= swap_tree_comparison (TREE_CODE (arg1
));
2855 if (TREE_CODE (arg0
) == swap_code
)
2856 return operand_equal_p (TREE_OPERAND (arg0
, 0),
2857 TREE_OPERAND (arg1
, 1), flags
)
2858 && operand_equal_p (TREE_OPERAND (arg0
, 1),
2859 TREE_OPERAND (arg1
, 0), flags
);
2862 if (TREE_CODE (arg0
) != TREE_CODE (arg1
))
2864 /* NOP_EXPR and CONVERT_EXPR are considered equal. */
2865 if (CONVERT_EXPR_P (arg0
) && CONVERT_EXPR_P (arg1
))
2867 else if (flags
& OEP_ADDRESS_OF
)
2869 /* If we are interested in comparing addresses ignore
2870 MEM_REF wrappings of the base that can appear just for
2872 if (TREE_CODE (arg0
) == MEM_REF
2874 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == ADDR_EXPR
2875 && TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0) == arg1
2876 && integer_zerop (TREE_OPERAND (arg0
, 1)))
2878 else if (TREE_CODE (arg1
) == MEM_REF
2880 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == ADDR_EXPR
2881 && TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0) == arg0
2882 && integer_zerop (TREE_OPERAND (arg1
, 1)))
2890 /* When not checking adddresses, this is needed for conversions and for
2891 COMPONENT_REF. Might as well play it safe and always test this. */
2892 if (TREE_CODE (TREE_TYPE (arg0
)) == ERROR_MARK
2893 || TREE_CODE (TREE_TYPE (arg1
)) == ERROR_MARK
2894 || (TYPE_MODE (TREE_TYPE (arg0
)) != TYPE_MODE (TREE_TYPE (arg1
))
2895 && !(flags
& OEP_ADDRESS_OF
)))
2898 /* If ARG0 and ARG1 are the same SAVE_EXPR, they are necessarily equal.
2899 We don't care about side effects in that case because the SAVE_EXPR
2900 takes care of that for us. In all other cases, two expressions are
2901 equal if they have no side effects. If we have two identical
2902 expressions with side effects that should be treated the same due
2903 to the only side effects being identical SAVE_EXPR's, that will
2904 be detected in the recursive calls below.
2905 If we are taking an invariant address of two identical objects
2906 they are necessarily equal as well. */
2907 if (arg0
== arg1
&& ! (flags
& OEP_ONLY_CONST
)
2908 && (TREE_CODE (arg0
) == SAVE_EXPR
2909 || (flags
& OEP_MATCH_SIDE_EFFECTS
)
2910 || (! TREE_SIDE_EFFECTS (arg0
) && ! TREE_SIDE_EFFECTS (arg1
))))
2913 /* Next handle constant cases, those for which we can return 1 even
2914 if ONLY_CONST is set. */
2915 if (TREE_CONSTANT (arg0
) && TREE_CONSTANT (arg1
))
2916 switch (TREE_CODE (arg0
))
2919 return tree_int_cst_equal (arg0
, arg1
);
2922 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (arg0
),
2923 TREE_FIXED_CST (arg1
));
2926 if (real_identical (&TREE_REAL_CST (arg0
), &TREE_REAL_CST (arg1
)))
2930 if (!HONOR_SIGNED_ZEROS (arg0
))
2932 /* If we do not distinguish between signed and unsigned zero,
2933 consider them equal. */
2934 if (real_zerop (arg0
) && real_zerop (arg1
))
2943 if (VECTOR_CST_NELTS (arg0
) != VECTOR_CST_NELTS (arg1
))
2946 for (i
= 0; i
< VECTOR_CST_NELTS (arg0
); ++i
)
2948 if (!operand_equal_p (VECTOR_CST_ELT (arg0
, i
),
2949 VECTOR_CST_ELT (arg1
, i
), flags
))
2956 return (operand_equal_p (TREE_REALPART (arg0
), TREE_REALPART (arg1
),
2958 && operand_equal_p (TREE_IMAGPART (arg0
), TREE_IMAGPART (arg1
),
2962 return (TREE_STRING_LENGTH (arg0
) == TREE_STRING_LENGTH (arg1
)
2963 && ! memcmp (TREE_STRING_POINTER (arg0
),
2964 TREE_STRING_POINTER (arg1
),
2965 TREE_STRING_LENGTH (arg0
)));
2968 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
2969 return operand_equal_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 0),
2970 flags
| OEP_ADDRESS_OF
2971 | OEP_MATCH_SIDE_EFFECTS
);
2973 /* In GIMPLE empty constructors are allowed in initializers of
2975 return !CONSTRUCTOR_NELTS (arg0
) && !CONSTRUCTOR_NELTS (arg1
);
2980 if (flags
& OEP_ONLY_CONST
)
2983 /* Define macros to test an operand from arg0 and arg1 for equality and a
2984 variant that allows null and views null as being different from any
2985 non-null value. In the latter case, if either is null, the both
2986 must be; otherwise, do the normal comparison. */
2987 #define OP_SAME(N) operand_equal_p (TREE_OPERAND (arg0, N), \
2988 TREE_OPERAND (arg1, N), flags)
2990 #define OP_SAME_WITH_NULL(N) \
2991 ((!TREE_OPERAND (arg0, N) || !TREE_OPERAND (arg1, N)) \
2992 ? TREE_OPERAND (arg0, N) == TREE_OPERAND (arg1, N) : OP_SAME (N))
2994 switch (TREE_CODE_CLASS (TREE_CODE (arg0
)))
2997 /* Two conversions are equal only if signedness and modes match. */
2998 switch (TREE_CODE (arg0
))
3001 case FIX_TRUNC_EXPR
:
3002 if (TYPE_UNSIGNED (TREE_TYPE (arg0
))
3003 != TYPE_UNSIGNED (TREE_TYPE (arg1
)))
3013 case tcc_comparison
:
3015 if (OP_SAME (0) && OP_SAME (1))
3018 /* For commutative ops, allow the other order. */
3019 return (commutative_tree_code (TREE_CODE (arg0
))
3020 && operand_equal_p (TREE_OPERAND (arg0
, 0),
3021 TREE_OPERAND (arg1
, 1), flags
)
3022 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3023 TREE_OPERAND (arg1
, 0), flags
));
3026 /* If either of the pointer (or reference) expressions we are
3027 dereferencing contain a side effect, these cannot be equal,
3028 but their addresses can be. */
3029 if ((flags
& OEP_MATCH_SIDE_EFFECTS
) == 0
3030 && (TREE_SIDE_EFFECTS (arg0
)
3031 || TREE_SIDE_EFFECTS (arg1
)))
3034 switch (TREE_CODE (arg0
))
3037 if (!(flags
& OEP_ADDRESS_OF
)
3038 && (TYPE_ALIGN (TREE_TYPE (arg0
))
3039 != TYPE_ALIGN (TREE_TYPE (arg1
))))
3041 flags
&= ~OEP_ADDRESS_OF
;
3045 /* Require the same offset. */
3046 if (!operand_equal_p (TYPE_SIZE (TREE_TYPE (arg0
)),
3047 TYPE_SIZE (TREE_TYPE (arg1
)),
3048 flags
& ~OEP_ADDRESS_OF
))
3053 case VIEW_CONVERT_EXPR
:
3056 case TARGET_MEM_REF
:
3058 if (!(flags
& OEP_ADDRESS_OF
))
3060 /* Require equal access sizes */
3061 if (TYPE_SIZE (TREE_TYPE (arg0
)) != TYPE_SIZE (TREE_TYPE (arg1
))
3062 && (!TYPE_SIZE (TREE_TYPE (arg0
))
3063 || !TYPE_SIZE (TREE_TYPE (arg1
))
3064 || !operand_equal_p (TYPE_SIZE (TREE_TYPE (arg0
)),
3065 TYPE_SIZE (TREE_TYPE (arg1
)),
3068 /* Verify that access happens in similar types. */
3069 if (!types_compatible_p (TREE_TYPE (arg0
), TREE_TYPE (arg1
)))
3071 /* Verify that accesses are TBAA compatible. */
3072 if (!alias_ptr_types_compatible_p
3073 (TREE_TYPE (TREE_OPERAND (arg0
, 1)),
3074 TREE_TYPE (TREE_OPERAND (arg1
, 1)))
3075 || (MR_DEPENDENCE_CLIQUE (arg0
)
3076 != MR_DEPENDENCE_CLIQUE (arg1
))
3077 || (MR_DEPENDENCE_BASE (arg0
)
3078 != MR_DEPENDENCE_BASE (arg1
)))
3080 /* Verify that alignment is compatible. */
3081 if (TYPE_ALIGN (TREE_TYPE (arg0
))
3082 != TYPE_ALIGN (TREE_TYPE (arg1
)))
3085 flags
&= ~OEP_ADDRESS_OF
;
3086 return (OP_SAME (0) && OP_SAME (1)
3087 /* TARGET_MEM_REF require equal extra operands. */
3088 && (TREE_CODE (arg0
) != TARGET_MEM_REF
3089 || (OP_SAME_WITH_NULL (2)
3090 && OP_SAME_WITH_NULL (3)
3091 && OP_SAME_WITH_NULL (4))));
3094 case ARRAY_RANGE_REF
:
3097 flags
&= ~OEP_ADDRESS_OF
;
3098 /* Compare the array index by value if it is constant first as we
3099 may have different types but same value here. */
3100 return ((tree_int_cst_equal (TREE_OPERAND (arg0
, 1),
3101 TREE_OPERAND (arg1
, 1))
3103 && OP_SAME_WITH_NULL (2)
3104 && OP_SAME_WITH_NULL (3)
3105 /* Compare low bound and element size as with OEP_ADDRESS_OF
3106 we have to account for the offset of the ref. */
3107 && (TREE_TYPE (TREE_OPERAND (arg0
, 0))
3108 == TREE_TYPE (TREE_OPERAND (arg1
, 0))
3109 || (operand_equal_p (array_ref_low_bound
3110 (CONST_CAST_TREE (arg0
)),
3112 (CONST_CAST_TREE (arg1
)), flags
)
3113 && operand_equal_p (array_ref_element_size
3114 (CONST_CAST_TREE (arg0
)),
3115 array_ref_element_size
3116 (CONST_CAST_TREE (arg1
)),
3120 /* Handle operand 2 the same as for ARRAY_REF. Operand 0
3121 may be NULL when we're called to compare MEM_EXPRs. */
3122 if (!OP_SAME_WITH_NULL (0)
3125 flags
&= ~OEP_ADDRESS_OF
;
3126 return OP_SAME_WITH_NULL (2);
3131 flags
&= ~OEP_ADDRESS_OF
;
3132 return OP_SAME (1) && OP_SAME (2);
3138 case tcc_expression
:
3139 switch (TREE_CODE (arg0
))
3142 /* Be sure we pass right ADDRESS_OF flag. */
3143 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3144 return operand_equal_p (TREE_OPERAND (arg0
, 0),
3145 TREE_OPERAND (arg1
, 0),
3146 flags
| OEP_ADDRESS_OF
);
3148 case TRUTH_NOT_EXPR
:
3151 case TRUTH_ANDIF_EXPR
:
3152 case TRUTH_ORIF_EXPR
:
3153 return OP_SAME (0) && OP_SAME (1);
3156 case WIDEN_MULT_PLUS_EXPR
:
3157 case WIDEN_MULT_MINUS_EXPR
:
3160 /* The multiplcation operands are commutative. */
3163 case TRUTH_AND_EXPR
:
3165 case TRUTH_XOR_EXPR
:
3166 if (OP_SAME (0) && OP_SAME (1))
3169 /* Otherwise take into account this is a commutative operation. */
3170 return (operand_equal_p (TREE_OPERAND (arg0
, 0),
3171 TREE_OPERAND (arg1
, 1), flags
)
3172 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3173 TREE_OPERAND (arg1
, 0), flags
));
3176 if (! OP_SAME (1) || ! OP_SAME_WITH_NULL (2))
3178 flags
&= ~OEP_ADDRESS_OF
;
3183 case BIT_INSERT_EXPR
:
3184 return OP_SAME (0) && OP_SAME (1) && OP_SAME (2);
3189 case PREDECREMENT_EXPR
:
3190 case PREINCREMENT_EXPR
:
3191 case POSTDECREMENT_EXPR
:
3192 case POSTINCREMENT_EXPR
:
3193 if (flags
& OEP_LEXICOGRAPHIC
)
3194 return OP_SAME (0) && OP_SAME (1);
3197 case CLEANUP_POINT_EXPR
:
3199 if (flags
& OEP_LEXICOGRAPHIC
)
3208 switch (TREE_CODE (arg0
))
3211 if ((CALL_EXPR_FN (arg0
) == NULL_TREE
)
3212 != (CALL_EXPR_FN (arg1
) == NULL_TREE
))
3213 /* If not both CALL_EXPRs are either internal or normal function
3214 functions, then they are not equal. */
3216 else if (CALL_EXPR_FN (arg0
) == NULL_TREE
)
3218 /* If the CALL_EXPRs call different internal functions, then they
3220 if (CALL_EXPR_IFN (arg0
) != CALL_EXPR_IFN (arg1
))
3225 /* If the CALL_EXPRs call different functions, then they are not
3227 if (! operand_equal_p (CALL_EXPR_FN (arg0
), CALL_EXPR_FN (arg1
),
3232 /* FIXME: We could skip this test for OEP_MATCH_SIDE_EFFECTS. */
3234 unsigned int cef
= call_expr_flags (arg0
);
3235 if (flags
& OEP_PURE_SAME
)
3236 cef
&= ECF_CONST
| ECF_PURE
;
3239 if (!cef
&& !(flags
& OEP_LEXICOGRAPHIC
))
3243 /* Now see if all the arguments are the same. */
3245 const_call_expr_arg_iterator iter0
, iter1
;
3247 for (a0
= first_const_call_expr_arg (arg0
, &iter0
),
3248 a1
= first_const_call_expr_arg (arg1
, &iter1
);
3250 a0
= next_const_call_expr_arg (&iter0
),
3251 a1
= next_const_call_expr_arg (&iter1
))
3252 if (! operand_equal_p (a0
, a1
, flags
))
3255 /* If we get here and both argument lists are exhausted
3256 then the CALL_EXPRs are equal. */
3257 return ! (a0
|| a1
);
3263 case tcc_declaration
:
3264 /* Consider __builtin_sqrt equal to sqrt. */
3265 return (TREE_CODE (arg0
) == FUNCTION_DECL
3266 && DECL_BUILT_IN (arg0
) && DECL_BUILT_IN (arg1
)
3267 && DECL_BUILT_IN_CLASS (arg0
) == DECL_BUILT_IN_CLASS (arg1
)
3268 && DECL_FUNCTION_CODE (arg0
) == DECL_FUNCTION_CODE (arg1
));
3270 case tcc_exceptional
:
3271 if (TREE_CODE (arg0
) == CONSTRUCTOR
)
3273 /* In GIMPLE constructors are used only to build vectors from
3274 elements. Individual elements in the constructor must be
3275 indexed in increasing order and form an initial sequence.
3277 We make no effort to compare constructors in generic.
3278 (see sem_variable::equals in ipa-icf which can do so for
3280 if (!VECTOR_TYPE_P (TREE_TYPE (arg0
))
3281 || !VECTOR_TYPE_P (TREE_TYPE (arg1
)))
3284 /* Be sure that vectors constructed have the same representation.
3285 We only tested element precision and modes to match.
3286 Vectors may be BLKmode and thus also check that the number of
3288 if (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
))
3289 != TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)))
3292 vec
<constructor_elt
, va_gc
> *v0
= CONSTRUCTOR_ELTS (arg0
);
3293 vec
<constructor_elt
, va_gc
> *v1
= CONSTRUCTOR_ELTS (arg1
);
3294 unsigned int len
= vec_safe_length (v0
);
3296 if (len
!= vec_safe_length (v1
))
3299 for (unsigned int i
= 0; i
< len
; i
++)
3301 constructor_elt
*c0
= &(*v0
)[i
];
3302 constructor_elt
*c1
= &(*v1
)[i
];
3304 if (!operand_equal_p (c0
->value
, c1
->value
, flags
)
3305 /* In GIMPLE the indexes can be either NULL or matching i.
3306 Double check this so we won't get false
3307 positives for GENERIC. */
3309 && (TREE_CODE (c0
->index
) != INTEGER_CST
3310 || !compare_tree_int (c0
->index
, i
)))
3312 && (TREE_CODE (c1
->index
) != INTEGER_CST
3313 || !compare_tree_int (c1
->index
, i
))))
3318 else if (TREE_CODE (arg0
) == STATEMENT_LIST
3319 && (flags
& OEP_LEXICOGRAPHIC
))
3321 /* Compare the STATEMENT_LISTs. */
3322 tree_stmt_iterator tsi1
, tsi2
;
3323 tree body1
= CONST_CAST_TREE (arg0
);
3324 tree body2
= CONST_CAST_TREE (arg1
);
3325 for (tsi1
= tsi_start (body1
), tsi2
= tsi_start (body2
); ;
3326 tsi_next (&tsi1
), tsi_next (&tsi2
))
3328 /* The lists don't have the same number of statements. */
3329 if (tsi_end_p (tsi1
) ^ tsi_end_p (tsi2
))
3331 if (tsi_end_p (tsi1
) && tsi_end_p (tsi2
))
3333 if (!operand_equal_p (tsi_stmt (tsi1
), tsi_stmt (tsi2
),
3341 switch (TREE_CODE (arg0
))
3344 if (flags
& OEP_LEXICOGRAPHIC
)
3345 return OP_SAME_WITH_NULL (0);
3356 #undef OP_SAME_WITH_NULL
3359 /* Similar to operand_equal_p, but see if ARG0 might have been made by
3360 shorten_compare from ARG1 when ARG1 was being compared with OTHER.
3362 When in doubt, return 0. */
3365 operand_equal_for_comparison_p (tree arg0
, tree arg1
, tree other
)
3367 int unsignedp1
, unsignedpo
;
3368 tree primarg0
, primarg1
, primother
;
3369 unsigned int correct_width
;
3371 if (operand_equal_p (arg0
, arg1
, 0))
3374 if (! INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
3375 || ! INTEGRAL_TYPE_P (TREE_TYPE (arg1
)))
3378 /* Discard any conversions that don't change the modes of ARG0 and ARG1
3379 and see if the inner values are the same. This removes any
3380 signedness comparison, which doesn't matter here. */
3381 primarg0
= arg0
, primarg1
= arg1
;
3382 STRIP_NOPS (primarg0
);
3383 STRIP_NOPS (primarg1
);
3384 if (operand_equal_p (primarg0
, primarg1
, 0))
3387 /* Duplicate what shorten_compare does to ARG1 and see if that gives the
3388 actual comparison operand, ARG0.
3390 First throw away any conversions to wider types
3391 already present in the operands. */
3393 primarg1
= get_narrower (arg1
, &unsignedp1
);
3394 primother
= get_narrower (other
, &unsignedpo
);
3396 correct_width
= TYPE_PRECISION (TREE_TYPE (arg1
));
3397 if (unsignedp1
== unsignedpo
3398 && TYPE_PRECISION (TREE_TYPE (primarg1
)) < correct_width
3399 && TYPE_PRECISION (TREE_TYPE (primother
)) < correct_width
)
3401 tree type
= TREE_TYPE (arg0
);
3403 /* Make sure shorter operand is extended the right way
3404 to match the longer operand. */
3405 primarg1
= fold_convert (signed_or_unsigned_type_for
3406 (unsignedp1
, TREE_TYPE (primarg1
)), primarg1
);
3408 if (operand_equal_p (arg0
, fold_convert (type
, primarg1
), 0))
3415 /* See if ARG is an expression that is either a comparison or is performing
3416 arithmetic on comparisons. The comparisons must only be comparing
3417 two different values, which will be stored in *CVAL1 and *CVAL2; if
3418 they are nonzero it means that some operands have already been found.
3419 No variables may be used anywhere else in the expression except in the
3420 comparisons. If SAVE_P is true it means we removed a SAVE_EXPR around
3421 the expression and save_expr needs to be called with CVAL1 and CVAL2.
3423 If this is true, return 1. Otherwise, return zero. */
3426 twoval_comparison_p (tree arg
, tree
*cval1
, tree
*cval2
, int *save_p
)
3428 enum tree_code code
= TREE_CODE (arg
);
3429 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
3431 /* We can handle some of the tcc_expression cases here. */
3432 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
3434 else if (tclass
== tcc_expression
3435 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
3436 || code
== COMPOUND_EXPR
))
3437 tclass
= tcc_binary
;
3439 else if (tclass
== tcc_expression
&& code
== SAVE_EXPR
3440 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg
, 0)))
3442 /* If we've already found a CVAL1 or CVAL2, this expression is
3443 two complex to handle. */
3444 if (*cval1
|| *cval2
)
3454 return twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
, save_p
);
3457 return (twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
, save_p
)
3458 && twoval_comparison_p (TREE_OPERAND (arg
, 1),
3459 cval1
, cval2
, save_p
));
3464 case tcc_expression
:
3465 if (code
== COND_EXPR
)
3466 return (twoval_comparison_p (TREE_OPERAND (arg
, 0),
3467 cval1
, cval2
, save_p
)
3468 && twoval_comparison_p (TREE_OPERAND (arg
, 1),
3469 cval1
, cval2
, save_p
)
3470 && twoval_comparison_p (TREE_OPERAND (arg
, 2),
3471 cval1
, cval2
, save_p
));
3474 case tcc_comparison
:
3475 /* First see if we can handle the first operand, then the second. For
3476 the second operand, we know *CVAL1 can't be zero. It must be that
3477 one side of the comparison is each of the values; test for the
3478 case where this isn't true by failing if the two operands
3481 if (operand_equal_p (TREE_OPERAND (arg
, 0),
3482 TREE_OPERAND (arg
, 1), 0))
3486 *cval1
= TREE_OPERAND (arg
, 0);
3487 else if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 0), 0))
3489 else if (*cval2
== 0)
3490 *cval2
= TREE_OPERAND (arg
, 0);
3491 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 0), 0))
3496 if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 1), 0))
3498 else if (*cval2
== 0)
3499 *cval2
= TREE_OPERAND (arg
, 1);
3500 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 1), 0))
3512 /* ARG is a tree that is known to contain just arithmetic operations and
3513 comparisons. Evaluate the operations in the tree substituting NEW0 for
3514 any occurrence of OLD0 as an operand of a comparison and likewise for
3518 eval_subst (location_t loc
, tree arg
, tree old0
, tree new0
,
3519 tree old1
, tree new1
)
3521 tree type
= TREE_TYPE (arg
);
3522 enum tree_code code
= TREE_CODE (arg
);
3523 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
3525 /* We can handle some of the tcc_expression cases here. */
3526 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
3528 else if (tclass
== tcc_expression
3529 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
3530 tclass
= tcc_binary
;
3535 return fold_build1_loc (loc
, code
, type
,
3536 eval_subst (loc
, TREE_OPERAND (arg
, 0),
3537 old0
, new0
, old1
, new1
));
3540 return fold_build2_loc (loc
, code
, type
,
3541 eval_subst (loc
, TREE_OPERAND (arg
, 0),
3542 old0
, new0
, old1
, new1
),
3543 eval_subst (loc
, TREE_OPERAND (arg
, 1),
3544 old0
, new0
, old1
, new1
));
3546 case tcc_expression
:
3550 return eval_subst (loc
, TREE_OPERAND (arg
, 0), old0
, new0
,
3554 return eval_subst (loc
, TREE_OPERAND (arg
, 1), old0
, new0
,
3558 return fold_build3_loc (loc
, code
, type
,
3559 eval_subst (loc
, TREE_OPERAND (arg
, 0),
3560 old0
, new0
, old1
, new1
),
3561 eval_subst (loc
, TREE_OPERAND (arg
, 1),
3562 old0
, new0
, old1
, new1
),
3563 eval_subst (loc
, TREE_OPERAND (arg
, 2),
3564 old0
, new0
, old1
, new1
));
3568 /* Fall through - ??? */
3570 case tcc_comparison
:
3572 tree arg0
= TREE_OPERAND (arg
, 0);
3573 tree arg1
= TREE_OPERAND (arg
, 1);
3575 /* We need to check both for exact equality and tree equality. The
3576 former will be true if the operand has a side-effect. In that
3577 case, we know the operand occurred exactly once. */
3579 if (arg0
== old0
|| operand_equal_p (arg0
, old0
, 0))
3581 else if (arg0
== old1
|| operand_equal_p (arg0
, old1
, 0))
3584 if (arg1
== old0
|| operand_equal_p (arg1
, old0
, 0))
3586 else if (arg1
== old1
|| operand_equal_p (arg1
, old1
, 0))
3589 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
3597 /* Return a tree for the case when the result of an expression is RESULT
3598 converted to TYPE and OMITTED was previously an operand of the expression
3599 but is now not needed (e.g., we folded OMITTED * 0).
3601 If OMITTED has side effects, we must evaluate it. Otherwise, just do
3602 the conversion of RESULT to TYPE. */
3605 omit_one_operand_loc (location_t loc
, tree type
, tree result
, tree omitted
)
3607 tree t
= fold_convert_loc (loc
, type
, result
);
3609 /* If the resulting operand is an empty statement, just return the omitted
3610 statement casted to void. */
3611 if (IS_EMPTY_STMT (t
) && TREE_SIDE_EFFECTS (omitted
))
3612 return build1_loc (loc
, NOP_EXPR
, void_type_node
,
3613 fold_ignored_result (omitted
));
3615 if (TREE_SIDE_EFFECTS (omitted
))
3616 return build2_loc (loc
, COMPOUND_EXPR
, type
,
3617 fold_ignored_result (omitted
), t
);
3619 return non_lvalue_loc (loc
, t
);
3622 /* Return a tree for the case when the result of an expression is RESULT
3623 converted to TYPE and OMITTED1 and OMITTED2 were previously operands
3624 of the expression but are now not needed.
3626 If OMITTED1 or OMITTED2 has side effects, they must be evaluated.
3627 If both OMITTED1 and OMITTED2 have side effects, OMITTED1 is
3628 evaluated before OMITTED2. Otherwise, if neither has side effects,
3629 just do the conversion of RESULT to TYPE. */
3632 omit_two_operands_loc (location_t loc
, tree type
, tree result
,
3633 tree omitted1
, tree omitted2
)
3635 tree t
= fold_convert_loc (loc
, type
, result
);
3637 if (TREE_SIDE_EFFECTS (omitted2
))
3638 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted2
, t
);
3639 if (TREE_SIDE_EFFECTS (omitted1
))
3640 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted1
, t
);
3642 return TREE_CODE (t
) != COMPOUND_EXPR
? non_lvalue_loc (loc
, t
) : t
;
3646 /* Return a simplified tree node for the truth-negation of ARG. This
3647 never alters ARG itself. We assume that ARG is an operation that
3648 returns a truth value (0 or 1).
3650 FIXME: one would think we would fold the result, but it causes
3651 problems with the dominator optimizer. */
3654 fold_truth_not_expr (location_t loc
, tree arg
)
3656 tree type
= TREE_TYPE (arg
);
3657 enum tree_code code
= TREE_CODE (arg
);
3658 location_t loc1
, loc2
;
3660 /* If this is a comparison, we can simply invert it, except for
3661 floating-point non-equality comparisons, in which case we just
3662 enclose a TRUTH_NOT_EXPR around what we have. */
3664 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
3666 tree op_type
= TREE_TYPE (TREE_OPERAND (arg
, 0));
3667 if (FLOAT_TYPE_P (op_type
)
3668 && flag_trapping_math
3669 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
3670 && code
!= NE_EXPR
&& code
!= EQ_EXPR
)
3673 code
= invert_tree_comparison (code
, HONOR_NANS (op_type
));
3674 if (code
== ERROR_MARK
)
3677 tree ret
= build2_loc (loc
, code
, type
, TREE_OPERAND (arg
, 0),
3678 TREE_OPERAND (arg
, 1));
3679 if (TREE_NO_WARNING (arg
))
3680 TREE_NO_WARNING (ret
) = 1;
3687 return constant_boolean_node (integer_zerop (arg
), type
);
3689 case TRUTH_AND_EXPR
:
3690 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3691 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3692 return build2_loc (loc
, TRUTH_OR_EXPR
, type
,
3693 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3694 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3697 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3698 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3699 return build2_loc (loc
, TRUTH_AND_EXPR
, type
,
3700 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3701 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3703 case TRUTH_XOR_EXPR
:
3704 /* Here we can invert either operand. We invert the first operand
3705 unless the second operand is a TRUTH_NOT_EXPR in which case our
3706 result is the XOR of the first operand with the inside of the
3707 negation of the second operand. */
3709 if (TREE_CODE (TREE_OPERAND (arg
, 1)) == TRUTH_NOT_EXPR
)
3710 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
, TREE_OPERAND (arg
, 0),
3711 TREE_OPERAND (TREE_OPERAND (arg
, 1), 0));
3713 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
,
3714 invert_truthvalue_loc (loc
, TREE_OPERAND (arg
, 0)),
3715 TREE_OPERAND (arg
, 1));
3717 case TRUTH_ANDIF_EXPR
:
3718 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3719 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3720 return build2_loc (loc
, TRUTH_ORIF_EXPR
, type
,
3721 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3722 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3724 case TRUTH_ORIF_EXPR
:
3725 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3726 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3727 return build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
3728 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3729 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3731 case TRUTH_NOT_EXPR
:
3732 return TREE_OPERAND (arg
, 0);
3736 tree arg1
= TREE_OPERAND (arg
, 1);
3737 tree arg2
= TREE_OPERAND (arg
, 2);
3739 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3740 loc2
= expr_location_or (TREE_OPERAND (arg
, 2), loc
);
3742 /* A COND_EXPR may have a throw as one operand, which
3743 then has void type. Just leave void operands
3745 return build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg
, 0),
3746 VOID_TYPE_P (TREE_TYPE (arg1
))
3747 ? arg1
: invert_truthvalue_loc (loc1
, arg1
),
3748 VOID_TYPE_P (TREE_TYPE (arg2
))
3749 ? arg2
: invert_truthvalue_loc (loc2
, arg2
));
3753 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3754 return build2_loc (loc
, COMPOUND_EXPR
, type
,
3755 TREE_OPERAND (arg
, 0),
3756 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 1)));
3758 case NON_LVALUE_EXPR
:
3759 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3760 return invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0));
3763 if (TREE_CODE (TREE_TYPE (arg
)) == BOOLEAN_TYPE
)
3764 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
3769 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3770 return build1_loc (loc
, TREE_CODE (arg
), type
,
3771 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
3774 if (!integer_onep (TREE_OPERAND (arg
, 1)))
3776 return build2_loc (loc
, EQ_EXPR
, type
, arg
, build_int_cst (type
, 0));
3779 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
3781 case CLEANUP_POINT_EXPR
:
3782 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3783 return build1_loc (loc
, CLEANUP_POINT_EXPR
, type
,
3784 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
3791 /* Fold the truth-negation of ARG. This never alters ARG itself. We
3792 assume that ARG is an operation that returns a truth value (0 or 1
3793 for scalars, 0 or -1 for vectors). Return the folded expression if
3794 folding is successful. Otherwise, return NULL_TREE. */
3797 fold_invert_truthvalue (location_t loc
, tree arg
)
3799 tree type
= TREE_TYPE (arg
);
3800 return fold_unary_loc (loc
, VECTOR_TYPE_P (type
)
3806 /* Return a simplified tree node for the truth-negation of ARG. This
3807 never alters ARG itself. We assume that ARG is an operation that
3808 returns a truth value (0 or 1 for scalars, 0 or -1 for vectors). */
3811 invert_truthvalue_loc (location_t loc
, tree arg
)
3813 if (TREE_CODE (arg
) == ERROR_MARK
)
3816 tree type
= TREE_TYPE (arg
);
3817 return fold_build1_loc (loc
, VECTOR_TYPE_P (type
)
3823 /* Knowing that ARG0 and ARG1 are both RDIV_EXPRs, simplify a binary operation
3824 with code CODE. This optimization is unsafe. */
3826 distribute_real_division (location_t loc
, enum tree_code code
, tree type
,
3827 tree arg0
, tree arg1
)
3829 bool mul0
= TREE_CODE (arg0
) == MULT_EXPR
;
3830 bool mul1
= TREE_CODE (arg1
) == MULT_EXPR
;
3832 /* (A / C) +- (B / C) -> (A +- B) / C. */
3834 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3835 TREE_OPERAND (arg1
, 1), 0))
3836 return fold_build2_loc (loc
, mul0
? MULT_EXPR
: RDIV_EXPR
, type
,
3837 fold_build2_loc (loc
, code
, type
,
3838 TREE_OPERAND (arg0
, 0),
3839 TREE_OPERAND (arg1
, 0)),
3840 TREE_OPERAND (arg0
, 1));
3842 /* (A / C1) +- (A / C2) -> A * (1 / C1 +- 1 / C2). */
3843 if (operand_equal_p (TREE_OPERAND (arg0
, 0),
3844 TREE_OPERAND (arg1
, 0), 0)
3845 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == REAL_CST
3846 && TREE_CODE (TREE_OPERAND (arg1
, 1)) == REAL_CST
)
3848 REAL_VALUE_TYPE r0
, r1
;
3849 r0
= TREE_REAL_CST (TREE_OPERAND (arg0
, 1));
3850 r1
= TREE_REAL_CST (TREE_OPERAND (arg1
, 1));
3852 real_arithmetic (&r0
, RDIV_EXPR
, &dconst1
, &r0
);
3854 real_arithmetic (&r1
, RDIV_EXPR
, &dconst1
, &r1
);
3855 real_arithmetic (&r0
, code
, &r0
, &r1
);
3856 return fold_build2_loc (loc
, MULT_EXPR
, type
,
3857 TREE_OPERAND (arg0
, 0),
3858 build_real (type
, r0
));
3864 /* Return a BIT_FIELD_REF of type TYPE to refer to BITSIZE bits of INNER
3865 starting at BITPOS. The field is unsigned if UNSIGNEDP is nonzero
3866 and uses reverse storage order if REVERSEP is nonzero. ORIG_INNER
3867 is the original memory reference used to preserve the alias set of
3871 make_bit_field_ref (location_t loc
, tree inner
, tree orig_inner
, tree type
,
3872 HOST_WIDE_INT bitsize
, HOST_WIDE_INT bitpos
,
3873 int unsignedp
, int reversep
)
3875 tree result
, bftype
;
3877 /* Attempt not to lose the access path if possible. */
3878 if (TREE_CODE (orig_inner
) == COMPONENT_REF
)
3880 tree ninner
= TREE_OPERAND (orig_inner
, 0);
3882 HOST_WIDE_INT nbitsize
, nbitpos
;
3884 int nunsignedp
, nreversep
, nvolatilep
= 0;
3885 tree base
= get_inner_reference (ninner
, &nbitsize
, &nbitpos
,
3886 &noffset
, &nmode
, &nunsignedp
,
3887 &nreversep
, &nvolatilep
);
3889 && noffset
== NULL_TREE
3890 && nbitsize
>= bitsize
3891 && nbitpos
<= bitpos
3892 && bitpos
+ bitsize
<= nbitpos
+ nbitsize
3902 alias_set_type iset
= get_alias_set (orig_inner
);
3903 if (iset
== 0 && get_alias_set (inner
) != iset
)
3904 inner
= fold_build2 (MEM_REF
, TREE_TYPE (inner
),
3905 build_fold_addr_expr (inner
),
3906 build_int_cst (ptr_type_node
, 0));
3908 if (bitpos
== 0 && !reversep
)
3910 tree size
= TYPE_SIZE (TREE_TYPE (inner
));
3911 if ((INTEGRAL_TYPE_P (TREE_TYPE (inner
))
3912 || POINTER_TYPE_P (TREE_TYPE (inner
)))
3913 && tree_fits_shwi_p (size
)
3914 && tree_to_shwi (size
) == bitsize
)
3915 return fold_convert_loc (loc
, type
, inner
);
3919 if (TYPE_PRECISION (bftype
) != bitsize
3920 || TYPE_UNSIGNED (bftype
) == !unsignedp
)
3921 bftype
= build_nonstandard_integer_type (bitsize
, 0);
3923 result
= build3_loc (loc
, BIT_FIELD_REF
, bftype
, inner
,
3924 size_int (bitsize
), bitsize_int (bitpos
));
3925 REF_REVERSE_STORAGE_ORDER (result
) = reversep
;
3928 result
= fold_convert_loc (loc
, type
, result
);
3933 /* Optimize a bit-field compare.
3935 There are two cases: First is a compare against a constant and the
3936 second is a comparison of two items where the fields are at the same
3937 bit position relative to the start of a chunk (byte, halfword, word)
3938 large enough to contain it. In these cases we can avoid the shift
3939 implicit in bitfield extractions.
3941 For constants, we emit a compare of the shifted constant with the
3942 BIT_AND_EXPR of a mask and a byte, halfword, or word of the operand being
3943 compared. For two fields at the same position, we do the ANDs with the
3944 similar mask and compare the result of the ANDs.
3946 CODE is the comparison code, known to be either NE_EXPR or EQ_EXPR.
3947 COMPARE_TYPE is the type of the comparison, and LHS and RHS
3948 are the left and right operands of the comparison, respectively.
3950 If the optimization described above can be done, we return the resulting
3951 tree. Otherwise we return zero. */
3954 optimize_bit_field_compare (location_t loc
, enum tree_code code
,
3955 tree compare_type
, tree lhs
, tree rhs
)
3957 HOST_WIDE_INT lbitpos
, lbitsize
, rbitpos
, rbitsize
, nbitpos
, nbitsize
;
3958 tree type
= TREE_TYPE (lhs
);
3960 int const_p
= TREE_CODE (rhs
) == INTEGER_CST
;
3961 machine_mode lmode
, rmode
, nmode
;
3962 int lunsignedp
, runsignedp
;
3963 int lreversep
, rreversep
;
3964 int lvolatilep
= 0, rvolatilep
= 0;
3965 tree linner
, rinner
= NULL_TREE
;
3969 /* Get all the information about the extractions being done. If the bit size
3970 if the same as the size of the underlying object, we aren't doing an
3971 extraction at all and so can do nothing. We also don't want to
3972 do anything if the inner expression is a PLACEHOLDER_EXPR since we
3973 then will no longer be able to replace it. */
3974 linner
= get_inner_reference (lhs
, &lbitsize
, &lbitpos
, &offset
, &lmode
,
3975 &lunsignedp
, &lreversep
, &lvolatilep
);
3976 if (linner
== lhs
|| lbitsize
== GET_MODE_BITSIZE (lmode
) || lbitsize
< 0
3977 || offset
!= 0 || TREE_CODE (linner
) == PLACEHOLDER_EXPR
|| lvolatilep
)
3981 rreversep
= lreversep
;
3984 /* If this is not a constant, we can only do something if bit positions,
3985 sizes, signedness and storage order are the same. */
3987 = get_inner_reference (rhs
, &rbitsize
, &rbitpos
, &offset
, &rmode
,
3988 &runsignedp
, &rreversep
, &rvolatilep
);
3990 if (rinner
== rhs
|| lbitpos
!= rbitpos
|| lbitsize
!= rbitsize
3991 || lunsignedp
!= runsignedp
|| lreversep
!= rreversep
|| offset
!= 0
3992 || TREE_CODE (rinner
) == PLACEHOLDER_EXPR
|| rvolatilep
)
3996 /* Honor the C++ memory model and mimic what RTL expansion does. */
3997 unsigned HOST_WIDE_INT bitstart
= 0;
3998 unsigned HOST_WIDE_INT bitend
= 0;
3999 if (TREE_CODE (lhs
) == COMPONENT_REF
)
4001 get_bit_range (&bitstart
, &bitend
, lhs
, &lbitpos
, &offset
);
4002 if (offset
!= NULL_TREE
)
4006 /* See if we can find a mode to refer to this field. We should be able to,
4007 but fail if we can't. */
4008 nmode
= get_best_mode (lbitsize
, lbitpos
, bitstart
, bitend
,
4009 const_p
? TYPE_ALIGN (TREE_TYPE (linner
))
4010 : MIN (TYPE_ALIGN (TREE_TYPE (linner
)),
4011 TYPE_ALIGN (TREE_TYPE (rinner
))),
4013 if (nmode
== VOIDmode
)
4016 /* Set signed and unsigned types of the precision of this mode for the
4018 unsigned_type
= lang_hooks
.types
.type_for_mode (nmode
, 1);
4020 /* Compute the bit position and size for the new reference and our offset
4021 within it. If the new reference is the same size as the original, we
4022 won't optimize anything, so return zero. */
4023 nbitsize
= GET_MODE_BITSIZE (nmode
);
4024 nbitpos
= lbitpos
& ~ (nbitsize
- 1);
4026 if (nbitsize
== lbitsize
)
4029 if (lreversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
4030 lbitpos
= nbitsize
- lbitsize
- lbitpos
;
4032 /* Make the mask to be used against the extracted field. */
4033 mask
= build_int_cst_type (unsigned_type
, -1);
4034 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (nbitsize
- lbitsize
));
4035 mask
= const_binop (RSHIFT_EXPR
, mask
,
4036 size_int (nbitsize
- lbitsize
- lbitpos
));
4039 /* If not comparing with constant, just rework the comparison
4041 return fold_build2_loc (loc
, code
, compare_type
,
4042 fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
4043 make_bit_field_ref (loc
, linner
, lhs
,
4048 fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
4049 make_bit_field_ref (loc
, rinner
, rhs
,
4055 /* Otherwise, we are handling the constant case. See if the constant is too
4056 big for the field. Warn and return a tree for 0 (false) if so. We do
4057 this not only for its own sake, but to avoid having to test for this
4058 error case below. If we didn't, we might generate wrong code.
4060 For unsigned fields, the constant shifted right by the field length should
4061 be all zero. For signed fields, the high-order bits should agree with
4066 if (wi::lrshift (rhs
, lbitsize
) != 0)
4068 warning (0, "comparison is always %d due to width of bit-field",
4070 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
4075 wide_int tem
= wi::arshift (rhs
, lbitsize
- 1);
4076 if (tem
!= 0 && tem
!= -1)
4078 warning (0, "comparison is always %d due to width of bit-field",
4080 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
4084 /* Single-bit compares should always be against zero. */
4085 if (lbitsize
== 1 && ! integer_zerop (rhs
))
4087 code
= code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
;
4088 rhs
= build_int_cst (type
, 0);
4091 /* Make a new bitfield reference, shift the constant over the
4092 appropriate number of bits and mask it with the computed mask
4093 (in case this was a signed field). If we changed it, make a new one. */
4094 lhs
= make_bit_field_ref (loc
, linner
, lhs
, unsigned_type
,
4095 nbitsize
, nbitpos
, 1, lreversep
);
4097 rhs
= const_binop (BIT_AND_EXPR
,
4098 const_binop (LSHIFT_EXPR
,
4099 fold_convert_loc (loc
, unsigned_type
, rhs
),
4100 size_int (lbitpos
)),
4103 lhs
= build2_loc (loc
, code
, compare_type
,
4104 build2 (BIT_AND_EXPR
, unsigned_type
, lhs
, mask
), rhs
);
4108 /* Subroutine for fold_truth_andor_1: decode a field reference.
4110 If EXP is a comparison reference, we return the innermost reference.
4112 *PBITSIZE is set to the number of bits in the reference, *PBITPOS is
4113 set to the starting bit number.
4115 If the innermost field can be completely contained in a mode-sized
4116 unit, *PMODE is set to that mode. Otherwise, it is set to VOIDmode.
4118 *PVOLATILEP is set to 1 if the any expression encountered is volatile;
4119 otherwise it is not changed.
4121 *PUNSIGNEDP is set to the signedness of the field.
4123 *PREVERSEP is set to the storage order of the field.
4125 *PMASK is set to the mask used. This is either contained in a
4126 BIT_AND_EXPR or derived from the width of the field.
4128 *PAND_MASK is set to the mask found in a BIT_AND_EXPR, if any.
4130 Return 0 if this is not a component reference or is one that we can't
4131 do anything with. */
4134 decode_field_reference (location_t loc
, tree
*exp_
, HOST_WIDE_INT
*pbitsize
,
4135 HOST_WIDE_INT
*pbitpos
, machine_mode
*pmode
,
4136 int *punsignedp
, int *preversep
, int *pvolatilep
,
4137 tree
*pmask
, tree
*pand_mask
)
4140 tree outer_type
= 0;
4142 tree mask
, inner
, offset
;
4144 unsigned int precision
;
4146 /* All the optimizations using this function assume integer fields.
4147 There are problems with FP fields since the type_for_size call
4148 below can fail for, e.g., XFmode. */
4149 if (! INTEGRAL_TYPE_P (TREE_TYPE (exp
)))
4152 /* We are interested in the bare arrangement of bits, so strip everything
4153 that doesn't affect the machine mode. However, record the type of the
4154 outermost expression if it may matter below. */
4155 if (CONVERT_EXPR_P (exp
)
4156 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
4157 outer_type
= TREE_TYPE (exp
);
4160 if (TREE_CODE (exp
) == BIT_AND_EXPR
)
4162 and_mask
= TREE_OPERAND (exp
, 1);
4163 exp
= TREE_OPERAND (exp
, 0);
4164 STRIP_NOPS (exp
); STRIP_NOPS (and_mask
);
4165 if (TREE_CODE (and_mask
) != INTEGER_CST
)
4169 inner
= get_inner_reference (exp
, pbitsize
, pbitpos
, &offset
, pmode
,
4170 punsignedp
, preversep
, pvolatilep
);
4171 if ((inner
== exp
&& and_mask
== 0)
4172 || *pbitsize
< 0 || offset
!= 0
4173 || TREE_CODE (inner
) == PLACEHOLDER_EXPR
4174 /* Reject out-of-bound accesses (PR79731). */
4175 || (! AGGREGATE_TYPE_P (TREE_TYPE (inner
))
4176 && compare_tree_int (TYPE_SIZE (TREE_TYPE (inner
)),
4177 *pbitpos
+ *pbitsize
) < 0))
4182 /* If the number of bits in the reference is the same as the bitsize of
4183 the outer type, then the outer type gives the signedness. Otherwise
4184 (in case of a small bitfield) the signedness is unchanged. */
4185 if (outer_type
&& *pbitsize
== TYPE_PRECISION (outer_type
))
4186 *punsignedp
= TYPE_UNSIGNED (outer_type
);
4188 /* Compute the mask to access the bitfield. */
4189 unsigned_type
= lang_hooks
.types
.type_for_size (*pbitsize
, 1);
4190 precision
= TYPE_PRECISION (unsigned_type
);
4192 mask
= build_int_cst_type (unsigned_type
, -1);
4194 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
4195 mask
= const_binop (RSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
4197 /* Merge it with the mask we found in the BIT_AND_EXPR, if any. */
4199 mask
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
4200 fold_convert_loc (loc
, unsigned_type
, and_mask
), mask
);
4203 *pand_mask
= and_mask
;
4207 /* Return nonzero if MASK represents a mask of SIZE ones in the low-order
4208 bit positions and MASK is SIGNED. */
4211 all_ones_mask_p (const_tree mask
, unsigned int size
)
4213 tree type
= TREE_TYPE (mask
);
4214 unsigned int precision
= TYPE_PRECISION (type
);
4216 /* If this function returns true when the type of the mask is
4217 UNSIGNED, then there will be errors. In particular see
4218 gcc.c-torture/execute/990326-1.c. There does not appear to be
4219 any documentation paper trail as to why this is so. But the pre
4220 wide-int worked with that restriction and it has been preserved
4222 if (size
> precision
|| TYPE_SIGN (type
) == UNSIGNED
)
4225 return wi::mask (size
, false, precision
) == mask
;
4228 /* Subroutine for fold: determine if VAL is the INTEGER_CONST that
4229 represents the sign bit of EXP's type. If EXP represents a sign
4230 or zero extension, also test VAL against the unextended type.
4231 The return value is the (sub)expression whose sign bit is VAL,
4232 or NULL_TREE otherwise. */
4235 sign_bit_p (tree exp
, const_tree val
)
4240 /* Tree EXP must have an integral type. */
4241 t
= TREE_TYPE (exp
);
4242 if (! INTEGRAL_TYPE_P (t
))
4245 /* Tree VAL must be an integer constant. */
4246 if (TREE_CODE (val
) != INTEGER_CST
4247 || TREE_OVERFLOW (val
))
4250 width
= TYPE_PRECISION (t
);
4251 if (wi::only_sign_bit_p (val
, width
))
4254 /* Handle extension from a narrower type. */
4255 if (TREE_CODE (exp
) == NOP_EXPR
4256 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp
, 0))) < width
)
4257 return sign_bit_p (TREE_OPERAND (exp
, 0), val
);
4262 /* Subroutine for fold_truth_andor_1: determine if an operand is simple enough
4263 to be evaluated unconditionally. */
4266 simple_operand_p (const_tree exp
)
4268 /* Strip any conversions that don't change the machine mode. */
4271 return (CONSTANT_CLASS_P (exp
)
4272 || TREE_CODE (exp
) == SSA_NAME
4274 && ! TREE_ADDRESSABLE (exp
)
4275 && ! TREE_THIS_VOLATILE (exp
)
4276 && ! DECL_NONLOCAL (exp
)
4277 /* Don't regard global variables as simple. They may be
4278 allocated in ways unknown to the compiler (shared memory,
4279 #pragma weak, etc). */
4280 && ! TREE_PUBLIC (exp
)
4281 && ! DECL_EXTERNAL (exp
)
4282 /* Weakrefs are not safe to be read, since they can be NULL.
4283 They are !TREE_PUBLIC && !DECL_EXTERNAL but still
4284 have DECL_WEAK flag set. */
4285 && (! VAR_OR_FUNCTION_DECL_P (exp
) || ! DECL_WEAK (exp
))
4286 /* Loading a static variable is unduly expensive, but global
4287 registers aren't expensive. */
4288 && (! TREE_STATIC (exp
) || DECL_REGISTER (exp
))));
4291 /* Subroutine for fold_truth_andor: determine if an operand is simple enough
4292 to be evaluated unconditionally.
4293 I addition to simple_operand_p, we assume that comparisons, conversions,
4294 and logic-not operations are simple, if their operands are simple, too. */
4297 simple_operand_p_2 (tree exp
)
4299 enum tree_code code
;
4301 if (TREE_SIDE_EFFECTS (exp
)
4302 || tree_could_trap_p (exp
))
4305 while (CONVERT_EXPR_P (exp
))
4306 exp
= TREE_OPERAND (exp
, 0);
4308 code
= TREE_CODE (exp
);
4310 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
4311 return (simple_operand_p (TREE_OPERAND (exp
, 0))
4312 && simple_operand_p (TREE_OPERAND (exp
, 1)));
4314 if (code
== TRUTH_NOT_EXPR
)
4315 return simple_operand_p_2 (TREE_OPERAND (exp
, 0));
4317 return simple_operand_p (exp
);
4321 /* The following functions are subroutines to fold_range_test and allow it to
4322 try to change a logical combination of comparisons into a range test.
4325 X == 2 || X == 3 || X == 4 || X == 5
4329 (unsigned) (X - 2) <= 3
4331 We describe each set of comparisons as being either inside or outside
4332 a range, using a variable named like IN_P, and then describe the
4333 range with a lower and upper bound. If one of the bounds is omitted,
4334 it represents either the highest or lowest value of the type.
4336 In the comments below, we represent a range by two numbers in brackets
4337 preceded by a "+" to designate being inside that range, or a "-" to
4338 designate being outside that range, so the condition can be inverted by
4339 flipping the prefix. An omitted bound is represented by a "-". For
4340 example, "- [-, 10]" means being outside the range starting at the lowest
4341 possible value and ending at 10, in other words, being greater than 10.
4342 The range "+ [-, -]" is always true and hence the range "- [-, -]" is
4345 We set up things so that the missing bounds are handled in a consistent
4346 manner so neither a missing bound nor "true" and "false" need to be
4347 handled using a special case. */
4349 /* Return the result of applying CODE to ARG0 and ARG1, but handle the case
4350 of ARG0 and/or ARG1 being omitted, meaning an unlimited range. UPPER0_P
4351 and UPPER1_P are nonzero if the respective argument is an upper bound
4352 and zero for a lower. TYPE, if nonzero, is the type of the result; it
4353 must be specified for a comparison. ARG1 will be converted to ARG0's
4354 type if both are specified. */
4357 range_binop (enum tree_code code
, tree type
, tree arg0
, int upper0_p
,
4358 tree arg1
, int upper1_p
)
4364 /* If neither arg represents infinity, do the normal operation.
4365 Else, if not a comparison, return infinity. Else handle the special
4366 comparison rules. Note that most of the cases below won't occur, but
4367 are handled for consistency. */
4369 if (arg0
!= 0 && arg1
!= 0)
4371 tem
= fold_build2 (code
, type
!= 0 ? type
: TREE_TYPE (arg0
),
4372 arg0
, fold_convert (TREE_TYPE (arg0
), arg1
));
4374 return TREE_CODE (tem
) == INTEGER_CST
? tem
: 0;
4377 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
4380 /* Set SGN[01] to -1 if ARG[01] is a lower bound, 1 for upper, and 0
4381 for neither. In real maths, we cannot assume open ended ranges are
4382 the same. But, this is computer arithmetic, where numbers are finite.
4383 We can therefore make the transformation of any unbounded range with
4384 the value Z, Z being greater than any representable number. This permits
4385 us to treat unbounded ranges as equal. */
4386 sgn0
= arg0
!= 0 ? 0 : (upper0_p
? 1 : -1);
4387 sgn1
= arg1
!= 0 ? 0 : (upper1_p
? 1 : -1);
4391 result
= sgn0
== sgn1
;
4394 result
= sgn0
!= sgn1
;
4397 result
= sgn0
< sgn1
;
4400 result
= sgn0
<= sgn1
;
4403 result
= sgn0
> sgn1
;
4406 result
= sgn0
>= sgn1
;
4412 return constant_boolean_node (result
, type
);
4415 /* Helper routine for make_range. Perform one step for it, return
4416 new expression if the loop should continue or NULL_TREE if it should
4420 make_range_step (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
,
4421 tree exp_type
, tree
*p_low
, tree
*p_high
, int *p_in_p
,
4422 bool *strict_overflow_p
)
4424 tree arg0_type
= TREE_TYPE (arg0
);
4425 tree n_low
, n_high
, low
= *p_low
, high
= *p_high
;
4426 int in_p
= *p_in_p
, n_in_p
;
4430 case TRUTH_NOT_EXPR
:
4431 /* We can only do something if the range is testing for zero. */
4432 if (low
== NULL_TREE
|| high
== NULL_TREE
4433 || ! integer_zerop (low
) || ! integer_zerop (high
))
4438 case EQ_EXPR
: case NE_EXPR
:
4439 case LT_EXPR
: case LE_EXPR
: case GE_EXPR
: case GT_EXPR
:
4440 /* We can only do something if the range is testing for zero
4441 and if the second operand is an integer constant. Note that
4442 saying something is "in" the range we make is done by
4443 complementing IN_P since it will set in the initial case of
4444 being not equal to zero; "out" is leaving it alone. */
4445 if (low
== NULL_TREE
|| high
== NULL_TREE
4446 || ! integer_zerop (low
) || ! integer_zerop (high
)
4447 || TREE_CODE (arg1
) != INTEGER_CST
)
4452 case NE_EXPR
: /* - [c, c] */
4455 case EQ_EXPR
: /* + [c, c] */
4456 in_p
= ! in_p
, low
= high
= arg1
;
4458 case GT_EXPR
: /* - [-, c] */
4459 low
= 0, high
= arg1
;
4461 case GE_EXPR
: /* + [c, -] */
4462 in_p
= ! in_p
, low
= arg1
, high
= 0;
4464 case LT_EXPR
: /* - [c, -] */
4465 low
= arg1
, high
= 0;
4467 case LE_EXPR
: /* + [-, c] */
4468 in_p
= ! in_p
, low
= 0, high
= arg1
;
4474 /* If this is an unsigned comparison, we also know that EXP is
4475 greater than or equal to zero. We base the range tests we make
4476 on that fact, so we record it here so we can parse existing
4477 range tests. We test arg0_type since often the return type
4478 of, e.g. EQ_EXPR, is boolean. */
4479 if (TYPE_UNSIGNED (arg0_type
) && (low
== 0 || high
== 0))
4481 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
,
4483 build_int_cst (arg0_type
, 0),
4487 in_p
= n_in_p
, low
= n_low
, high
= n_high
;
4489 /* If the high bound is missing, but we have a nonzero low
4490 bound, reverse the range so it goes from zero to the low bound
4492 if (high
== 0 && low
&& ! integer_zerop (low
))
4495 high
= range_binop (MINUS_EXPR
, NULL_TREE
, low
, 0,
4496 build_int_cst (TREE_TYPE (low
), 1), 0);
4497 low
= build_int_cst (arg0_type
, 0);
4507 /* If flag_wrapv and ARG0_TYPE is signed, make sure
4508 low and high are non-NULL, then normalize will DTRT. */
4509 if (!TYPE_UNSIGNED (arg0_type
)
4510 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
4512 if (low
== NULL_TREE
)
4513 low
= TYPE_MIN_VALUE (arg0_type
);
4514 if (high
== NULL_TREE
)
4515 high
= TYPE_MAX_VALUE (arg0_type
);
4518 /* (-x) IN [a,b] -> x in [-b, -a] */
4519 n_low
= range_binop (MINUS_EXPR
, exp_type
,
4520 build_int_cst (exp_type
, 0),
4522 n_high
= range_binop (MINUS_EXPR
, exp_type
,
4523 build_int_cst (exp_type
, 0),
4525 if (n_high
!= 0 && TREE_OVERFLOW (n_high
))
4531 return build2_loc (loc
, MINUS_EXPR
, exp_type
, negate_expr (arg0
),
4532 build_int_cst (exp_type
, 1));
4536 if (TREE_CODE (arg1
) != INTEGER_CST
)
4539 /* If flag_wrapv and ARG0_TYPE is signed, then we cannot
4540 move a constant to the other side. */
4541 if (!TYPE_UNSIGNED (arg0_type
)
4542 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
4545 /* If EXP is signed, any overflow in the computation is undefined,
4546 so we don't worry about it so long as our computations on
4547 the bounds don't overflow. For unsigned, overflow is defined
4548 and this is exactly the right thing. */
4549 n_low
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
4550 arg0_type
, low
, 0, arg1
, 0);
4551 n_high
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
4552 arg0_type
, high
, 1, arg1
, 0);
4553 if ((n_low
!= 0 && TREE_OVERFLOW (n_low
))
4554 || (n_high
!= 0 && TREE_OVERFLOW (n_high
)))
4557 if (TYPE_OVERFLOW_UNDEFINED (arg0_type
))
4558 *strict_overflow_p
= true;
4561 /* Check for an unsigned range which has wrapped around the maximum
4562 value thus making n_high < n_low, and normalize it. */
4563 if (n_low
&& n_high
&& tree_int_cst_lt (n_high
, n_low
))
4565 low
= range_binop (PLUS_EXPR
, arg0_type
, n_high
, 0,
4566 build_int_cst (TREE_TYPE (n_high
), 1), 0);
4567 high
= range_binop (MINUS_EXPR
, arg0_type
, n_low
, 0,
4568 build_int_cst (TREE_TYPE (n_low
), 1), 0);
4570 /* If the range is of the form +/- [ x+1, x ], we won't
4571 be able to normalize it. But then, it represents the
4572 whole range or the empty set, so make it
4574 if (tree_int_cst_equal (n_low
, low
)
4575 && tree_int_cst_equal (n_high
, high
))
4581 low
= n_low
, high
= n_high
;
4589 case NON_LVALUE_EXPR
:
4590 if (TYPE_PRECISION (arg0_type
) > TYPE_PRECISION (exp_type
))
4593 if (! INTEGRAL_TYPE_P (arg0_type
)
4594 || (low
!= 0 && ! int_fits_type_p (low
, arg0_type
))
4595 || (high
!= 0 && ! int_fits_type_p (high
, arg0_type
)))
4598 n_low
= low
, n_high
= high
;
4601 n_low
= fold_convert_loc (loc
, arg0_type
, n_low
);
4604 n_high
= fold_convert_loc (loc
, arg0_type
, n_high
);
4606 /* If we're converting arg0 from an unsigned type, to exp,
4607 a signed type, we will be doing the comparison as unsigned.
4608 The tests above have already verified that LOW and HIGH
4611 So we have to ensure that we will handle large unsigned
4612 values the same way that the current signed bounds treat
4615 if (!TYPE_UNSIGNED (exp_type
) && TYPE_UNSIGNED (arg0_type
))
4619 /* For fixed-point modes, we need to pass the saturating flag
4620 as the 2nd parameter. */
4621 if (ALL_FIXED_POINT_MODE_P (TYPE_MODE (arg0_type
)))
4623 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
),
4624 TYPE_SATURATING (arg0_type
));
4627 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
), 1);
4629 /* A range without an upper bound is, naturally, unbounded.
4630 Since convert would have cropped a very large value, use
4631 the max value for the destination type. */
4633 = TYPE_MAX_VALUE (equiv_type
) ? TYPE_MAX_VALUE (equiv_type
)
4634 : TYPE_MAX_VALUE (arg0_type
);
4636 if (TYPE_PRECISION (exp_type
) == TYPE_PRECISION (arg0_type
))
4637 high_positive
= fold_build2_loc (loc
, RSHIFT_EXPR
, arg0_type
,
4638 fold_convert_loc (loc
, arg0_type
,
4640 build_int_cst (arg0_type
, 1));
4642 /* If the low bound is specified, "and" the range with the
4643 range for which the original unsigned value will be
4647 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 1, n_low
, n_high
,
4648 1, fold_convert_loc (loc
, arg0_type
,
4653 in_p
= (n_in_p
== in_p
);
4657 /* Otherwise, "or" the range with the range of the input
4658 that will be interpreted as negative. */
4659 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 0, n_low
, n_high
,
4660 1, fold_convert_loc (loc
, arg0_type
,
4665 in_p
= (in_p
!= n_in_p
);
4679 /* Given EXP, a logical expression, set the range it is testing into
4680 variables denoted by PIN_P, PLOW, and PHIGH. Return the expression
4681 actually being tested. *PLOW and *PHIGH will be made of the same
4682 type as the returned expression. If EXP is not a comparison, we
4683 will most likely not be returning a useful value and range. Set
4684 *STRICT_OVERFLOW_P to true if the return value is only valid
4685 because signed overflow is undefined; otherwise, do not change
4686 *STRICT_OVERFLOW_P. */
4689 make_range (tree exp
, int *pin_p
, tree
*plow
, tree
*phigh
,
4690 bool *strict_overflow_p
)
4692 enum tree_code code
;
4693 tree arg0
, arg1
= NULL_TREE
;
4694 tree exp_type
, nexp
;
4697 location_t loc
= EXPR_LOCATION (exp
);
4699 /* Start with simply saying "EXP != 0" and then look at the code of EXP
4700 and see if we can refine the range. Some of the cases below may not
4701 happen, but it doesn't seem worth worrying about this. We "continue"
4702 the outer loop when we've changed something; otherwise we "break"
4703 the switch, which will "break" the while. */
4706 low
= high
= build_int_cst (TREE_TYPE (exp
), 0);
4710 code
= TREE_CODE (exp
);
4711 exp_type
= TREE_TYPE (exp
);
4714 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
)))
4716 if (TREE_OPERAND_LENGTH (exp
) > 0)
4717 arg0
= TREE_OPERAND (exp
, 0);
4718 if (TREE_CODE_CLASS (code
) == tcc_binary
4719 || TREE_CODE_CLASS (code
) == tcc_comparison
4720 || (TREE_CODE_CLASS (code
) == tcc_expression
4721 && TREE_OPERAND_LENGTH (exp
) > 1))
4722 arg1
= TREE_OPERAND (exp
, 1);
4724 if (arg0
== NULL_TREE
)
4727 nexp
= make_range_step (loc
, code
, arg0
, arg1
, exp_type
, &low
,
4728 &high
, &in_p
, strict_overflow_p
);
4729 if (nexp
== NULL_TREE
)
4734 /* If EXP is a constant, we can evaluate whether this is true or false. */
4735 if (TREE_CODE (exp
) == INTEGER_CST
)
4737 in_p
= in_p
== (integer_onep (range_binop (GE_EXPR
, integer_type_node
,
4739 && integer_onep (range_binop (LE_EXPR
, integer_type_node
,
4745 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
4749 /* Given a range, LOW, HIGH, and IN_P, an expression, EXP, and a result
4750 type, TYPE, return an expression to test if EXP is in (or out of, depending
4751 on IN_P) the range. Return 0 if the test couldn't be created. */
4754 build_range_check (location_t loc
, tree type
, tree exp
, int in_p
,
4755 tree low
, tree high
)
4757 tree etype
= TREE_TYPE (exp
), value
;
4759 /* Disable this optimization for function pointer expressions
4760 on targets that require function pointer canonicalization. */
4761 if (targetm
.have_canonicalize_funcptr_for_compare ()
4762 && TREE_CODE (etype
) == POINTER_TYPE
4763 && TREE_CODE (TREE_TYPE (etype
)) == FUNCTION_TYPE
)
4768 value
= build_range_check (loc
, type
, exp
, 1, low
, high
);
4770 return invert_truthvalue_loc (loc
, value
);
4775 if (low
== 0 && high
== 0)
4776 return omit_one_operand_loc (loc
, type
, build_int_cst (type
, 1), exp
);
4779 return fold_build2_loc (loc
, LE_EXPR
, type
, exp
,
4780 fold_convert_loc (loc
, etype
, high
));
4783 return fold_build2_loc (loc
, GE_EXPR
, type
, exp
,
4784 fold_convert_loc (loc
, etype
, low
));
4786 if (operand_equal_p (low
, high
, 0))
4787 return fold_build2_loc (loc
, EQ_EXPR
, type
, exp
,
4788 fold_convert_loc (loc
, etype
, low
));
4790 if (integer_zerop (low
))
4792 if (! TYPE_UNSIGNED (etype
))
4794 etype
= unsigned_type_for (etype
);
4795 high
= fold_convert_loc (loc
, etype
, high
);
4796 exp
= fold_convert_loc (loc
, etype
, exp
);
4798 return build_range_check (loc
, type
, exp
, 1, 0, high
);
4801 /* Optimize (c>=1) && (c<=127) into (signed char)c > 0. */
4802 if (integer_onep (low
) && TREE_CODE (high
) == INTEGER_CST
)
4804 int prec
= TYPE_PRECISION (etype
);
4806 if (wi::mask (prec
- 1, false, prec
) == high
)
4808 if (TYPE_UNSIGNED (etype
))
4810 tree signed_etype
= signed_type_for (etype
);
4811 if (TYPE_PRECISION (signed_etype
) != TYPE_PRECISION (etype
))
4813 = build_nonstandard_integer_type (TYPE_PRECISION (etype
), 0);
4815 etype
= signed_etype
;
4816 exp
= fold_convert_loc (loc
, etype
, exp
);
4818 return fold_build2_loc (loc
, GT_EXPR
, type
, exp
,
4819 build_int_cst (etype
, 0));
4823 /* Optimize (c>=low) && (c<=high) into (c-low>=0) && (c-low<=high-low).
4824 This requires wrap-around arithmetics for the type of the expression.
4825 First make sure that arithmetics in this type is valid, then make sure
4826 that it wraps around. */
4827 if (TREE_CODE (etype
) == ENUMERAL_TYPE
|| TREE_CODE (etype
) == BOOLEAN_TYPE
)
4828 etype
= lang_hooks
.types
.type_for_size (TYPE_PRECISION (etype
),
4829 TYPE_UNSIGNED (etype
));
4831 if (TREE_CODE (etype
) == INTEGER_TYPE
&& !TYPE_OVERFLOW_WRAPS (etype
))
4833 tree utype
, minv
, maxv
;
4835 /* Check if (unsigned) INT_MAX + 1 == (unsigned) INT_MIN
4836 for the type in question, as we rely on this here. */
4837 utype
= unsigned_type_for (etype
);
4838 maxv
= fold_convert_loc (loc
, utype
, TYPE_MAX_VALUE (etype
));
4839 maxv
= range_binop (PLUS_EXPR
, NULL_TREE
, maxv
, 1,
4840 build_int_cst (TREE_TYPE (maxv
), 1), 1);
4841 minv
= fold_convert_loc (loc
, utype
, TYPE_MIN_VALUE (etype
));
4843 if (integer_zerop (range_binop (NE_EXPR
, integer_type_node
,
4850 high
= fold_convert_loc (loc
, etype
, high
);
4851 low
= fold_convert_loc (loc
, etype
, low
);
4852 exp
= fold_convert_loc (loc
, etype
, exp
);
4854 value
= const_binop (MINUS_EXPR
, high
, low
);
4857 if (POINTER_TYPE_P (etype
))
4859 if (value
!= 0 && !TREE_OVERFLOW (value
))
4861 low
= fold_build1_loc (loc
, NEGATE_EXPR
, TREE_TYPE (low
), low
);
4862 return build_range_check (loc
, type
,
4863 fold_build_pointer_plus_loc (loc
, exp
, low
),
4864 1, build_int_cst (etype
, 0), value
);
4869 if (value
!= 0 && !TREE_OVERFLOW (value
))
4870 return build_range_check (loc
, type
,
4871 fold_build2_loc (loc
, MINUS_EXPR
, etype
, exp
, low
),
4872 1, build_int_cst (etype
, 0), value
);
4877 /* Return the predecessor of VAL in its type, handling the infinite case. */
4880 range_predecessor (tree val
)
4882 tree type
= TREE_TYPE (val
);
4884 if (INTEGRAL_TYPE_P (type
)
4885 && operand_equal_p (val
, TYPE_MIN_VALUE (type
), 0))
4888 return range_binop (MINUS_EXPR
, NULL_TREE
, val
, 0,
4889 build_int_cst (TREE_TYPE (val
), 1), 0);
4892 /* Return the successor of VAL in its type, handling the infinite case. */
4895 range_successor (tree val
)
4897 tree type
= TREE_TYPE (val
);
4899 if (INTEGRAL_TYPE_P (type
)
4900 && operand_equal_p (val
, TYPE_MAX_VALUE (type
), 0))
4903 return range_binop (PLUS_EXPR
, NULL_TREE
, val
, 0,
4904 build_int_cst (TREE_TYPE (val
), 1), 0);
4907 /* Given two ranges, see if we can merge them into one. Return 1 if we
4908 can, 0 if we can't. Set the output range into the specified parameters. */
4911 merge_ranges (int *pin_p
, tree
*plow
, tree
*phigh
, int in0_p
, tree low0
,
4912 tree high0
, int in1_p
, tree low1
, tree high1
)
4920 int lowequal
= ((low0
== 0 && low1
== 0)
4921 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
4922 low0
, 0, low1
, 0)));
4923 int highequal
= ((high0
== 0 && high1
== 0)
4924 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
4925 high0
, 1, high1
, 1)));
4927 /* Make range 0 be the range that starts first, or ends last if they
4928 start at the same value. Swap them if it isn't. */
4929 if (integer_onep (range_binop (GT_EXPR
, integer_type_node
,
4932 && integer_onep (range_binop (GT_EXPR
, integer_type_node
,
4933 high1
, 1, high0
, 1))))
4935 temp
= in0_p
, in0_p
= in1_p
, in1_p
= temp
;
4936 tem
= low0
, low0
= low1
, low1
= tem
;
4937 tem
= high0
, high0
= high1
, high1
= tem
;
4940 /* Now flag two cases, whether the ranges are disjoint or whether the
4941 second range is totally subsumed in the first. Note that the tests
4942 below are simplified by the ones above. */
4943 no_overlap
= integer_onep (range_binop (LT_EXPR
, integer_type_node
,
4944 high0
, 1, low1
, 0));
4945 subset
= integer_onep (range_binop (LE_EXPR
, integer_type_node
,
4946 high1
, 1, high0
, 1));
4948 /* We now have four cases, depending on whether we are including or
4949 excluding the two ranges. */
4952 /* If they don't overlap, the result is false. If the second range
4953 is a subset it is the result. Otherwise, the range is from the start
4954 of the second to the end of the first. */
4956 in_p
= 0, low
= high
= 0;
4958 in_p
= 1, low
= low1
, high
= high1
;
4960 in_p
= 1, low
= low1
, high
= high0
;
4963 else if (in0_p
&& ! in1_p
)
4965 /* If they don't overlap, the result is the first range. If they are
4966 equal, the result is false. If the second range is a subset of the
4967 first, and the ranges begin at the same place, we go from just after
4968 the end of the second range to the end of the first. If the second
4969 range is not a subset of the first, or if it is a subset and both
4970 ranges end at the same place, the range starts at the start of the
4971 first range and ends just before the second range.
4972 Otherwise, we can't describe this as a single range. */
4974 in_p
= 1, low
= low0
, high
= high0
;
4975 else if (lowequal
&& highequal
)
4976 in_p
= 0, low
= high
= 0;
4977 else if (subset
&& lowequal
)
4979 low
= range_successor (high1
);
4984 /* We are in the weird situation where high0 > high1 but
4985 high1 has no successor. Punt. */
4989 else if (! subset
|| highequal
)
4992 high
= range_predecessor (low1
);
4996 /* low0 < low1 but low1 has no predecessor. Punt. */
5004 else if (! in0_p
&& in1_p
)
5006 /* If they don't overlap, the result is the second range. If the second
5007 is a subset of the first, the result is false. Otherwise,
5008 the range starts just after the first range and ends at the
5009 end of the second. */
5011 in_p
= 1, low
= low1
, high
= high1
;
5012 else if (subset
|| highequal
)
5013 in_p
= 0, low
= high
= 0;
5016 low
= range_successor (high0
);
5021 /* high1 > high0 but high0 has no successor. Punt. */
5029 /* The case where we are excluding both ranges. Here the complex case
5030 is if they don't overlap. In that case, the only time we have a
5031 range is if they are adjacent. If the second is a subset of the
5032 first, the result is the first. Otherwise, the range to exclude
5033 starts at the beginning of the first range and ends at the end of the
5037 if (integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
5038 range_successor (high0
),
5040 in_p
= 0, low
= low0
, high
= high1
;
5043 /* Canonicalize - [min, x] into - [-, x]. */
5044 if (low0
&& TREE_CODE (low0
) == INTEGER_CST
)
5045 switch (TREE_CODE (TREE_TYPE (low0
)))
5048 if (TYPE_PRECISION (TREE_TYPE (low0
))
5049 != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (low0
))))
5053 if (tree_int_cst_equal (low0
,
5054 TYPE_MIN_VALUE (TREE_TYPE (low0
))))
5058 if (TYPE_UNSIGNED (TREE_TYPE (low0
))
5059 && integer_zerop (low0
))
5066 /* Canonicalize - [x, max] into - [x, -]. */
5067 if (high1
&& TREE_CODE (high1
) == INTEGER_CST
)
5068 switch (TREE_CODE (TREE_TYPE (high1
)))
5071 if (TYPE_PRECISION (TREE_TYPE (high1
))
5072 != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (high1
))))
5076 if (tree_int_cst_equal (high1
,
5077 TYPE_MAX_VALUE (TREE_TYPE (high1
))))
5081 if (TYPE_UNSIGNED (TREE_TYPE (high1
))
5082 && integer_zerop (range_binop (PLUS_EXPR
, NULL_TREE
,
5084 build_int_cst (TREE_TYPE (high1
), 1),
5092 /* The ranges might be also adjacent between the maximum and
5093 minimum values of the given type. For
5094 - [{min,-}, x] and - [y, {max,-}] ranges where x + 1 < y
5095 return + [x + 1, y - 1]. */
5096 if (low0
== 0 && high1
== 0)
5098 low
= range_successor (high0
);
5099 high
= range_predecessor (low1
);
5100 if (low
== 0 || high
== 0)
5110 in_p
= 0, low
= low0
, high
= high0
;
5112 in_p
= 0, low
= low0
, high
= high1
;
5115 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
5120 /* Subroutine of fold, looking inside expressions of the form
5121 A op B ? A : C, where ARG0, ARG1 and ARG2 are the three operands
5122 of the COND_EXPR. This function is being used also to optimize
5123 A op B ? C : A, by reversing the comparison first.
5125 Return a folded expression whose code is not a COND_EXPR
5126 anymore, or NULL_TREE if no folding opportunity is found. */
5129 fold_cond_expr_with_comparison (location_t loc
, tree type
,
5130 tree arg0
, tree arg1
, tree arg2
)
5132 enum tree_code comp_code
= TREE_CODE (arg0
);
5133 tree arg00
= TREE_OPERAND (arg0
, 0);
5134 tree arg01
= TREE_OPERAND (arg0
, 1);
5135 tree arg1_type
= TREE_TYPE (arg1
);
5141 /* If we have A op 0 ? A : -A, consider applying the following
5144 A == 0? A : -A same as -A
5145 A != 0? A : -A same as A
5146 A >= 0? A : -A same as abs (A)
5147 A > 0? A : -A same as abs (A)
5148 A <= 0? A : -A same as -abs (A)
5149 A < 0? A : -A same as -abs (A)
5151 None of these transformations work for modes with signed
5152 zeros. If A is +/-0, the first two transformations will
5153 change the sign of the result (from +0 to -0, or vice
5154 versa). The last four will fix the sign of the result,
5155 even though the original expressions could be positive or
5156 negative, depending on the sign of A.
5158 Note that all these transformations are correct if A is
5159 NaN, since the two alternatives (A and -A) are also NaNs. */
5160 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5161 && (FLOAT_TYPE_P (TREE_TYPE (arg01
))
5162 ? real_zerop (arg01
)
5163 : integer_zerop (arg01
))
5164 && ((TREE_CODE (arg2
) == NEGATE_EXPR
5165 && operand_equal_p (TREE_OPERAND (arg2
, 0), arg1
, 0))
5166 /* In the case that A is of the form X-Y, '-A' (arg2) may
5167 have already been folded to Y-X, check for that. */
5168 || (TREE_CODE (arg1
) == MINUS_EXPR
5169 && TREE_CODE (arg2
) == MINUS_EXPR
5170 && operand_equal_p (TREE_OPERAND (arg1
, 0),
5171 TREE_OPERAND (arg2
, 1), 0)
5172 && operand_equal_p (TREE_OPERAND (arg1
, 1),
5173 TREE_OPERAND (arg2
, 0), 0))))
5178 tem
= fold_convert_loc (loc
, arg1_type
, arg1
);
5179 return fold_convert_loc (loc
, type
, negate_expr (tem
));
5182 return fold_convert_loc (loc
, type
, arg1
);
5185 if (flag_trapping_math
)
5190 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
5192 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
5193 return fold_convert_loc (loc
, type
, tem
);
5196 if (flag_trapping_math
)
5201 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
5203 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
5204 return negate_expr (fold_convert_loc (loc
, type
, tem
));
5206 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
5210 /* A != 0 ? A : 0 is simply A, unless A is -0. Likewise
5211 A == 0 ? A : 0 is always 0 unless A is -0. Note that
5212 both transformations are correct when A is NaN: A != 0
5213 is then true, and A == 0 is false. */
5215 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5216 && integer_zerop (arg01
) && integer_zerop (arg2
))
5218 if (comp_code
== NE_EXPR
)
5219 return fold_convert_loc (loc
, type
, arg1
);
5220 else if (comp_code
== EQ_EXPR
)
5221 return build_zero_cst (type
);
5224 /* Try some transformations of A op B ? A : B.
5226 A == B? A : B same as B
5227 A != B? A : B same as A
5228 A >= B? A : B same as max (A, B)
5229 A > B? A : B same as max (B, A)
5230 A <= B? A : B same as min (A, B)
5231 A < B? A : B same as min (B, A)
5233 As above, these transformations don't work in the presence
5234 of signed zeros. For example, if A and B are zeros of
5235 opposite sign, the first two transformations will change
5236 the sign of the result. In the last four, the original
5237 expressions give different results for (A=+0, B=-0) and
5238 (A=-0, B=+0), but the transformed expressions do not.
5240 The first two transformations are correct if either A or B
5241 is a NaN. In the first transformation, the condition will
5242 be false, and B will indeed be chosen. In the case of the
5243 second transformation, the condition A != B will be true,
5244 and A will be chosen.
5246 The conversions to max() and min() are not correct if B is
5247 a number and A is not. The conditions in the original
5248 expressions will be false, so all four give B. The min()
5249 and max() versions would give a NaN instead. */
5250 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5251 && operand_equal_for_comparison_p (arg01
, arg2
, arg00
)
5252 /* Avoid these transformations if the COND_EXPR may be used
5253 as an lvalue in the C++ front-end. PR c++/19199. */
5255 || VECTOR_TYPE_P (type
)
5256 || (! lang_GNU_CXX ()
5257 && strcmp (lang_hooks
.name
, "GNU Objective-C++") != 0)
5258 || ! maybe_lvalue_p (arg1
)
5259 || ! maybe_lvalue_p (arg2
)))
5261 tree comp_op0
= arg00
;
5262 tree comp_op1
= arg01
;
5263 tree comp_type
= TREE_TYPE (comp_op0
);
5268 return fold_convert_loc (loc
, type
, arg2
);
5270 return fold_convert_loc (loc
, type
, arg1
);
5275 /* In C++ a ?: expression can be an lvalue, so put the
5276 operand which will be used if they are equal first
5277 so that we can convert this back to the
5278 corresponding COND_EXPR. */
5279 if (!HONOR_NANS (arg1
))
5281 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5282 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5283 tem
= (comp_code
== LE_EXPR
|| comp_code
== UNLE_EXPR
)
5284 ? fold_build2_loc (loc
, MIN_EXPR
, comp_type
, comp_op0
, comp_op1
)
5285 : fold_build2_loc (loc
, MIN_EXPR
, comp_type
,
5286 comp_op1
, comp_op0
);
5287 return fold_convert_loc (loc
, type
, tem
);
5294 if (!HONOR_NANS (arg1
))
5296 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5297 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5298 tem
= (comp_code
== GE_EXPR
|| comp_code
== UNGE_EXPR
)
5299 ? fold_build2_loc (loc
, MAX_EXPR
, comp_type
, comp_op0
, comp_op1
)
5300 : fold_build2_loc (loc
, MAX_EXPR
, comp_type
,
5301 comp_op1
, comp_op0
);
5302 return fold_convert_loc (loc
, type
, tem
);
5306 if (!HONOR_NANS (arg1
))
5307 return fold_convert_loc (loc
, type
, arg2
);
5310 if (!HONOR_NANS (arg1
))
5311 return fold_convert_loc (loc
, type
, arg1
);
5314 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
5324 #ifndef LOGICAL_OP_NON_SHORT_CIRCUIT
5325 #define LOGICAL_OP_NON_SHORT_CIRCUIT \
5326 (BRANCH_COST (optimize_function_for_speed_p (cfun), \
5330 /* EXP is some logical combination of boolean tests. See if we can
5331 merge it into some range test. Return the new tree if so. */
5334 fold_range_test (location_t loc
, enum tree_code code
, tree type
,
5337 int or_op
= (code
== TRUTH_ORIF_EXPR
5338 || code
== TRUTH_OR_EXPR
);
5339 int in0_p
, in1_p
, in_p
;
5340 tree low0
, low1
, low
, high0
, high1
, high
;
5341 bool strict_overflow_p
= false;
5343 const char * const warnmsg
= G_("assuming signed overflow does not occur "
5344 "when simplifying range test");
5346 if (!INTEGRAL_TYPE_P (type
))
5349 lhs
= make_range (op0
, &in0_p
, &low0
, &high0
, &strict_overflow_p
);
5350 rhs
= make_range (op1
, &in1_p
, &low1
, &high1
, &strict_overflow_p
);
5352 /* If this is an OR operation, invert both sides; we will invert
5353 again at the end. */
5355 in0_p
= ! in0_p
, in1_p
= ! in1_p
;
5357 /* If both expressions are the same, if we can merge the ranges, and we
5358 can build the range test, return it or it inverted. If one of the
5359 ranges is always true or always false, consider it to be the same
5360 expression as the other. */
5361 if ((lhs
== 0 || rhs
== 0 || operand_equal_p (lhs
, rhs
, 0))
5362 && merge_ranges (&in_p
, &low
, &high
, in0_p
, low0
, high0
,
5364 && 0 != (tem
= (build_range_check (loc
, type
,
5366 : rhs
!= 0 ? rhs
: integer_zero_node
,
5369 if (strict_overflow_p
)
5370 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
5371 return or_op
? invert_truthvalue_loc (loc
, tem
) : tem
;
5374 /* On machines where the branch cost is expensive, if this is a
5375 short-circuited branch and the underlying object on both sides
5376 is the same, make a non-short-circuit operation. */
5377 else if (LOGICAL_OP_NON_SHORT_CIRCUIT
5378 && lhs
!= 0 && rhs
!= 0
5379 && (code
== TRUTH_ANDIF_EXPR
5380 || code
== TRUTH_ORIF_EXPR
)
5381 && operand_equal_p (lhs
, rhs
, 0))
5383 /* If simple enough, just rewrite. Otherwise, make a SAVE_EXPR
5384 unless we are at top level or LHS contains a PLACEHOLDER_EXPR, in
5385 which cases we can't do this. */
5386 if (simple_operand_p (lhs
))
5387 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5388 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5391 else if (!lang_hooks
.decls
.global_bindings_p ()
5392 && !CONTAINS_PLACEHOLDER_P (lhs
))
5394 tree common
= save_expr (lhs
);
5396 if (0 != (lhs
= build_range_check (loc
, type
, common
,
5397 or_op
? ! in0_p
: in0_p
,
5399 && (0 != (rhs
= build_range_check (loc
, type
, common
,
5400 or_op
? ! in1_p
: in1_p
,
5403 if (strict_overflow_p
)
5404 fold_overflow_warning (warnmsg
,
5405 WARN_STRICT_OVERFLOW_COMPARISON
);
5406 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5407 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5416 /* Subroutine for fold_truth_andor_1: C is an INTEGER_CST interpreted as a P
5417 bit value. Arrange things so the extra bits will be set to zero if and
5418 only if C is signed-extended to its full width. If MASK is nonzero,
5419 it is an INTEGER_CST that should be AND'ed with the extra bits. */
5422 unextend (tree c
, int p
, int unsignedp
, tree mask
)
5424 tree type
= TREE_TYPE (c
);
5425 int modesize
= GET_MODE_BITSIZE (TYPE_MODE (type
));
5428 if (p
== modesize
|| unsignedp
)
5431 /* We work by getting just the sign bit into the low-order bit, then
5432 into the high-order bit, then sign-extend. We then XOR that value
5434 temp
= build_int_cst (TREE_TYPE (c
), wi::extract_uhwi (c
, p
- 1, 1));
5436 /* We must use a signed type in order to get an arithmetic right shift.
5437 However, we must also avoid introducing accidental overflows, so that
5438 a subsequent call to integer_zerop will work. Hence we must
5439 do the type conversion here. At this point, the constant is either
5440 zero or one, and the conversion to a signed type can never overflow.
5441 We could get an overflow if this conversion is done anywhere else. */
5442 if (TYPE_UNSIGNED (type
))
5443 temp
= fold_convert (signed_type_for (type
), temp
);
5445 temp
= const_binop (LSHIFT_EXPR
, temp
, size_int (modesize
- 1));
5446 temp
= const_binop (RSHIFT_EXPR
, temp
, size_int (modesize
- p
- 1));
5448 temp
= const_binop (BIT_AND_EXPR
, temp
,
5449 fold_convert (TREE_TYPE (c
), mask
));
5450 /* If necessary, convert the type back to match the type of C. */
5451 if (TYPE_UNSIGNED (type
))
5452 temp
= fold_convert (type
, temp
);
5454 return fold_convert (type
, const_binop (BIT_XOR_EXPR
, c
, temp
));
5457 /* For an expression that has the form
5461 we can drop one of the inner expressions and simplify to
5465 LOC is the location of the resulting expression. OP is the inner
5466 logical operation; the left-hand side in the examples above, while CMPOP
5467 is the right-hand side. RHS_ONLY is used to prevent us from accidentally
5468 removing a condition that guards another, as in
5469 (A != NULL && A->...) || A == NULL
5470 which we must not transform. If RHS_ONLY is true, only eliminate the
5471 right-most operand of the inner logical operation. */
5474 merge_truthop_with_opposite_arm (location_t loc
, tree op
, tree cmpop
,
5477 tree type
= TREE_TYPE (cmpop
);
5478 enum tree_code code
= TREE_CODE (cmpop
);
5479 enum tree_code truthop_code
= TREE_CODE (op
);
5480 tree lhs
= TREE_OPERAND (op
, 0);
5481 tree rhs
= TREE_OPERAND (op
, 1);
5482 tree orig_lhs
= lhs
, orig_rhs
= rhs
;
5483 enum tree_code rhs_code
= TREE_CODE (rhs
);
5484 enum tree_code lhs_code
= TREE_CODE (lhs
);
5485 enum tree_code inv_code
;
5487 if (TREE_SIDE_EFFECTS (op
) || TREE_SIDE_EFFECTS (cmpop
))
5490 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
5493 if (rhs_code
== truthop_code
)
5495 tree newrhs
= merge_truthop_with_opposite_arm (loc
, rhs
, cmpop
, rhs_only
);
5496 if (newrhs
!= NULL_TREE
)
5499 rhs_code
= TREE_CODE (rhs
);
5502 if (lhs_code
== truthop_code
&& !rhs_only
)
5504 tree newlhs
= merge_truthop_with_opposite_arm (loc
, lhs
, cmpop
, false);
5505 if (newlhs
!= NULL_TREE
)
5508 lhs_code
= TREE_CODE (lhs
);
5512 inv_code
= invert_tree_comparison (code
, HONOR_NANS (type
));
5513 if (inv_code
== rhs_code
5514 && operand_equal_p (TREE_OPERAND (rhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
5515 && operand_equal_p (TREE_OPERAND (rhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
5517 if (!rhs_only
&& inv_code
== lhs_code
5518 && operand_equal_p (TREE_OPERAND (lhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
5519 && operand_equal_p (TREE_OPERAND (lhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
5521 if (rhs
!= orig_rhs
|| lhs
!= orig_lhs
)
5522 return fold_build2_loc (loc
, truthop_code
, TREE_TYPE (cmpop
),
5527 /* Find ways of folding logical expressions of LHS and RHS:
5528 Try to merge two comparisons to the same innermost item.
5529 Look for range tests like "ch >= '0' && ch <= '9'".
5530 Look for combinations of simple terms on machines with expensive branches
5531 and evaluate the RHS unconditionally.
5533 For example, if we have p->a == 2 && p->b == 4 and we can make an
5534 object large enough to span both A and B, we can do this with a comparison
5535 against the object ANDed with the a mask.
5537 If we have p->a == q->a && p->b == q->b, we may be able to use bit masking
5538 operations to do this with one comparison.
5540 We check for both normal comparisons and the BIT_AND_EXPRs made this by
5541 function and the one above.
5543 CODE is the logical operation being done. It can be TRUTH_ANDIF_EXPR,
5544 TRUTH_AND_EXPR, TRUTH_ORIF_EXPR, or TRUTH_OR_EXPR.
5546 TRUTH_TYPE is the type of the logical operand and LHS and RHS are its
5549 We return the simplified tree or 0 if no optimization is possible. */
5552 fold_truth_andor_1 (location_t loc
, enum tree_code code
, tree truth_type
,
5555 /* If this is the "or" of two comparisons, we can do something if
5556 the comparisons are NE_EXPR. If this is the "and", we can do something
5557 if the comparisons are EQ_EXPR. I.e.,
5558 (a->b == 2 && a->c == 4) can become (a->new == NEW).
5560 WANTED_CODE is this operation code. For single bit fields, we can
5561 convert EQ_EXPR to NE_EXPR so we need not reject the "wrong"
5562 comparison for one-bit fields. */
5564 enum tree_code wanted_code
;
5565 enum tree_code lcode
, rcode
;
5566 tree ll_arg
, lr_arg
, rl_arg
, rr_arg
;
5567 tree ll_inner
, lr_inner
, rl_inner
, rr_inner
;
5568 HOST_WIDE_INT ll_bitsize
, ll_bitpos
, lr_bitsize
, lr_bitpos
;
5569 HOST_WIDE_INT rl_bitsize
, rl_bitpos
, rr_bitsize
, rr_bitpos
;
5570 HOST_WIDE_INT xll_bitpos
, xlr_bitpos
, xrl_bitpos
, xrr_bitpos
;
5571 HOST_WIDE_INT lnbitsize
, lnbitpos
, rnbitsize
, rnbitpos
;
5572 int ll_unsignedp
, lr_unsignedp
, rl_unsignedp
, rr_unsignedp
;
5573 int ll_reversep
, lr_reversep
, rl_reversep
, rr_reversep
;
5574 machine_mode ll_mode
, lr_mode
, rl_mode
, rr_mode
;
5575 machine_mode lnmode
, rnmode
;
5576 tree ll_mask
, lr_mask
, rl_mask
, rr_mask
;
5577 tree ll_and_mask
, lr_and_mask
, rl_and_mask
, rr_and_mask
;
5578 tree l_const
, r_const
;
5579 tree lntype
, rntype
, result
;
5580 HOST_WIDE_INT first_bit
, end_bit
;
5583 /* Start by getting the comparison codes. Fail if anything is volatile.
5584 If one operand is a BIT_AND_EXPR with the constant one, treat it as if
5585 it were surrounded with a NE_EXPR. */
5587 if (TREE_SIDE_EFFECTS (lhs
) || TREE_SIDE_EFFECTS (rhs
))
5590 lcode
= TREE_CODE (lhs
);
5591 rcode
= TREE_CODE (rhs
);
5593 if (lcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (lhs
, 1)))
5595 lhs
= build2 (NE_EXPR
, truth_type
, lhs
,
5596 build_int_cst (TREE_TYPE (lhs
), 0));
5600 if (rcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (rhs
, 1)))
5602 rhs
= build2 (NE_EXPR
, truth_type
, rhs
,
5603 build_int_cst (TREE_TYPE (rhs
), 0));
5607 if (TREE_CODE_CLASS (lcode
) != tcc_comparison
5608 || TREE_CODE_CLASS (rcode
) != tcc_comparison
)
5611 ll_arg
= TREE_OPERAND (lhs
, 0);
5612 lr_arg
= TREE_OPERAND (lhs
, 1);
5613 rl_arg
= TREE_OPERAND (rhs
, 0);
5614 rr_arg
= TREE_OPERAND (rhs
, 1);
5616 /* Simplify (x<y) && (x==y) into (x<=y) and related optimizations. */
5617 if (simple_operand_p (ll_arg
)
5618 && simple_operand_p (lr_arg
))
5620 if (operand_equal_p (ll_arg
, rl_arg
, 0)
5621 && operand_equal_p (lr_arg
, rr_arg
, 0))
5623 result
= combine_comparisons (loc
, code
, lcode
, rcode
,
5624 truth_type
, ll_arg
, lr_arg
);
5628 else if (operand_equal_p (ll_arg
, rr_arg
, 0)
5629 && operand_equal_p (lr_arg
, rl_arg
, 0))
5631 result
= combine_comparisons (loc
, code
, lcode
,
5632 swap_tree_comparison (rcode
),
5633 truth_type
, ll_arg
, lr_arg
);
5639 code
= ((code
== TRUTH_AND_EXPR
|| code
== TRUTH_ANDIF_EXPR
)
5640 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
);
5642 /* If the RHS can be evaluated unconditionally and its operands are
5643 simple, it wins to evaluate the RHS unconditionally on machines
5644 with expensive branches. In this case, this isn't a comparison
5645 that can be merged. */
5647 if (BRANCH_COST (optimize_function_for_speed_p (cfun
),
5649 && ! FLOAT_TYPE_P (TREE_TYPE (rl_arg
))
5650 && simple_operand_p (rl_arg
)
5651 && simple_operand_p (rr_arg
))
5653 /* Convert (a != 0) || (b != 0) into (a | b) != 0. */
5654 if (code
== TRUTH_OR_EXPR
5655 && lcode
== NE_EXPR
&& integer_zerop (lr_arg
)
5656 && rcode
== NE_EXPR
&& integer_zerop (rr_arg
)
5657 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
5658 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
5659 return build2_loc (loc
, NE_EXPR
, truth_type
,
5660 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
5662 build_int_cst (TREE_TYPE (ll_arg
), 0));
5664 /* Convert (a == 0) && (b == 0) into (a | b) == 0. */
5665 if (code
== TRUTH_AND_EXPR
5666 && lcode
== EQ_EXPR
&& integer_zerop (lr_arg
)
5667 && rcode
== EQ_EXPR
&& integer_zerop (rr_arg
)
5668 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
5669 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
5670 return build2_loc (loc
, EQ_EXPR
, truth_type
,
5671 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
5673 build_int_cst (TREE_TYPE (ll_arg
), 0));
5676 /* See if the comparisons can be merged. Then get all the parameters for
5679 if ((lcode
!= EQ_EXPR
&& lcode
!= NE_EXPR
)
5680 || (rcode
!= EQ_EXPR
&& rcode
!= NE_EXPR
))
5683 ll_reversep
= lr_reversep
= rl_reversep
= rr_reversep
= 0;
5685 ll_inner
= decode_field_reference (loc
, &ll_arg
,
5686 &ll_bitsize
, &ll_bitpos
, &ll_mode
,
5687 &ll_unsignedp
, &ll_reversep
, &volatilep
,
5688 &ll_mask
, &ll_and_mask
);
5689 lr_inner
= decode_field_reference (loc
, &lr_arg
,
5690 &lr_bitsize
, &lr_bitpos
, &lr_mode
,
5691 &lr_unsignedp
, &lr_reversep
, &volatilep
,
5692 &lr_mask
, &lr_and_mask
);
5693 rl_inner
= decode_field_reference (loc
, &rl_arg
,
5694 &rl_bitsize
, &rl_bitpos
, &rl_mode
,
5695 &rl_unsignedp
, &rl_reversep
, &volatilep
,
5696 &rl_mask
, &rl_and_mask
);
5697 rr_inner
= decode_field_reference (loc
, &rr_arg
,
5698 &rr_bitsize
, &rr_bitpos
, &rr_mode
,
5699 &rr_unsignedp
, &rr_reversep
, &volatilep
,
5700 &rr_mask
, &rr_and_mask
);
5702 /* It must be true that the inner operation on the lhs of each
5703 comparison must be the same if we are to be able to do anything.
5704 Then see if we have constants. If not, the same must be true for
5707 || ll_reversep
!= rl_reversep
5708 || ll_inner
== 0 || rl_inner
== 0
5709 || ! operand_equal_p (ll_inner
, rl_inner
, 0))
5712 if (TREE_CODE (lr_arg
) == INTEGER_CST
5713 && TREE_CODE (rr_arg
) == INTEGER_CST
)
5715 l_const
= lr_arg
, r_const
= rr_arg
;
5716 lr_reversep
= ll_reversep
;
5718 else if (lr_reversep
!= rr_reversep
5719 || lr_inner
== 0 || rr_inner
== 0
5720 || ! operand_equal_p (lr_inner
, rr_inner
, 0))
5723 l_const
= r_const
= 0;
5725 /* If either comparison code is not correct for our logical operation,
5726 fail. However, we can convert a one-bit comparison against zero into
5727 the opposite comparison against that bit being set in the field. */
5729 wanted_code
= (code
== TRUTH_AND_EXPR
? EQ_EXPR
: NE_EXPR
);
5730 if (lcode
!= wanted_code
)
5732 if (l_const
&& integer_zerop (l_const
) && integer_pow2p (ll_mask
))
5734 /* Make the left operand unsigned, since we are only interested
5735 in the value of one bit. Otherwise we are doing the wrong
5744 /* This is analogous to the code for l_const above. */
5745 if (rcode
!= wanted_code
)
5747 if (r_const
&& integer_zerop (r_const
) && integer_pow2p (rl_mask
))
5756 /* See if we can find a mode that contains both fields being compared on
5757 the left. If we can't, fail. Otherwise, update all constants and masks
5758 to be relative to a field of that size. */
5759 first_bit
= MIN (ll_bitpos
, rl_bitpos
);
5760 end_bit
= MAX (ll_bitpos
+ ll_bitsize
, rl_bitpos
+ rl_bitsize
);
5761 lnmode
= get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
5762 TYPE_ALIGN (TREE_TYPE (ll_inner
)), word_mode
,
5764 if (lnmode
== VOIDmode
)
5767 lnbitsize
= GET_MODE_BITSIZE (lnmode
);
5768 lnbitpos
= first_bit
& ~ (lnbitsize
- 1);
5769 lntype
= lang_hooks
.types
.type_for_size (lnbitsize
, 1);
5770 xll_bitpos
= ll_bitpos
- lnbitpos
, xrl_bitpos
= rl_bitpos
- lnbitpos
;
5772 if (ll_reversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5774 xll_bitpos
= lnbitsize
- xll_bitpos
- ll_bitsize
;
5775 xrl_bitpos
= lnbitsize
- xrl_bitpos
- rl_bitsize
;
5778 ll_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, ll_mask
),
5779 size_int (xll_bitpos
));
5780 rl_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, rl_mask
),
5781 size_int (xrl_bitpos
));
5785 l_const
= fold_convert_loc (loc
, lntype
, l_const
);
5786 l_const
= unextend (l_const
, ll_bitsize
, ll_unsignedp
, ll_and_mask
);
5787 l_const
= const_binop (LSHIFT_EXPR
, l_const
, size_int (xll_bitpos
));
5788 if (! integer_zerop (const_binop (BIT_AND_EXPR
, l_const
,
5789 fold_build1_loc (loc
, BIT_NOT_EXPR
,
5792 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
5794 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
5799 r_const
= fold_convert_loc (loc
, lntype
, r_const
);
5800 r_const
= unextend (r_const
, rl_bitsize
, rl_unsignedp
, rl_and_mask
);
5801 r_const
= const_binop (LSHIFT_EXPR
, r_const
, size_int (xrl_bitpos
));
5802 if (! integer_zerop (const_binop (BIT_AND_EXPR
, r_const
,
5803 fold_build1_loc (loc
, BIT_NOT_EXPR
,
5806 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
5808 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
5812 /* If the right sides are not constant, do the same for it. Also,
5813 disallow this optimization if a size or signedness mismatch occurs
5814 between the left and right sides. */
5817 if (ll_bitsize
!= lr_bitsize
|| rl_bitsize
!= rr_bitsize
5818 || ll_unsignedp
!= lr_unsignedp
|| rl_unsignedp
!= rr_unsignedp
5819 /* Make sure the two fields on the right
5820 correspond to the left without being swapped. */
5821 || ll_bitpos
- rl_bitpos
!= lr_bitpos
- rr_bitpos
)
5824 first_bit
= MIN (lr_bitpos
, rr_bitpos
);
5825 end_bit
= MAX (lr_bitpos
+ lr_bitsize
, rr_bitpos
+ rr_bitsize
);
5826 rnmode
= get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
5827 TYPE_ALIGN (TREE_TYPE (lr_inner
)), word_mode
,
5829 if (rnmode
== VOIDmode
)
5832 rnbitsize
= GET_MODE_BITSIZE (rnmode
);
5833 rnbitpos
= first_bit
& ~ (rnbitsize
- 1);
5834 rntype
= lang_hooks
.types
.type_for_size (rnbitsize
, 1);
5835 xlr_bitpos
= lr_bitpos
- rnbitpos
, xrr_bitpos
= rr_bitpos
- rnbitpos
;
5837 if (lr_reversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5839 xlr_bitpos
= rnbitsize
- xlr_bitpos
- lr_bitsize
;
5840 xrr_bitpos
= rnbitsize
- xrr_bitpos
- rr_bitsize
;
5843 lr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
5845 size_int (xlr_bitpos
));
5846 rr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
5848 size_int (xrr_bitpos
));
5850 /* Make a mask that corresponds to both fields being compared.
5851 Do this for both items being compared. If the operands are the
5852 same size and the bits being compared are in the same position
5853 then we can do this by masking both and comparing the masked
5855 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
5856 lr_mask
= const_binop (BIT_IOR_EXPR
, lr_mask
, rr_mask
);
5857 if (lnbitsize
== rnbitsize
&& xll_bitpos
== xlr_bitpos
)
5859 lhs
= make_bit_field_ref (loc
, ll_inner
, ll_arg
,
5860 lntype
, lnbitsize
, lnbitpos
,
5861 ll_unsignedp
|| rl_unsignedp
, ll_reversep
);
5862 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
5863 lhs
= build2 (BIT_AND_EXPR
, lntype
, lhs
, ll_mask
);
5865 rhs
= make_bit_field_ref (loc
, lr_inner
, lr_arg
,
5866 rntype
, rnbitsize
, rnbitpos
,
5867 lr_unsignedp
|| rr_unsignedp
, lr_reversep
);
5868 if (! all_ones_mask_p (lr_mask
, rnbitsize
))
5869 rhs
= build2 (BIT_AND_EXPR
, rntype
, rhs
, lr_mask
);
5871 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
5874 /* There is still another way we can do something: If both pairs of
5875 fields being compared are adjacent, we may be able to make a wider
5876 field containing them both.
5878 Note that we still must mask the lhs/rhs expressions. Furthermore,
5879 the mask must be shifted to account for the shift done by
5880 make_bit_field_ref. */
5881 if ((ll_bitsize
+ ll_bitpos
== rl_bitpos
5882 && lr_bitsize
+ lr_bitpos
== rr_bitpos
)
5883 || (ll_bitpos
== rl_bitpos
+ rl_bitsize
5884 && lr_bitpos
== rr_bitpos
+ rr_bitsize
))
5888 lhs
= make_bit_field_ref (loc
, ll_inner
, ll_arg
, lntype
,
5889 ll_bitsize
+ rl_bitsize
,
5890 MIN (ll_bitpos
, rl_bitpos
),
5891 ll_unsignedp
, ll_reversep
);
5892 rhs
= make_bit_field_ref (loc
, lr_inner
, lr_arg
, rntype
,
5893 lr_bitsize
+ rr_bitsize
,
5894 MIN (lr_bitpos
, rr_bitpos
),
5895 lr_unsignedp
, lr_reversep
);
5897 ll_mask
= const_binop (RSHIFT_EXPR
, ll_mask
,
5898 size_int (MIN (xll_bitpos
, xrl_bitpos
)));
5899 lr_mask
= const_binop (RSHIFT_EXPR
, lr_mask
,
5900 size_int (MIN (xlr_bitpos
, xrr_bitpos
)));
5902 /* Convert to the smaller type before masking out unwanted bits. */
5904 if (lntype
!= rntype
)
5906 if (lnbitsize
> rnbitsize
)
5908 lhs
= fold_convert_loc (loc
, rntype
, lhs
);
5909 ll_mask
= fold_convert_loc (loc
, rntype
, ll_mask
);
5912 else if (lnbitsize
< rnbitsize
)
5914 rhs
= fold_convert_loc (loc
, lntype
, rhs
);
5915 lr_mask
= fold_convert_loc (loc
, lntype
, lr_mask
);
5920 if (! all_ones_mask_p (ll_mask
, ll_bitsize
+ rl_bitsize
))
5921 lhs
= build2 (BIT_AND_EXPR
, type
, lhs
, ll_mask
);
5923 if (! all_ones_mask_p (lr_mask
, lr_bitsize
+ rr_bitsize
))
5924 rhs
= build2 (BIT_AND_EXPR
, type
, rhs
, lr_mask
);
5926 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
5932 /* Handle the case of comparisons with constants. If there is something in
5933 common between the masks, those bits of the constants must be the same.
5934 If not, the condition is always false. Test for this to avoid generating
5935 incorrect code below. */
5936 result
= const_binop (BIT_AND_EXPR
, ll_mask
, rl_mask
);
5937 if (! integer_zerop (result
)
5938 && simple_cst_equal (const_binop (BIT_AND_EXPR
, result
, l_const
),
5939 const_binop (BIT_AND_EXPR
, result
, r_const
)) != 1)
5941 if (wanted_code
== NE_EXPR
)
5943 warning (0, "%<or%> of unmatched not-equal tests is always 1");
5944 return constant_boolean_node (true, truth_type
);
5948 warning (0, "%<and%> of mutually exclusive equal-tests is always 0");
5949 return constant_boolean_node (false, truth_type
);
5953 /* Construct the expression we will return. First get the component
5954 reference we will make. Unless the mask is all ones the width of
5955 that field, perform the mask operation. Then compare with the
5957 result
= make_bit_field_ref (loc
, ll_inner
, ll_arg
,
5958 lntype
, lnbitsize
, lnbitpos
,
5959 ll_unsignedp
|| rl_unsignedp
, ll_reversep
);
5961 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
5962 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
5963 result
= build2_loc (loc
, BIT_AND_EXPR
, lntype
, result
, ll_mask
);
5965 return build2_loc (loc
, wanted_code
, truth_type
, result
,
5966 const_binop (BIT_IOR_EXPR
, l_const
, r_const
));
5969 /* T is an integer expression that is being multiplied, divided, or taken a
5970 modulus (CODE says which and what kind of divide or modulus) by a
5971 constant C. See if we can eliminate that operation by folding it with
5972 other operations already in T. WIDE_TYPE, if non-null, is a type that
5973 should be used for the computation if wider than our type.
5975 For example, if we are dividing (X * 8) + (Y * 16) by 4, we can return
5976 (X * 2) + (Y * 4). We must, however, be assured that either the original
5977 expression would not overflow or that overflow is undefined for the type
5978 in the language in question.
5980 If we return a non-null expression, it is an equivalent form of the
5981 original computation, but need not be in the original type.
5983 We set *STRICT_OVERFLOW_P to true if the return values depends on
5984 signed overflow being undefined. Otherwise we do not change
5985 *STRICT_OVERFLOW_P. */
5988 extract_muldiv (tree t
, tree c
, enum tree_code code
, tree wide_type
,
5989 bool *strict_overflow_p
)
5991 /* To avoid exponential search depth, refuse to allow recursion past
5992 three levels. Beyond that (1) it's highly unlikely that we'll find
5993 something interesting and (2) we've probably processed it before
5994 when we built the inner expression. */
6003 ret
= extract_muldiv_1 (t
, c
, code
, wide_type
, strict_overflow_p
);
6010 extract_muldiv_1 (tree t
, tree c
, enum tree_code code
, tree wide_type
,
6011 bool *strict_overflow_p
)
6013 tree type
= TREE_TYPE (t
);
6014 enum tree_code tcode
= TREE_CODE (t
);
6015 tree ctype
= (wide_type
!= 0 && (GET_MODE_SIZE (TYPE_MODE (wide_type
))
6016 > GET_MODE_SIZE (TYPE_MODE (type
)))
6017 ? wide_type
: type
);
6019 int same_p
= tcode
== code
;
6020 tree op0
= NULL_TREE
, op1
= NULL_TREE
;
6021 bool sub_strict_overflow_p
;
6023 /* Don't deal with constants of zero here; they confuse the code below. */
6024 if (integer_zerop (c
))
6027 if (TREE_CODE_CLASS (tcode
) == tcc_unary
)
6028 op0
= TREE_OPERAND (t
, 0);
6030 if (TREE_CODE_CLASS (tcode
) == tcc_binary
)
6031 op0
= TREE_OPERAND (t
, 0), op1
= TREE_OPERAND (t
, 1);
6033 /* Note that we need not handle conditional operations here since fold
6034 already handles those cases. So just do arithmetic here. */
6038 /* For a constant, we can always simplify if we are a multiply
6039 or (for divide and modulus) if it is a multiple of our constant. */
6040 if (code
== MULT_EXPR
6041 || wi::multiple_of_p (t
, c
, TYPE_SIGN (type
)))
6043 tree tem
= const_binop (code
, fold_convert (ctype
, t
),
6044 fold_convert (ctype
, c
));
6045 /* If the multiplication overflowed, we lost information on it.
6046 See PR68142 and PR69845. */
6047 if (TREE_OVERFLOW (tem
))
6053 CASE_CONVERT
: case NON_LVALUE_EXPR
:
6054 /* If op0 is an expression ... */
6055 if ((COMPARISON_CLASS_P (op0
)
6056 || UNARY_CLASS_P (op0
)
6057 || BINARY_CLASS_P (op0
)
6058 || VL_EXP_CLASS_P (op0
)
6059 || EXPRESSION_CLASS_P (op0
))
6060 /* ... and has wrapping overflow, and its type is smaller
6061 than ctype, then we cannot pass through as widening. */
6062 && (((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
6063 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (op0
)))
6064 && (TYPE_PRECISION (ctype
)
6065 > TYPE_PRECISION (TREE_TYPE (op0
))))
6066 /* ... or this is a truncation (t is narrower than op0),
6067 then we cannot pass through this narrowing. */
6068 || (TYPE_PRECISION (type
)
6069 < TYPE_PRECISION (TREE_TYPE (op0
)))
6070 /* ... or signedness changes for division or modulus,
6071 then we cannot pass through this conversion. */
6072 || (code
!= MULT_EXPR
6073 && (TYPE_UNSIGNED (ctype
)
6074 != TYPE_UNSIGNED (TREE_TYPE (op0
))))
6075 /* ... or has undefined overflow while the converted to
6076 type has not, we cannot do the operation in the inner type
6077 as that would introduce undefined overflow. */
6078 || ((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
6079 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (op0
)))
6080 && !TYPE_OVERFLOW_UNDEFINED (type
))))
6083 /* Pass the constant down and see if we can make a simplification. If
6084 we can, replace this expression with the inner simplification for
6085 possible later conversion to our or some other type. */
6086 if ((t2
= fold_convert (TREE_TYPE (op0
), c
)) != 0
6087 && TREE_CODE (t2
) == INTEGER_CST
6088 && !TREE_OVERFLOW (t2
)
6089 && (0 != (t1
= extract_muldiv (op0
, t2
, code
,
6091 ? ctype
: NULL_TREE
,
6092 strict_overflow_p
))))
6097 /* If widening the type changes it from signed to unsigned, then we
6098 must avoid building ABS_EXPR itself as unsigned. */
6099 if (TYPE_UNSIGNED (ctype
) && !TYPE_UNSIGNED (type
))
6101 tree cstype
= (*signed_type_for
) (ctype
);
6102 if ((t1
= extract_muldiv (op0
, c
, code
, cstype
, strict_overflow_p
))
6105 t1
= fold_build1 (tcode
, cstype
, fold_convert (cstype
, t1
));
6106 return fold_convert (ctype
, t1
);
6110 /* If the constant is negative, we cannot simplify this. */
6111 if (tree_int_cst_sgn (c
) == -1)
6115 /* For division and modulus, type can't be unsigned, as e.g.
6116 (-(x / 2U)) / 2U isn't equal to -((x / 2U) / 2U) for x >= 2.
6117 For signed types, even with wrapping overflow, this is fine. */
6118 if (code
!= MULT_EXPR
&& TYPE_UNSIGNED (type
))
6120 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
, strict_overflow_p
))
6122 return fold_build1 (tcode
, ctype
, fold_convert (ctype
, t1
));
6125 case MIN_EXPR
: case MAX_EXPR
:
6126 /* If widening the type changes the signedness, then we can't perform
6127 this optimization as that changes the result. */
6128 if (TYPE_UNSIGNED (ctype
) != TYPE_UNSIGNED (type
))
6131 /* MIN (a, b) / 5 -> MIN (a / 5, b / 5) */
6132 sub_strict_overflow_p
= false;
6133 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6134 &sub_strict_overflow_p
)) != 0
6135 && (t2
= extract_muldiv (op1
, c
, code
, wide_type
,
6136 &sub_strict_overflow_p
)) != 0)
6138 if (tree_int_cst_sgn (c
) < 0)
6139 tcode
= (tcode
== MIN_EXPR
? MAX_EXPR
: MIN_EXPR
);
6140 if (sub_strict_overflow_p
)
6141 *strict_overflow_p
= true;
6142 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6143 fold_convert (ctype
, t2
));
6147 case LSHIFT_EXPR
: case RSHIFT_EXPR
:
6148 /* If the second operand is constant, this is a multiplication
6149 or floor division, by a power of two, so we can treat it that
6150 way unless the multiplier or divisor overflows. Signed
6151 left-shift overflow is implementation-defined rather than
6152 undefined in C90, so do not convert signed left shift into
6154 if (TREE_CODE (op1
) == INTEGER_CST
6155 && (tcode
== RSHIFT_EXPR
|| TYPE_UNSIGNED (TREE_TYPE (op0
)))
6156 /* const_binop may not detect overflow correctly,
6157 so check for it explicitly here. */
6158 && wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)), op1
)
6159 && 0 != (t1
= fold_convert (ctype
,
6160 const_binop (LSHIFT_EXPR
,
6163 && !TREE_OVERFLOW (t1
))
6164 return extract_muldiv (build2 (tcode
== LSHIFT_EXPR
6165 ? MULT_EXPR
: FLOOR_DIV_EXPR
,
6167 fold_convert (ctype
, op0
),
6169 c
, code
, wide_type
, strict_overflow_p
);
6172 case PLUS_EXPR
: case MINUS_EXPR
:
6173 /* See if we can eliminate the operation on both sides. If we can, we
6174 can return a new PLUS or MINUS. If we can't, the only remaining
6175 cases where we can do anything are if the second operand is a
6177 sub_strict_overflow_p
= false;
6178 t1
= extract_muldiv (op0
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6179 t2
= extract_muldiv (op1
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6180 if (t1
!= 0 && t2
!= 0
6181 && (code
== MULT_EXPR
6182 /* If not multiplication, we can only do this if both operands
6183 are divisible by c. */
6184 || (multiple_of_p (ctype
, op0
, c
)
6185 && multiple_of_p (ctype
, op1
, c
))))
6187 if (sub_strict_overflow_p
)
6188 *strict_overflow_p
= true;
6189 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6190 fold_convert (ctype
, t2
));
6193 /* If this was a subtraction, negate OP1 and set it to be an addition.
6194 This simplifies the logic below. */
6195 if (tcode
== MINUS_EXPR
)
6197 tcode
= PLUS_EXPR
, op1
= negate_expr (op1
);
6198 /* If OP1 was not easily negatable, the constant may be OP0. */
6199 if (TREE_CODE (op0
) == INTEGER_CST
)
6201 std::swap (op0
, op1
);
6206 if (TREE_CODE (op1
) != INTEGER_CST
)
6209 /* If either OP1 or C are negative, this optimization is not safe for
6210 some of the division and remainder types while for others we need
6211 to change the code. */
6212 if (tree_int_cst_sgn (op1
) < 0 || tree_int_cst_sgn (c
) < 0)
6214 if (code
== CEIL_DIV_EXPR
)
6215 code
= FLOOR_DIV_EXPR
;
6216 else if (code
== FLOOR_DIV_EXPR
)
6217 code
= CEIL_DIV_EXPR
;
6218 else if (code
!= MULT_EXPR
6219 && code
!= CEIL_MOD_EXPR
&& code
!= FLOOR_MOD_EXPR
)
6223 /* If it's a multiply or a division/modulus operation of a multiple
6224 of our constant, do the operation and verify it doesn't overflow. */
6225 if (code
== MULT_EXPR
6226 || wi::multiple_of_p (op1
, c
, TYPE_SIGN (type
)))
6228 op1
= const_binop (code
, fold_convert (ctype
, op1
),
6229 fold_convert (ctype
, c
));
6230 /* We allow the constant to overflow with wrapping semantics. */
6232 || (TREE_OVERFLOW (op1
) && !TYPE_OVERFLOW_WRAPS (ctype
)))
6238 /* If we have an unsigned type, we cannot widen the operation since it
6239 will change the result if the original computation overflowed. */
6240 if (TYPE_UNSIGNED (ctype
) && ctype
!= type
)
6243 /* If we were able to eliminate our operation from the first side,
6244 apply our operation to the second side and reform the PLUS. */
6245 if (t1
!= 0 && (TREE_CODE (t1
) != code
|| code
== MULT_EXPR
))
6246 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
), op1
);
6248 /* The last case is if we are a multiply. In that case, we can
6249 apply the distributive law to commute the multiply and addition
6250 if the multiplication of the constants doesn't overflow
6251 and overflow is defined. With undefined overflow
6252 op0 * c might overflow, while (op0 + orig_op1) * c doesn't. */
6253 if (code
== MULT_EXPR
&& TYPE_OVERFLOW_WRAPS (ctype
))
6254 return fold_build2 (tcode
, ctype
,
6255 fold_build2 (code
, ctype
,
6256 fold_convert (ctype
, op0
),
6257 fold_convert (ctype
, c
)),
6263 /* We have a special case here if we are doing something like
6264 (C * 8) % 4 since we know that's zero. */
6265 if ((code
== TRUNC_MOD_EXPR
|| code
== CEIL_MOD_EXPR
6266 || code
== FLOOR_MOD_EXPR
|| code
== ROUND_MOD_EXPR
)
6267 /* If the multiplication can overflow we cannot optimize this. */
6268 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (t
))
6269 && TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
6270 && wi::multiple_of_p (op1
, c
, TYPE_SIGN (type
)))
6272 *strict_overflow_p
= true;
6273 return omit_one_operand (type
, integer_zero_node
, op0
);
6276 /* ... fall through ... */
6278 case TRUNC_DIV_EXPR
: case CEIL_DIV_EXPR
: case FLOOR_DIV_EXPR
:
6279 case ROUND_DIV_EXPR
: case EXACT_DIV_EXPR
:
6280 /* If we can extract our operation from the LHS, do so and return a
6281 new operation. Likewise for the RHS from a MULT_EXPR. Otherwise,
6282 do something only if the second operand is a constant. */
6284 && TYPE_OVERFLOW_WRAPS (ctype
)
6285 && (t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6286 strict_overflow_p
)) != 0)
6287 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6288 fold_convert (ctype
, op1
));
6289 else if (tcode
== MULT_EXPR
&& code
== MULT_EXPR
6290 && TYPE_OVERFLOW_WRAPS (ctype
)
6291 && (t1
= extract_muldiv (op1
, c
, code
, wide_type
,
6292 strict_overflow_p
)) != 0)
6293 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6294 fold_convert (ctype
, t1
));
6295 else if (TREE_CODE (op1
) != INTEGER_CST
)
6298 /* If these are the same operation types, we can associate them
6299 assuming no overflow. */
6302 bool overflow_p
= false;
6303 bool overflow_mul_p
;
6304 signop sign
= TYPE_SIGN (ctype
);
6305 unsigned prec
= TYPE_PRECISION (ctype
);
6306 wide_int mul
= wi::mul (wi::to_wide (op1
, prec
),
6307 wi::to_wide (c
, prec
),
6308 sign
, &overflow_mul_p
);
6309 overflow_p
= TREE_OVERFLOW (c
) | TREE_OVERFLOW (op1
);
6311 && ((sign
== UNSIGNED
&& tcode
!= MULT_EXPR
) || sign
== SIGNED
))
6314 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6315 wide_int_to_tree (ctype
, mul
));
6318 /* If these operations "cancel" each other, we have the main
6319 optimizations of this pass, which occur when either constant is a
6320 multiple of the other, in which case we replace this with either an
6321 operation or CODE or TCODE.
6323 If we have an unsigned type, we cannot do this since it will change
6324 the result if the original computation overflowed. */
6325 if (TYPE_OVERFLOW_UNDEFINED (ctype
)
6326 && ((code
== MULT_EXPR
&& tcode
== EXACT_DIV_EXPR
)
6327 || (tcode
== MULT_EXPR
6328 && code
!= TRUNC_MOD_EXPR
&& code
!= CEIL_MOD_EXPR
6329 && code
!= FLOOR_MOD_EXPR
&& code
!= ROUND_MOD_EXPR
6330 && code
!= MULT_EXPR
)))
6332 if (wi::multiple_of_p (op1
, c
, TYPE_SIGN (type
)))
6334 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6335 *strict_overflow_p
= true;
6336 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6337 fold_convert (ctype
,
6338 const_binop (TRUNC_DIV_EXPR
,
6341 else if (wi::multiple_of_p (c
, op1
, TYPE_SIGN (type
)))
6343 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6344 *strict_overflow_p
= true;
6345 return fold_build2 (code
, ctype
, fold_convert (ctype
, op0
),
6346 fold_convert (ctype
,
6347 const_binop (TRUNC_DIV_EXPR
,
6360 /* Return a node which has the indicated constant VALUE (either 0 or
6361 1 for scalars or {-1,-1,..} or {0,0,...} for vectors),
6362 and is of the indicated TYPE. */
6365 constant_boolean_node (bool value
, tree type
)
6367 if (type
== integer_type_node
)
6368 return value
? integer_one_node
: integer_zero_node
;
6369 else if (type
== boolean_type_node
)
6370 return value
? boolean_true_node
: boolean_false_node
;
6371 else if (TREE_CODE (type
) == VECTOR_TYPE
)
6372 return build_vector_from_val (type
,
6373 build_int_cst (TREE_TYPE (type
),
6376 return fold_convert (type
, value
? integer_one_node
: integer_zero_node
);
6380 /* Transform `a + (b ? x : y)' into `b ? (a + x) : (a + y)'.
6381 Transform, `a + (x < y)' into `(x < y) ? (a + 1) : (a + 0)'. Here
6382 CODE corresponds to the `+', COND to the `(b ? x : y)' or `(x < y)'
6383 expression, and ARG to `a'. If COND_FIRST_P is nonzero, then the
6384 COND is the first argument to CODE; otherwise (as in the example
6385 given here), it is the second argument. TYPE is the type of the
6386 original expression. Return NULL_TREE if no simplification is
6390 fold_binary_op_with_conditional_arg (location_t loc
,
6391 enum tree_code code
,
6392 tree type
, tree op0
, tree op1
,
6393 tree cond
, tree arg
, int cond_first_p
)
6395 tree cond_type
= cond_first_p
? TREE_TYPE (op0
) : TREE_TYPE (op1
);
6396 tree arg_type
= cond_first_p
? TREE_TYPE (op1
) : TREE_TYPE (op0
);
6397 tree test
, true_value
, false_value
;
6398 tree lhs
= NULL_TREE
;
6399 tree rhs
= NULL_TREE
;
6400 enum tree_code cond_code
= COND_EXPR
;
6402 if (TREE_CODE (cond
) == COND_EXPR
6403 || TREE_CODE (cond
) == VEC_COND_EXPR
)
6405 test
= TREE_OPERAND (cond
, 0);
6406 true_value
= TREE_OPERAND (cond
, 1);
6407 false_value
= TREE_OPERAND (cond
, 2);
6408 /* If this operand throws an expression, then it does not make
6409 sense to try to perform a logical or arithmetic operation
6411 if (VOID_TYPE_P (TREE_TYPE (true_value
)))
6413 if (VOID_TYPE_P (TREE_TYPE (false_value
)))
6416 else if (!(TREE_CODE (type
) != VECTOR_TYPE
6417 && TREE_CODE (TREE_TYPE (cond
)) == VECTOR_TYPE
))
6419 tree testtype
= TREE_TYPE (cond
);
6421 true_value
= constant_boolean_node (true, testtype
);
6422 false_value
= constant_boolean_node (false, testtype
);
6425 /* Detect the case of mixing vector and scalar types - bail out. */
6428 if (TREE_CODE (TREE_TYPE (test
)) == VECTOR_TYPE
)
6429 cond_code
= VEC_COND_EXPR
;
6431 /* This transformation is only worthwhile if we don't have to wrap ARG
6432 in a SAVE_EXPR and the operation can be simplified without recursing
6433 on at least one of the branches once its pushed inside the COND_EXPR. */
6434 if (!TREE_CONSTANT (arg
)
6435 && (TREE_SIDE_EFFECTS (arg
)
6436 || TREE_CODE (arg
) == COND_EXPR
|| TREE_CODE (arg
) == VEC_COND_EXPR
6437 || TREE_CONSTANT (true_value
) || TREE_CONSTANT (false_value
)))
6440 arg
= fold_convert_loc (loc
, arg_type
, arg
);
6443 true_value
= fold_convert_loc (loc
, cond_type
, true_value
);
6445 lhs
= fold_build2_loc (loc
, code
, type
, true_value
, arg
);
6447 lhs
= fold_build2_loc (loc
, code
, type
, arg
, true_value
);
6451 false_value
= fold_convert_loc (loc
, cond_type
, false_value
);
6453 rhs
= fold_build2_loc (loc
, code
, type
, false_value
, arg
);
6455 rhs
= fold_build2_loc (loc
, code
, type
, arg
, false_value
);
6458 /* Check that we have simplified at least one of the branches. */
6459 if (!TREE_CONSTANT (arg
) && !TREE_CONSTANT (lhs
) && !TREE_CONSTANT (rhs
))
6462 return fold_build3_loc (loc
, cond_code
, type
, test
, lhs
, rhs
);
6466 /* Subroutine of fold() that checks for the addition of +/- 0.0.
6468 If !NEGATE, return true if ADDEND is +/-0.0 and, for all X of type
6469 TYPE, X + ADDEND is the same as X. If NEGATE, return true if X -
6470 ADDEND is the same as X.
6472 X + 0 and X - 0 both give X when X is NaN, infinite, or nonzero
6473 and finite. The problematic cases are when X is zero, and its mode
6474 has signed zeros. In the case of rounding towards -infinity,
6475 X - 0 is not the same as X because 0 - 0 is -0. In other rounding
6476 modes, X + 0 is not the same as X because -0 + 0 is 0. */
6479 fold_real_zero_addition_p (const_tree type
, const_tree addend
, int negate
)
6481 if (!real_zerop (addend
))
6484 /* Don't allow the fold with -fsignaling-nans. */
6485 if (HONOR_SNANS (element_mode (type
)))
6488 /* Allow the fold if zeros aren't signed, or their sign isn't important. */
6489 if (!HONOR_SIGNED_ZEROS (element_mode (type
)))
6492 /* In a vector or complex, we would need to check the sign of all zeros. */
6493 if (TREE_CODE (addend
) != REAL_CST
)
6496 /* Treat x + -0 as x - 0 and x - -0 as x + 0. */
6497 if (REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (addend
)))
6500 /* The mode has signed zeros, and we have to honor their sign.
6501 In this situation, there is only one case we can return true for.
6502 X - 0 is the same as X unless rounding towards -infinity is
6504 return negate
&& !HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
));
6507 /* Subroutine of fold() that optimizes comparisons of a division by
6508 a nonzero integer constant against an integer constant, i.e.
6511 CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR,
6512 GE_EXPR or LE_EXPR. TYPE is the type of the result and ARG0 and ARG1
6513 are the operands of the comparison. ARG1 must be a TREE_REAL_CST.
6515 The function returns the constant folded tree if a simplification
6516 can be made, and NULL_TREE otherwise. */
6519 fold_div_compare (location_t loc
,
6520 enum tree_code code
, tree type
, tree arg0
, tree arg1
)
6522 tree prod
, tmp
, hi
, lo
;
6523 tree arg00
= TREE_OPERAND (arg0
, 0);
6524 tree arg01
= TREE_OPERAND (arg0
, 1);
6525 signop sign
= TYPE_SIGN (TREE_TYPE (arg0
));
6526 bool neg_overflow
= false;
6529 /* We have to do this the hard way to detect unsigned overflow.
6530 prod = int_const_binop (MULT_EXPR, arg01, arg1); */
6531 wide_int val
= wi::mul (arg01
, arg1
, sign
, &overflow
);
6532 prod
= force_fit_type (TREE_TYPE (arg00
), val
, -1, overflow
);
6533 neg_overflow
= false;
6535 if (sign
== UNSIGNED
)
6537 tmp
= int_const_binop (MINUS_EXPR
, arg01
,
6538 build_int_cst (TREE_TYPE (arg01
), 1));
6541 /* Likewise hi = int_const_binop (PLUS_EXPR, prod, tmp). */
6542 val
= wi::add (prod
, tmp
, sign
, &overflow
);
6543 hi
= force_fit_type (TREE_TYPE (arg00
), val
,
6544 -1, overflow
| TREE_OVERFLOW (prod
));
6546 else if (tree_int_cst_sgn (arg01
) >= 0)
6548 tmp
= int_const_binop (MINUS_EXPR
, arg01
,
6549 build_int_cst (TREE_TYPE (arg01
), 1));
6550 switch (tree_int_cst_sgn (arg1
))
6553 neg_overflow
= true;
6554 lo
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
6559 lo
= fold_negate_const (tmp
, TREE_TYPE (arg0
));
6564 hi
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
6574 /* A negative divisor reverses the relational operators. */
6575 code
= swap_tree_comparison (code
);
6577 tmp
= int_const_binop (PLUS_EXPR
, arg01
,
6578 build_int_cst (TREE_TYPE (arg01
), 1));
6579 switch (tree_int_cst_sgn (arg1
))
6582 hi
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
6587 hi
= fold_negate_const (tmp
, TREE_TYPE (arg0
));
6592 neg_overflow
= true;
6593 lo
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
6605 if (TREE_OVERFLOW (lo
) && TREE_OVERFLOW (hi
))
6606 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg00
);
6607 if (TREE_OVERFLOW (hi
))
6608 return fold_build2_loc (loc
, GE_EXPR
, type
, arg00
, lo
);
6609 if (TREE_OVERFLOW (lo
))
6610 return fold_build2_loc (loc
, LE_EXPR
, type
, arg00
, hi
);
6611 return build_range_check (loc
, type
, arg00
, 1, lo
, hi
);
6614 if (TREE_OVERFLOW (lo
) && TREE_OVERFLOW (hi
))
6615 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg00
);
6616 if (TREE_OVERFLOW (hi
))
6617 return fold_build2_loc (loc
, LT_EXPR
, type
, arg00
, lo
);
6618 if (TREE_OVERFLOW (lo
))
6619 return fold_build2_loc (loc
, GT_EXPR
, type
, arg00
, hi
);
6620 return build_range_check (loc
, type
, arg00
, 0, lo
, hi
);
6623 if (TREE_OVERFLOW (lo
))
6625 tmp
= neg_overflow
? integer_zero_node
: integer_one_node
;
6626 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6628 return fold_build2_loc (loc
, LT_EXPR
, type
, arg00
, lo
);
6631 if (TREE_OVERFLOW (hi
))
6633 tmp
= neg_overflow
? integer_zero_node
: integer_one_node
;
6634 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6636 return fold_build2_loc (loc
, LE_EXPR
, type
, arg00
, hi
);
6639 if (TREE_OVERFLOW (hi
))
6641 tmp
= neg_overflow
? integer_one_node
: integer_zero_node
;
6642 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6644 return fold_build2_loc (loc
, GT_EXPR
, type
, arg00
, hi
);
6647 if (TREE_OVERFLOW (lo
))
6649 tmp
= neg_overflow
? integer_one_node
: integer_zero_node
;
6650 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6652 return fold_build2_loc (loc
, GE_EXPR
, type
, arg00
, lo
);
6662 /* If CODE with arguments ARG0 and ARG1 represents a single bit
6663 equality/inequality test, then return a simplified form of the test
6664 using a sign testing. Otherwise return NULL. TYPE is the desired
6668 fold_single_bit_test_into_sign_test (location_t loc
,
6669 enum tree_code code
, tree arg0
, tree arg1
,
6672 /* If this is testing a single bit, we can optimize the test. */
6673 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
6674 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
6675 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
6677 /* If we have (A & C) != 0 where C is the sign bit of A, convert
6678 this into A < 0. Similarly for (A & C) == 0 into A >= 0. */
6679 tree arg00
= sign_bit_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg0
, 1));
6681 if (arg00
!= NULL_TREE
6682 /* This is only a win if casting to a signed type is cheap,
6683 i.e. when arg00's type is not a partial mode. */
6684 && TYPE_PRECISION (TREE_TYPE (arg00
))
6685 == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (arg00
))))
6687 tree stype
= signed_type_for (TREE_TYPE (arg00
));
6688 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
6690 fold_convert_loc (loc
, stype
, arg00
),
6691 build_int_cst (stype
, 0));
6698 /* If CODE with arguments ARG0 and ARG1 represents a single bit
6699 equality/inequality test, then return a simplified form of
6700 the test using shifts and logical operations. Otherwise return
6701 NULL. TYPE is the desired result type. */
6704 fold_single_bit_test (location_t loc
, enum tree_code code
,
6705 tree arg0
, tree arg1
, tree result_type
)
6707 /* If this is testing a single bit, we can optimize the test. */
6708 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
6709 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
6710 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
6712 tree inner
= TREE_OPERAND (arg0
, 0);
6713 tree type
= TREE_TYPE (arg0
);
6714 int bitnum
= tree_log2 (TREE_OPERAND (arg0
, 1));
6715 machine_mode operand_mode
= TYPE_MODE (type
);
6717 tree signed_type
, unsigned_type
, intermediate_type
;
6720 /* First, see if we can fold the single bit test into a sign-bit
6722 tem
= fold_single_bit_test_into_sign_test (loc
, code
, arg0
, arg1
,
6727 /* Otherwise we have (A & C) != 0 where C is a single bit,
6728 convert that into ((A >> C2) & 1). Where C2 = log2(C).
6729 Similarly for (A & C) == 0. */
6731 /* If INNER is a right shift of a constant and it plus BITNUM does
6732 not overflow, adjust BITNUM and INNER. */
6733 if (TREE_CODE (inner
) == RSHIFT_EXPR
6734 && TREE_CODE (TREE_OPERAND (inner
, 1)) == INTEGER_CST
6735 && bitnum
< TYPE_PRECISION (type
)
6736 && wi::ltu_p (TREE_OPERAND (inner
, 1),
6737 TYPE_PRECISION (type
) - bitnum
))
6739 bitnum
+= tree_to_uhwi (TREE_OPERAND (inner
, 1));
6740 inner
= TREE_OPERAND (inner
, 0);
6743 /* If we are going to be able to omit the AND below, we must do our
6744 operations as unsigned. If we must use the AND, we have a choice.
6745 Normally unsigned is faster, but for some machines signed is. */
6746 ops_unsigned
= (load_extend_op (operand_mode
) == SIGN_EXTEND
6747 && !flag_syntax_only
) ? 0 : 1;
6749 signed_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 0);
6750 unsigned_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 1);
6751 intermediate_type
= ops_unsigned
? unsigned_type
: signed_type
;
6752 inner
= fold_convert_loc (loc
, intermediate_type
, inner
);
6755 inner
= build2 (RSHIFT_EXPR
, intermediate_type
,
6756 inner
, size_int (bitnum
));
6758 one
= build_int_cst (intermediate_type
, 1);
6760 if (code
== EQ_EXPR
)
6761 inner
= fold_build2_loc (loc
, BIT_XOR_EXPR
, intermediate_type
, inner
, one
);
6763 /* Put the AND last so it can combine with more things. */
6764 inner
= build2 (BIT_AND_EXPR
, intermediate_type
, inner
, one
);
6766 /* Make sure to return the proper type. */
6767 inner
= fold_convert_loc (loc
, result_type
, inner
);
6774 /* Test whether it is preferable two swap two operands, ARG0 and
6775 ARG1, for example because ARG0 is an integer constant and ARG1
6779 tree_swap_operands_p (const_tree arg0
, const_tree arg1
)
6781 if (CONSTANT_CLASS_P (arg1
))
6783 if (CONSTANT_CLASS_P (arg0
))
6789 if (TREE_CONSTANT (arg1
))
6791 if (TREE_CONSTANT (arg0
))
6794 /* It is preferable to swap two SSA_NAME to ensure a canonical form
6795 for commutative and comparison operators. Ensuring a canonical
6796 form allows the optimizers to find additional redundancies without
6797 having to explicitly check for both orderings. */
6798 if (TREE_CODE (arg0
) == SSA_NAME
6799 && TREE_CODE (arg1
) == SSA_NAME
6800 && SSA_NAME_VERSION (arg0
) > SSA_NAME_VERSION (arg1
))
6803 /* Put SSA_NAMEs last. */
6804 if (TREE_CODE (arg1
) == SSA_NAME
)
6806 if (TREE_CODE (arg0
) == SSA_NAME
)
6809 /* Put variables last. */
6819 /* Fold A < X && A + 1 > Y to A < X && A >= Y. Normally A + 1 > Y
6820 means A >= Y && A != MAX, but in this case we know that
6821 A < X <= MAX. INEQ is A + 1 > Y, BOUND is A < X. */
6824 fold_to_nonsharp_ineq_using_bound (location_t loc
, tree ineq
, tree bound
)
6826 tree a
, typea
, type
= TREE_TYPE (ineq
), a1
, diff
, y
;
6828 if (TREE_CODE (bound
) == LT_EXPR
)
6829 a
= TREE_OPERAND (bound
, 0);
6830 else if (TREE_CODE (bound
) == GT_EXPR
)
6831 a
= TREE_OPERAND (bound
, 1);
6835 typea
= TREE_TYPE (a
);
6836 if (!INTEGRAL_TYPE_P (typea
)
6837 && !POINTER_TYPE_P (typea
))
6840 if (TREE_CODE (ineq
) == LT_EXPR
)
6842 a1
= TREE_OPERAND (ineq
, 1);
6843 y
= TREE_OPERAND (ineq
, 0);
6845 else if (TREE_CODE (ineq
) == GT_EXPR
)
6847 a1
= TREE_OPERAND (ineq
, 0);
6848 y
= TREE_OPERAND (ineq
, 1);
6853 if (TREE_TYPE (a1
) != typea
)
6856 if (POINTER_TYPE_P (typea
))
6858 /* Convert the pointer types into integer before taking the difference. */
6859 tree ta
= fold_convert_loc (loc
, ssizetype
, a
);
6860 tree ta1
= fold_convert_loc (loc
, ssizetype
, a1
);
6861 diff
= fold_binary_loc (loc
, MINUS_EXPR
, ssizetype
, ta1
, ta
);
6864 diff
= fold_binary_loc (loc
, MINUS_EXPR
, typea
, a1
, a
);
6866 if (!diff
|| !integer_onep (diff
))
6869 return fold_build2_loc (loc
, GE_EXPR
, type
, a
, y
);
6872 /* Fold a sum or difference of at least one multiplication.
6873 Returns the folded tree or NULL if no simplification could be made. */
6876 fold_plusminus_mult_expr (location_t loc
, enum tree_code code
, tree type
,
6877 tree arg0
, tree arg1
)
6879 tree arg00
, arg01
, arg10
, arg11
;
6880 tree alt0
= NULL_TREE
, alt1
= NULL_TREE
, same
;
6882 /* (A * C) +- (B * C) -> (A+-B) * C.
6883 (A * C) +- A -> A * (C+-1).
6884 We are most concerned about the case where C is a constant,
6885 but other combinations show up during loop reduction. Since
6886 it is not difficult, try all four possibilities. */
6888 if (TREE_CODE (arg0
) == MULT_EXPR
)
6890 arg00
= TREE_OPERAND (arg0
, 0);
6891 arg01
= TREE_OPERAND (arg0
, 1);
6893 else if (TREE_CODE (arg0
) == INTEGER_CST
)
6895 arg00
= build_one_cst (type
);
6900 /* We cannot generate constant 1 for fract. */
6901 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
6904 arg01
= build_one_cst (type
);
6906 if (TREE_CODE (arg1
) == MULT_EXPR
)
6908 arg10
= TREE_OPERAND (arg1
, 0);
6909 arg11
= TREE_OPERAND (arg1
, 1);
6911 else if (TREE_CODE (arg1
) == INTEGER_CST
)
6913 arg10
= build_one_cst (type
);
6914 /* As we canonicalize A - 2 to A + -2 get rid of that sign for
6915 the purpose of this canonicalization. */
6916 if (wi::neg_p (arg1
, TYPE_SIGN (TREE_TYPE (arg1
)))
6917 && negate_expr_p (arg1
)
6918 && code
== PLUS_EXPR
)
6920 arg11
= negate_expr (arg1
);
6928 /* We cannot generate constant 1 for fract. */
6929 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
6932 arg11
= build_one_cst (type
);
6936 if (operand_equal_p (arg01
, arg11
, 0))
6937 same
= arg01
, alt0
= arg00
, alt1
= arg10
;
6938 else if (operand_equal_p (arg00
, arg10
, 0))
6939 same
= arg00
, alt0
= arg01
, alt1
= arg11
;
6940 else if (operand_equal_p (arg00
, arg11
, 0))
6941 same
= arg00
, alt0
= arg01
, alt1
= arg10
;
6942 else if (operand_equal_p (arg01
, arg10
, 0))
6943 same
= arg01
, alt0
= arg00
, alt1
= arg11
;
6945 /* No identical multiplicands; see if we can find a common
6946 power-of-two factor in non-power-of-two multiplies. This
6947 can help in multi-dimensional array access. */
6948 else if (tree_fits_shwi_p (arg01
)
6949 && tree_fits_shwi_p (arg11
))
6951 HOST_WIDE_INT int01
, int11
, tmp
;
6954 int01
= tree_to_shwi (arg01
);
6955 int11
= tree_to_shwi (arg11
);
6957 /* Move min of absolute values to int11. */
6958 if (absu_hwi (int01
) < absu_hwi (int11
))
6960 tmp
= int01
, int01
= int11
, int11
= tmp
;
6961 alt0
= arg00
, arg00
= arg10
, arg10
= alt0
;
6968 if (exact_log2 (absu_hwi (int11
)) > 0 && int01
% int11
== 0
6969 /* The remainder should not be a constant, otherwise we
6970 end up folding i * 4 + 2 to (i * 2 + 1) * 2 which has
6971 increased the number of multiplications necessary. */
6972 && TREE_CODE (arg10
) != INTEGER_CST
)
6974 alt0
= fold_build2_loc (loc
, MULT_EXPR
, TREE_TYPE (arg00
), arg00
,
6975 build_int_cst (TREE_TYPE (arg00
),
6980 maybe_same
= alt0
, alt0
= alt1
, alt1
= maybe_same
;
6985 return fold_build2_loc (loc
, MULT_EXPR
, type
,
6986 fold_build2_loc (loc
, code
, type
,
6987 fold_convert_loc (loc
, type
, alt0
),
6988 fold_convert_loc (loc
, type
, alt1
)),
6989 fold_convert_loc (loc
, type
, same
));
6994 /* Subroutine of native_encode_expr. Encode the INTEGER_CST
6995 specified by EXPR into the buffer PTR of length LEN bytes.
6996 Return the number of bytes placed in the buffer, or zero
7000 native_encode_int (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7002 tree type
= TREE_TYPE (expr
);
7003 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7004 int byte
, offset
, word
, words
;
7005 unsigned char value
;
7007 if ((off
== -1 && total_bytes
> len
)
7008 || off
>= total_bytes
)
7012 words
= total_bytes
/ UNITS_PER_WORD
;
7014 for (byte
= 0; byte
< total_bytes
; byte
++)
7016 int bitpos
= byte
* BITS_PER_UNIT
;
7017 /* Extend EXPR according to TYPE_SIGN if the precision isn't a whole
7019 value
= wi::extract_uhwi (wi::to_widest (expr
), bitpos
, BITS_PER_UNIT
);
7021 if (total_bytes
> UNITS_PER_WORD
)
7023 word
= byte
/ UNITS_PER_WORD
;
7024 if (WORDS_BIG_ENDIAN
)
7025 word
= (words
- 1) - word
;
7026 offset
= word
* UNITS_PER_WORD
;
7027 if (BYTES_BIG_ENDIAN
)
7028 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7030 offset
+= byte
% UNITS_PER_WORD
;
7033 offset
= BYTES_BIG_ENDIAN
? (total_bytes
- 1) - byte
: byte
;
7035 && offset
- off
< len
)
7036 ptr
[offset
- off
] = value
;
7038 return MIN (len
, total_bytes
- off
);
7042 /* Subroutine of native_encode_expr. Encode the FIXED_CST
7043 specified by EXPR into the buffer PTR of length LEN bytes.
7044 Return the number of bytes placed in the buffer, or zero
7048 native_encode_fixed (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7050 tree type
= TREE_TYPE (expr
);
7051 machine_mode mode
= TYPE_MODE (type
);
7052 int total_bytes
= GET_MODE_SIZE (mode
);
7053 FIXED_VALUE_TYPE value
;
7054 tree i_value
, i_type
;
7056 if (total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7059 i_type
= lang_hooks
.types
.type_for_size (GET_MODE_BITSIZE (mode
), 1);
7061 if (NULL_TREE
== i_type
7062 || TYPE_PRECISION (i_type
) != total_bytes
)
7065 value
= TREE_FIXED_CST (expr
);
7066 i_value
= double_int_to_tree (i_type
, value
.data
);
7068 return native_encode_int (i_value
, ptr
, len
, off
);
7072 /* Subroutine of native_encode_expr. Encode the REAL_CST
7073 specified by EXPR into the buffer PTR of length LEN bytes.
7074 Return the number of bytes placed in the buffer, or zero
7078 native_encode_real (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7080 tree type
= TREE_TYPE (expr
);
7081 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7082 int byte
, offset
, word
, words
, bitpos
;
7083 unsigned char value
;
7085 /* There are always 32 bits in each long, no matter the size of
7086 the hosts long. We handle floating point representations with
7090 if ((off
== -1 && total_bytes
> len
)
7091 || off
>= total_bytes
)
7095 words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
7097 real_to_target (tmp
, TREE_REAL_CST_PTR (expr
), TYPE_MODE (type
));
7099 for (bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
7100 bitpos
+= BITS_PER_UNIT
)
7102 byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
7103 value
= (unsigned char) (tmp
[bitpos
/ 32] >> (bitpos
& 31));
7105 if (UNITS_PER_WORD
< 4)
7107 word
= byte
/ UNITS_PER_WORD
;
7108 if (WORDS_BIG_ENDIAN
)
7109 word
= (words
- 1) - word
;
7110 offset
= word
* UNITS_PER_WORD
;
7111 if (BYTES_BIG_ENDIAN
)
7112 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7114 offset
+= byte
% UNITS_PER_WORD
;
7119 if (BYTES_BIG_ENDIAN
)
7121 /* Reverse bytes within each long, or within the entire float
7122 if it's smaller than a long (for HFmode). */
7123 offset
= MIN (3, total_bytes
- 1) - offset
;
7124 gcc_assert (offset
>= 0);
7127 offset
= offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3);
7129 && offset
- off
< len
)
7130 ptr
[offset
- off
] = value
;
7132 return MIN (len
, total_bytes
- off
);
7135 /* Subroutine of native_encode_expr. Encode the COMPLEX_CST
7136 specified by EXPR into the buffer PTR of length LEN bytes.
7137 Return the number of bytes placed in the buffer, or zero
7141 native_encode_complex (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7146 part
= TREE_REALPART (expr
);
7147 rsize
= native_encode_expr (part
, ptr
, len
, off
);
7151 part
= TREE_IMAGPART (expr
);
7153 off
= MAX (0, off
- GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (part
))));
7154 isize
= native_encode_expr (part
, ptr
+rsize
, len
-rsize
, off
);
7158 return rsize
+ isize
;
7162 /* Subroutine of native_encode_expr. Encode the VECTOR_CST
7163 specified by EXPR into the buffer PTR of length LEN bytes.
7164 Return the number of bytes placed in the buffer, or zero
7168 native_encode_vector (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7175 count
= VECTOR_CST_NELTS (expr
);
7176 itype
= TREE_TYPE (TREE_TYPE (expr
));
7177 size
= GET_MODE_SIZE (TYPE_MODE (itype
));
7178 for (i
= 0; i
< count
; i
++)
7185 elem
= VECTOR_CST_ELT (expr
, i
);
7186 int res
= native_encode_expr (elem
, ptr
+offset
, len
-offset
, off
);
7187 if ((off
== -1 && res
!= size
)
7200 /* Subroutine of native_encode_expr. Encode the STRING_CST
7201 specified by EXPR into the buffer PTR of length LEN bytes.
7202 Return the number of bytes placed in the buffer, or zero
7206 native_encode_string (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7208 tree type
= TREE_TYPE (expr
);
7209 HOST_WIDE_INT total_bytes
;
7211 if (TREE_CODE (type
) != ARRAY_TYPE
7212 || TREE_CODE (TREE_TYPE (type
)) != INTEGER_TYPE
7213 || GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type
))) != BITS_PER_UNIT
7214 || !tree_fits_shwi_p (TYPE_SIZE_UNIT (type
)))
7216 total_bytes
= tree_to_shwi (TYPE_SIZE_UNIT (type
));
7217 if ((off
== -1 && total_bytes
> len
)
7218 || off
>= total_bytes
)
7222 if (TREE_STRING_LENGTH (expr
) - off
< MIN (total_bytes
, len
))
7225 if (off
< TREE_STRING_LENGTH (expr
))
7227 written
= MIN (len
, TREE_STRING_LENGTH (expr
) - off
);
7228 memcpy (ptr
, TREE_STRING_POINTER (expr
) + off
, written
);
7230 memset (ptr
+ written
, 0,
7231 MIN (total_bytes
- written
, len
- written
));
7234 memcpy (ptr
, TREE_STRING_POINTER (expr
) + off
, MIN (total_bytes
, len
));
7235 return MIN (total_bytes
- off
, len
);
7239 /* Subroutine of fold_view_convert_expr. Encode the INTEGER_CST,
7240 REAL_CST, COMPLEX_CST or VECTOR_CST specified by EXPR into the
7241 buffer PTR of length LEN bytes. If OFF is not -1 then start
7242 the encoding at byte offset OFF and encode at most LEN bytes.
7243 Return the number of bytes placed in the buffer, or zero upon failure. */
7246 native_encode_expr (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7248 /* We don't support starting at negative offset and -1 is special. */
7252 switch (TREE_CODE (expr
))
7255 return native_encode_int (expr
, ptr
, len
, off
);
7258 return native_encode_real (expr
, ptr
, len
, off
);
7261 return native_encode_fixed (expr
, ptr
, len
, off
);
7264 return native_encode_complex (expr
, ptr
, len
, off
);
7267 return native_encode_vector (expr
, ptr
, len
, off
);
7270 return native_encode_string (expr
, ptr
, len
, off
);
7278 /* Subroutine of native_interpret_expr. Interpret the contents of
7279 the buffer PTR of length LEN as an INTEGER_CST of type TYPE.
7280 If the buffer cannot be interpreted, return NULL_TREE. */
7283 native_interpret_int (tree type
, const unsigned char *ptr
, int len
)
7285 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7287 if (total_bytes
> len
7288 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7291 wide_int result
= wi::from_buffer (ptr
, total_bytes
);
7293 return wide_int_to_tree (type
, result
);
7297 /* Subroutine of native_interpret_expr. Interpret the contents of
7298 the buffer PTR of length LEN as a FIXED_CST of type TYPE.
7299 If the buffer cannot be interpreted, return NULL_TREE. */
7302 native_interpret_fixed (tree type
, const unsigned char *ptr
, int len
)
7304 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7306 FIXED_VALUE_TYPE fixed_value
;
7308 if (total_bytes
> len
7309 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7312 result
= double_int::from_buffer (ptr
, total_bytes
);
7313 fixed_value
= fixed_from_double_int (result
, TYPE_MODE (type
));
7315 return build_fixed (type
, fixed_value
);
7319 /* Subroutine of native_interpret_expr. Interpret the contents of
7320 the buffer PTR of length LEN as a REAL_CST of type TYPE.
7321 If the buffer cannot be interpreted, return NULL_TREE. */
7324 native_interpret_real (tree type
, const unsigned char *ptr
, int len
)
7326 machine_mode mode
= TYPE_MODE (type
);
7327 int total_bytes
= GET_MODE_SIZE (mode
);
7328 unsigned char value
;
7329 /* There are always 32 bits in each long, no matter the size of
7330 the hosts long. We handle floating point representations with
7335 total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7336 if (total_bytes
> len
|| total_bytes
> 24)
7338 int words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
7340 memset (tmp
, 0, sizeof (tmp
));
7341 for (int bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
7342 bitpos
+= BITS_PER_UNIT
)
7344 /* Both OFFSET and BYTE index within a long;
7345 bitpos indexes the whole float. */
7346 int offset
, byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
7347 if (UNITS_PER_WORD
< 4)
7349 int word
= byte
/ UNITS_PER_WORD
;
7350 if (WORDS_BIG_ENDIAN
)
7351 word
= (words
- 1) - word
;
7352 offset
= word
* UNITS_PER_WORD
;
7353 if (BYTES_BIG_ENDIAN
)
7354 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7356 offset
+= byte
% UNITS_PER_WORD
;
7361 if (BYTES_BIG_ENDIAN
)
7363 /* Reverse bytes within each long, or within the entire float
7364 if it's smaller than a long (for HFmode). */
7365 offset
= MIN (3, total_bytes
- 1) - offset
;
7366 gcc_assert (offset
>= 0);
7369 value
= ptr
[offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3)];
7371 tmp
[bitpos
/ 32] |= (unsigned long)value
<< (bitpos
& 31);
7374 real_from_target (&r
, tmp
, mode
);
7375 return build_real (type
, r
);
7379 /* Subroutine of native_interpret_expr. Interpret the contents of
7380 the buffer PTR of length LEN as a COMPLEX_CST of type TYPE.
7381 If the buffer cannot be interpreted, return NULL_TREE. */
7384 native_interpret_complex (tree type
, const unsigned char *ptr
, int len
)
7386 tree etype
, rpart
, ipart
;
7389 etype
= TREE_TYPE (type
);
7390 size
= GET_MODE_SIZE (TYPE_MODE (etype
));
7393 rpart
= native_interpret_expr (etype
, ptr
, size
);
7396 ipart
= native_interpret_expr (etype
, ptr
+size
, size
);
7399 return build_complex (type
, rpart
, ipart
);
7403 /* Subroutine of native_interpret_expr. Interpret the contents of
7404 the buffer PTR of length LEN as a VECTOR_CST of type TYPE.
7405 If the buffer cannot be interpreted, return NULL_TREE. */
7408 native_interpret_vector (tree type
, const unsigned char *ptr
, int len
)
7414 etype
= TREE_TYPE (type
);
7415 size
= GET_MODE_SIZE (TYPE_MODE (etype
));
7416 count
= TYPE_VECTOR_SUBPARTS (type
);
7417 if (size
* count
> len
)
7420 elements
= XALLOCAVEC (tree
, count
);
7421 for (i
= count
- 1; i
>= 0; i
--)
7423 elem
= native_interpret_expr (etype
, ptr
+(i
*size
), size
);
7428 return build_vector (type
, elements
);
7432 /* Subroutine of fold_view_convert_expr. Interpret the contents of
7433 the buffer PTR of length LEN as a constant of type TYPE. For
7434 INTEGRAL_TYPE_P we return an INTEGER_CST, for SCALAR_FLOAT_TYPE_P
7435 we return a REAL_CST, etc... If the buffer cannot be interpreted,
7436 return NULL_TREE. */
7439 native_interpret_expr (tree type
, const unsigned char *ptr
, int len
)
7441 switch (TREE_CODE (type
))
7447 case REFERENCE_TYPE
:
7448 return native_interpret_int (type
, ptr
, len
);
7451 return native_interpret_real (type
, ptr
, len
);
7453 case FIXED_POINT_TYPE
:
7454 return native_interpret_fixed (type
, ptr
, len
);
7457 return native_interpret_complex (type
, ptr
, len
);
7460 return native_interpret_vector (type
, ptr
, len
);
7467 /* Returns true if we can interpret the contents of a native encoding
7471 can_native_interpret_type_p (tree type
)
7473 switch (TREE_CODE (type
))
7479 case REFERENCE_TYPE
:
7480 case FIXED_POINT_TYPE
:
7490 /* Return true iff a constant of type TYPE is accepted by
7491 native_encode_expr. */
7494 can_native_encode_type_p (tree type
)
7496 switch (TREE_CODE (type
))
7500 case FIXED_POINT_TYPE
:
7510 /* Fold a VIEW_CONVERT_EXPR of a constant expression EXPR to type
7511 TYPE at compile-time. If we're unable to perform the conversion
7512 return NULL_TREE. */
7515 fold_view_convert_expr (tree type
, tree expr
)
7517 /* We support up to 512-bit values (for V8DFmode). */
7518 unsigned char buffer
[64];
7521 /* Check that the host and target are sane. */
7522 if (CHAR_BIT
!= 8 || BITS_PER_UNIT
!= 8)
7525 len
= native_encode_expr (expr
, buffer
, sizeof (buffer
));
7529 return native_interpret_expr (type
, buffer
, len
);
7532 /* Build an expression for the address of T. Folds away INDIRECT_REF
7533 to avoid confusing the gimplify process. */
7536 build_fold_addr_expr_with_type_loc (location_t loc
, tree t
, tree ptrtype
)
7538 /* The size of the object is not relevant when talking about its address. */
7539 if (TREE_CODE (t
) == WITH_SIZE_EXPR
)
7540 t
= TREE_OPERAND (t
, 0);
7542 if (TREE_CODE (t
) == INDIRECT_REF
)
7544 t
= TREE_OPERAND (t
, 0);
7546 if (TREE_TYPE (t
) != ptrtype
)
7547 t
= build1_loc (loc
, NOP_EXPR
, ptrtype
, t
);
7549 else if (TREE_CODE (t
) == MEM_REF
7550 && integer_zerop (TREE_OPERAND (t
, 1)))
7551 return TREE_OPERAND (t
, 0);
7552 else if (TREE_CODE (t
) == MEM_REF
7553 && TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
)
7554 return fold_binary (POINTER_PLUS_EXPR
, ptrtype
,
7555 TREE_OPERAND (t
, 0),
7556 convert_to_ptrofftype (TREE_OPERAND (t
, 1)));
7557 else if (TREE_CODE (t
) == VIEW_CONVERT_EXPR
)
7559 t
= build_fold_addr_expr_loc (loc
, TREE_OPERAND (t
, 0));
7561 if (TREE_TYPE (t
) != ptrtype
)
7562 t
= fold_convert_loc (loc
, ptrtype
, t
);
7565 t
= build1_loc (loc
, ADDR_EXPR
, ptrtype
, t
);
7570 /* Build an expression for the address of T. */
7573 build_fold_addr_expr_loc (location_t loc
, tree t
)
7575 tree ptrtype
= build_pointer_type (TREE_TYPE (t
));
7577 return build_fold_addr_expr_with_type_loc (loc
, t
, ptrtype
);
7580 /* Fold a unary expression of code CODE and type TYPE with operand
7581 OP0. Return the folded expression if folding is successful.
7582 Otherwise, return NULL_TREE. */
7585 fold_unary_loc (location_t loc
, enum tree_code code
, tree type
, tree op0
)
7589 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
7591 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
7592 && TREE_CODE_LENGTH (code
) == 1);
7597 if (CONVERT_EXPR_CODE_P (code
)
7598 || code
== FLOAT_EXPR
|| code
== ABS_EXPR
|| code
== NEGATE_EXPR
)
7600 /* Don't use STRIP_NOPS, because signedness of argument type
7602 STRIP_SIGN_NOPS (arg0
);
7606 /* Strip any conversions that don't change the mode. This
7607 is safe for every expression, except for a comparison
7608 expression because its signedness is derived from its
7611 Note that this is done as an internal manipulation within
7612 the constant folder, in order to find the simplest
7613 representation of the arguments so that their form can be
7614 studied. In any cases, the appropriate type conversions
7615 should be put back in the tree that will get out of the
7620 if (CONSTANT_CLASS_P (arg0
))
7622 tree tem
= const_unop (code
, type
, arg0
);
7625 if (TREE_TYPE (tem
) != type
)
7626 tem
= fold_convert_loc (loc
, type
, tem
);
7632 tem
= generic_simplify (loc
, code
, type
, op0
);
7636 if (TREE_CODE_CLASS (code
) == tcc_unary
)
7638 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
7639 return build2 (COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
7640 fold_build1_loc (loc
, code
, type
,
7641 fold_convert_loc (loc
, TREE_TYPE (op0
),
7642 TREE_OPERAND (arg0
, 1))));
7643 else if (TREE_CODE (arg0
) == COND_EXPR
)
7645 tree arg01
= TREE_OPERAND (arg0
, 1);
7646 tree arg02
= TREE_OPERAND (arg0
, 2);
7647 if (! VOID_TYPE_P (TREE_TYPE (arg01
)))
7648 arg01
= fold_build1_loc (loc
, code
, type
,
7649 fold_convert_loc (loc
,
7650 TREE_TYPE (op0
), arg01
));
7651 if (! VOID_TYPE_P (TREE_TYPE (arg02
)))
7652 arg02
= fold_build1_loc (loc
, code
, type
,
7653 fold_convert_loc (loc
,
7654 TREE_TYPE (op0
), arg02
));
7655 tem
= fold_build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
7658 /* If this was a conversion, and all we did was to move into
7659 inside the COND_EXPR, bring it back out. But leave it if
7660 it is a conversion from integer to integer and the
7661 result precision is no wider than a word since such a
7662 conversion is cheap and may be optimized away by combine,
7663 while it couldn't if it were outside the COND_EXPR. Then return
7664 so we don't get into an infinite recursion loop taking the
7665 conversion out and then back in. */
7667 if ((CONVERT_EXPR_CODE_P (code
)
7668 || code
== NON_LVALUE_EXPR
)
7669 && TREE_CODE (tem
) == COND_EXPR
7670 && TREE_CODE (TREE_OPERAND (tem
, 1)) == code
7671 && TREE_CODE (TREE_OPERAND (tem
, 2)) == code
7672 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 1))
7673 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 2))
7674 && (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))
7675 == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 2), 0)))
7676 && (! (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
7678 (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))))
7679 && TYPE_PRECISION (TREE_TYPE (tem
)) <= BITS_PER_WORD
)
7680 || flag_syntax_only
))
7681 tem
= build1_loc (loc
, code
, type
,
7683 TREE_TYPE (TREE_OPERAND
7684 (TREE_OPERAND (tem
, 1), 0)),
7685 TREE_OPERAND (tem
, 0),
7686 TREE_OPERAND (TREE_OPERAND (tem
, 1), 0),
7687 TREE_OPERAND (TREE_OPERAND (tem
, 2),
7695 case NON_LVALUE_EXPR
:
7696 if (!maybe_lvalue_p (op0
))
7697 return fold_convert_loc (loc
, type
, op0
);
7702 case FIX_TRUNC_EXPR
:
7703 if (COMPARISON_CLASS_P (op0
))
7705 /* If we have (type) (a CMP b) and type is an integral type, return
7706 new expression involving the new type. Canonicalize
7707 (type) (a CMP b) to (a CMP b) ? (type) true : (type) false for
7709 Do not fold the result as that would not simplify further, also
7710 folding again results in recursions. */
7711 if (TREE_CODE (type
) == BOOLEAN_TYPE
)
7712 return build2_loc (loc
, TREE_CODE (op0
), type
,
7713 TREE_OPERAND (op0
, 0),
7714 TREE_OPERAND (op0
, 1));
7715 else if (!INTEGRAL_TYPE_P (type
) && !VOID_TYPE_P (type
)
7716 && TREE_CODE (type
) != VECTOR_TYPE
)
7717 return build3_loc (loc
, COND_EXPR
, type
, op0
,
7718 constant_boolean_node (true, type
),
7719 constant_boolean_node (false, type
));
7722 /* Handle (T *)&A.B.C for A being of type T and B and C
7723 living at offset zero. This occurs frequently in
7724 C++ upcasting and then accessing the base. */
7725 if (TREE_CODE (op0
) == ADDR_EXPR
7726 && POINTER_TYPE_P (type
)
7727 && handled_component_p (TREE_OPERAND (op0
, 0)))
7729 HOST_WIDE_INT bitsize
, bitpos
;
7732 int unsignedp
, reversep
, volatilep
;
7734 = get_inner_reference (TREE_OPERAND (op0
, 0), &bitsize
, &bitpos
,
7735 &offset
, &mode
, &unsignedp
, &reversep
,
7737 /* If the reference was to a (constant) zero offset, we can use
7738 the address of the base if it has the same base type
7739 as the result type and the pointer type is unqualified. */
7740 if (! offset
&& bitpos
== 0
7741 && (TYPE_MAIN_VARIANT (TREE_TYPE (type
))
7742 == TYPE_MAIN_VARIANT (TREE_TYPE (base
)))
7743 && TYPE_QUALS (type
) == TYPE_UNQUALIFIED
)
7744 return fold_convert_loc (loc
, type
,
7745 build_fold_addr_expr_loc (loc
, base
));
7748 if (TREE_CODE (op0
) == MODIFY_EXPR
7749 && TREE_CONSTANT (TREE_OPERAND (op0
, 1))
7750 /* Detect assigning a bitfield. */
7751 && !(TREE_CODE (TREE_OPERAND (op0
, 0)) == COMPONENT_REF
7753 (TREE_OPERAND (TREE_OPERAND (op0
, 0), 1))))
7755 /* Don't leave an assignment inside a conversion
7756 unless assigning a bitfield. */
7757 tem
= fold_build1_loc (loc
, code
, type
, TREE_OPERAND (op0
, 1));
7758 /* First do the assignment, then return converted constant. */
7759 tem
= build2_loc (loc
, COMPOUND_EXPR
, TREE_TYPE (tem
), op0
, tem
);
7760 TREE_NO_WARNING (tem
) = 1;
7761 TREE_USED (tem
) = 1;
7765 /* Convert (T)(x & c) into (T)x & (T)c, if c is an integer
7766 constants (if x has signed type, the sign bit cannot be set
7767 in c). This folds extension into the BIT_AND_EXPR.
7768 ??? We don't do it for BOOLEAN_TYPE or ENUMERAL_TYPE because they
7769 very likely don't have maximal range for their precision and this
7770 transformation effectively doesn't preserve non-maximal ranges. */
7771 if (TREE_CODE (type
) == INTEGER_TYPE
7772 && TREE_CODE (op0
) == BIT_AND_EXPR
7773 && TREE_CODE (TREE_OPERAND (op0
, 1)) == INTEGER_CST
)
7775 tree and_expr
= op0
;
7776 tree and0
= TREE_OPERAND (and_expr
, 0);
7777 tree and1
= TREE_OPERAND (and_expr
, 1);
7780 if (TYPE_UNSIGNED (TREE_TYPE (and_expr
))
7781 || (TYPE_PRECISION (type
)
7782 <= TYPE_PRECISION (TREE_TYPE (and_expr
))))
7784 else if (TYPE_PRECISION (TREE_TYPE (and1
))
7785 <= HOST_BITS_PER_WIDE_INT
7786 && tree_fits_uhwi_p (and1
))
7788 unsigned HOST_WIDE_INT cst
;
7790 cst
= tree_to_uhwi (and1
);
7791 cst
&= HOST_WIDE_INT_M1U
7792 << (TYPE_PRECISION (TREE_TYPE (and1
)) - 1);
7793 change
= (cst
== 0);
7795 && !flag_syntax_only
7796 && (load_extend_op (TYPE_MODE (TREE_TYPE (and0
)))
7799 tree uns
= unsigned_type_for (TREE_TYPE (and0
));
7800 and0
= fold_convert_loc (loc
, uns
, and0
);
7801 and1
= fold_convert_loc (loc
, uns
, and1
);
7806 tem
= force_fit_type (type
, wi::to_widest (and1
), 0,
7807 TREE_OVERFLOW (and1
));
7808 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
7809 fold_convert_loc (loc
, type
, and0
), tem
);
7813 /* Convert (T1)(X p+ Y) into ((T1)X p+ Y), for pointer type, when the new
7814 cast (T1)X will fold away. We assume that this happens when X itself
7816 if (POINTER_TYPE_P (type
)
7817 && TREE_CODE (arg0
) == POINTER_PLUS_EXPR
7818 && CONVERT_EXPR_P (TREE_OPERAND (arg0
, 0)))
7820 tree arg00
= TREE_OPERAND (arg0
, 0);
7821 tree arg01
= TREE_OPERAND (arg0
, 1);
7823 return fold_build_pointer_plus_loc
7824 (loc
, fold_convert_loc (loc
, type
, arg00
), arg01
);
7827 /* Convert (T1)(~(T2)X) into ~(T1)X if T1 and T2 are integral types
7828 of the same precision, and X is an integer type not narrower than
7829 types T1 or T2, i.e. the cast (T2)X isn't an extension. */
7830 if (INTEGRAL_TYPE_P (type
)
7831 && TREE_CODE (op0
) == BIT_NOT_EXPR
7832 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
7833 && CONVERT_EXPR_P (TREE_OPERAND (op0
, 0))
7834 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (op0
)))
7836 tem
= TREE_OPERAND (TREE_OPERAND (op0
, 0), 0);
7837 if (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
7838 && TYPE_PRECISION (type
) <= TYPE_PRECISION (TREE_TYPE (tem
)))
7839 return fold_build1_loc (loc
, BIT_NOT_EXPR
, type
,
7840 fold_convert_loc (loc
, type
, tem
));
7843 /* Convert (T1)(X * Y) into (T1)X * (T1)Y if T1 is narrower than the
7844 type of X and Y (integer types only). */
7845 if (INTEGRAL_TYPE_P (type
)
7846 && TREE_CODE (op0
) == MULT_EXPR
7847 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
7848 && TYPE_PRECISION (type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
7850 /* Be careful not to introduce new overflows. */
7852 if (TYPE_OVERFLOW_WRAPS (type
))
7855 mult_type
= unsigned_type_for (type
);
7857 if (TYPE_PRECISION (mult_type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
7859 tem
= fold_build2_loc (loc
, MULT_EXPR
, mult_type
,
7860 fold_convert_loc (loc
, mult_type
,
7861 TREE_OPERAND (op0
, 0)),
7862 fold_convert_loc (loc
, mult_type
,
7863 TREE_OPERAND (op0
, 1)));
7864 return fold_convert_loc (loc
, type
, tem
);
7870 case VIEW_CONVERT_EXPR
:
7871 if (TREE_CODE (op0
) == MEM_REF
)
7873 if (TYPE_ALIGN (TREE_TYPE (op0
)) != TYPE_ALIGN (type
))
7874 type
= build_aligned_type (type
, TYPE_ALIGN (TREE_TYPE (op0
)));
7875 tem
= fold_build2_loc (loc
, MEM_REF
, type
,
7876 TREE_OPERAND (op0
, 0), TREE_OPERAND (op0
, 1));
7877 REF_REVERSE_STORAGE_ORDER (tem
) = REF_REVERSE_STORAGE_ORDER (op0
);
7884 tem
= fold_negate_expr (loc
, arg0
);
7886 return fold_convert_loc (loc
, type
, tem
);
7890 /* Convert fabs((double)float) into (double)fabsf(float). */
7891 if (TREE_CODE (arg0
) == NOP_EXPR
7892 && TREE_CODE (type
) == REAL_TYPE
)
7894 tree targ0
= strip_float_extensions (arg0
);
7896 return fold_convert_loc (loc
, type
,
7897 fold_build1_loc (loc
, ABS_EXPR
,
7904 /* Convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */
7905 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
7906 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
7907 fold_convert_loc (loc
, type
,
7908 TREE_OPERAND (arg0
, 0)))))
7909 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
, tem
,
7910 fold_convert_loc (loc
, type
,
7911 TREE_OPERAND (arg0
, 1)));
7912 else if (TREE_CODE (arg0
) == BIT_XOR_EXPR
7913 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
7914 fold_convert_loc (loc
, type
,
7915 TREE_OPERAND (arg0
, 1)))))
7916 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
,
7917 fold_convert_loc (loc
, type
,
7918 TREE_OPERAND (arg0
, 0)), tem
);
7922 case TRUTH_NOT_EXPR
:
7923 /* Note that the operand of this must be an int
7924 and its values must be 0 or 1.
7925 ("true" is a fixed value perhaps depending on the language,
7926 but we don't handle values other than 1 correctly yet.) */
7927 tem
= fold_truth_not_expr (loc
, arg0
);
7930 return fold_convert_loc (loc
, type
, tem
);
7933 /* Fold *&X to X if X is an lvalue. */
7934 if (TREE_CODE (op0
) == ADDR_EXPR
)
7936 tree op00
= TREE_OPERAND (op0
, 0);
7938 || TREE_CODE (op00
) == PARM_DECL
7939 || TREE_CODE (op00
) == RESULT_DECL
)
7940 && !TREE_READONLY (op00
))
7947 } /* switch (code) */
7951 /* If the operation was a conversion do _not_ mark a resulting constant
7952 with TREE_OVERFLOW if the original constant was not. These conversions
7953 have implementation defined behavior and retaining the TREE_OVERFLOW
7954 flag here would confuse later passes such as VRP. */
7956 fold_unary_ignore_overflow_loc (location_t loc
, enum tree_code code
,
7957 tree type
, tree op0
)
7959 tree res
= fold_unary_loc (loc
, code
, type
, op0
);
7961 && TREE_CODE (res
) == INTEGER_CST
7962 && TREE_CODE (op0
) == INTEGER_CST
7963 && CONVERT_EXPR_CODE_P (code
))
7964 TREE_OVERFLOW (res
) = TREE_OVERFLOW (op0
);
7969 /* Fold a binary bitwise/truth expression of code CODE and type TYPE with
7970 operands OP0 and OP1. LOC is the location of the resulting expression.
7971 ARG0 and ARG1 are the NOP_STRIPed results of OP0 and OP1.
7972 Return the folded expression if folding is successful. Otherwise,
7973 return NULL_TREE. */
7975 fold_truth_andor (location_t loc
, enum tree_code code
, tree type
,
7976 tree arg0
, tree arg1
, tree op0
, tree op1
)
7980 /* We only do these simplifications if we are optimizing. */
7984 /* Check for things like (A || B) && (A || C). We can convert this
7985 to A || (B && C). Note that either operator can be any of the four
7986 truth and/or operations and the transformation will still be
7987 valid. Also note that we only care about order for the
7988 ANDIF and ORIF operators. If B contains side effects, this
7989 might change the truth-value of A. */
7990 if (TREE_CODE (arg0
) == TREE_CODE (arg1
)
7991 && (TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
7992 || TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
7993 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
7994 || TREE_CODE (arg0
) == TRUTH_OR_EXPR
)
7995 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg0
, 1)))
7997 tree a00
= TREE_OPERAND (arg0
, 0);
7998 tree a01
= TREE_OPERAND (arg0
, 1);
7999 tree a10
= TREE_OPERAND (arg1
, 0);
8000 tree a11
= TREE_OPERAND (arg1
, 1);
8001 int commutative
= ((TREE_CODE (arg0
) == TRUTH_OR_EXPR
8002 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
)
8003 && (code
== TRUTH_AND_EXPR
8004 || code
== TRUTH_OR_EXPR
));
8006 if (operand_equal_p (a00
, a10
, 0))
8007 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8008 fold_build2_loc (loc
, code
, type
, a01
, a11
));
8009 else if (commutative
&& operand_equal_p (a00
, a11
, 0))
8010 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8011 fold_build2_loc (loc
, code
, type
, a01
, a10
));
8012 else if (commutative
&& operand_equal_p (a01
, a10
, 0))
8013 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a01
,
8014 fold_build2_loc (loc
, code
, type
, a00
, a11
));
8016 /* This case if tricky because we must either have commutative
8017 operators or else A10 must not have side-effects. */
8019 else if ((commutative
|| ! TREE_SIDE_EFFECTS (a10
))
8020 && operand_equal_p (a01
, a11
, 0))
8021 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
8022 fold_build2_loc (loc
, code
, type
, a00
, a10
),
8026 /* See if we can build a range comparison. */
8027 if (0 != (tem
= fold_range_test (loc
, code
, type
, op0
, op1
)))
8030 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
)
8031 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
))
8033 tem
= merge_truthop_with_opposite_arm (loc
, arg0
, arg1
, true);
8035 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
8038 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ORIF_EXPR
)
8039 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ANDIF_EXPR
))
8041 tem
= merge_truthop_with_opposite_arm (loc
, arg1
, arg0
, false);
8043 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
8046 /* Check for the possibility of merging component references. If our
8047 lhs is another similar operation, try to merge its rhs with our
8048 rhs. Then try to merge our lhs and rhs. */
8049 if (TREE_CODE (arg0
) == code
8050 && 0 != (tem
= fold_truth_andor_1 (loc
, code
, type
,
8051 TREE_OPERAND (arg0
, 1), arg1
)))
8052 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0), tem
);
8054 if ((tem
= fold_truth_andor_1 (loc
, code
, type
, arg0
, arg1
)) != 0)
8057 if (LOGICAL_OP_NON_SHORT_CIRCUIT
8058 && (code
== TRUTH_AND_EXPR
8059 || code
== TRUTH_ANDIF_EXPR
8060 || code
== TRUTH_OR_EXPR
8061 || code
== TRUTH_ORIF_EXPR
))
8063 enum tree_code ncode
, icode
;
8065 ncode
= (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_AND_EXPR
)
8066 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
;
8067 icode
= ncode
== TRUTH_AND_EXPR
? TRUTH_ANDIF_EXPR
: TRUTH_ORIF_EXPR
;
8069 /* Transform ((A AND-IF B) AND[-IF] C) into (A AND-IF (B AND C)),
8070 or ((A OR-IF B) OR[-IF] C) into (A OR-IF (B OR C))
8071 We don't want to pack more than two leafs to a non-IF AND/OR
8073 If tree-code of left-hand operand isn't an AND/OR-IF code and not
8074 equal to IF-CODE, then we don't want to add right-hand operand.
8075 If the inner right-hand side of left-hand operand has
8076 side-effects, or isn't simple, then we can't add to it,
8077 as otherwise we might destroy if-sequence. */
8078 if (TREE_CODE (arg0
) == icode
8079 && simple_operand_p_2 (arg1
)
8080 /* Needed for sequence points to handle trappings, and
8082 && simple_operand_p_2 (TREE_OPERAND (arg0
, 1)))
8084 tem
= fold_build2_loc (loc
, ncode
, type
, TREE_OPERAND (arg0
, 1),
8086 return fold_build2_loc (loc
, icode
, type
, TREE_OPERAND (arg0
, 0),
8089 /* Same as above but for (A AND[-IF] (B AND-IF C)) -> ((A AND B) AND-IF C),
8090 or (A OR[-IF] (B OR-IF C) -> ((A OR B) OR-IF C). */
8091 else if (TREE_CODE (arg1
) == icode
8092 && simple_operand_p_2 (arg0
)
8093 /* Needed for sequence points to handle trappings, and
8095 && simple_operand_p_2 (TREE_OPERAND (arg1
, 0)))
8097 tem
= fold_build2_loc (loc
, ncode
, type
,
8098 arg0
, TREE_OPERAND (arg1
, 0));
8099 return fold_build2_loc (loc
, icode
, type
, tem
,
8100 TREE_OPERAND (arg1
, 1));
8102 /* Transform (A AND-IF B) into (A AND B), or (A OR-IF B)
8104 For sequence point consistancy, we need to check for trapping,
8105 and side-effects. */
8106 else if (code
== icode
&& simple_operand_p_2 (arg0
)
8107 && simple_operand_p_2 (arg1
))
8108 return fold_build2_loc (loc
, ncode
, type
, arg0
, arg1
);
8114 /* Helper that tries to canonicalize the comparison ARG0 CODE ARG1
8115 by changing CODE to reduce the magnitude of constants involved in
8116 ARG0 of the comparison.
8117 Returns a canonicalized comparison tree if a simplification was
8118 possible, otherwise returns NULL_TREE.
8119 Set *STRICT_OVERFLOW_P to true if the canonicalization is only
8120 valid if signed overflow is undefined. */
8123 maybe_canonicalize_comparison_1 (location_t loc
, enum tree_code code
, tree type
,
8124 tree arg0
, tree arg1
,
8125 bool *strict_overflow_p
)
8127 enum tree_code code0
= TREE_CODE (arg0
);
8128 tree t
, cst0
= NULL_TREE
;
8131 /* Match A +- CST code arg1. We can change this only if overflow
8133 if (!((ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
8134 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
)))
8135 /* In principle pointers also have undefined overflow behavior,
8136 but that causes problems elsewhere. */
8137 && !POINTER_TYPE_P (TREE_TYPE (arg0
))
8138 && (code0
== MINUS_EXPR
8139 || code0
== PLUS_EXPR
)
8140 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
))
8143 /* Identify the constant in arg0 and its sign. */
8144 cst0
= TREE_OPERAND (arg0
, 1);
8145 sgn0
= tree_int_cst_sgn (cst0
);
8147 /* Overflowed constants and zero will cause problems. */
8148 if (integer_zerop (cst0
)
8149 || TREE_OVERFLOW (cst0
))
8152 /* See if we can reduce the magnitude of the constant in
8153 arg0 by changing the comparison code. */
8154 /* A - CST < arg1 -> A - CST-1 <= arg1. */
8156 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
8158 /* A + CST > arg1 -> A + CST-1 >= arg1. */
8159 else if (code
== GT_EXPR
8160 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
8162 /* A + CST <= arg1 -> A + CST-1 < arg1. */
8163 else if (code
== LE_EXPR
8164 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
8166 /* A - CST >= arg1 -> A - CST-1 > arg1. */
8167 else if (code
== GE_EXPR
8168 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
8172 *strict_overflow_p
= true;
8174 /* Now build the constant reduced in magnitude. But not if that
8175 would produce one outside of its types range. */
8176 if (INTEGRAL_TYPE_P (TREE_TYPE (cst0
))
8178 && TYPE_MIN_VALUE (TREE_TYPE (cst0
))
8179 && tree_int_cst_equal (cst0
, TYPE_MIN_VALUE (TREE_TYPE (cst0
))))
8181 && TYPE_MAX_VALUE (TREE_TYPE (cst0
))
8182 && tree_int_cst_equal (cst0
, TYPE_MAX_VALUE (TREE_TYPE (cst0
))))))
8185 t
= int_const_binop (sgn0
== -1 ? PLUS_EXPR
: MINUS_EXPR
,
8186 cst0
, build_int_cst (TREE_TYPE (cst0
), 1));
8187 t
= fold_build2_loc (loc
, code0
, TREE_TYPE (arg0
), TREE_OPERAND (arg0
, 0), t
);
8188 t
= fold_convert (TREE_TYPE (arg1
), t
);
8190 return fold_build2_loc (loc
, code
, type
, t
, arg1
);
8193 /* Canonicalize the comparison ARG0 CODE ARG1 with type TYPE with undefined
8194 overflow further. Try to decrease the magnitude of constants involved
8195 by changing LE_EXPR and GE_EXPR to LT_EXPR and GT_EXPR or vice versa
8196 and put sole constants at the second argument position.
8197 Returns the canonicalized tree if changed, otherwise NULL_TREE. */
8200 maybe_canonicalize_comparison (location_t loc
, enum tree_code code
, tree type
,
8201 tree arg0
, tree arg1
)
8204 bool strict_overflow_p
;
8205 const char * const warnmsg
= G_("assuming signed overflow does not occur "
8206 "when reducing constant in comparison");
8208 /* Try canonicalization by simplifying arg0. */
8209 strict_overflow_p
= false;
8210 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg0
, arg1
,
8211 &strict_overflow_p
);
8214 if (strict_overflow_p
)
8215 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
8219 /* Try canonicalization by simplifying arg1 using the swapped
8221 code
= swap_tree_comparison (code
);
8222 strict_overflow_p
= false;
8223 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg1
, arg0
,
8224 &strict_overflow_p
);
8225 if (t
&& strict_overflow_p
)
8226 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
8230 /* Return whether BASE + OFFSET + BITPOS may wrap around the address
8231 space. This is used to avoid issuing overflow warnings for
8232 expressions like &p->x which can not wrap. */
8235 pointer_may_wrap_p (tree base
, tree offset
, HOST_WIDE_INT bitpos
)
8237 if (!POINTER_TYPE_P (TREE_TYPE (base
)))
8244 int precision
= TYPE_PRECISION (TREE_TYPE (base
));
8245 if (offset
== NULL_TREE
)
8246 wi_offset
= wi::zero (precision
);
8247 else if (TREE_CODE (offset
) != INTEGER_CST
|| TREE_OVERFLOW (offset
))
8253 wide_int units
= wi::shwi (bitpos
/ BITS_PER_UNIT
, precision
);
8254 wide_int total
= wi::add (wi_offset
, units
, UNSIGNED
, &overflow
);
8258 if (!wi::fits_uhwi_p (total
))
8261 HOST_WIDE_INT size
= int_size_in_bytes (TREE_TYPE (TREE_TYPE (base
)));
8265 /* We can do slightly better for SIZE if we have an ADDR_EXPR of an
8267 if (TREE_CODE (base
) == ADDR_EXPR
)
8269 HOST_WIDE_INT base_size
;
8271 base_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (base
, 0)));
8272 if (base_size
> 0 && size
< base_size
)
8276 return total
.to_uhwi () > (unsigned HOST_WIDE_INT
) size
;
8279 /* Return a positive integer when the symbol DECL is known to have
8280 a nonzero address, zero when it's known not to (e.g., it's a weak
8281 symbol), and a negative integer when the symbol is not yet in the
8282 symbol table and so whether or not its address is zero is unknown.
8283 For function local objects always return positive integer. */
8285 maybe_nonzero_address (tree decl
)
8287 if (DECL_P (decl
) && decl_in_symtab_p (decl
))
8288 if (struct symtab_node
*symbol
= symtab_node::get_create (decl
))
8289 return symbol
->nonzero_address ();
8291 /* Function local objects are never NULL. */
8293 && (DECL_CONTEXT (decl
)
8294 && TREE_CODE (DECL_CONTEXT (decl
)) == FUNCTION_DECL
8295 && auto_var_in_fn_p (decl
, DECL_CONTEXT (decl
))))
8301 /* Subroutine of fold_binary. This routine performs all of the
8302 transformations that are common to the equality/inequality
8303 operators (EQ_EXPR and NE_EXPR) and the ordering operators
8304 (LT_EXPR, LE_EXPR, GE_EXPR and GT_EXPR). Callers other than
8305 fold_binary should call fold_binary. Fold a comparison with
8306 tree code CODE and type TYPE with operands OP0 and OP1. Return
8307 the folded comparison or NULL_TREE. */
8310 fold_comparison (location_t loc
, enum tree_code code
, tree type
,
8313 const bool equality_code
= (code
== EQ_EXPR
|| code
== NE_EXPR
);
8314 tree arg0
, arg1
, tem
;
8319 STRIP_SIGN_NOPS (arg0
);
8320 STRIP_SIGN_NOPS (arg1
);
8322 /* For comparisons of pointers we can decompose it to a compile time
8323 comparison of the base objects and the offsets into the object.
8324 This requires at least one operand being an ADDR_EXPR or a
8325 POINTER_PLUS_EXPR to do more than the operand_equal_p test below. */
8326 if (POINTER_TYPE_P (TREE_TYPE (arg0
))
8327 && (TREE_CODE (arg0
) == ADDR_EXPR
8328 || TREE_CODE (arg1
) == ADDR_EXPR
8329 || TREE_CODE (arg0
) == POINTER_PLUS_EXPR
8330 || TREE_CODE (arg1
) == POINTER_PLUS_EXPR
))
8332 tree base0
, base1
, offset0
= NULL_TREE
, offset1
= NULL_TREE
;
8333 HOST_WIDE_INT bitsize
, bitpos0
= 0, bitpos1
= 0;
8335 int volatilep
, reversep
, unsignedp
;
8336 bool indirect_base0
= false, indirect_base1
= false;
8338 /* Get base and offset for the access. Strip ADDR_EXPR for
8339 get_inner_reference, but put it back by stripping INDIRECT_REF
8340 off the base object if possible. indirect_baseN will be true
8341 if baseN is not an address but refers to the object itself. */
8343 if (TREE_CODE (arg0
) == ADDR_EXPR
)
8346 = get_inner_reference (TREE_OPERAND (arg0
, 0),
8347 &bitsize
, &bitpos0
, &offset0
, &mode
,
8348 &unsignedp
, &reversep
, &volatilep
);
8349 if (TREE_CODE (base0
) == INDIRECT_REF
)
8350 base0
= TREE_OPERAND (base0
, 0);
8352 indirect_base0
= true;
8354 else if (TREE_CODE (arg0
) == POINTER_PLUS_EXPR
)
8356 base0
= TREE_OPERAND (arg0
, 0);
8357 STRIP_SIGN_NOPS (base0
);
8358 if (TREE_CODE (base0
) == ADDR_EXPR
)
8361 = get_inner_reference (TREE_OPERAND (base0
, 0),
8362 &bitsize
, &bitpos0
, &offset0
, &mode
,
8363 &unsignedp
, &reversep
, &volatilep
);
8364 if (TREE_CODE (base0
) == INDIRECT_REF
)
8365 base0
= TREE_OPERAND (base0
, 0);
8367 indirect_base0
= true;
8369 if (offset0
== NULL_TREE
|| integer_zerop (offset0
))
8370 offset0
= TREE_OPERAND (arg0
, 1);
8372 offset0
= size_binop (PLUS_EXPR
, offset0
,
8373 TREE_OPERAND (arg0
, 1));
8374 if (TREE_CODE (offset0
) == INTEGER_CST
)
8376 offset_int tem
= wi::sext (wi::to_offset (offset0
),
8377 TYPE_PRECISION (sizetype
));
8378 tem
<<= LOG2_BITS_PER_UNIT
;
8380 if (wi::fits_shwi_p (tem
))
8382 bitpos0
= tem
.to_shwi ();
8383 offset0
= NULL_TREE
;
8389 if (TREE_CODE (arg1
) == ADDR_EXPR
)
8392 = get_inner_reference (TREE_OPERAND (arg1
, 0),
8393 &bitsize
, &bitpos1
, &offset1
, &mode
,
8394 &unsignedp
, &reversep
, &volatilep
);
8395 if (TREE_CODE (base1
) == INDIRECT_REF
)
8396 base1
= TREE_OPERAND (base1
, 0);
8398 indirect_base1
= true;
8400 else if (TREE_CODE (arg1
) == POINTER_PLUS_EXPR
)
8402 base1
= TREE_OPERAND (arg1
, 0);
8403 STRIP_SIGN_NOPS (base1
);
8404 if (TREE_CODE (base1
) == ADDR_EXPR
)
8407 = get_inner_reference (TREE_OPERAND (base1
, 0),
8408 &bitsize
, &bitpos1
, &offset1
, &mode
,
8409 &unsignedp
, &reversep
, &volatilep
);
8410 if (TREE_CODE (base1
) == INDIRECT_REF
)
8411 base1
= TREE_OPERAND (base1
, 0);
8413 indirect_base1
= true;
8415 if (offset1
== NULL_TREE
|| integer_zerop (offset1
))
8416 offset1
= TREE_OPERAND (arg1
, 1);
8418 offset1
= size_binop (PLUS_EXPR
, offset1
,
8419 TREE_OPERAND (arg1
, 1));
8420 if (TREE_CODE (offset1
) == INTEGER_CST
)
8422 offset_int tem
= wi::sext (wi::to_offset (offset1
),
8423 TYPE_PRECISION (sizetype
));
8424 tem
<<= LOG2_BITS_PER_UNIT
;
8426 if (wi::fits_shwi_p (tem
))
8428 bitpos1
= tem
.to_shwi ();
8429 offset1
= NULL_TREE
;
8434 /* If we have equivalent bases we might be able to simplify. */
8435 if (indirect_base0
== indirect_base1
8436 && operand_equal_p (base0
, base1
,
8437 indirect_base0
? OEP_ADDRESS_OF
: 0))
8439 /* We can fold this expression to a constant if the non-constant
8440 offset parts are equal. */
8441 if ((offset0
== offset1
8442 || (offset0
&& offset1
8443 && operand_equal_p (offset0
, offset1
, 0)))
8446 && (DECL_P (base0
) || CONSTANT_CLASS_P (base0
)))
8447 || POINTER_TYPE_OVERFLOW_UNDEFINED
))
8451 && bitpos0
!= bitpos1
8452 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
8453 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
8454 fold_overflow_warning (("assuming pointer wraparound does not "
8455 "occur when comparing P +- C1 with "
8457 WARN_STRICT_OVERFLOW_CONDITIONAL
);
8462 return constant_boolean_node (bitpos0
== bitpos1
, type
);
8464 return constant_boolean_node (bitpos0
!= bitpos1
, type
);
8466 return constant_boolean_node (bitpos0
< bitpos1
, type
);
8468 return constant_boolean_node (bitpos0
<= bitpos1
, type
);
8470 return constant_boolean_node (bitpos0
>= bitpos1
, type
);
8472 return constant_boolean_node (bitpos0
> bitpos1
, type
);
8476 /* We can simplify the comparison to a comparison of the variable
8477 offset parts if the constant offset parts are equal.
8478 Be careful to use signed sizetype here because otherwise we
8479 mess with array offsets in the wrong way. This is possible
8480 because pointer arithmetic is restricted to retain within an
8481 object and overflow on pointer differences is undefined as of
8482 6.5.6/8 and /9 with respect to the signed ptrdiff_t. */
8483 else if (bitpos0
== bitpos1
8486 && (DECL_P (base0
) || CONSTANT_CLASS_P (base0
)))
8487 || POINTER_TYPE_OVERFLOW_UNDEFINED
))
8489 /* By converting to signed sizetype we cover middle-end pointer
8490 arithmetic which operates on unsigned pointer types of size
8491 type size and ARRAY_REF offsets which are properly sign or
8492 zero extended from their type in case it is narrower than
8494 if (offset0
== NULL_TREE
)
8495 offset0
= build_int_cst (ssizetype
, 0);
8497 offset0
= fold_convert_loc (loc
, ssizetype
, offset0
);
8498 if (offset1
== NULL_TREE
)
8499 offset1
= build_int_cst (ssizetype
, 0);
8501 offset1
= fold_convert_loc (loc
, ssizetype
, offset1
);
8504 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
8505 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
8506 fold_overflow_warning (("assuming pointer wraparound does not "
8507 "occur when comparing P +- C1 with "
8509 WARN_STRICT_OVERFLOW_COMPARISON
);
8511 return fold_build2_loc (loc
, code
, type
, offset0
, offset1
);
8514 /* For equal offsets we can simplify to a comparison of the
8516 else if (bitpos0
== bitpos1
8518 ? base0
!= TREE_OPERAND (arg0
, 0) : base0
!= arg0
)
8520 ? base1
!= TREE_OPERAND (arg1
, 0) : base1
!= arg1
)
8521 && ((offset0
== offset1
)
8522 || (offset0
&& offset1
8523 && operand_equal_p (offset0
, offset1
, 0))))
8526 base0
= build_fold_addr_expr_loc (loc
, base0
);
8528 base1
= build_fold_addr_expr_loc (loc
, base1
);
8529 return fold_build2_loc (loc
, code
, type
, base0
, base1
);
8531 /* Comparison between an ordinary (non-weak) symbol and a null
8532 pointer can be eliminated since such symbols must have a non
8533 null address. In C, relational expressions between pointers
8534 to objects and null pointers are undefined. The results
8535 below follow the C++ rules with the additional property that
8536 every object pointer compares greater than a null pointer.
8538 else if (((DECL_P (base0
)
8539 && maybe_nonzero_address (base0
) > 0
8540 /* Avoid folding references to struct members at offset 0 to
8541 prevent tests like '&ptr->firstmember == 0' from getting
8542 eliminated. When ptr is null, although the -> expression
8543 is strictly speaking invalid, GCC retains it as a matter
8544 of QoI. See PR c/44555. */
8545 && (offset0
== NULL_TREE
&& bitpos0
!= 0))
8546 || CONSTANT_CLASS_P (base0
))
8548 /* The caller guarantees that when one of the arguments is
8549 constant (i.e., null in this case) it is second. */
8550 && integer_zerop (arg1
))
8557 return constant_boolean_node (false, type
);
8561 return constant_boolean_node (true, type
);
8568 /* Transform comparisons of the form X +- C1 CMP Y +- C2 to
8569 X CMP Y +- C2 +- C1 for signed X, Y. This is valid if
8570 the resulting offset is smaller in absolute value than the
8571 original one and has the same sign. */
8572 if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
8573 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))
8574 && (TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
8575 && (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
8576 && !TREE_OVERFLOW (TREE_OPERAND (arg0
, 1)))
8577 && (TREE_CODE (arg1
) == PLUS_EXPR
|| TREE_CODE (arg1
) == MINUS_EXPR
)
8578 && (TREE_CODE (TREE_OPERAND (arg1
, 1)) == INTEGER_CST
8579 && !TREE_OVERFLOW (TREE_OPERAND (arg1
, 1))))
8581 tree const1
= TREE_OPERAND (arg0
, 1);
8582 tree const2
= TREE_OPERAND (arg1
, 1);
8583 tree variable1
= TREE_OPERAND (arg0
, 0);
8584 tree variable2
= TREE_OPERAND (arg1
, 0);
8586 const char * const warnmsg
= G_("assuming signed overflow does not "
8587 "occur when combining constants around "
8590 /* Put the constant on the side where it doesn't overflow and is
8591 of lower absolute value and of same sign than before. */
8592 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
8593 ? MINUS_EXPR
: PLUS_EXPR
,
8595 if (!TREE_OVERFLOW (cst
)
8596 && tree_int_cst_compare (const2
, cst
) == tree_int_cst_sgn (const2
)
8597 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const2
))
8599 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
8600 return fold_build2_loc (loc
, code
, type
,
8602 fold_build2_loc (loc
, TREE_CODE (arg1
),
8607 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
8608 ? MINUS_EXPR
: PLUS_EXPR
,
8610 if (!TREE_OVERFLOW (cst
)
8611 && tree_int_cst_compare (const1
, cst
) == tree_int_cst_sgn (const1
)
8612 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const1
))
8614 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
8615 return fold_build2_loc (loc
, code
, type
,
8616 fold_build2_loc (loc
, TREE_CODE (arg0
),
8623 tem
= maybe_canonicalize_comparison (loc
, code
, type
, arg0
, arg1
);
8627 /* If we are comparing an expression that just has comparisons
8628 of two integer values, arithmetic expressions of those comparisons,
8629 and constants, we can simplify it. There are only three cases
8630 to check: the two values can either be equal, the first can be
8631 greater, or the second can be greater. Fold the expression for
8632 those three values. Since each value must be 0 or 1, we have
8633 eight possibilities, each of which corresponds to the constant 0
8634 or 1 or one of the six possible comparisons.
8636 This handles common cases like (a > b) == 0 but also handles
8637 expressions like ((x > y) - (y > x)) > 0, which supposedly
8638 occur in macroized code. */
8640 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) != INTEGER_CST
)
8642 tree cval1
= 0, cval2
= 0;
8645 if (twoval_comparison_p (arg0
, &cval1
, &cval2
, &save_p
)
8646 /* Don't handle degenerate cases here; they should already
8647 have been handled anyway. */
8648 && cval1
!= 0 && cval2
!= 0
8649 && ! (TREE_CONSTANT (cval1
) && TREE_CONSTANT (cval2
))
8650 && TREE_TYPE (cval1
) == TREE_TYPE (cval2
)
8651 && INTEGRAL_TYPE_P (TREE_TYPE (cval1
))
8652 && TYPE_MAX_VALUE (TREE_TYPE (cval1
))
8653 && TYPE_MAX_VALUE (TREE_TYPE (cval2
))
8654 && ! operand_equal_p (TYPE_MIN_VALUE (TREE_TYPE (cval1
)),
8655 TYPE_MAX_VALUE (TREE_TYPE (cval2
)), 0))
8657 tree maxval
= TYPE_MAX_VALUE (TREE_TYPE (cval1
));
8658 tree minval
= TYPE_MIN_VALUE (TREE_TYPE (cval1
));
8660 /* We can't just pass T to eval_subst in case cval1 or cval2
8661 was the same as ARG1. */
8664 = fold_build2_loc (loc
, code
, type
,
8665 eval_subst (loc
, arg0
, cval1
, maxval
,
8669 = fold_build2_loc (loc
, code
, type
,
8670 eval_subst (loc
, arg0
, cval1
, maxval
,
8674 = fold_build2_loc (loc
, code
, type
,
8675 eval_subst (loc
, arg0
, cval1
, minval
,
8679 /* All three of these results should be 0 or 1. Confirm they are.
8680 Then use those values to select the proper code to use. */
8682 if (TREE_CODE (high_result
) == INTEGER_CST
8683 && TREE_CODE (equal_result
) == INTEGER_CST
8684 && TREE_CODE (low_result
) == INTEGER_CST
)
8686 /* Make a 3-bit mask with the high-order bit being the
8687 value for `>', the next for '=', and the low for '<'. */
8688 switch ((integer_onep (high_result
) * 4)
8689 + (integer_onep (equal_result
) * 2)
8690 + integer_onep (low_result
))
8694 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
8715 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
8720 tem
= save_expr (build2 (code
, type
, cval1
, cval2
));
8721 protected_set_expr_location (tem
, loc
);
8724 return fold_build2_loc (loc
, code
, type
, cval1
, cval2
);
8729 /* We can fold X/C1 op C2 where C1 and C2 are integer constants
8730 into a single range test. */
8731 if (TREE_CODE (arg0
) == TRUNC_DIV_EXPR
8732 && TREE_CODE (arg1
) == INTEGER_CST
8733 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
8734 && !integer_zerop (TREE_OPERAND (arg0
, 1))
8735 && !TREE_OVERFLOW (TREE_OPERAND (arg0
, 1))
8736 && !TREE_OVERFLOW (arg1
))
8738 tem
= fold_div_compare (loc
, code
, type
, arg0
, arg1
);
8739 if (tem
!= NULL_TREE
)
8747 /* Subroutine of fold_binary. Optimize complex multiplications of the
8748 form z * conj(z), as pow(realpart(z),2) + pow(imagpart(z),2). The
8749 argument EXPR represents the expression "z" of type TYPE. */
8752 fold_mult_zconjz (location_t loc
, tree type
, tree expr
)
8754 tree itype
= TREE_TYPE (type
);
8755 tree rpart
, ipart
, tem
;
8757 if (TREE_CODE (expr
) == COMPLEX_EXPR
)
8759 rpart
= TREE_OPERAND (expr
, 0);
8760 ipart
= TREE_OPERAND (expr
, 1);
8762 else if (TREE_CODE (expr
) == COMPLEX_CST
)
8764 rpart
= TREE_REALPART (expr
);
8765 ipart
= TREE_IMAGPART (expr
);
8769 expr
= save_expr (expr
);
8770 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, itype
, expr
);
8771 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, itype
, expr
);
8774 rpart
= save_expr (rpart
);
8775 ipart
= save_expr (ipart
);
8776 tem
= fold_build2_loc (loc
, PLUS_EXPR
, itype
,
8777 fold_build2_loc (loc
, MULT_EXPR
, itype
, rpart
, rpart
),
8778 fold_build2_loc (loc
, MULT_EXPR
, itype
, ipart
, ipart
));
8779 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, tem
,
8780 build_zero_cst (itype
));
8784 /* Helper function for fold_vec_perm. Store elements of VECTOR_CST or
8785 CONSTRUCTOR ARG into array ELTS and return true if successful. */
8788 vec_cst_ctor_to_array (tree arg
, tree
*elts
)
8790 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg
)), i
;
8792 if (TREE_CODE (arg
) == VECTOR_CST
)
8794 for (i
= 0; i
< VECTOR_CST_NELTS (arg
); ++i
)
8795 elts
[i
] = VECTOR_CST_ELT (arg
, i
);
8797 else if (TREE_CODE (arg
) == CONSTRUCTOR
)
8799 constructor_elt
*elt
;
8801 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (arg
), i
, elt
)
8802 if (i
>= nelts
|| TREE_CODE (TREE_TYPE (elt
->value
)) == VECTOR_TYPE
)
8805 elts
[i
] = elt
->value
;
8809 for (; i
< nelts
; i
++)
8811 = fold_convert (TREE_TYPE (TREE_TYPE (arg
)), integer_zero_node
);
8815 /* Attempt to fold vector permutation of ARG0 and ARG1 vectors using SEL
8816 selector. Return the folded VECTOR_CST or CONSTRUCTOR if successful,
8817 NULL_TREE otherwise. */
8820 fold_vec_perm (tree type
, tree arg0
, tree arg1
, const unsigned char *sel
)
8822 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
8824 bool need_ctor
= false;
8826 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)) == nelts
8827 && TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)) == nelts
);
8828 if (TREE_TYPE (TREE_TYPE (arg0
)) != TREE_TYPE (type
)
8829 || TREE_TYPE (TREE_TYPE (arg1
)) != TREE_TYPE (type
))
8832 elts
= XALLOCAVEC (tree
, nelts
* 3);
8833 if (!vec_cst_ctor_to_array (arg0
, elts
)
8834 || !vec_cst_ctor_to_array (arg1
, elts
+ nelts
))
8837 for (i
= 0; i
< nelts
; i
++)
8839 if (!CONSTANT_CLASS_P (elts
[sel
[i
]]))
8841 elts
[i
+ 2 * nelts
] = unshare_expr (elts
[sel
[i
]]);
8846 vec
<constructor_elt
, va_gc
> *v
;
8847 vec_alloc (v
, nelts
);
8848 for (i
= 0; i
< nelts
; i
++)
8849 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, elts
[2 * nelts
+ i
]);
8850 return build_constructor (type
, v
);
8853 return build_vector (type
, &elts
[2 * nelts
]);
8856 /* Try to fold a pointer difference of type TYPE two address expressions of
8857 array references AREF0 and AREF1 using location LOC. Return a
8858 simplified expression for the difference or NULL_TREE. */
8861 fold_addr_of_array_ref_difference (location_t loc
, tree type
,
8862 tree aref0
, tree aref1
)
8864 tree base0
= TREE_OPERAND (aref0
, 0);
8865 tree base1
= TREE_OPERAND (aref1
, 0);
8866 tree base_offset
= build_int_cst (type
, 0);
8868 /* If the bases are array references as well, recurse. If the bases
8869 are pointer indirections compute the difference of the pointers.
8870 If the bases are equal, we are set. */
8871 if ((TREE_CODE (base0
) == ARRAY_REF
8872 && TREE_CODE (base1
) == ARRAY_REF
8874 = fold_addr_of_array_ref_difference (loc
, type
, base0
, base1
)))
8875 || (INDIRECT_REF_P (base0
)
8876 && INDIRECT_REF_P (base1
)
8878 = fold_binary_loc (loc
, MINUS_EXPR
, type
,
8879 fold_convert (type
, TREE_OPERAND (base0
, 0)),
8881 TREE_OPERAND (base1
, 0)))))
8882 || operand_equal_p (base0
, base1
, OEP_ADDRESS_OF
))
8884 tree op0
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref0
, 1));
8885 tree op1
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref1
, 1));
8886 tree esz
= fold_convert_loc (loc
, type
, array_ref_element_size (aref0
));
8887 tree diff
= build2 (MINUS_EXPR
, type
, op0
, op1
);
8888 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
8890 fold_build2_loc (loc
, MULT_EXPR
, type
,
8896 /* If the real or vector real constant CST of type TYPE has an exact
8897 inverse, return it, else return NULL. */
8900 exact_inverse (tree type
, tree cst
)
8903 tree unit_type
, *elts
;
8905 unsigned vec_nelts
, i
;
8907 switch (TREE_CODE (cst
))
8910 r
= TREE_REAL_CST (cst
);
8912 if (exact_real_inverse (TYPE_MODE (type
), &r
))
8913 return build_real (type
, r
);
8918 vec_nelts
= VECTOR_CST_NELTS (cst
);
8919 elts
= XALLOCAVEC (tree
, vec_nelts
);
8920 unit_type
= TREE_TYPE (type
);
8921 mode
= TYPE_MODE (unit_type
);
8923 for (i
= 0; i
< vec_nelts
; i
++)
8925 r
= TREE_REAL_CST (VECTOR_CST_ELT (cst
, i
));
8926 if (!exact_real_inverse (mode
, &r
))
8928 elts
[i
] = build_real (unit_type
, r
);
8931 return build_vector (type
, elts
);
8938 /* Mask out the tz least significant bits of X of type TYPE where
8939 tz is the number of trailing zeroes in Y. */
8941 mask_with_tz (tree type
, const wide_int
&x
, const wide_int
&y
)
8943 int tz
= wi::ctz (y
);
8945 return wi::mask (tz
, true, TYPE_PRECISION (type
)) & x
;
8949 /* Return true when T is an address and is known to be nonzero.
8950 For floating point we further ensure that T is not denormal.
8951 Similar logic is present in nonzero_address in rtlanal.h.
8953 If the return value is based on the assumption that signed overflow
8954 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
8955 change *STRICT_OVERFLOW_P. */
8958 tree_expr_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
8960 tree type
= TREE_TYPE (t
);
8961 enum tree_code code
;
8963 /* Doing something useful for floating point would need more work. */
8964 if (!INTEGRAL_TYPE_P (type
) && !POINTER_TYPE_P (type
))
8967 code
= TREE_CODE (t
);
8968 switch (TREE_CODE_CLASS (code
))
8971 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
8974 case tcc_comparison
:
8975 return tree_binary_nonzero_warnv_p (code
, type
,
8976 TREE_OPERAND (t
, 0),
8977 TREE_OPERAND (t
, 1),
8980 case tcc_declaration
:
8982 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
8990 case TRUTH_NOT_EXPR
:
8991 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
8994 case TRUTH_AND_EXPR
:
8996 case TRUTH_XOR_EXPR
:
8997 return tree_binary_nonzero_warnv_p (code
, type
,
8998 TREE_OPERAND (t
, 0),
8999 TREE_OPERAND (t
, 1),
9007 case WITH_SIZE_EXPR
:
9009 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
9014 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
9018 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 0),
9023 tree fndecl
= get_callee_fndecl (t
);
9024 if (!fndecl
) return false;
9025 if (flag_delete_null_pointer_checks
&& !flag_check_new
9026 && DECL_IS_OPERATOR_NEW (fndecl
)
9027 && !TREE_NOTHROW (fndecl
))
9029 if (flag_delete_null_pointer_checks
9030 && lookup_attribute ("returns_nonnull",
9031 TYPE_ATTRIBUTES (TREE_TYPE (fndecl
))))
9033 return alloca_call_p (t
);
9042 /* Return true when T is an address and is known to be nonzero.
9043 Handle warnings about undefined signed overflow. */
9046 tree_expr_nonzero_p (tree t
)
9048 bool ret
, strict_overflow_p
;
9050 strict_overflow_p
= false;
9051 ret
= tree_expr_nonzero_warnv_p (t
, &strict_overflow_p
);
9052 if (strict_overflow_p
)
9053 fold_overflow_warning (("assuming signed overflow does not occur when "
9054 "determining that expression is always "
9056 WARN_STRICT_OVERFLOW_MISC
);
9060 /* Return true if T is known not to be equal to an integer W. */
9063 expr_not_equal_to (tree t
, const wide_int
&w
)
9065 wide_int min
, max
, nz
;
9066 value_range_type rtype
;
9067 switch (TREE_CODE (t
))
9070 return wi::ne_p (t
, w
);
9073 if (!INTEGRAL_TYPE_P (TREE_TYPE (t
)))
9075 rtype
= get_range_info (t
, &min
, &max
);
9076 if (rtype
== VR_RANGE
)
9078 if (wi::lt_p (max
, w
, TYPE_SIGN (TREE_TYPE (t
))))
9080 if (wi::lt_p (w
, min
, TYPE_SIGN (TREE_TYPE (t
))))
9083 else if (rtype
== VR_ANTI_RANGE
9084 && wi::le_p (min
, w
, TYPE_SIGN (TREE_TYPE (t
)))
9085 && wi::le_p (w
, max
, TYPE_SIGN (TREE_TYPE (t
))))
9087 /* If T has some known zero bits and W has any of those bits set,
9088 then T is known not to be equal to W. */
9089 if (wi::ne_p (wi::zext (wi::bit_and_not (w
, get_nonzero_bits (t
)),
9090 TYPE_PRECISION (TREE_TYPE (t
))), 0))
9099 /* Fold a binary expression of code CODE and type TYPE with operands
9100 OP0 and OP1. LOC is the location of the resulting expression.
9101 Return the folded expression if folding is successful. Otherwise,
9102 return NULL_TREE. */
9105 fold_binary_loc (location_t loc
,
9106 enum tree_code code
, tree type
, tree op0
, tree op1
)
9108 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
9109 tree arg0
, arg1
, tem
;
9110 tree t1
= NULL_TREE
;
9111 bool strict_overflow_p
;
9114 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
9115 && TREE_CODE_LENGTH (code
) == 2
9117 && op1
!= NULL_TREE
);
9122 /* Strip any conversions that don't change the mode. This is
9123 safe for every expression, except for a comparison expression
9124 because its signedness is derived from its operands. So, in
9125 the latter case, only strip conversions that don't change the
9126 signedness. MIN_EXPR/MAX_EXPR also need signedness of arguments
9129 Note that this is done as an internal manipulation within the
9130 constant folder, in order to find the simplest representation
9131 of the arguments so that their form can be studied. In any
9132 cases, the appropriate type conversions should be put back in
9133 the tree that will get out of the constant folder. */
9135 if (kind
== tcc_comparison
|| code
== MIN_EXPR
|| code
== MAX_EXPR
)
9137 STRIP_SIGN_NOPS (arg0
);
9138 STRIP_SIGN_NOPS (arg1
);
9146 /* Note that TREE_CONSTANT isn't enough: static var addresses are
9147 constant but we can't do arithmetic on them. */
9148 if (CONSTANT_CLASS_P (arg0
) && CONSTANT_CLASS_P (arg1
))
9150 tem
= const_binop (code
, type
, arg0
, arg1
);
9151 if (tem
!= NULL_TREE
)
9153 if (TREE_TYPE (tem
) != type
)
9154 tem
= fold_convert_loc (loc
, type
, tem
);
9159 /* If this is a commutative operation, and ARG0 is a constant, move it
9160 to ARG1 to reduce the number of tests below. */
9161 if (commutative_tree_code (code
)
9162 && tree_swap_operands_p (arg0
, arg1
))
9163 return fold_build2_loc (loc
, code
, type
, op1
, op0
);
9165 /* Likewise if this is a comparison, and ARG0 is a constant, move it
9166 to ARG1 to reduce the number of tests below. */
9167 if (kind
== tcc_comparison
9168 && tree_swap_operands_p (arg0
, arg1
))
9169 return fold_build2_loc (loc
, swap_tree_comparison (code
), type
, op1
, op0
);
9171 tem
= generic_simplify (loc
, code
, type
, op0
, op1
);
9175 /* ARG0 is the first operand of EXPR, and ARG1 is the second operand.
9177 First check for cases where an arithmetic operation is applied to a
9178 compound, conditional, or comparison operation. Push the arithmetic
9179 operation inside the compound or conditional to see if any folding
9180 can then be done. Convert comparison to conditional for this purpose.
9181 The also optimizes non-constant cases that used to be done in
9184 Before we do that, see if this is a BIT_AND_EXPR or a BIT_IOR_EXPR,
9185 one of the operands is a comparison and the other is a comparison, a
9186 BIT_AND_EXPR with the constant 1, or a truth value. In that case, the
9187 code below would make the expression more complex. Change it to a
9188 TRUTH_{AND,OR}_EXPR. Likewise, convert a similar NE_EXPR to
9189 TRUTH_XOR_EXPR and an EQ_EXPR to the inversion of a TRUTH_XOR_EXPR. */
9191 if ((code
== BIT_AND_EXPR
|| code
== BIT_IOR_EXPR
9192 || code
== EQ_EXPR
|| code
== NE_EXPR
)
9193 && TREE_CODE (type
) != VECTOR_TYPE
9194 && ((truth_value_p (TREE_CODE (arg0
))
9195 && (truth_value_p (TREE_CODE (arg1
))
9196 || (TREE_CODE (arg1
) == BIT_AND_EXPR
9197 && integer_onep (TREE_OPERAND (arg1
, 1)))))
9198 || (truth_value_p (TREE_CODE (arg1
))
9199 && (truth_value_p (TREE_CODE (arg0
))
9200 || (TREE_CODE (arg0
) == BIT_AND_EXPR
9201 && integer_onep (TREE_OPERAND (arg0
, 1)))))))
9203 tem
= fold_build2_loc (loc
, code
== BIT_AND_EXPR
? TRUTH_AND_EXPR
9204 : code
== BIT_IOR_EXPR
? TRUTH_OR_EXPR
9207 fold_convert_loc (loc
, boolean_type_node
, arg0
),
9208 fold_convert_loc (loc
, boolean_type_node
, arg1
));
9210 if (code
== EQ_EXPR
)
9211 tem
= invert_truthvalue_loc (loc
, tem
);
9213 return fold_convert_loc (loc
, type
, tem
);
9216 if (TREE_CODE_CLASS (code
) == tcc_binary
9217 || TREE_CODE_CLASS (code
) == tcc_comparison
)
9219 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
9221 tem
= fold_build2_loc (loc
, code
, type
,
9222 fold_convert_loc (loc
, TREE_TYPE (op0
),
9223 TREE_OPERAND (arg0
, 1)), op1
);
9224 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
9227 if (TREE_CODE (arg1
) == COMPOUND_EXPR
)
9229 tem
= fold_build2_loc (loc
, code
, type
, op0
,
9230 fold_convert_loc (loc
, TREE_TYPE (op1
),
9231 TREE_OPERAND (arg1
, 1)));
9232 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg1
, 0),
9236 if (TREE_CODE (arg0
) == COND_EXPR
9237 || TREE_CODE (arg0
) == VEC_COND_EXPR
9238 || COMPARISON_CLASS_P (arg0
))
9240 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
9242 /*cond_first_p=*/1);
9243 if (tem
!= NULL_TREE
)
9247 if (TREE_CODE (arg1
) == COND_EXPR
9248 || TREE_CODE (arg1
) == VEC_COND_EXPR
9249 || COMPARISON_CLASS_P (arg1
))
9251 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
9253 /*cond_first_p=*/0);
9254 if (tem
!= NULL_TREE
)
9262 /* MEM[&MEM[p, CST1], CST2] -> MEM[p, CST1 + CST2]. */
9263 if (TREE_CODE (arg0
) == ADDR_EXPR
9264 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == MEM_REF
)
9266 tree iref
= TREE_OPERAND (arg0
, 0);
9267 return fold_build2 (MEM_REF
, type
,
9268 TREE_OPERAND (iref
, 0),
9269 int_const_binop (PLUS_EXPR
, arg1
,
9270 TREE_OPERAND (iref
, 1)));
9273 /* MEM[&a.b, CST2] -> MEM[&a, offsetof (a, b) + CST2]. */
9274 if (TREE_CODE (arg0
) == ADDR_EXPR
9275 && handled_component_p (TREE_OPERAND (arg0
, 0)))
9278 HOST_WIDE_INT coffset
;
9279 base
= get_addr_base_and_unit_offset (TREE_OPERAND (arg0
, 0),
9283 return fold_build2 (MEM_REF
, type
,
9284 build_fold_addr_expr (base
),
9285 int_const_binop (PLUS_EXPR
, arg1
,
9286 size_int (coffset
)));
9291 case POINTER_PLUS_EXPR
:
9292 /* INT +p INT -> (PTR)(INT + INT). Stripping types allows for this. */
9293 if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
9294 && INTEGRAL_TYPE_P (TREE_TYPE (arg0
)))
9295 return fold_convert_loc (loc
, type
,
9296 fold_build2_loc (loc
, PLUS_EXPR
, sizetype
,
9297 fold_convert_loc (loc
, sizetype
,
9299 fold_convert_loc (loc
, sizetype
,
9305 if (INTEGRAL_TYPE_P (type
) || VECTOR_INTEGER_TYPE_P (type
))
9307 /* X + (X / CST) * -CST is X % CST. */
9308 if (TREE_CODE (arg1
) == MULT_EXPR
9309 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == TRUNC_DIV_EXPR
9310 && operand_equal_p (arg0
,
9311 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0), 0))
9313 tree cst0
= TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1);
9314 tree cst1
= TREE_OPERAND (arg1
, 1);
9315 tree sum
= fold_binary_loc (loc
, PLUS_EXPR
, TREE_TYPE (cst1
),
9317 if (sum
&& integer_zerop (sum
))
9318 return fold_convert_loc (loc
, type
,
9319 fold_build2_loc (loc
, TRUNC_MOD_EXPR
,
9320 TREE_TYPE (arg0
), arg0
,
9325 /* Handle (A1 * C1) + (A2 * C2) with A1, A2 or C1, C2 being the same or
9326 one. Make sure the type is not saturating and has the signedness of
9327 the stripped operands, as fold_plusminus_mult_expr will re-associate.
9328 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
9329 if ((TREE_CODE (arg0
) == MULT_EXPR
9330 || TREE_CODE (arg1
) == MULT_EXPR
)
9331 && !TYPE_SATURATING (type
)
9332 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
9333 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
9334 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
9336 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
9341 if (! FLOAT_TYPE_P (type
))
9343 /* Reassociate (plus (plus (mult) (foo)) (mult)) as
9344 (plus (plus (mult) (mult)) (foo)) so that we can
9345 take advantage of the factoring cases below. */
9346 if (ANY_INTEGRAL_TYPE_P (type
)
9347 && TYPE_OVERFLOW_WRAPS (type
)
9348 && (((TREE_CODE (arg0
) == PLUS_EXPR
9349 || TREE_CODE (arg0
) == MINUS_EXPR
)
9350 && TREE_CODE (arg1
) == MULT_EXPR
)
9351 || ((TREE_CODE (arg1
) == PLUS_EXPR
9352 || TREE_CODE (arg1
) == MINUS_EXPR
)
9353 && TREE_CODE (arg0
) == MULT_EXPR
)))
9355 tree parg0
, parg1
, parg
, marg
;
9356 enum tree_code pcode
;
9358 if (TREE_CODE (arg1
) == MULT_EXPR
)
9359 parg
= arg0
, marg
= arg1
;
9361 parg
= arg1
, marg
= arg0
;
9362 pcode
= TREE_CODE (parg
);
9363 parg0
= TREE_OPERAND (parg
, 0);
9364 parg1
= TREE_OPERAND (parg
, 1);
9368 if (TREE_CODE (parg0
) == MULT_EXPR
9369 && TREE_CODE (parg1
) != MULT_EXPR
)
9370 return fold_build2_loc (loc
, pcode
, type
,
9371 fold_build2_loc (loc
, PLUS_EXPR
, type
,
9372 fold_convert_loc (loc
, type
,
9374 fold_convert_loc (loc
, type
,
9376 fold_convert_loc (loc
, type
, parg1
));
9377 if (TREE_CODE (parg0
) != MULT_EXPR
9378 && TREE_CODE (parg1
) == MULT_EXPR
)
9380 fold_build2_loc (loc
, PLUS_EXPR
, type
,
9381 fold_convert_loc (loc
, type
, parg0
),
9382 fold_build2_loc (loc
, pcode
, type
,
9383 fold_convert_loc (loc
, type
, marg
),
9384 fold_convert_loc (loc
, type
,
9390 /* Fold __complex__ ( x, 0 ) + __complex__ ( 0, y )
9391 to __complex__ ( x, y ). This is not the same for SNaNs or
9392 if signed zeros are involved. */
9393 if (!HONOR_SNANS (element_mode (arg0
))
9394 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
9395 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
9397 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
9398 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
9399 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
9400 bool arg0rz
= false, arg0iz
= false;
9401 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
9402 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
9404 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
9405 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
9406 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
9408 tree rp
= arg1r
? arg1r
9409 : build1 (REALPART_EXPR
, rtype
, arg1
);
9410 tree ip
= arg0i
? arg0i
9411 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
9412 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
9414 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
9416 tree rp
= arg0r
? arg0r
9417 : build1 (REALPART_EXPR
, rtype
, arg0
);
9418 tree ip
= arg1i
? arg1i
9419 : build1 (IMAGPART_EXPR
, rtype
, arg1
);
9420 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
9425 if (flag_unsafe_math_optimizations
9426 && (TREE_CODE (arg0
) == RDIV_EXPR
|| TREE_CODE (arg0
) == MULT_EXPR
)
9427 && (TREE_CODE (arg1
) == RDIV_EXPR
|| TREE_CODE (arg1
) == MULT_EXPR
)
9428 && (tem
= distribute_real_division (loc
, code
, type
, arg0
, arg1
)))
9431 /* Convert a + (b*c + d*e) into (a + b*c) + d*e.
9432 We associate floats only if the user has specified
9433 -fassociative-math. */
9434 if (flag_associative_math
9435 && TREE_CODE (arg1
) == PLUS_EXPR
9436 && TREE_CODE (arg0
) != MULT_EXPR
)
9438 tree tree10
= TREE_OPERAND (arg1
, 0);
9439 tree tree11
= TREE_OPERAND (arg1
, 1);
9440 if (TREE_CODE (tree11
) == MULT_EXPR
9441 && TREE_CODE (tree10
) == MULT_EXPR
)
9444 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, arg0
, tree10
);
9445 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree0
, tree11
);
9448 /* Convert (b*c + d*e) + a into b*c + (d*e +a).
9449 We associate floats only if the user has specified
9450 -fassociative-math. */
9451 if (flag_associative_math
9452 && TREE_CODE (arg0
) == PLUS_EXPR
9453 && TREE_CODE (arg1
) != MULT_EXPR
)
9455 tree tree00
= TREE_OPERAND (arg0
, 0);
9456 tree tree01
= TREE_OPERAND (arg0
, 1);
9457 if (TREE_CODE (tree01
) == MULT_EXPR
9458 && TREE_CODE (tree00
) == MULT_EXPR
)
9461 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, tree01
, arg1
);
9462 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree00
, tree0
);
9468 /* (A << C1) + (A >> C2) if A is unsigned and C1+C2 is the size of A
9469 is a rotate of A by C1 bits. */
9470 /* (A << B) + (A >> (Z - B)) if A is unsigned and Z is the size of A
9471 is a rotate of A by B bits. */
9473 enum tree_code code0
, code1
;
9475 code0
= TREE_CODE (arg0
);
9476 code1
= TREE_CODE (arg1
);
9477 if (((code0
== RSHIFT_EXPR
&& code1
== LSHIFT_EXPR
)
9478 || (code1
== RSHIFT_EXPR
&& code0
== LSHIFT_EXPR
))
9479 && operand_equal_p (TREE_OPERAND (arg0
, 0),
9480 TREE_OPERAND (arg1
, 0), 0)
9481 && (rtype
= TREE_TYPE (TREE_OPERAND (arg0
, 0)),
9482 TYPE_UNSIGNED (rtype
))
9483 /* Only create rotates in complete modes. Other cases are not
9484 expanded properly. */
9485 && (element_precision (rtype
)
9486 == GET_MODE_UNIT_PRECISION (TYPE_MODE (rtype
))))
9488 tree tree01
, tree11
;
9489 enum tree_code code01
, code11
;
9491 tree01
= TREE_OPERAND (arg0
, 1);
9492 tree11
= TREE_OPERAND (arg1
, 1);
9493 STRIP_NOPS (tree01
);
9494 STRIP_NOPS (tree11
);
9495 code01
= TREE_CODE (tree01
);
9496 code11
= TREE_CODE (tree11
);
9497 if (code01
== INTEGER_CST
9498 && code11
== INTEGER_CST
9499 && (wi::to_widest (tree01
) + wi::to_widest (tree11
)
9500 == element_precision (TREE_TYPE (TREE_OPERAND (arg0
, 0)))))
9502 tem
= build2_loc (loc
, LROTATE_EXPR
,
9503 TREE_TYPE (TREE_OPERAND (arg0
, 0)),
9504 TREE_OPERAND (arg0
, 0),
9505 code0
== LSHIFT_EXPR
9506 ? TREE_OPERAND (arg0
, 1)
9507 : TREE_OPERAND (arg1
, 1));
9508 return fold_convert_loc (loc
, type
, tem
);
9510 else if (code11
== MINUS_EXPR
)
9512 tree tree110
, tree111
;
9513 tree110
= TREE_OPERAND (tree11
, 0);
9514 tree111
= TREE_OPERAND (tree11
, 1);
9515 STRIP_NOPS (tree110
);
9516 STRIP_NOPS (tree111
);
9517 if (TREE_CODE (tree110
) == INTEGER_CST
9518 && 0 == compare_tree_int (tree110
,
9520 (TREE_TYPE (TREE_OPERAND
9522 && operand_equal_p (tree01
, tree111
, 0))
9524 fold_convert_loc (loc
, type
,
9525 build2 ((code0
== LSHIFT_EXPR
9528 TREE_TYPE (TREE_OPERAND (arg0
, 0)),
9529 TREE_OPERAND (arg0
, 0),
9530 TREE_OPERAND (arg0
, 1)));
9532 else if (code01
== MINUS_EXPR
)
9534 tree tree010
, tree011
;
9535 tree010
= TREE_OPERAND (tree01
, 0);
9536 tree011
= TREE_OPERAND (tree01
, 1);
9537 STRIP_NOPS (tree010
);
9538 STRIP_NOPS (tree011
);
9539 if (TREE_CODE (tree010
) == INTEGER_CST
9540 && 0 == compare_tree_int (tree010
,
9542 (TREE_TYPE (TREE_OPERAND
9544 && operand_equal_p (tree11
, tree011
, 0))
9545 return fold_convert_loc
9547 build2 ((code0
!= LSHIFT_EXPR
9550 TREE_TYPE (TREE_OPERAND (arg0
, 0)),
9551 TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 1)));
9557 /* In most languages, can't associate operations on floats through
9558 parentheses. Rather than remember where the parentheses were, we
9559 don't associate floats at all, unless the user has specified
9561 And, we need to make sure type is not saturating. */
9563 if ((! FLOAT_TYPE_P (type
) || flag_associative_math
)
9564 && !TYPE_SATURATING (type
))
9566 tree var0
, con0
, lit0
, minus_lit0
;
9567 tree var1
, con1
, lit1
, minus_lit1
;
9571 /* Split both trees into variables, constants, and literals. Then
9572 associate each group together, the constants with literals,
9573 then the result with variables. This increases the chances of
9574 literals being recombined later and of generating relocatable
9575 expressions for the sum of a constant and literal. */
9576 var0
= split_tree (loc
, arg0
, type
, code
,
9577 &con0
, &lit0
, &minus_lit0
, 0);
9578 var1
= split_tree (loc
, arg1
, type
, code
,
9579 &con1
, &lit1
, &minus_lit1
, code
== MINUS_EXPR
);
9581 /* Recombine MINUS_EXPR operands by using PLUS_EXPR. */
9582 if (code
== MINUS_EXPR
)
9585 /* With undefined overflow prefer doing association in a type
9586 which wraps on overflow, if that is one of the operand types. */
9587 if ((POINTER_TYPE_P (type
) && POINTER_TYPE_OVERFLOW_UNDEFINED
)
9588 || (INTEGRAL_TYPE_P (type
) && !TYPE_OVERFLOW_WRAPS (type
)))
9590 if (INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
9591 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
)))
9592 atype
= TREE_TYPE (arg0
);
9593 else if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
9594 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1
)))
9595 atype
= TREE_TYPE (arg1
);
9596 gcc_assert (TYPE_PRECISION (atype
) == TYPE_PRECISION (type
));
9599 /* With undefined overflow we can only associate constants with one
9600 variable, and constants whose association doesn't overflow. */
9601 if ((POINTER_TYPE_P (atype
) && POINTER_TYPE_OVERFLOW_UNDEFINED
)
9602 || (INTEGRAL_TYPE_P (atype
) && !TYPE_OVERFLOW_WRAPS (atype
)))
9608 bool one_neg
= false;
9610 if (TREE_CODE (tmp0
) == NEGATE_EXPR
)
9612 tmp0
= TREE_OPERAND (tmp0
, 0);
9615 if (CONVERT_EXPR_P (tmp0
)
9616 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
9617 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
9618 <= TYPE_PRECISION (atype
)))
9619 tmp0
= TREE_OPERAND (tmp0
, 0);
9620 if (TREE_CODE (tmp1
) == NEGATE_EXPR
)
9622 tmp1
= TREE_OPERAND (tmp1
, 0);
9625 if (CONVERT_EXPR_P (tmp1
)
9626 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
9627 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
9628 <= TYPE_PRECISION (atype
)))
9629 tmp1
= TREE_OPERAND (tmp1
, 0);
9630 /* The only case we can still associate with two variables
9631 is if they cancel out. */
9633 || !operand_equal_p (tmp0
, tmp1
, 0))
9638 /* Only do something if we found more than two objects. Otherwise,
9639 nothing has changed and we risk infinite recursion. */
9641 && (2 < ((var0
!= 0) + (var1
!= 0)
9642 + (con0
!= 0) + (con1
!= 0)
9643 + (lit0
!= 0) + (lit1
!= 0)
9644 + (minus_lit0
!= 0) + (minus_lit1
!= 0))))
9646 bool any_overflows
= false;
9647 if (lit0
) any_overflows
|= TREE_OVERFLOW (lit0
);
9648 if (lit1
) any_overflows
|= TREE_OVERFLOW (lit1
);
9649 if (minus_lit0
) any_overflows
|= TREE_OVERFLOW (minus_lit0
);
9650 if (minus_lit1
) any_overflows
|= TREE_OVERFLOW (minus_lit1
);
9651 var0
= associate_trees (loc
, var0
, var1
, code
, atype
);
9652 con0
= associate_trees (loc
, con0
, con1
, code
, atype
);
9653 lit0
= associate_trees (loc
, lit0
, lit1
, code
, atype
);
9654 minus_lit0
= associate_trees (loc
, minus_lit0
, minus_lit1
,
9657 /* Preserve the MINUS_EXPR if the negative part of the literal is
9658 greater than the positive part. Otherwise, the multiplicative
9659 folding code (i.e extract_muldiv) may be fooled in case
9660 unsigned constants are subtracted, like in the following
9661 example: ((X*2 + 4) - 8U)/2. */
9662 if (minus_lit0
&& lit0
)
9664 if (TREE_CODE (lit0
) == INTEGER_CST
9665 && TREE_CODE (minus_lit0
) == INTEGER_CST
9666 && tree_int_cst_lt (lit0
, minus_lit0
))
9668 minus_lit0
= associate_trees (loc
, minus_lit0
, lit0
,
9674 lit0
= associate_trees (loc
, lit0
, minus_lit0
,
9680 /* Don't introduce overflows through reassociation. */
9682 && ((lit0
&& TREE_OVERFLOW_P (lit0
))
9683 || (minus_lit0
&& TREE_OVERFLOW_P (minus_lit0
))))
9690 fold_convert_loc (loc
, type
,
9691 associate_trees (loc
, var0
, minus_lit0
,
9692 MINUS_EXPR
, atype
));
9695 con0
= associate_trees (loc
, con0
, minus_lit0
,
9698 fold_convert_loc (loc
, type
,
9699 associate_trees (loc
, var0
, con0
,
9704 con0
= associate_trees (loc
, con0
, lit0
, code
, atype
);
9706 fold_convert_loc (loc
, type
, associate_trees (loc
, var0
, con0
,
9714 /* (-A) - B -> (-B) - A where B is easily negated and we can swap. */
9715 if (TREE_CODE (arg0
) == NEGATE_EXPR
9716 && negate_expr_p (op1
))
9717 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
9719 fold_convert_loc (loc
, type
,
9720 TREE_OPERAND (arg0
, 0)));
9722 /* Fold __complex__ ( x, 0 ) - __complex__ ( 0, y ) to
9723 __complex__ ( x, -y ). This is not the same for SNaNs or if
9724 signed zeros are involved. */
9725 if (!HONOR_SNANS (element_mode (arg0
))
9726 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
9727 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
9729 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
9730 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
9731 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
9732 bool arg0rz
= false, arg0iz
= false;
9733 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
9734 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
9736 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
9737 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
9738 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
9740 tree rp
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
9742 : build1 (REALPART_EXPR
, rtype
, arg1
));
9743 tree ip
= arg0i
? arg0i
9744 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
9745 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
9747 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
9749 tree rp
= arg0r
? arg0r
9750 : build1 (REALPART_EXPR
, rtype
, arg0
);
9751 tree ip
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
9753 : build1 (IMAGPART_EXPR
, rtype
, arg1
));
9754 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
9759 /* A - B -> A + (-B) if B is easily negatable. */
9760 if (negate_expr_p (op1
)
9761 && ! TYPE_OVERFLOW_SANITIZED (type
)
9762 && ((FLOAT_TYPE_P (type
)
9763 /* Avoid this transformation if B is a positive REAL_CST. */
9764 && (TREE_CODE (op1
) != REAL_CST
9765 || REAL_VALUE_NEGATIVE (TREE_REAL_CST (op1
))))
9766 || INTEGRAL_TYPE_P (type
)))
9767 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
9768 fold_convert_loc (loc
, type
, arg0
),
9771 /* Fold &a[i] - &a[j] to i-j. */
9772 if (TREE_CODE (arg0
) == ADDR_EXPR
9773 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == ARRAY_REF
9774 && TREE_CODE (arg1
) == ADDR_EXPR
9775 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == ARRAY_REF
)
9777 tree tem
= fold_addr_of_array_ref_difference (loc
, type
,
9778 TREE_OPERAND (arg0
, 0),
9779 TREE_OPERAND (arg1
, 0));
9784 if (FLOAT_TYPE_P (type
)
9785 && flag_unsafe_math_optimizations
9786 && (TREE_CODE (arg0
) == RDIV_EXPR
|| TREE_CODE (arg0
) == MULT_EXPR
)
9787 && (TREE_CODE (arg1
) == RDIV_EXPR
|| TREE_CODE (arg1
) == MULT_EXPR
)
9788 && (tem
= distribute_real_division (loc
, code
, type
, arg0
, arg1
)))
9791 /* Handle (A1 * C1) - (A2 * C2) with A1, A2 or C1, C2 being the same or
9792 one. Make sure the type is not saturating and has the signedness of
9793 the stripped operands, as fold_plusminus_mult_expr will re-associate.
9794 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
9795 if ((TREE_CODE (arg0
) == MULT_EXPR
9796 || TREE_CODE (arg1
) == MULT_EXPR
)
9797 && !TYPE_SATURATING (type
)
9798 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
9799 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
9800 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
9802 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
9810 if (! FLOAT_TYPE_P (type
))
9812 /* Transform x * -C into -x * C if x is easily negatable. */
9813 if (TREE_CODE (op1
) == INTEGER_CST
9814 && tree_int_cst_sgn (op1
) == -1
9815 && negate_expr_p (op0
)
9816 && (tem
= negate_expr (op1
)) != op1
9817 && ! TREE_OVERFLOW (tem
))
9818 return fold_build2_loc (loc
, MULT_EXPR
, type
,
9819 fold_convert_loc (loc
, type
,
9820 negate_expr (op0
)), tem
);
9822 strict_overflow_p
= false;
9823 if (TREE_CODE (arg1
) == INTEGER_CST
9824 && 0 != (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
9825 &strict_overflow_p
)))
9827 if (strict_overflow_p
)
9828 fold_overflow_warning (("assuming signed overflow does not "
9829 "occur when simplifying "
9831 WARN_STRICT_OVERFLOW_MISC
);
9832 return fold_convert_loc (loc
, type
, tem
);
9835 /* Optimize z * conj(z) for integer complex numbers. */
9836 if (TREE_CODE (arg0
) == CONJ_EXPR
9837 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
9838 return fold_mult_zconjz (loc
, type
, arg1
);
9839 if (TREE_CODE (arg1
) == CONJ_EXPR
9840 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
9841 return fold_mult_zconjz (loc
, type
, arg0
);
9845 /* Fold z * +-I to __complex__ (-+__imag z, +-__real z).
9846 This is not the same for NaNs or if signed zeros are
9848 if (!HONOR_NANS (arg0
)
9849 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
9850 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
))
9851 && TREE_CODE (arg1
) == COMPLEX_CST
9852 && real_zerop (TREE_REALPART (arg1
)))
9854 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
9855 if (real_onep (TREE_IMAGPART (arg1
)))
9857 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
9858 negate_expr (fold_build1_loc (loc
, IMAGPART_EXPR
,
9860 fold_build1_loc (loc
, REALPART_EXPR
, rtype
, arg0
));
9861 else if (real_minus_onep (TREE_IMAGPART (arg1
)))
9863 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
9864 fold_build1_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
),
9865 negate_expr (fold_build1_loc (loc
, REALPART_EXPR
,
9869 /* Optimize z * conj(z) for floating point complex numbers.
9870 Guarded by flag_unsafe_math_optimizations as non-finite
9871 imaginary components don't produce scalar results. */
9872 if (flag_unsafe_math_optimizations
9873 && TREE_CODE (arg0
) == CONJ_EXPR
9874 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
9875 return fold_mult_zconjz (loc
, type
, arg1
);
9876 if (flag_unsafe_math_optimizations
9877 && TREE_CODE (arg1
) == CONJ_EXPR
9878 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
9879 return fold_mult_zconjz (loc
, type
, arg0
);
9884 /* Canonicalize (X & C1) | C2. */
9885 if (TREE_CODE (arg0
) == BIT_AND_EXPR
9886 && TREE_CODE (arg1
) == INTEGER_CST
9887 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
9889 int width
= TYPE_PRECISION (type
), w
;
9890 wide_int c1
= TREE_OPERAND (arg0
, 1);
9893 /* If (C1&C2) == C1, then (X&C1)|C2 becomes (X,C2). */
9894 if ((c1
& c2
) == c1
)
9895 return omit_one_operand_loc (loc
, type
, arg1
,
9896 TREE_OPERAND (arg0
, 0));
9898 wide_int msk
= wi::mask (width
, false,
9899 TYPE_PRECISION (TREE_TYPE (arg1
)));
9901 /* If (C1|C2) == ~0 then (X&C1)|C2 becomes X|C2. */
9902 if (msk
.and_not (c1
| c2
) == 0)
9904 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
9905 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
, tem
, arg1
);
9908 /* Minimize the number of bits set in C1, i.e. C1 := C1 & ~C2,
9909 unless (C1 & ~C2) | (C2 & C3) for some C3 is a mask of some
9910 mode which allows further optimizations. */
9913 wide_int c3
= c1
.and_not (c2
);
9914 for (w
= BITS_PER_UNIT
; w
<= width
; w
<<= 1)
9916 wide_int mask
= wi::mask (w
, false,
9917 TYPE_PRECISION (type
));
9918 if (((c1
| c2
) & mask
) == mask
&& c1
.and_not (mask
) == 0)
9927 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
9928 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, type
, tem
,
9929 wide_int_to_tree (type
, c3
));
9930 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
, tem
, arg1
);
9934 /* See if this can be simplified into a rotate first. If that
9935 is unsuccessful continue in the association code. */
9939 /* Fold (X & 1) ^ 1 as (X & 1) == 0. */
9940 if (TREE_CODE (arg0
) == BIT_AND_EXPR
9941 && INTEGRAL_TYPE_P (type
)
9942 && integer_onep (TREE_OPERAND (arg0
, 1))
9943 && integer_onep (arg1
))
9944 return fold_build2_loc (loc
, EQ_EXPR
, type
, arg0
,
9945 build_zero_cst (TREE_TYPE (arg0
)));
9947 /* See if this can be simplified into a rotate first. If that
9948 is unsuccessful continue in the association code. */
9952 /* Fold (X ^ 1) & 1 as (X & 1) == 0. */
9953 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
9954 && INTEGRAL_TYPE_P (type
)
9955 && integer_onep (TREE_OPERAND (arg0
, 1))
9956 && integer_onep (arg1
))
9959 tem
= TREE_OPERAND (arg0
, 0);
9960 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
9961 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
9963 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
9964 build_zero_cst (TREE_TYPE (tem
)));
9966 /* Fold ~X & 1 as (X & 1) == 0. */
9967 if (TREE_CODE (arg0
) == BIT_NOT_EXPR
9968 && INTEGRAL_TYPE_P (type
)
9969 && integer_onep (arg1
))
9972 tem
= TREE_OPERAND (arg0
, 0);
9973 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
9974 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
9976 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
9977 build_zero_cst (TREE_TYPE (tem
)));
9979 /* Fold !X & 1 as X == 0. */
9980 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
9981 && integer_onep (arg1
))
9983 tem
= TREE_OPERAND (arg0
, 0);
9984 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem
,
9985 build_zero_cst (TREE_TYPE (tem
)));
9988 /* Fold (X * Y) & -(1 << CST) to X * Y if Y is a constant
9989 multiple of 1 << CST. */
9990 if (TREE_CODE (arg1
) == INTEGER_CST
)
9992 wide_int cst1
= arg1
;
9993 wide_int ncst1
= -cst1
;
9994 if ((cst1
& ncst1
) == ncst1
9995 && multiple_of_p (type
, arg0
,
9996 wide_int_to_tree (TREE_TYPE (arg1
), ncst1
)))
9997 return fold_convert_loc (loc
, type
, arg0
);
10000 /* Fold (X * CST1) & CST2 to zero if we can, or drop known zero
10002 if (TREE_CODE (arg1
) == INTEGER_CST
10003 && TREE_CODE (arg0
) == MULT_EXPR
10004 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
10006 wide_int warg1
= arg1
;
10007 wide_int masked
= mask_with_tz (type
, warg1
, TREE_OPERAND (arg0
, 1));
10010 return omit_two_operands_loc (loc
, type
, build_zero_cst (type
),
10012 else if (masked
!= warg1
)
10014 /* Avoid the transform if arg1 is a mask of some
10015 mode which allows further optimizations. */
10016 int pop
= wi::popcount (warg1
);
10017 if (!(pop
>= BITS_PER_UNIT
10019 && wi::mask (pop
, false, warg1
.get_precision ()) == warg1
))
10020 return fold_build2_loc (loc
, code
, type
, op0
,
10021 wide_int_to_tree (type
, masked
));
10025 /* For constants M and N, if M == (1LL << cst) - 1 && (N & M) == M,
10026 ((A & N) + B) & M -> (A + B) & M
10027 Similarly if (N & M) == 0,
10028 ((A | N) + B) & M -> (A + B) & M
10029 and for - instead of + (or unary - instead of +)
10030 and/or ^ instead of |.
10031 If B is constant and (B & M) == 0, fold into A & M. */
10032 if (TREE_CODE (arg1
) == INTEGER_CST
)
10034 wide_int cst1
= arg1
;
10035 if ((~cst1
!= 0) && (cst1
& (cst1
+ 1)) == 0
10036 && INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10037 && (TREE_CODE (arg0
) == PLUS_EXPR
10038 || TREE_CODE (arg0
) == MINUS_EXPR
10039 || TREE_CODE (arg0
) == NEGATE_EXPR
)
10040 && (TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
))
10041 || TREE_CODE (TREE_TYPE (arg0
)) == INTEGER_TYPE
))
10047 /* Now we know that arg0 is (C + D) or (C - D) or
10048 -C and arg1 (M) is == (1LL << cst) - 1.
10049 Store C into PMOP[0] and D into PMOP[1]. */
10050 pmop
[0] = TREE_OPERAND (arg0
, 0);
10052 if (TREE_CODE (arg0
) != NEGATE_EXPR
)
10054 pmop
[1] = TREE_OPERAND (arg0
, 1);
10058 if ((wi::max_value (TREE_TYPE (arg0
)) & cst1
) != cst1
)
10061 for (; which
>= 0; which
--)
10062 switch (TREE_CODE (pmop
[which
]))
10067 if (TREE_CODE (TREE_OPERAND (pmop
[which
], 1))
10070 cst0
= TREE_OPERAND (pmop
[which
], 1);
10072 if (TREE_CODE (pmop
[which
]) == BIT_AND_EXPR
)
10077 else if (cst0
!= 0)
10079 /* If C or D is of the form (A & N) where
10080 (N & M) == M, or of the form (A | N) or
10081 (A ^ N) where (N & M) == 0, replace it with A. */
10082 pmop
[which
] = TREE_OPERAND (pmop
[which
], 0);
10085 /* If C or D is a N where (N & M) == 0, it can be
10086 omitted (assumed 0). */
10087 if ((TREE_CODE (arg0
) == PLUS_EXPR
10088 || (TREE_CODE (arg0
) == MINUS_EXPR
&& which
== 0))
10089 && (cst1
& pmop
[which
]) == 0)
10090 pmop
[which
] = NULL
;
10096 /* Only build anything new if we optimized one or both arguments
10098 if (pmop
[0] != TREE_OPERAND (arg0
, 0)
10099 || (TREE_CODE (arg0
) != NEGATE_EXPR
10100 && pmop
[1] != TREE_OPERAND (arg0
, 1)))
10102 tree utype
= TREE_TYPE (arg0
);
10103 if (! TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
)))
10105 /* Perform the operations in a type that has defined
10106 overflow behavior. */
10107 utype
= unsigned_type_for (TREE_TYPE (arg0
));
10108 if (pmop
[0] != NULL
)
10109 pmop
[0] = fold_convert_loc (loc
, utype
, pmop
[0]);
10110 if (pmop
[1] != NULL
)
10111 pmop
[1] = fold_convert_loc (loc
, utype
, pmop
[1]);
10114 if (TREE_CODE (arg0
) == NEGATE_EXPR
)
10115 tem
= fold_build1_loc (loc
, NEGATE_EXPR
, utype
, pmop
[0]);
10116 else if (TREE_CODE (arg0
) == PLUS_EXPR
)
10118 if (pmop
[0] != NULL
&& pmop
[1] != NULL
)
10119 tem
= fold_build2_loc (loc
, PLUS_EXPR
, utype
,
10121 else if (pmop
[0] != NULL
)
10123 else if (pmop
[1] != NULL
)
10126 return build_int_cst (type
, 0);
10128 else if (pmop
[0] == NULL
)
10129 tem
= fold_build1_loc (loc
, NEGATE_EXPR
, utype
, pmop
[1]);
10131 tem
= fold_build2_loc (loc
, MINUS_EXPR
, utype
,
10133 /* TEM is now the new binary +, - or unary - replacement. */
10134 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, utype
, tem
,
10135 fold_convert_loc (loc
, utype
, arg1
));
10136 return fold_convert_loc (loc
, type
, tem
);
10141 /* Simplify ((int)c & 0377) into (int)c, if c is unsigned char. */
10142 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) == NOP_EXPR
10143 && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg0
, 0))))
10145 prec
= element_precision (TREE_TYPE (TREE_OPERAND (arg0
, 0)));
10147 wide_int mask
= wide_int::from (arg1
, prec
, UNSIGNED
);
10150 fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10156 /* Don't touch a floating-point divide by zero unless the mode
10157 of the constant can represent infinity. */
10158 if (TREE_CODE (arg1
) == REAL_CST
10159 && !MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (arg1
)))
10160 && real_zerop (arg1
))
10163 /* (-A) / (-B) -> A / B */
10164 if (TREE_CODE (arg0
) == NEGATE_EXPR
&& negate_expr_p (arg1
))
10165 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
10166 TREE_OPERAND (arg0
, 0),
10167 negate_expr (arg1
));
10168 if (TREE_CODE (arg1
) == NEGATE_EXPR
&& negate_expr_p (arg0
))
10169 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
10170 negate_expr (arg0
),
10171 TREE_OPERAND (arg1
, 0));
10174 case TRUNC_DIV_EXPR
:
10177 case FLOOR_DIV_EXPR
:
10178 /* Simplify A / (B << N) where A and B are positive and B is
10179 a power of 2, to A >> (N + log2(B)). */
10180 strict_overflow_p
= false;
10181 if (TREE_CODE (arg1
) == LSHIFT_EXPR
10182 && (TYPE_UNSIGNED (type
)
10183 || tree_expr_nonnegative_warnv_p (op0
, &strict_overflow_p
)))
10185 tree sval
= TREE_OPERAND (arg1
, 0);
10186 if (integer_pow2p (sval
) && tree_int_cst_sgn (sval
) > 0)
10188 tree sh_cnt
= TREE_OPERAND (arg1
, 1);
10189 tree pow2
= build_int_cst (TREE_TYPE (sh_cnt
),
10190 wi::exact_log2 (sval
));
10192 if (strict_overflow_p
)
10193 fold_overflow_warning (("assuming signed overflow does not "
10194 "occur when simplifying A / (B << N)"),
10195 WARN_STRICT_OVERFLOW_MISC
);
10197 sh_cnt
= fold_build2_loc (loc
, PLUS_EXPR
, TREE_TYPE (sh_cnt
),
10199 return fold_build2_loc (loc
, RSHIFT_EXPR
, type
,
10200 fold_convert_loc (loc
, type
, arg0
), sh_cnt
);
10206 case ROUND_DIV_EXPR
:
10207 case CEIL_DIV_EXPR
:
10208 case EXACT_DIV_EXPR
:
10209 if (integer_zerop (arg1
))
10212 /* Convert -A / -B to A / B when the type is signed and overflow is
10214 if ((!INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
10215 && TREE_CODE (op0
) == NEGATE_EXPR
10216 && negate_expr_p (op1
))
10218 if (INTEGRAL_TYPE_P (type
))
10219 fold_overflow_warning (("assuming signed overflow does not occur "
10220 "when distributing negation across "
10222 WARN_STRICT_OVERFLOW_MISC
);
10223 return fold_build2_loc (loc
, code
, type
,
10224 fold_convert_loc (loc
, type
,
10225 TREE_OPERAND (arg0
, 0)),
10226 negate_expr (op1
));
10228 if ((!INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
10229 && TREE_CODE (arg1
) == NEGATE_EXPR
10230 && negate_expr_p (op0
))
10232 if (INTEGRAL_TYPE_P (type
))
10233 fold_overflow_warning (("assuming signed overflow does not occur "
10234 "when distributing negation across "
10236 WARN_STRICT_OVERFLOW_MISC
);
10237 return fold_build2_loc (loc
, code
, type
,
10239 fold_convert_loc (loc
, type
,
10240 TREE_OPERAND (arg1
, 0)));
10243 /* If arg0 is a multiple of arg1, then rewrite to the fastest div
10244 operation, EXACT_DIV_EXPR.
10246 Note that only CEIL_DIV_EXPR and FLOOR_DIV_EXPR are rewritten now.
10247 At one time others generated faster code, it's not clear if they do
10248 after the last round to changes to the DIV code in expmed.c. */
10249 if ((code
== CEIL_DIV_EXPR
|| code
== FLOOR_DIV_EXPR
)
10250 && multiple_of_p (type
, arg0
, arg1
))
10251 return fold_build2_loc (loc
, EXACT_DIV_EXPR
, type
,
10252 fold_convert (type
, arg0
),
10253 fold_convert (type
, arg1
));
10255 strict_overflow_p
= false;
10256 if (TREE_CODE (arg1
) == INTEGER_CST
10257 && 0 != (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
10258 &strict_overflow_p
)))
10260 if (strict_overflow_p
)
10261 fold_overflow_warning (("assuming signed overflow does not occur "
10262 "when simplifying division"),
10263 WARN_STRICT_OVERFLOW_MISC
);
10264 return fold_convert_loc (loc
, type
, tem
);
10269 case CEIL_MOD_EXPR
:
10270 case FLOOR_MOD_EXPR
:
10271 case ROUND_MOD_EXPR
:
10272 case TRUNC_MOD_EXPR
:
10273 strict_overflow_p
= false;
10274 if (TREE_CODE (arg1
) == INTEGER_CST
10275 && 0 != (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
10276 &strict_overflow_p
)))
10278 if (strict_overflow_p
)
10279 fold_overflow_warning (("assuming signed overflow does not occur "
10280 "when simplifying modulus"),
10281 WARN_STRICT_OVERFLOW_MISC
);
10282 return fold_convert_loc (loc
, type
, tem
);
10291 /* Since negative shift count is not well-defined,
10292 don't try to compute it in the compiler. */
10293 if (TREE_CODE (arg1
) == INTEGER_CST
&& tree_int_cst_sgn (arg1
) < 0)
10296 prec
= element_precision (type
);
10298 /* If we have a rotate of a bit operation with the rotate count and
10299 the second operand of the bit operation both constant,
10300 permute the two operations. */
10301 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
10302 && (TREE_CODE (arg0
) == BIT_AND_EXPR
10303 || TREE_CODE (arg0
) == BIT_IOR_EXPR
10304 || TREE_CODE (arg0
) == BIT_XOR_EXPR
)
10305 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
10307 tree arg00
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10308 tree arg01
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
10309 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
10310 fold_build2_loc (loc
, code
, type
,
10312 fold_build2_loc (loc
, code
, type
,
10316 /* Two consecutive rotates adding up to the some integer
10317 multiple of the precision of the type can be ignored. */
10318 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
10319 && TREE_CODE (arg0
) == RROTATE_EXPR
10320 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
10321 && wi::umod_trunc (wi::add (arg1
, TREE_OPERAND (arg0
, 1)),
10323 return fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10331 case TRUTH_ANDIF_EXPR
:
10332 /* Note that the operands of this must be ints
10333 and their values must be 0 or 1.
10334 ("true" is a fixed value perhaps depending on the language.) */
10335 /* If first arg is constant zero, return it. */
10336 if (integer_zerop (arg0
))
10337 return fold_convert_loc (loc
, type
, arg0
);
10339 case TRUTH_AND_EXPR
:
10340 /* If either arg is constant true, drop it. */
10341 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
10342 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
10343 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
)
10344 /* Preserve sequence points. */
10345 && (code
!= TRUTH_ANDIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
10346 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
10347 /* If second arg is constant zero, result is zero, but first arg
10348 must be evaluated. */
10349 if (integer_zerop (arg1
))
10350 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
10351 /* Likewise for first arg, but note that only the TRUTH_AND_EXPR
10352 case will be handled here. */
10353 if (integer_zerop (arg0
))
10354 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
10356 /* !X && X is always false. */
10357 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
10358 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10359 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg1
);
10360 /* X && !X is always false. */
10361 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
10362 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10363 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
10365 /* A < X && A + 1 > Y ==> A < X && A >= Y. Normally A + 1 > Y
10366 means A >= Y && A != MAX, but in this case we know that
10369 if (!TREE_SIDE_EFFECTS (arg0
)
10370 && !TREE_SIDE_EFFECTS (arg1
))
10372 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg0
, arg1
);
10373 if (tem
&& !operand_equal_p (tem
, arg0
, 0))
10374 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
10376 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg1
, arg0
);
10377 if (tem
&& !operand_equal_p (tem
, arg1
, 0))
10378 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
10381 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
10387 case TRUTH_ORIF_EXPR
:
10388 /* Note that the operands of this must be ints
10389 and their values must be 0 or true.
10390 ("true" is a fixed value perhaps depending on the language.) */
10391 /* If first arg is constant true, return it. */
10392 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
10393 return fold_convert_loc (loc
, type
, arg0
);
10395 case TRUTH_OR_EXPR
:
10396 /* If either arg is constant zero, drop it. */
10397 if (TREE_CODE (arg0
) == INTEGER_CST
&& integer_zerop (arg0
))
10398 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
10399 if (TREE_CODE (arg1
) == INTEGER_CST
&& integer_zerop (arg1
)
10400 /* Preserve sequence points. */
10401 && (code
!= TRUTH_ORIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
10402 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
10403 /* If second arg is constant true, result is true, but we must
10404 evaluate first arg. */
10405 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
))
10406 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
10407 /* Likewise for first arg, but note this only occurs here for
10409 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
10410 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
10412 /* !X || X is always true. */
10413 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
10414 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10415 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
10416 /* X || !X is always true. */
10417 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
10418 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10419 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
10421 /* (X && !Y) || (!X && Y) is X ^ Y */
10422 if (TREE_CODE (arg0
) == TRUTH_AND_EXPR
10423 && TREE_CODE (arg1
) == TRUTH_AND_EXPR
)
10425 tree a0
, a1
, l0
, l1
, n0
, n1
;
10427 a0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 0));
10428 a1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 1));
10430 l0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10431 l1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
10433 n0
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l0
);
10434 n1
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l1
);
10436 if ((operand_equal_p (n0
, a0
, 0)
10437 && operand_equal_p (n1
, a1
, 0))
10438 || (operand_equal_p (n0
, a1
, 0)
10439 && operand_equal_p (n1
, a0
, 0)))
10440 return fold_build2_loc (loc
, TRUTH_XOR_EXPR
, type
, l0
, n1
);
10443 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
10449 case TRUTH_XOR_EXPR
:
10450 /* If the second arg is constant zero, drop it. */
10451 if (integer_zerop (arg1
))
10452 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
10453 /* If the second arg is constant true, this is a logical inversion. */
10454 if (integer_onep (arg1
))
10456 tem
= invert_truthvalue_loc (loc
, arg0
);
10457 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, tem
));
10459 /* Identical arguments cancel to zero. */
10460 if (operand_equal_p (arg0
, arg1
, 0))
10461 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
10463 /* !X ^ X is always true. */
10464 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
10465 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10466 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
10468 /* X ^ !X is always true. */
10469 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
10470 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10471 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
10480 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
10481 if (tem
!= NULL_TREE
)
10484 /* bool_var != 1 becomes !bool_var. */
10485 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_onep (arg1
)
10486 && code
== NE_EXPR
)
10487 return fold_convert_loc (loc
, type
,
10488 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
10489 TREE_TYPE (arg0
), arg0
));
10491 /* bool_var == 0 becomes !bool_var. */
10492 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_zerop (arg1
)
10493 && code
== EQ_EXPR
)
10494 return fold_convert_loc (loc
, type
,
10495 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
10496 TREE_TYPE (arg0
), arg0
));
10498 /* !exp != 0 becomes !exp */
10499 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
&& integer_zerop (arg1
)
10500 && code
== NE_EXPR
)
10501 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
10503 /* Transform comparisons of the form X +- Y CMP X to Y CMP 0. */
10504 if ((TREE_CODE (arg0
) == PLUS_EXPR
10505 || TREE_CODE (arg0
) == POINTER_PLUS_EXPR
10506 || TREE_CODE (arg0
) == MINUS_EXPR
)
10507 && operand_equal_p (tree_strip_nop_conversions (TREE_OPERAND (arg0
,
10510 && (INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10511 || POINTER_TYPE_P (TREE_TYPE (arg0
))))
10513 tree val
= TREE_OPERAND (arg0
, 1);
10514 val
= fold_build2_loc (loc
, code
, type
, val
,
10515 build_int_cst (TREE_TYPE (val
), 0));
10516 return omit_two_operands_loc (loc
, type
, val
,
10517 TREE_OPERAND (arg0
, 0), arg1
);
10520 /* Transform comparisons of the form X CMP X +- Y to Y CMP 0. */
10521 if ((TREE_CODE (arg1
) == PLUS_EXPR
10522 || TREE_CODE (arg1
) == POINTER_PLUS_EXPR
10523 || TREE_CODE (arg1
) == MINUS_EXPR
)
10524 && operand_equal_p (tree_strip_nop_conversions (TREE_OPERAND (arg1
,
10527 && (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
10528 || POINTER_TYPE_P (TREE_TYPE (arg1
))))
10530 tree val
= TREE_OPERAND (arg1
, 1);
10531 val
= fold_build2_loc (loc
, code
, type
, val
,
10532 build_int_cst (TREE_TYPE (val
), 0));
10533 return omit_two_operands_loc (loc
, type
, val
,
10534 TREE_OPERAND (arg1
, 0), arg0
);
10537 /* If this is an EQ or NE comparison with zero and ARG0 is
10538 (1 << foo) & bar, convert it to (bar >> foo) & 1. Both require
10539 two operations, but the latter can be done in one less insn
10540 on machines that have only two-operand insns or on which a
10541 constant cannot be the first operand. */
10542 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10543 && integer_zerop (arg1
))
10545 tree arg00
= TREE_OPERAND (arg0
, 0);
10546 tree arg01
= TREE_OPERAND (arg0
, 1);
10547 if (TREE_CODE (arg00
) == LSHIFT_EXPR
10548 && integer_onep (TREE_OPERAND (arg00
, 0)))
10550 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg00
),
10551 arg01
, TREE_OPERAND (arg00
, 1));
10552 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
10553 build_int_cst (TREE_TYPE (arg0
), 1));
10554 return fold_build2_loc (loc
, code
, type
,
10555 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
10558 else if (TREE_CODE (arg01
) == LSHIFT_EXPR
10559 && integer_onep (TREE_OPERAND (arg01
, 0)))
10561 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg01
),
10562 arg00
, TREE_OPERAND (arg01
, 1));
10563 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
10564 build_int_cst (TREE_TYPE (arg0
), 1));
10565 return fold_build2_loc (loc
, code
, type
,
10566 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
10571 /* If this is an NE or EQ comparison of zero against the result of a
10572 signed MOD operation whose second operand is a power of 2, make
10573 the MOD operation unsigned since it is simpler and equivalent. */
10574 if (integer_zerop (arg1
)
10575 && !TYPE_UNSIGNED (TREE_TYPE (arg0
))
10576 && (TREE_CODE (arg0
) == TRUNC_MOD_EXPR
10577 || TREE_CODE (arg0
) == CEIL_MOD_EXPR
10578 || TREE_CODE (arg0
) == FLOOR_MOD_EXPR
10579 || TREE_CODE (arg0
) == ROUND_MOD_EXPR
)
10580 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
10582 tree newtype
= unsigned_type_for (TREE_TYPE (arg0
));
10583 tree newmod
= fold_build2_loc (loc
, TREE_CODE (arg0
), newtype
,
10584 fold_convert_loc (loc
, newtype
,
10585 TREE_OPERAND (arg0
, 0)),
10586 fold_convert_loc (loc
, newtype
,
10587 TREE_OPERAND (arg0
, 1)));
10589 return fold_build2_loc (loc
, code
, type
, newmod
,
10590 fold_convert_loc (loc
, newtype
, arg1
));
10593 /* Fold ((X >> C1) & C2) == 0 and ((X >> C1) & C2) != 0 where
10594 C1 is a valid shift constant, and C2 is a power of two, i.e.
10596 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10597 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == RSHIFT_EXPR
10598 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1))
10600 && integer_pow2p (TREE_OPERAND (arg0
, 1))
10601 && integer_zerop (arg1
))
10603 tree itype
= TREE_TYPE (arg0
);
10604 tree arg001
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1);
10605 prec
= TYPE_PRECISION (itype
);
10607 /* Check for a valid shift count. */
10608 if (wi::ltu_p (arg001
, prec
))
10610 tree arg01
= TREE_OPERAND (arg0
, 1);
10611 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
10612 unsigned HOST_WIDE_INT log2
= tree_log2 (arg01
);
10613 /* If (C2 << C1) doesn't overflow, then ((X >> C1) & C2) != 0
10614 can be rewritten as (X & (C2 << C1)) != 0. */
10615 if ((log2
+ TREE_INT_CST_LOW (arg001
)) < prec
)
10617 tem
= fold_build2_loc (loc
, LSHIFT_EXPR
, itype
, arg01
, arg001
);
10618 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, arg000
, tem
);
10619 return fold_build2_loc (loc
, code
, type
, tem
,
10620 fold_convert_loc (loc
, itype
, arg1
));
10622 /* Otherwise, for signed (arithmetic) shifts,
10623 ((X >> C1) & C2) != 0 is rewritten as X < 0, and
10624 ((X >> C1) & C2) == 0 is rewritten as X >= 0. */
10625 else if (!TYPE_UNSIGNED (itype
))
10626 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
, type
,
10627 arg000
, build_int_cst (itype
, 0));
10628 /* Otherwise, of unsigned (logical) shifts,
10629 ((X >> C1) & C2) != 0 is rewritten as (X,false), and
10630 ((X >> C1) & C2) == 0 is rewritten as (X,true). */
10632 return omit_one_operand_loc (loc
, type
,
10633 code
== EQ_EXPR
? integer_one_node
10634 : integer_zero_node
,
10639 /* If this is a comparison of a field, we may be able to simplify it. */
10640 if ((TREE_CODE (arg0
) == COMPONENT_REF
10641 || TREE_CODE (arg0
) == BIT_FIELD_REF
)
10642 /* Handle the constant case even without -O
10643 to make sure the warnings are given. */
10644 && (optimize
|| TREE_CODE (arg1
) == INTEGER_CST
))
10646 t1
= optimize_bit_field_compare (loc
, code
, type
, arg0
, arg1
);
10651 /* Optimize comparisons of strlen vs zero to a compare of the
10652 first character of the string vs zero. To wit,
10653 strlen(ptr) == 0 => *ptr == 0
10654 strlen(ptr) != 0 => *ptr != 0
10655 Other cases should reduce to one of these two (or a constant)
10656 due to the return value of strlen being unsigned. */
10657 if (TREE_CODE (arg0
) == CALL_EXPR
10658 && integer_zerop (arg1
))
10660 tree fndecl
= get_callee_fndecl (arg0
);
10663 && DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
10664 && DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_STRLEN
10665 && call_expr_nargs (arg0
) == 1
10666 && TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (arg0
, 0))) == POINTER_TYPE
)
10668 tree iref
= build_fold_indirect_ref_loc (loc
,
10669 CALL_EXPR_ARG (arg0
, 0));
10670 return fold_build2_loc (loc
, code
, type
, iref
,
10671 build_int_cst (TREE_TYPE (iref
), 0));
10675 /* Fold (X >> C) != 0 into X < 0 if C is one less than the width
10676 of X. Similarly fold (X >> C) == 0 into X >= 0. */
10677 if (TREE_CODE (arg0
) == RSHIFT_EXPR
10678 && integer_zerop (arg1
)
10679 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
10681 tree arg00
= TREE_OPERAND (arg0
, 0);
10682 tree arg01
= TREE_OPERAND (arg0
, 1);
10683 tree itype
= TREE_TYPE (arg00
);
10684 if (wi::eq_p (arg01
, element_precision (itype
) - 1))
10686 if (TYPE_UNSIGNED (itype
))
10688 itype
= signed_type_for (itype
);
10689 arg00
= fold_convert_loc (loc
, itype
, arg00
);
10691 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
10692 type
, arg00
, build_zero_cst (itype
));
10696 /* Fold (~X & C) == 0 into (X & C) != 0 and (~X & C) != 0 into
10697 (X & C) == 0 when C is a single bit. */
10698 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10699 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_NOT_EXPR
10700 && integer_zerop (arg1
)
10701 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
10703 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
),
10704 TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0),
10705 TREE_OPERAND (arg0
, 1));
10706 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
,
10708 fold_convert_loc (loc
, TREE_TYPE (arg0
),
10712 /* Fold ((X & C) ^ C) eq/ne 0 into (X & C) ne/eq 0, when the
10713 constant C is a power of two, i.e. a single bit. */
10714 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
10715 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
10716 && integer_zerop (arg1
)
10717 && integer_pow2p (TREE_OPERAND (arg0
, 1))
10718 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
10719 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
10721 tree arg00
= TREE_OPERAND (arg0
, 0);
10722 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
10723 arg00
, build_int_cst (TREE_TYPE (arg00
), 0));
10726 /* Likewise, fold ((X ^ C) & C) eq/ne 0 into (X & C) ne/eq 0,
10727 when is C is a power of two, i.e. a single bit. */
10728 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10729 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_XOR_EXPR
10730 && integer_zerop (arg1
)
10731 && integer_pow2p (TREE_OPERAND (arg0
, 1))
10732 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
10733 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
10735 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
10736 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg000
),
10737 arg000
, TREE_OPERAND (arg0
, 1));
10738 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
10739 tem
, build_int_cst (TREE_TYPE (tem
), 0));
10742 if (integer_zerop (arg1
)
10743 && tree_expr_nonzero_p (arg0
))
10745 tree res
= constant_boolean_node (code
==NE_EXPR
, type
);
10746 return omit_one_operand_loc (loc
, type
, res
, arg0
);
10749 /* Fold (X & C) op (Y & C) as (X ^ Y) & C op 0", and symmetries. */
10750 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10751 && TREE_CODE (arg1
) == BIT_AND_EXPR
)
10753 tree arg00
= TREE_OPERAND (arg0
, 0);
10754 tree arg01
= TREE_OPERAND (arg0
, 1);
10755 tree arg10
= TREE_OPERAND (arg1
, 0);
10756 tree arg11
= TREE_OPERAND (arg1
, 1);
10757 tree itype
= TREE_TYPE (arg0
);
10759 if (operand_equal_p (arg01
, arg11
, 0))
10761 tem
= fold_convert_loc (loc
, itype
, arg10
);
10762 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
10763 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg01
);
10764 return fold_build2_loc (loc
, code
, type
, tem
,
10765 build_zero_cst (itype
));
10767 if (operand_equal_p (arg01
, arg10
, 0))
10769 tem
= fold_convert_loc (loc
, itype
, arg11
);
10770 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
10771 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg01
);
10772 return fold_build2_loc (loc
, code
, type
, tem
,
10773 build_zero_cst (itype
));
10775 if (operand_equal_p (arg00
, arg11
, 0))
10777 tem
= fold_convert_loc (loc
, itype
, arg10
);
10778 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
, tem
);
10779 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg00
);
10780 return fold_build2_loc (loc
, code
, type
, tem
,
10781 build_zero_cst (itype
));
10783 if (operand_equal_p (arg00
, arg10
, 0))
10785 tem
= fold_convert_loc (loc
, itype
, arg11
);
10786 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
, tem
);
10787 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg00
);
10788 return fold_build2_loc (loc
, code
, type
, tem
,
10789 build_zero_cst (itype
));
10793 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
10794 && TREE_CODE (arg1
) == BIT_XOR_EXPR
)
10796 tree arg00
= TREE_OPERAND (arg0
, 0);
10797 tree arg01
= TREE_OPERAND (arg0
, 1);
10798 tree arg10
= TREE_OPERAND (arg1
, 0);
10799 tree arg11
= TREE_OPERAND (arg1
, 1);
10800 tree itype
= TREE_TYPE (arg0
);
10802 /* Optimize (X ^ Z) op (Y ^ Z) as X op Y, and symmetries.
10803 operand_equal_p guarantees no side-effects so we don't need
10804 to use omit_one_operand on Z. */
10805 if (operand_equal_p (arg01
, arg11
, 0))
10806 return fold_build2_loc (loc
, code
, type
, arg00
,
10807 fold_convert_loc (loc
, TREE_TYPE (arg00
),
10809 if (operand_equal_p (arg01
, arg10
, 0))
10810 return fold_build2_loc (loc
, code
, type
, arg00
,
10811 fold_convert_loc (loc
, TREE_TYPE (arg00
),
10813 if (operand_equal_p (arg00
, arg11
, 0))
10814 return fold_build2_loc (loc
, code
, type
, arg01
,
10815 fold_convert_loc (loc
, TREE_TYPE (arg01
),
10817 if (operand_equal_p (arg00
, arg10
, 0))
10818 return fold_build2_loc (loc
, code
, type
, arg01
,
10819 fold_convert_loc (loc
, TREE_TYPE (arg01
),
10822 /* Optimize (X ^ C1) op (Y ^ C2) as (X ^ (C1 ^ C2)) op Y. */
10823 if (TREE_CODE (arg01
) == INTEGER_CST
10824 && TREE_CODE (arg11
) == INTEGER_CST
)
10826 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
,
10827 fold_convert_loc (loc
, itype
, arg11
));
10828 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
10829 return fold_build2_loc (loc
, code
, type
, tem
,
10830 fold_convert_loc (loc
, itype
, arg10
));
10834 /* Attempt to simplify equality/inequality comparisons of complex
10835 values. Only lower the comparison if the result is known or
10836 can be simplified to a single scalar comparison. */
10837 if ((TREE_CODE (arg0
) == COMPLEX_EXPR
10838 || TREE_CODE (arg0
) == COMPLEX_CST
)
10839 && (TREE_CODE (arg1
) == COMPLEX_EXPR
10840 || TREE_CODE (arg1
) == COMPLEX_CST
))
10842 tree real0
, imag0
, real1
, imag1
;
10845 if (TREE_CODE (arg0
) == COMPLEX_EXPR
)
10847 real0
= TREE_OPERAND (arg0
, 0);
10848 imag0
= TREE_OPERAND (arg0
, 1);
10852 real0
= TREE_REALPART (arg0
);
10853 imag0
= TREE_IMAGPART (arg0
);
10856 if (TREE_CODE (arg1
) == COMPLEX_EXPR
)
10858 real1
= TREE_OPERAND (arg1
, 0);
10859 imag1
= TREE_OPERAND (arg1
, 1);
10863 real1
= TREE_REALPART (arg1
);
10864 imag1
= TREE_IMAGPART (arg1
);
10867 rcond
= fold_binary_loc (loc
, code
, type
, real0
, real1
);
10868 if (rcond
&& TREE_CODE (rcond
) == INTEGER_CST
)
10870 if (integer_zerop (rcond
))
10872 if (code
== EQ_EXPR
)
10873 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
10875 return fold_build2_loc (loc
, NE_EXPR
, type
, imag0
, imag1
);
10879 if (code
== NE_EXPR
)
10880 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
10882 return fold_build2_loc (loc
, EQ_EXPR
, type
, imag0
, imag1
);
10886 icond
= fold_binary_loc (loc
, code
, type
, imag0
, imag1
);
10887 if (icond
&& TREE_CODE (icond
) == INTEGER_CST
)
10889 if (integer_zerop (icond
))
10891 if (code
== EQ_EXPR
)
10892 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
10894 return fold_build2_loc (loc
, NE_EXPR
, type
, real0
, real1
);
10898 if (code
== NE_EXPR
)
10899 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
10901 return fold_build2_loc (loc
, EQ_EXPR
, type
, real0
, real1
);
10912 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
10913 if (tem
!= NULL_TREE
)
10916 /* Transform comparisons of the form X +- C CMP X. */
10917 if ((TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
10918 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0)
10919 && ((TREE_CODE (TREE_OPERAND (arg0
, 1)) == REAL_CST
10920 && !HONOR_SNANS (arg0
))
10921 || (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
10922 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))))
10924 tree arg01
= TREE_OPERAND (arg0
, 1);
10925 enum tree_code code0
= TREE_CODE (arg0
);
10928 if (TREE_CODE (arg01
) == REAL_CST
)
10929 is_positive
= REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg01
)) ? -1 : 1;
10931 is_positive
= tree_int_cst_sgn (arg01
);
10933 /* (X - c) > X becomes false. */
10934 if (code
== GT_EXPR
10935 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
10936 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
10938 if (TREE_CODE (arg01
) == INTEGER_CST
10939 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
10940 fold_overflow_warning (("assuming signed overflow does not "
10941 "occur when assuming that (X - c) > X "
10942 "is always false"),
10943 WARN_STRICT_OVERFLOW_ALL
);
10944 return constant_boolean_node (0, type
);
10947 /* Likewise (X + c) < X becomes false. */
10948 if (code
== LT_EXPR
10949 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
10950 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
10952 if (TREE_CODE (arg01
) == INTEGER_CST
10953 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
10954 fold_overflow_warning (("assuming signed overflow does not "
10955 "occur when assuming that "
10956 "(X + c) < X is always false"),
10957 WARN_STRICT_OVERFLOW_ALL
);
10958 return constant_boolean_node (0, type
);
10961 /* Convert (X - c) <= X to true. */
10962 if (!HONOR_NANS (arg1
)
10964 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
10965 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
10967 if (TREE_CODE (arg01
) == INTEGER_CST
10968 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
10969 fold_overflow_warning (("assuming signed overflow does not "
10970 "occur when assuming that "
10971 "(X - c) <= X is always true"),
10972 WARN_STRICT_OVERFLOW_ALL
);
10973 return constant_boolean_node (1, type
);
10976 /* Convert (X + c) >= X to true. */
10977 if (!HONOR_NANS (arg1
)
10979 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
10980 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
10982 if (TREE_CODE (arg01
) == INTEGER_CST
10983 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
10984 fold_overflow_warning (("assuming signed overflow does not "
10985 "occur when assuming that "
10986 "(X + c) >= X is always true"),
10987 WARN_STRICT_OVERFLOW_ALL
);
10988 return constant_boolean_node (1, type
);
10991 if (TREE_CODE (arg01
) == INTEGER_CST
)
10993 /* Convert X + c > X and X - c < X to true for integers. */
10994 if (code
== GT_EXPR
10995 && ((code0
== PLUS_EXPR
&& is_positive
> 0)
10996 || (code0
== MINUS_EXPR
&& is_positive
< 0)))
10998 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
10999 fold_overflow_warning (("assuming signed overflow does "
11000 "not occur when assuming that "
11001 "(X + c) > X is always true"),
11002 WARN_STRICT_OVERFLOW_ALL
);
11003 return constant_boolean_node (1, type
);
11006 if (code
== LT_EXPR
11007 && ((code0
== MINUS_EXPR
&& is_positive
> 0)
11008 || (code0
== PLUS_EXPR
&& is_positive
< 0)))
11010 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
11011 fold_overflow_warning (("assuming signed overflow does "
11012 "not occur when assuming that "
11013 "(X - c) < X is always true"),
11014 WARN_STRICT_OVERFLOW_ALL
);
11015 return constant_boolean_node (1, type
);
11018 /* Convert X + c <= X and X - c >= X to false for integers. */
11019 if (code
== LE_EXPR
11020 && ((code0
== PLUS_EXPR
&& is_positive
> 0)
11021 || (code0
== MINUS_EXPR
&& is_positive
< 0)))
11023 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
11024 fold_overflow_warning (("assuming signed overflow does "
11025 "not occur when assuming that "
11026 "(X + c) <= X is always false"),
11027 WARN_STRICT_OVERFLOW_ALL
);
11028 return constant_boolean_node (0, type
);
11031 if (code
== GE_EXPR
11032 && ((code0
== MINUS_EXPR
&& is_positive
> 0)
11033 || (code0
== PLUS_EXPR
&& is_positive
< 0)))
11035 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
11036 fold_overflow_warning (("assuming signed overflow does "
11037 "not occur when assuming that "
11038 "(X - c) >= X is always false"),
11039 WARN_STRICT_OVERFLOW_ALL
);
11040 return constant_boolean_node (0, type
);
11045 /* If we are comparing an ABS_EXPR with a constant, we can
11046 convert all the cases into explicit comparisons, but they may
11047 well not be faster than doing the ABS and one comparison.
11048 But ABS (X) <= C is a range comparison, which becomes a subtraction
11049 and a comparison, and is probably faster. */
11050 if (code
== LE_EXPR
11051 && TREE_CODE (arg1
) == INTEGER_CST
11052 && TREE_CODE (arg0
) == ABS_EXPR
11053 && ! TREE_SIDE_EFFECTS (arg0
)
11054 && (0 != (tem
= negate_expr (arg1
)))
11055 && TREE_CODE (tem
) == INTEGER_CST
11056 && !TREE_OVERFLOW (tem
))
11057 return fold_build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
11058 build2 (GE_EXPR
, type
,
11059 TREE_OPERAND (arg0
, 0), tem
),
11060 build2 (LE_EXPR
, type
,
11061 TREE_OPERAND (arg0
, 0), arg1
));
11063 /* Convert ABS_EXPR<x> >= 0 to true. */
11064 strict_overflow_p
= false;
11065 if (code
== GE_EXPR
11066 && (integer_zerop (arg1
)
11067 || (! HONOR_NANS (arg0
)
11068 && real_zerop (arg1
)))
11069 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
11071 if (strict_overflow_p
)
11072 fold_overflow_warning (("assuming signed overflow does not occur "
11073 "when simplifying comparison of "
11074 "absolute value and zero"),
11075 WARN_STRICT_OVERFLOW_CONDITIONAL
);
11076 return omit_one_operand_loc (loc
, type
,
11077 constant_boolean_node (true, type
),
11081 /* Convert ABS_EXPR<x> < 0 to false. */
11082 strict_overflow_p
= false;
11083 if (code
== LT_EXPR
11084 && (integer_zerop (arg1
) || real_zerop (arg1
))
11085 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
11087 if (strict_overflow_p
)
11088 fold_overflow_warning (("assuming signed overflow does not occur "
11089 "when simplifying comparison of "
11090 "absolute value and zero"),
11091 WARN_STRICT_OVERFLOW_CONDITIONAL
);
11092 return omit_one_operand_loc (loc
, type
,
11093 constant_boolean_node (false, type
),
11097 /* If X is unsigned, convert X < (1 << Y) into X >> Y == 0
11098 and similarly for >= into !=. */
11099 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
11100 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
11101 && TREE_CODE (arg1
) == LSHIFT_EXPR
11102 && integer_onep (TREE_OPERAND (arg1
, 0)))
11103 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
11104 build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
11105 TREE_OPERAND (arg1
, 1)),
11106 build_zero_cst (TREE_TYPE (arg0
)));
11108 /* Similarly for X < (cast) (1 << Y). But cast can't be narrowing,
11109 otherwise Y might be >= # of bits in X's type and thus e.g.
11110 (unsigned char) (1 << Y) for Y 15 might be 0.
11111 If the cast is widening, then 1 << Y should have unsigned type,
11112 otherwise if Y is number of bits in the signed shift type minus 1,
11113 we can't optimize this. E.g. (unsigned long long) (1 << Y) for Y
11114 31 might be 0xffffffff80000000. */
11115 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
11116 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
11117 && CONVERT_EXPR_P (arg1
)
11118 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == LSHIFT_EXPR
11119 && (element_precision (TREE_TYPE (arg1
))
11120 >= element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0))))
11121 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
11122 || (element_precision (TREE_TYPE (arg1
))
11123 == element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0)))))
11124 && integer_onep (TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0)))
11126 tem
= build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
11127 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1));
11128 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
11129 fold_convert_loc (loc
, TREE_TYPE (arg0
), tem
),
11130 build_zero_cst (TREE_TYPE (arg0
)));
11135 case UNORDERED_EXPR
:
11143 /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
11145 tree targ0
= strip_float_extensions (arg0
);
11146 tree targ1
= strip_float_extensions (arg1
);
11147 tree newtype
= TREE_TYPE (targ0
);
11149 if (TYPE_PRECISION (TREE_TYPE (targ1
)) > TYPE_PRECISION (newtype
))
11150 newtype
= TREE_TYPE (targ1
);
11152 if (TYPE_PRECISION (newtype
) < TYPE_PRECISION (TREE_TYPE (arg0
)))
11153 return fold_build2_loc (loc
, code
, type
,
11154 fold_convert_loc (loc
, newtype
, targ0
),
11155 fold_convert_loc (loc
, newtype
, targ1
));
11160 case COMPOUND_EXPR
:
11161 /* When pedantic, a compound expression can be neither an lvalue
11162 nor an integer constant expression. */
11163 if (TREE_SIDE_EFFECTS (arg0
) || TREE_CONSTANT (arg1
))
11165 /* Don't let (0, 0) be null pointer constant. */
11166 tem
= integer_zerop (arg1
) ? build1 (NOP_EXPR
, type
, arg1
)
11167 : fold_convert_loc (loc
, type
, arg1
);
11168 return pedantic_non_lvalue_loc (loc
, tem
);
11171 /* An ASSERT_EXPR should never be passed to fold_binary. */
11172 gcc_unreachable ();
11176 } /* switch (code) */
11179 /* Callback for walk_tree, looking for LABEL_EXPR. Return *TP if it is
11180 a LABEL_EXPR; otherwise return NULL_TREE. Do not check the subtrees
11184 contains_label_1 (tree
*tp
, int *walk_subtrees
, void *data ATTRIBUTE_UNUSED
)
11186 switch (TREE_CODE (*tp
))
11192 *walk_subtrees
= 0;
11201 /* Return whether the sub-tree ST contains a label which is accessible from
11202 outside the sub-tree. */
11205 contains_label_p (tree st
)
11208 (walk_tree_without_duplicates (&st
, contains_label_1
, NULL
) != NULL_TREE
);
11211 /* Fold a ternary expression of code CODE and type TYPE with operands
11212 OP0, OP1, and OP2. Return the folded expression if folding is
11213 successful. Otherwise, return NULL_TREE. */
11216 fold_ternary_loc (location_t loc
, enum tree_code code
, tree type
,
11217 tree op0
, tree op1
, tree op2
)
11220 tree arg0
= NULL_TREE
, arg1
= NULL_TREE
, arg2
= NULL_TREE
;
11221 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
11223 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
11224 && TREE_CODE_LENGTH (code
) == 3);
11226 /* If this is a commutative operation, and OP0 is a constant, move it
11227 to OP1 to reduce the number of tests below. */
11228 if (commutative_ternary_tree_code (code
)
11229 && tree_swap_operands_p (op0
, op1
))
11230 return fold_build3_loc (loc
, code
, type
, op1
, op0
, op2
);
11232 tem
= generic_simplify (loc
, code
, type
, op0
, op1
, op2
);
11236 /* Strip any conversions that don't change the mode. This is safe
11237 for every expression, except for a comparison expression because
11238 its signedness is derived from its operands. So, in the latter
11239 case, only strip conversions that don't change the signedness.
11241 Note that this is done as an internal manipulation within the
11242 constant folder, in order to find the simplest representation of
11243 the arguments so that their form can be studied. In any cases,
11244 the appropriate type conversions should be put back in the tree
11245 that will get out of the constant folder. */
11266 case COMPONENT_REF
:
11267 if (TREE_CODE (arg0
) == CONSTRUCTOR
11268 && ! type_contains_placeholder_p (TREE_TYPE (arg0
)))
11270 unsigned HOST_WIDE_INT idx
;
11272 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (arg0
), idx
, field
, value
)
11279 case VEC_COND_EXPR
:
11280 /* Pedantic ANSI C says that a conditional expression is never an lvalue,
11281 so all simple results must be passed through pedantic_non_lvalue. */
11282 if (TREE_CODE (arg0
) == INTEGER_CST
)
11284 tree unused_op
= integer_zerop (arg0
) ? op1
: op2
;
11285 tem
= integer_zerop (arg0
) ? op2
: op1
;
11286 /* Only optimize constant conditions when the selected branch
11287 has the same type as the COND_EXPR. This avoids optimizing
11288 away "c ? x : throw", where the throw has a void type.
11289 Avoid throwing away that operand which contains label. */
11290 if ((!TREE_SIDE_EFFECTS (unused_op
)
11291 || !contains_label_p (unused_op
))
11292 && (! VOID_TYPE_P (TREE_TYPE (tem
))
11293 || VOID_TYPE_P (type
)))
11294 return pedantic_non_lvalue_loc (loc
, tem
);
11297 else if (TREE_CODE (arg0
) == VECTOR_CST
)
11299 if ((TREE_CODE (arg1
) == VECTOR_CST
11300 || TREE_CODE (arg1
) == CONSTRUCTOR
)
11301 && (TREE_CODE (arg2
) == VECTOR_CST
11302 || TREE_CODE (arg2
) == CONSTRUCTOR
))
11304 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
11305 unsigned char *sel
= XALLOCAVEC (unsigned char, nelts
);
11306 gcc_assert (nelts
== VECTOR_CST_NELTS (arg0
));
11307 for (i
= 0; i
< nelts
; i
++)
11309 tree val
= VECTOR_CST_ELT (arg0
, i
);
11310 if (integer_all_onesp (val
))
11312 else if (integer_zerop (val
))
11313 sel
[i
] = nelts
+ i
;
11314 else /* Currently unreachable. */
11317 tree t
= fold_vec_perm (type
, arg1
, arg2
, sel
);
11318 if (t
!= NULL_TREE
)
11323 /* If we have A op B ? A : C, we may be able to convert this to a
11324 simpler expression, depending on the operation and the values
11325 of B and C. Signed zeros prevent all of these transformations,
11326 for reasons given above each one.
11328 Also try swapping the arguments and inverting the conditional. */
11329 if (COMPARISON_CLASS_P (arg0
)
11330 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0),
11331 arg1
, TREE_OPERAND (arg0
, 1))
11332 && !HONOR_SIGNED_ZEROS (element_mode (arg1
)))
11334 tem
= fold_cond_expr_with_comparison (loc
, type
, arg0
, op1
, op2
);
11339 if (COMPARISON_CLASS_P (arg0
)
11340 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0),
11342 TREE_OPERAND (arg0
, 1))
11343 && !HONOR_SIGNED_ZEROS (element_mode (op2
)))
11345 location_t loc0
= expr_location_or (arg0
, loc
);
11346 tem
= fold_invert_truthvalue (loc0
, arg0
);
11347 if (tem
&& COMPARISON_CLASS_P (tem
))
11349 tem
= fold_cond_expr_with_comparison (loc
, type
, tem
, op2
, op1
);
11355 /* If the second operand is simpler than the third, swap them
11356 since that produces better jump optimization results. */
11357 if (truth_value_p (TREE_CODE (arg0
))
11358 && tree_swap_operands_p (op1
, op2
))
11360 location_t loc0
= expr_location_or (arg0
, loc
);
11361 /* See if this can be inverted. If it can't, possibly because
11362 it was a floating-point inequality comparison, don't do
11364 tem
= fold_invert_truthvalue (loc0
, arg0
);
11366 return fold_build3_loc (loc
, code
, type
, tem
, op2
, op1
);
11369 /* Convert A ? 1 : 0 to simply A. */
11370 if ((code
== VEC_COND_EXPR
? integer_all_onesp (op1
)
11371 : (integer_onep (op1
)
11372 && !VECTOR_TYPE_P (type
)))
11373 && integer_zerop (op2
)
11374 /* If we try to convert OP0 to our type, the
11375 call to fold will try to move the conversion inside
11376 a COND, which will recurse. In that case, the COND_EXPR
11377 is probably the best choice, so leave it alone. */
11378 && type
== TREE_TYPE (arg0
))
11379 return pedantic_non_lvalue_loc (loc
, arg0
);
11381 /* Convert A ? 0 : 1 to !A. This prefers the use of NOT_EXPR
11382 over COND_EXPR in cases such as floating point comparisons. */
11383 if (integer_zerop (op1
)
11384 && code
== COND_EXPR
11385 && integer_onep (op2
)
11386 && !VECTOR_TYPE_P (type
)
11387 && truth_value_p (TREE_CODE (arg0
)))
11388 return pedantic_non_lvalue_loc (loc
,
11389 fold_convert_loc (loc
, type
,
11390 invert_truthvalue_loc (loc
,
11393 /* A < 0 ? <sign bit of A> : 0 is simply (A & <sign bit of A>). */
11394 if (TREE_CODE (arg0
) == LT_EXPR
11395 && integer_zerop (TREE_OPERAND (arg0
, 1))
11396 && integer_zerop (op2
)
11397 && (tem
= sign_bit_p (TREE_OPERAND (arg0
, 0), arg1
)))
11399 /* sign_bit_p looks through both zero and sign extensions,
11400 but for this optimization only sign extensions are
11402 tree tem2
= TREE_OPERAND (arg0
, 0);
11403 while (tem
!= tem2
)
11405 if (TREE_CODE (tem2
) != NOP_EXPR
11406 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (tem2
, 0))))
11411 tem2
= TREE_OPERAND (tem2
, 0);
11413 /* sign_bit_p only checks ARG1 bits within A's precision.
11414 If <sign bit of A> has wider type than A, bits outside
11415 of A's precision in <sign bit of A> need to be checked.
11416 If they are all 0, this optimization needs to be done
11417 in unsigned A's type, if they are all 1 in signed A's type,
11418 otherwise this can't be done. */
11420 && TYPE_PRECISION (TREE_TYPE (tem
))
11421 < TYPE_PRECISION (TREE_TYPE (arg1
))
11422 && TYPE_PRECISION (TREE_TYPE (tem
))
11423 < TYPE_PRECISION (type
))
11425 int inner_width
, outer_width
;
11428 inner_width
= TYPE_PRECISION (TREE_TYPE (tem
));
11429 outer_width
= TYPE_PRECISION (TREE_TYPE (arg1
));
11430 if (outer_width
> TYPE_PRECISION (type
))
11431 outer_width
= TYPE_PRECISION (type
);
11433 wide_int mask
= wi::shifted_mask
11434 (inner_width
, outer_width
- inner_width
, false,
11435 TYPE_PRECISION (TREE_TYPE (arg1
)));
11437 wide_int common
= mask
& arg1
;
11438 if (common
== mask
)
11440 tem_type
= signed_type_for (TREE_TYPE (tem
));
11441 tem
= fold_convert_loc (loc
, tem_type
, tem
);
11443 else if (common
== 0)
11445 tem_type
= unsigned_type_for (TREE_TYPE (tem
));
11446 tem
= fold_convert_loc (loc
, tem_type
, tem
);
11454 fold_convert_loc (loc
, type
,
11455 fold_build2_loc (loc
, BIT_AND_EXPR
,
11456 TREE_TYPE (tem
), tem
,
11457 fold_convert_loc (loc
,
11462 /* (A >> N) & 1 ? (1 << N) : 0 is simply A & (1 << N). A & 1 was
11463 already handled above. */
11464 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11465 && integer_onep (TREE_OPERAND (arg0
, 1))
11466 && integer_zerop (op2
)
11467 && integer_pow2p (arg1
))
11469 tree tem
= TREE_OPERAND (arg0
, 0);
11471 if (TREE_CODE (tem
) == RSHIFT_EXPR
11472 && tree_fits_uhwi_p (TREE_OPERAND (tem
, 1))
11473 && (unsigned HOST_WIDE_INT
) tree_log2 (arg1
)
11474 == tree_to_uhwi (TREE_OPERAND (tem
, 1)))
11475 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
11476 fold_convert_loc (loc
, type
,
11477 TREE_OPERAND (tem
, 0)),
11481 /* A & N ? N : 0 is simply A & N if N is a power of two. This
11482 is probably obsolete because the first operand should be a
11483 truth value (that's why we have the two cases above), but let's
11484 leave it in until we can confirm this for all front-ends. */
11485 if (integer_zerop (op2
)
11486 && TREE_CODE (arg0
) == NE_EXPR
11487 && integer_zerop (TREE_OPERAND (arg0
, 1))
11488 && integer_pow2p (arg1
)
11489 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
11490 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
11491 arg1
, OEP_ONLY_CONST
))
11492 return pedantic_non_lvalue_loc (loc
,
11493 fold_convert_loc (loc
, type
,
11494 TREE_OPERAND (arg0
, 0)));
11496 /* Disable the transformations below for vectors, since
11497 fold_binary_op_with_conditional_arg may undo them immediately,
11498 yielding an infinite loop. */
11499 if (code
== VEC_COND_EXPR
)
11502 /* Convert A ? B : 0 into A && B if A and B are truth values. */
11503 if (integer_zerop (op2
)
11504 && truth_value_p (TREE_CODE (arg0
))
11505 && truth_value_p (TREE_CODE (arg1
))
11506 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
11507 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
? BIT_AND_EXPR
11508 : TRUTH_ANDIF_EXPR
,
11509 type
, fold_convert_loc (loc
, type
, arg0
), op1
);
11511 /* Convert A ? B : 1 into !A || B if A and B are truth values. */
11512 if (code
== VEC_COND_EXPR
? integer_all_onesp (op2
) : integer_onep (op2
)
11513 && truth_value_p (TREE_CODE (arg0
))
11514 && truth_value_p (TREE_CODE (arg1
))
11515 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
11517 location_t loc0
= expr_location_or (arg0
, loc
);
11518 /* Only perform transformation if ARG0 is easily inverted. */
11519 tem
= fold_invert_truthvalue (loc0
, arg0
);
11521 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
11524 type
, fold_convert_loc (loc
, type
, tem
),
11528 /* Convert A ? 0 : B into !A && B if A and B are truth values. */
11529 if (integer_zerop (arg1
)
11530 && truth_value_p (TREE_CODE (arg0
))
11531 && truth_value_p (TREE_CODE (op2
))
11532 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
11534 location_t loc0
= expr_location_or (arg0
, loc
);
11535 /* Only perform transformation if ARG0 is easily inverted. */
11536 tem
= fold_invert_truthvalue (loc0
, arg0
);
11538 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
11539 ? BIT_AND_EXPR
: TRUTH_ANDIF_EXPR
,
11540 type
, fold_convert_loc (loc
, type
, tem
),
11544 /* Convert A ? 1 : B into A || B if A and B are truth values. */
11545 if (code
== VEC_COND_EXPR
? integer_all_onesp (arg1
) : integer_onep (arg1
)
11546 && truth_value_p (TREE_CODE (arg0
))
11547 && truth_value_p (TREE_CODE (op2
))
11548 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
11549 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
11550 ? BIT_IOR_EXPR
: TRUTH_ORIF_EXPR
,
11551 type
, fold_convert_loc (loc
, type
, arg0
), op2
);
11556 /* CALL_EXPRs used to be ternary exprs. Catch any mistaken uses
11557 of fold_ternary on them. */
11558 gcc_unreachable ();
11560 case BIT_FIELD_REF
:
11561 if (TREE_CODE (arg0
) == VECTOR_CST
11562 && (type
== TREE_TYPE (TREE_TYPE (arg0
))
11563 || (TREE_CODE (type
) == VECTOR_TYPE
11564 && TREE_TYPE (type
) == TREE_TYPE (TREE_TYPE (arg0
)))))
11566 tree eltype
= TREE_TYPE (TREE_TYPE (arg0
));
11567 unsigned HOST_WIDE_INT width
= tree_to_uhwi (TYPE_SIZE (eltype
));
11568 unsigned HOST_WIDE_INT n
= tree_to_uhwi (arg1
);
11569 unsigned HOST_WIDE_INT idx
= tree_to_uhwi (op2
);
11572 && (idx
% width
) == 0
11573 && (n
% width
) == 0
11574 && ((idx
+ n
) / width
) <= TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)))
11579 if (TREE_CODE (arg0
) == VECTOR_CST
)
11582 return VECTOR_CST_ELT (arg0
, idx
);
11584 tree
*vals
= XALLOCAVEC (tree
, n
);
11585 for (unsigned i
= 0; i
< n
; ++i
)
11586 vals
[i
] = VECTOR_CST_ELT (arg0
, idx
+ i
);
11587 return build_vector (type
, vals
);
11592 /* On constants we can use native encode/interpret to constant
11593 fold (nearly) all BIT_FIELD_REFs. */
11594 if (CONSTANT_CLASS_P (arg0
)
11595 && can_native_interpret_type_p (type
)
11596 && BITS_PER_UNIT
== 8)
11598 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
11599 unsigned HOST_WIDE_INT bitsize
= tree_to_uhwi (op1
);
11600 /* Limit us to a reasonable amount of work. To relax the
11601 other limitations we need bit-shifting of the buffer
11602 and rounding up the size. */
11603 if (bitpos
% BITS_PER_UNIT
== 0
11604 && bitsize
% BITS_PER_UNIT
== 0
11605 && bitsize
<= MAX_BITSIZE_MODE_ANY_MODE
)
11607 unsigned char b
[MAX_BITSIZE_MODE_ANY_MODE
/ BITS_PER_UNIT
];
11608 unsigned HOST_WIDE_INT len
11609 = native_encode_expr (arg0
, b
, bitsize
/ BITS_PER_UNIT
,
11610 bitpos
/ BITS_PER_UNIT
);
11612 && len
* BITS_PER_UNIT
>= bitsize
)
11614 tree v
= native_interpret_expr (type
, b
,
11615 bitsize
/ BITS_PER_UNIT
);
11625 /* For integers we can decompose the FMA if possible. */
11626 if (TREE_CODE (arg0
) == INTEGER_CST
11627 && TREE_CODE (arg1
) == INTEGER_CST
)
11628 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
11629 const_binop (MULT_EXPR
, arg0
, arg1
), arg2
);
11630 if (integer_zerop (arg2
))
11631 return fold_build2_loc (loc
, MULT_EXPR
, type
, arg0
, arg1
);
11633 return fold_fma (loc
, type
, arg0
, arg1
, arg2
);
11635 case VEC_PERM_EXPR
:
11636 if (TREE_CODE (arg2
) == VECTOR_CST
)
11638 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
, mask
, mask2
;
11639 unsigned char *sel
= XALLOCAVEC (unsigned char, 2 * nelts
);
11640 unsigned char *sel2
= sel
+ nelts
;
11641 bool need_mask_canon
= false;
11642 bool need_mask_canon2
= false;
11643 bool all_in_vec0
= true;
11644 bool all_in_vec1
= true;
11645 bool maybe_identity
= true;
11646 bool single_arg
= (op0
== op1
);
11647 bool changed
= false;
11649 mask2
= 2 * nelts
- 1;
11650 mask
= single_arg
? (nelts
- 1) : mask2
;
11651 gcc_assert (nelts
== VECTOR_CST_NELTS (arg2
));
11652 for (i
= 0; i
< nelts
; i
++)
11654 tree val
= VECTOR_CST_ELT (arg2
, i
);
11655 if (TREE_CODE (val
) != INTEGER_CST
)
11658 /* Make sure that the perm value is in an acceptable
11661 need_mask_canon
|= wi::gtu_p (t
, mask
);
11662 need_mask_canon2
|= wi::gtu_p (t
, mask2
);
11663 sel
[i
] = t
.to_uhwi () & mask
;
11664 sel2
[i
] = t
.to_uhwi () & mask2
;
11666 if (sel
[i
] < nelts
)
11667 all_in_vec1
= false;
11669 all_in_vec0
= false;
11671 if ((sel
[i
] & (nelts
-1)) != i
)
11672 maybe_identity
= false;
11675 if (maybe_identity
)
11685 else if (all_in_vec1
)
11688 for (i
= 0; i
< nelts
; i
++)
11690 need_mask_canon
= true;
11693 if ((TREE_CODE (op0
) == VECTOR_CST
11694 || TREE_CODE (op0
) == CONSTRUCTOR
)
11695 && (TREE_CODE (op1
) == VECTOR_CST
11696 || TREE_CODE (op1
) == CONSTRUCTOR
))
11698 tree t
= fold_vec_perm (type
, op0
, op1
, sel
);
11699 if (t
!= NULL_TREE
)
11703 if (op0
== op1
&& !single_arg
)
11706 /* Some targets are deficient and fail to expand a single
11707 argument permutation while still allowing an equivalent
11708 2-argument version. */
11709 if (need_mask_canon
&& arg2
== op2
11710 && !can_vec_perm_p (TYPE_MODE (type
), false, sel
)
11711 && can_vec_perm_p (TYPE_MODE (type
), false, sel2
))
11713 need_mask_canon
= need_mask_canon2
;
11717 if (need_mask_canon
&& arg2
== op2
)
11719 tree
*tsel
= XALLOCAVEC (tree
, nelts
);
11720 tree eltype
= TREE_TYPE (TREE_TYPE (arg2
));
11721 for (i
= 0; i
< nelts
; i
++)
11722 tsel
[i
] = build_int_cst (eltype
, sel
[i
]);
11723 op2
= build_vector (TREE_TYPE (arg2
), tsel
);
11728 return build3_loc (loc
, VEC_PERM_EXPR
, type
, op0
, op1
, op2
);
11732 case BIT_INSERT_EXPR
:
11733 /* Perform (partial) constant folding of BIT_INSERT_EXPR. */
11734 if (TREE_CODE (arg0
) == INTEGER_CST
11735 && TREE_CODE (arg1
) == INTEGER_CST
)
11737 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
11738 unsigned bitsize
= TYPE_PRECISION (TREE_TYPE (arg1
));
11739 wide_int tem
= wi::bit_and (arg0
,
11740 wi::shifted_mask (bitpos
, bitsize
, true,
11741 TYPE_PRECISION (type
)));
11743 = wi::lshift (wi::zext (wi::to_wide (arg1
, TYPE_PRECISION (type
)),
11745 return wide_int_to_tree (type
, wi::bit_or (tem
, tem2
));
11747 else if (TREE_CODE (arg0
) == VECTOR_CST
11748 && CONSTANT_CLASS_P (arg1
)
11749 && types_compatible_p (TREE_TYPE (TREE_TYPE (arg0
)),
11752 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
11753 unsigned HOST_WIDE_INT elsize
11754 = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (arg1
)));
11755 if (bitpos
% elsize
== 0)
11757 unsigned k
= bitpos
/ elsize
;
11758 if (operand_equal_p (VECTOR_CST_ELT (arg0
, k
), arg1
, 0))
11762 tree
*elts
= XALLOCAVEC (tree
, TYPE_VECTOR_SUBPARTS (type
));
11763 memcpy (elts
, VECTOR_CST_ELTS (arg0
),
11764 sizeof (tree
) * TYPE_VECTOR_SUBPARTS (type
));
11766 return build_vector (type
, elts
);
11774 } /* switch (code) */
11777 /* Gets the element ACCESS_INDEX from CTOR, which must be a CONSTRUCTOR
11778 of an array (or vector). */
11781 get_array_ctor_element_at_index (tree ctor
, offset_int access_index
)
11783 tree index_type
= NULL_TREE
;
11784 offset_int low_bound
= 0;
11786 if (TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
)
11788 tree domain_type
= TYPE_DOMAIN (TREE_TYPE (ctor
));
11789 if (domain_type
&& TYPE_MIN_VALUE (domain_type
))
11791 /* Static constructors for variably sized objects makes no sense. */
11792 gcc_assert (TREE_CODE (TYPE_MIN_VALUE (domain_type
)) == INTEGER_CST
);
11793 index_type
= TREE_TYPE (TYPE_MIN_VALUE (domain_type
));
11794 low_bound
= wi::to_offset (TYPE_MIN_VALUE (domain_type
));
11799 access_index
= wi::ext (access_index
, TYPE_PRECISION (index_type
),
11800 TYPE_SIGN (index_type
));
11802 offset_int index
= low_bound
- 1;
11804 index
= wi::ext (index
, TYPE_PRECISION (index_type
),
11805 TYPE_SIGN (index_type
));
11807 offset_int max_index
;
11808 unsigned HOST_WIDE_INT cnt
;
11811 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor
), cnt
, cfield
, cval
)
11813 /* Array constructor might explicitly set index, or specify a range,
11814 or leave index NULL meaning that it is next index after previous
11818 if (TREE_CODE (cfield
) == INTEGER_CST
)
11819 max_index
= index
= wi::to_offset (cfield
);
11822 gcc_assert (TREE_CODE (cfield
) == RANGE_EXPR
);
11823 index
= wi::to_offset (TREE_OPERAND (cfield
, 0));
11824 max_index
= wi::to_offset (TREE_OPERAND (cfield
, 1));
11831 index
= wi::ext (index
, TYPE_PRECISION (index_type
),
11832 TYPE_SIGN (index_type
));
11836 /* Do we have match? */
11837 if (wi::cmpu (access_index
, index
) >= 0
11838 && wi::cmpu (access_index
, max_index
) <= 0)
11844 /* Perform constant folding and related simplification of EXPR.
11845 The related simplifications include x*1 => x, x*0 => 0, etc.,
11846 and application of the associative law.
11847 NOP_EXPR conversions may be removed freely (as long as we
11848 are careful not to change the type of the overall expression).
11849 We cannot simplify through a CONVERT_EXPR, FIX_EXPR or FLOAT_EXPR,
11850 but we can constant-fold them if they have constant operands. */
11852 #ifdef ENABLE_FOLD_CHECKING
11853 # define fold(x) fold_1 (x)
11854 static tree
fold_1 (tree
);
11860 const tree t
= expr
;
11861 enum tree_code code
= TREE_CODE (t
);
11862 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
11864 location_t loc
= EXPR_LOCATION (expr
);
11866 /* Return right away if a constant. */
11867 if (kind
== tcc_constant
)
11870 /* CALL_EXPR-like objects with variable numbers of operands are
11871 treated specially. */
11872 if (kind
== tcc_vl_exp
)
11874 if (code
== CALL_EXPR
)
11876 tem
= fold_call_expr (loc
, expr
, false);
11877 return tem
? tem
: expr
;
11882 if (IS_EXPR_CODE_CLASS (kind
))
11884 tree type
= TREE_TYPE (t
);
11885 tree op0
, op1
, op2
;
11887 switch (TREE_CODE_LENGTH (code
))
11890 op0
= TREE_OPERAND (t
, 0);
11891 tem
= fold_unary_loc (loc
, code
, type
, op0
);
11892 return tem
? tem
: expr
;
11894 op0
= TREE_OPERAND (t
, 0);
11895 op1
= TREE_OPERAND (t
, 1);
11896 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
11897 return tem
? tem
: expr
;
11899 op0
= TREE_OPERAND (t
, 0);
11900 op1
= TREE_OPERAND (t
, 1);
11901 op2
= TREE_OPERAND (t
, 2);
11902 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
11903 return tem
? tem
: expr
;
11913 tree op0
= TREE_OPERAND (t
, 0);
11914 tree op1
= TREE_OPERAND (t
, 1);
11916 if (TREE_CODE (op1
) == INTEGER_CST
11917 && TREE_CODE (op0
) == CONSTRUCTOR
11918 && ! type_contains_placeholder_p (TREE_TYPE (op0
)))
11920 tree val
= get_array_ctor_element_at_index (op0
,
11921 wi::to_offset (op1
));
11929 /* Return a VECTOR_CST if possible. */
11932 tree type
= TREE_TYPE (t
);
11933 if (TREE_CODE (type
) != VECTOR_TYPE
)
11938 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (t
), i
, val
)
11939 if (! CONSTANT_CLASS_P (val
))
11942 return build_vector_from_ctor (type
, CONSTRUCTOR_ELTS (t
));
11946 return fold (DECL_INITIAL (t
));
11950 } /* switch (code) */
11953 #ifdef ENABLE_FOLD_CHECKING
11956 static void fold_checksum_tree (const_tree
, struct md5_ctx
*,
11957 hash_table
<nofree_ptr_hash
<const tree_node
> > *);
11958 static void fold_check_failed (const_tree
, const_tree
);
11959 void print_fold_checksum (const_tree
);
11961 /* When --enable-checking=fold, compute a digest of expr before
11962 and after actual fold call to see if fold did not accidentally
11963 change original expr. */
11969 struct md5_ctx ctx
;
11970 unsigned char checksum_before
[16], checksum_after
[16];
11971 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
11973 md5_init_ctx (&ctx
);
11974 fold_checksum_tree (expr
, &ctx
, &ht
);
11975 md5_finish_ctx (&ctx
, checksum_before
);
11978 ret
= fold_1 (expr
);
11980 md5_init_ctx (&ctx
);
11981 fold_checksum_tree (expr
, &ctx
, &ht
);
11982 md5_finish_ctx (&ctx
, checksum_after
);
11984 if (memcmp (checksum_before
, checksum_after
, 16))
11985 fold_check_failed (expr
, ret
);
11991 print_fold_checksum (const_tree expr
)
11993 struct md5_ctx ctx
;
11994 unsigned char checksum
[16], cnt
;
11995 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
11997 md5_init_ctx (&ctx
);
11998 fold_checksum_tree (expr
, &ctx
, &ht
);
11999 md5_finish_ctx (&ctx
, checksum
);
12000 for (cnt
= 0; cnt
< 16; ++cnt
)
12001 fprintf (stderr
, "%02x", checksum
[cnt
]);
12002 putc ('\n', stderr
);
12006 fold_check_failed (const_tree expr ATTRIBUTE_UNUSED
, const_tree ret ATTRIBUTE_UNUSED
)
12008 internal_error ("fold check: original tree changed by fold");
12012 fold_checksum_tree (const_tree expr
, struct md5_ctx
*ctx
,
12013 hash_table
<nofree_ptr_hash
<const tree_node
> > *ht
)
12015 const tree_node
**slot
;
12016 enum tree_code code
;
12017 union tree_node buf
;
12023 slot
= ht
->find_slot (expr
, INSERT
);
12027 code
= TREE_CODE (expr
);
12028 if (TREE_CODE_CLASS (code
) == tcc_declaration
12029 && HAS_DECL_ASSEMBLER_NAME_P (expr
))
12031 /* Allow DECL_ASSEMBLER_NAME and symtab_node to be modified. */
12032 memcpy ((char *) &buf
, expr
, tree_size (expr
));
12033 SET_DECL_ASSEMBLER_NAME ((tree
)&buf
, NULL
);
12034 buf
.decl_with_vis
.symtab_node
= NULL
;
12035 expr
= (tree
) &buf
;
12037 else if (TREE_CODE_CLASS (code
) == tcc_type
12038 && (TYPE_POINTER_TO (expr
)
12039 || TYPE_REFERENCE_TO (expr
)
12040 || TYPE_CACHED_VALUES_P (expr
)
12041 || TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr
)
12042 || TYPE_NEXT_VARIANT (expr
)
12043 || TYPE_ALIAS_SET_KNOWN_P (expr
)))
12045 /* Allow these fields to be modified. */
12047 memcpy ((char *) &buf
, expr
, tree_size (expr
));
12048 expr
= tmp
= (tree
) &buf
;
12049 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (tmp
) = 0;
12050 TYPE_POINTER_TO (tmp
) = NULL
;
12051 TYPE_REFERENCE_TO (tmp
) = NULL
;
12052 TYPE_NEXT_VARIANT (tmp
) = NULL
;
12053 TYPE_ALIAS_SET (tmp
) = -1;
12054 if (TYPE_CACHED_VALUES_P (tmp
))
12056 TYPE_CACHED_VALUES_P (tmp
) = 0;
12057 TYPE_CACHED_VALUES (tmp
) = NULL
;
12060 md5_process_bytes (expr
, tree_size (expr
), ctx
);
12061 if (CODE_CONTAINS_STRUCT (code
, TS_TYPED
))
12062 fold_checksum_tree (TREE_TYPE (expr
), ctx
, ht
);
12063 if (TREE_CODE_CLASS (code
) != tcc_type
12064 && TREE_CODE_CLASS (code
) != tcc_declaration
12065 && code
!= TREE_LIST
12066 && code
!= SSA_NAME
12067 && CODE_CONTAINS_STRUCT (code
, TS_COMMON
))
12068 fold_checksum_tree (TREE_CHAIN (expr
), ctx
, ht
);
12069 switch (TREE_CODE_CLASS (code
))
12075 md5_process_bytes (TREE_STRING_POINTER (expr
),
12076 TREE_STRING_LENGTH (expr
), ctx
);
12079 fold_checksum_tree (TREE_REALPART (expr
), ctx
, ht
);
12080 fold_checksum_tree (TREE_IMAGPART (expr
), ctx
, ht
);
12083 for (i
= 0; i
< (int) VECTOR_CST_NELTS (expr
); ++i
)
12084 fold_checksum_tree (VECTOR_CST_ELT (expr
, i
), ctx
, ht
);
12090 case tcc_exceptional
:
12094 fold_checksum_tree (TREE_PURPOSE (expr
), ctx
, ht
);
12095 fold_checksum_tree (TREE_VALUE (expr
), ctx
, ht
);
12096 expr
= TREE_CHAIN (expr
);
12097 goto recursive_label
;
12100 for (i
= 0; i
< TREE_VEC_LENGTH (expr
); ++i
)
12101 fold_checksum_tree (TREE_VEC_ELT (expr
, i
), ctx
, ht
);
12107 case tcc_expression
:
12108 case tcc_reference
:
12109 case tcc_comparison
:
12112 case tcc_statement
:
12114 len
= TREE_OPERAND_LENGTH (expr
);
12115 for (i
= 0; i
< len
; ++i
)
12116 fold_checksum_tree (TREE_OPERAND (expr
, i
), ctx
, ht
);
12118 case tcc_declaration
:
12119 fold_checksum_tree (DECL_NAME (expr
), ctx
, ht
);
12120 fold_checksum_tree (DECL_CONTEXT (expr
), ctx
, ht
);
12121 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_COMMON
))
12123 fold_checksum_tree (DECL_SIZE (expr
), ctx
, ht
);
12124 fold_checksum_tree (DECL_SIZE_UNIT (expr
), ctx
, ht
);
12125 fold_checksum_tree (DECL_INITIAL (expr
), ctx
, ht
);
12126 fold_checksum_tree (DECL_ABSTRACT_ORIGIN (expr
), ctx
, ht
);
12127 fold_checksum_tree (DECL_ATTRIBUTES (expr
), ctx
, ht
);
12130 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_NON_COMMON
))
12132 if (TREE_CODE (expr
) == FUNCTION_DECL
)
12134 fold_checksum_tree (DECL_VINDEX (expr
), ctx
, ht
);
12135 fold_checksum_tree (DECL_ARGUMENTS (expr
), ctx
, ht
);
12137 fold_checksum_tree (DECL_RESULT_FLD (expr
), ctx
, ht
);
12141 if (TREE_CODE (expr
) == ENUMERAL_TYPE
)
12142 fold_checksum_tree (TYPE_VALUES (expr
), ctx
, ht
);
12143 fold_checksum_tree (TYPE_SIZE (expr
), ctx
, ht
);
12144 fold_checksum_tree (TYPE_SIZE_UNIT (expr
), ctx
, ht
);
12145 fold_checksum_tree (TYPE_ATTRIBUTES (expr
), ctx
, ht
);
12146 fold_checksum_tree (TYPE_NAME (expr
), ctx
, ht
);
12147 if (INTEGRAL_TYPE_P (expr
)
12148 || SCALAR_FLOAT_TYPE_P (expr
))
12150 fold_checksum_tree (TYPE_MIN_VALUE (expr
), ctx
, ht
);
12151 fold_checksum_tree (TYPE_MAX_VALUE (expr
), ctx
, ht
);
12153 fold_checksum_tree (TYPE_MAIN_VARIANT (expr
), ctx
, ht
);
12154 if (TREE_CODE (expr
) == RECORD_TYPE
12155 || TREE_CODE (expr
) == UNION_TYPE
12156 || TREE_CODE (expr
) == QUAL_UNION_TYPE
)
12157 fold_checksum_tree (TYPE_BINFO (expr
), ctx
, ht
);
12158 fold_checksum_tree (TYPE_CONTEXT (expr
), ctx
, ht
);
12165 /* Helper function for outputting the checksum of a tree T. When
12166 debugging with gdb, you can "define mynext" to be "next" followed
12167 by "call debug_fold_checksum (op0)", then just trace down till the
12170 DEBUG_FUNCTION
void
12171 debug_fold_checksum (const_tree t
)
12174 unsigned char checksum
[16];
12175 struct md5_ctx ctx
;
12176 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12178 md5_init_ctx (&ctx
);
12179 fold_checksum_tree (t
, &ctx
, &ht
);
12180 md5_finish_ctx (&ctx
, checksum
);
12183 for (i
= 0; i
< 16; i
++)
12184 fprintf (stderr
, "%d ", checksum
[i
]);
12186 fprintf (stderr
, "\n");
12191 /* Fold a unary tree expression with code CODE of type TYPE with an
12192 operand OP0. LOC is the location of the resulting expression.
12193 Return a folded expression if successful. Otherwise, return a tree
12194 expression with code CODE of type TYPE with an operand OP0. */
12197 fold_build1_stat_loc (location_t loc
,
12198 enum tree_code code
, tree type
, tree op0 MEM_STAT_DECL
)
12201 #ifdef ENABLE_FOLD_CHECKING
12202 unsigned char checksum_before
[16], checksum_after
[16];
12203 struct md5_ctx ctx
;
12204 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12206 md5_init_ctx (&ctx
);
12207 fold_checksum_tree (op0
, &ctx
, &ht
);
12208 md5_finish_ctx (&ctx
, checksum_before
);
12212 tem
= fold_unary_loc (loc
, code
, type
, op0
);
12214 tem
= build1_stat_loc (loc
, code
, type
, op0 PASS_MEM_STAT
);
12216 #ifdef ENABLE_FOLD_CHECKING
12217 md5_init_ctx (&ctx
);
12218 fold_checksum_tree (op0
, &ctx
, &ht
);
12219 md5_finish_ctx (&ctx
, checksum_after
);
12221 if (memcmp (checksum_before
, checksum_after
, 16))
12222 fold_check_failed (op0
, tem
);
12227 /* Fold a binary tree expression with code CODE of type TYPE with
12228 operands OP0 and OP1. LOC is the location of the resulting
12229 expression. Return a folded expression if successful. Otherwise,
12230 return a tree expression with code CODE of type TYPE with operands
12234 fold_build2_stat_loc (location_t loc
,
12235 enum tree_code code
, tree type
, tree op0
, tree op1
12239 #ifdef ENABLE_FOLD_CHECKING
12240 unsigned char checksum_before_op0
[16],
12241 checksum_before_op1
[16],
12242 checksum_after_op0
[16],
12243 checksum_after_op1
[16];
12244 struct md5_ctx ctx
;
12245 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12247 md5_init_ctx (&ctx
);
12248 fold_checksum_tree (op0
, &ctx
, &ht
);
12249 md5_finish_ctx (&ctx
, checksum_before_op0
);
12252 md5_init_ctx (&ctx
);
12253 fold_checksum_tree (op1
, &ctx
, &ht
);
12254 md5_finish_ctx (&ctx
, checksum_before_op1
);
12258 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
12260 tem
= build2_stat_loc (loc
, code
, type
, op0
, op1 PASS_MEM_STAT
);
12262 #ifdef ENABLE_FOLD_CHECKING
12263 md5_init_ctx (&ctx
);
12264 fold_checksum_tree (op0
, &ctx
, &ht
);
12265 md5_finish_ctx (&ctx
, checksum_after_op0
);
12268 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
12269 fold_check_failed (op0
, tem
);
12271 md5_init_ctx (&ctx
);
12272 fold_checksum_tree (op1
, &ctx
, &ht
);
12273 md5_finish_ctx (&ctx
, checksum_after_op1
);
12275 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
12276 fold_check_failed (op1
, tem
);
12281 /* Fold a ternary tree expression with code CODE of type TYPE with
12282 operands OP0, OP1, and OP2. Return a folded expression if
12283 successful. Otherwise, return a tree expression with code CODE of
12284 type TYPE with operands OP0, OP1, and OP2. */
12287 fold_build3_stat_loc (location_t loc
, enum tree_code code
, tree type
,
12288 tree op0
, tree op1
, tree op2 MEM_STAT_DECL
)
12291 #ifdef ENABLE_FOLD_CHECKING
12292 unsigned char checksum_before_op0
[16],
12293 checksum_before_op1
[16],
12294 checksum_before_op2
[16],
12295 checksum_after_op0
[16],
12296 checksum_after_op1
[16],
12297 checksum_after_op2
[16];
12298 struct md5_ctx ctx
;
12299 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12301 md5_init_ctx (&ctx
);
12302 fold_checksum_tree (op0
, &ctx
, &ht
);
12303 md5_finish_ctx (&ctx
, checksum_before_op0
);
12306 md5_init_ctx (&ctx
);
12307 fold_checksum_tree (op1
, &ctx
, &ht
);
12308 md5_finish_ctx (&ctx
, checksum_before_op1
);
12311 md5_init_ctx (&ctx
);
12312 fold_checksum_tree (op2
, &ctx
, &ht
);
12313 md5_finish_ctx (&ctx
, checksum_before_op2
);
12317 gcc_assert (TREE_CODE_CLASS (code
) != tcc_vl_exp
);
12318 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
12320 tem
= build3_stat_loc (loc
, code
, type
, op0
, op1
, op2 PASS_MEM_STAT
);
12322 #ifdef ENABLE_FOLD_CHECKING
12323 md5_init_ctx (&ctx
);
12324 fold_checksum_tree (op0
, &ctx
, &ht
);
12325 md5_finish_ctx (&ctx
, checksum_after_op0
);
12328 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
12329 fold_check_failed (op0
, tem
);
12331 md5_init_ctx (&ctx
);
12332 fold_checksum_tree (op1
, &ctx
, &ht
);
12333 md5_finish_ctx (&ctx
, checksum_after_op1
);
12336 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
12337 fold_check_failed (op1
, tem
);
12339 md5_init_ctx (&ctx
);
12340 fold_checksum_tree (op2
, &ctx
, &ht
);
12341 md5_finish_ctx (&ctx
, checksum_after_op2
);
12343 if (memcmp (checksum_before_op2
, checksum_after_op2
, 16))
12344 fold_check_failed (op2
, tem
);
12349 /* Fold a CALL_EXPR expression of type TYPE with operands FN and NARGS
12350 arguments in ARGARRAY, and a null static chain.
12351 Return a folded expression if successful. Otherwise, return a CALL_EXPR
12352 of type TYPE from the given operands as constructed by build_call_array. */
12355 fold_build_call_array_loc (location_t loc
, tree type
, tree fn
,
12356 int nargs
, tree
*argarray
)
12359 #ifdef ENABLE_FOLD_CHECKING
12360 unsigned char checksum_before_fn
[16],
12361 checksum_before_arglist
[16],
12362 checksum_after_fn
[16],
12363 checksum_after_arglist
[16];
12364 struct md5_ctx ctx
;
12365 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12368 md5_init_ctx (&ctx
);
12369 fold_checksum_tree (fn
, &ctx
, &ht
);
12370 md5_finish_ctx (&ctx
, checksum_before_fn
);
12373 md5_init_ctx (&ctx
);
12374 for (i
= 0; i
< nargs
; i
++)
12375 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
12376 md5_finish_ctx (&ctx
, checksum_before_arglist
);
12380 tem
= fold_builtin_call_array (loc
, type
, fn
, nargs
, argarray
);
12382 tem
= build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
12384 #ifdef ENABLE_FOLD_CHECKING
12385 md5_init_ctx (&ctx
);
12386 fold_checksum_tree (fn
, &ctx
, &ht
);
12387 md5_finish_ctx (&ctx
, checksum_after_fn
);
12390 if (memcmp (checksum_before_fn
, checksum_after_fn
, 16))
12391 fold_check_failed (fn
, tem
);
12393 md5_init_ctx (&ctx
);
12394 for (i
= 0; i
< nargs
; i
++)
12395 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
12396 md5_finish_ctx (&ctx
, checksum_after_arglist
);
12398 if (memcmp (checksum_before_arglist
, checksum_after_arglist
, 16))
12399 fold_check_failed (NULL_TREE
, tem
);
12404 /* Perform constant folding and related simplification of initializer
12405 expression EXPR. These behave identically to "fold_buildN" but ignore
12406 potential run-time traps and exceptions that fold must preserve. */
12408 #define START_FOLD_INIT \
12409 int saved_signaling_nans = flag_signaling_nans;\
12410 int saved_trapping_math = flag_trapping_math;\
12411 int saved_rounding_math = flag_rounding_math;\
12412 int saved_trapv = flag_trapv;\
12413 int saved_folding_initializer = folding_initializer;\
12414 flag_signaling_nans = 0;\
12415 flag_trapping_math = 0;\
12416 flag_rounding_math = 0;\
12418 folding_initializer = 1;
12420 #define END_FOLD_INIT \
12421 flag_signaling_nans = saved_signaling_nans;\
12422 flag_trapping_math = saved_trapping_math;\
12423 flag_rounding_math = saved_rounding_math;\
12424 flag_trapv = saved_trapv;\
12425 folding_initializer = saved_folding_initializer;
12428 fold_build1_initializer_loc (location_t loc
, enum tree_code code
,
12429 tree type
, tree op
)
12434 result
= fold_build1_loc (loc
, code
, type
, op
);
12441 fold_build2_initializer_loc (location_t loc
, enum tree_code code
,
12442 tree type
, tree op0
, tree op1
)
12447 result
= fold_build2_loc (loc
, code
, type
, op0
, op1
);
12454 fold_build_call_array_initializer_loc (location_t loc
, tree type
, tree fn
,
12455 int nargs
, tree
*argarray
)
12460 result
= fold_build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
12466 #undef START_FOLD_INIT
12467 #undef END_FOLD_INIT
12469 /* Determine if first argument is a multiple of second argument. Return 0 if
12470 it is not, or we cannot easily determined it to be.
12472 An example of the sort of thing we care about (at this point; this routine
12473 could surely be made more general, and expanded to do what the *_DIV_EXPR's
12474 fold cases do now) is discovering that
12476 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
12482 when we know that the two SAVE_EXPR (J * 8) nodes are the same node.
12484 This code also handles discovering that
12486 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
12488 is a multiple of 8 so we don't have to worry about dealing with a
12489 possible remainder.
12491 Note that we *look* inside a SAVE_EXPR only to determine how it was
12492 calculated; it is not safe for fold to do much of anything else with the
12493 internals of a SAVE_EXPR, since it cannot know when it will be evaluated
12494 at run time. For example, the latter example above *cannot* be implemented
12495 as SAVE_EXPR (I) * J or any variant thereof, since the value of J at
12496 evaluation time of the original SAVE_EXPR is not necessarily the same at
12497 the time the new expression is evaluated. The only optimization of this
12498 sort that would be valid is changing
12500 SAVE_EXPR (I) * SAVE_EXPR (SAVE_EXPR (J) * 8)
12504 SAVE_EXPR (I) * SAVE_EXPR (J)
12506 (where the same SAVE_EXPR (J) is used in the original and the
12507 transformed version). */
12510 multiple_of_p (tree type
, const_tree top
, const_tree bottom
)
12515 if (operand_equal_p (top
, bottom
, 0))
12518 if (TREE_CODE (type
) != INTEGER_TYPE
)
12521 switch (TREE_CODE (top
))
12524 /* Bitwise and provides a power of two multiple. If the mask is
12525 a multiple of BOTTOM then TOP is a multiple of BOTTOM. */
12526 if (!integer_pow2p (bottom
))
12531 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
12532 || multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
12535 /* It is impossible to prove if op0 - op1 is multiple of bottom
12536 precisely, so be conservative here checking if both op0 and op1
12537 are multiple of bottom. Note we check the second operand first
12538 since it's usually simpler. */
12539 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
12540 && multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
12543 /* The same as MINUS_EXPR, but handle cases like op0 + 0xfffffffd
12544 as op0 - 3 if the expression has unsigned type. For example,
12545 (X / 3) + 0xfffffffd is multiple of 3, but 0xfffffffd is not. */
12546 op1
= TREE_OPERAND (top
, 1);
12547 if (TYPE_UNSIGNED (type
)
12548 && TREE_CODE (op1
) == INTEGER_CST
&& tree_int_cst_sign_bit (op1
))
12549 op1
= fold_build1 (NEGATE_EXPR
, type
, op1
);
12550 return (multiple_of_p (type
, op1
, bottom
)
12551 && multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
12554 if (TREE_CODE (TREE_OPERAND (top
, 1)) == INTEGER_CST
)
12556 op1
= TREE_OPERAND (top
, 1);
12557 /* const_binop may not detect overflow correctly,
12558 so check for it explicitly here. */
12559 if (wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)), op1
)
12560 && 0 != (t1
= fold_convert (type
,
12561 const_binop (LSHIFT_EXPR
,
12564 && !TREE_OVERFLOW (t1
))
12565 return multiple_of_p (type
, t1
, bottom
);
12570 /* Can't handle conversions from non-integral or wider integral type. */
12571 if ((TREE_CODE (TREE_TYPE (TREE_OPERAND (top
, 0))) != INTEGER_TYPE
)
12572 || (TYPE_PRECISION (type
)
12573 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (top
, 0)))))
12579 return multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
);
12582 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
12583 && multiple_of_p (type
, TREE_OPERAND (top
, 2), bottom
));
12586 if (TREE_CODE (bottom
) != INTEGER_CST
12587 || integer_zerop (bottom
)
12588 || (TYPE_UNSIGNED (type
)
12589 && (tree_int_cst_sgn (top
) < 0
12590 || tree_int_cst_sgn (bottom
) < 0)))
12592 return wi::multiple_of_p (wi::to_widest (top
), wi::to_widest (bottom
),
12596 if (TREE_CODE (bottom
) == INTEGER_CST
12597 && (stmt
= SSA_NAME_DEF_STMT (top
)) != NULL
12598 && gimple_code (stmt
) == GIMPLE_ASSIGN
)
12600 enum tree_code code
= gimple_assign_rhs_code (stmt
);
12602 /* Check for special cases to see if top is defined as multiple
12605 top = (X & ~(bottom - 1) ; bottom is power of 2
12611 if (code
== BIT_AND_EXPR
12612 && (op2
= gimple_assign_rhs2 (stmt
)) != NULL_TREE
12613 && TREE_CODE (op2
) == INTEGER_CST
12614 && integer_pow2p (bottom
)
12615 && wi::multiple_of_p (wi::to_widest (op2
),
12616 wi::to_widest (bottom
), UNSIGNED
))
12619 op1
= gimple_assign_rhs1 (stmt
);
12620 if (code
== MINUS_EXPR
12621 && (op2
= gimple_assign_rhs2 (stmt
)) != NULL_TREE
12622 && TREE_CODE (op2
) == SSA_NAME
12623 && (stmt
= SSA_NAME_DEF_STMT (op2
)) != NULL
12624 && gimple_code (stmt
) == GIMPLE_ASSIGN
12625 && (code
= gimple_assign_rhs_code (stmt
)) == TRUNC_MOD_EXPR
12626 && operand_equal_p (op1
, gimple_assign_rhs1 (stmt
), 0)
12627 && operand_equal_p (bottom
, gimple_assign_rhs2 (stmt
), 0))
12638 #define tree_expr_nonnegative_warnv_p(X, Y) \
12639 _Pragma ("GCC error \"Use RECURSE for recursive calls\"") 0
12641 #define RECURSE(X) \
12642 ((tree_expr_nonnegative_warnv_p) (X, strict_overflow_p, depth + 1))
12644 /* Return true if CODE or TYPE is known to be non-negative. */
12647 tree_simple_nonnegative_warnv_p (enum tree_code code
, tree type
)
12649 if ((TYPE_PRECISION (type
) != 1 || TYPE_UNSIGNED (type
))
12650 && truth_value_p (code
))
12651 /* Truth values evaluate to 0 or 1, which is nonnegative unless we
12652 have a signed:1 type (where the value is -1 and 0). */
12657 /* Return true if (CODE OP0) is known to be non-negative. If the return
12658 value is based on the assumption that signed overflow is undefined,
12659 set *STRICT_OVERFLOW_P to true; otherwise, don't change
12660 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
12663 tree_unary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
12664 bool *strict_overflow_p
, int depth
)
12666 if (TYPE_UNSIGNED (type
))
12672 /* We can't return 1 if flag_wrapv is set because
12673 ABS_EXPR<INT_MIN> = INT_MIN. */
12674 if (!ANY_INTEGRAL_TYPE_P (type
))
12676 if (TYPE_OVERFLOW_UNDEFINED (type
))
12678 *strict_overflow_p
= true;
12683 case NON_LVALUE_EXPR
:
12685 case FIX_TRUNC_EXPR
:
12686 return RECURSE (op0
);
12690 tree inner_type
= TREE_TYPE (op0
);
12691 tree outer_type
= type
;
12693 if (TREE_CODE (outer_type
) == REAL_TYPE
)
12695 if (TREE_CODE (inner_type
) == REAL_TYPE
)
12696 return RECURSE (op0
);
12697 if (INTEGRAL_TYPE_P (inner_type
))
12699 if (TYPE_UNSIGNED (inner_type
))
12701 return RECURSE (op0
);
12704 else if (INTEGRAL_TYPE_P (outer_type
))
12706 if (TREE_CODE (inner_type
) == REAL_TYPE
)
12707 return RECURSE (op0
);
12708 if (INTEGRAL_TYPE_P (inner_type
))
12709 return TYPE_PRECISION (inner_type
) < TYPE_PRECISION (outer_type
)
12710 && TYPE_UNSIGNED (inner_type
);
12716 return tree_simple_nonnegative_warnv_p (code
, type
);
12719 /* We don't know sign of `t', so be conservative and return false. */
12723 /* Return true if (CODE OP0 OP1) is known to be non-negative. If the return
12724 value is based on the assumption that signed overflow is undefined,
12725 set *STRICT_OVERFLOW_P to true; otherwise, don't change
12726 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
12729 tree_binary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
12730 tree op1
, bool *strict_overflow_p
,
12733 if (TYPE_UNSIGNED (type
))
12738 case POINTER_PLUS_EXPR
:
12740 if (FLOAT_TYPE_P (type
))
12741 return RECURSE (op0
) && RECURSE (op1
);
12743 /* zero_extend(x) + zero_extend(y) is non-negative if x and y are
12744 both unsigned and at least 2 bits shorter than the result. */
12745 if (TREE_CODE (type
) == INTEGER_TYPE
12746 && TREE_CODE (op0
) == NOP_EXPR
12747 && TREE_CODE (op1
) == NOP_EXPR
)
12749 tree inner1
= TREE_TYPE (TREE_OPERAND (op0
, 0));
12750 tree inner2
= TREE_TYPE (TREE_OPERAND (op1
, 0));
12751 if (TREE_CODE (inner1
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner1
)
12752 && TREE_CODE (inner2
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner2
))
12754 unsigned int prec
= MAX (TYPE_PRECISION (inner1
),
12755 TYPE_PRECISION (inner2
)) + 1;
12756 return prec
< TYPE_PRECISION (type
);
12762 if (FLOAT_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
12764 /* x * x is always non-negative for floating point x
12765 or without overflow. */
12766 if (operand_equal_p (op0
, op1
, 0)
12767 || (RECURSE (op0
) && RECURSE (op1
)))
12769 if (ANY_INTEGRAL_TYPE_P (type
)
12770 && TYPE_OVERFLOW_UNDEFINED (type
))
12771 *strict_overflow_p
= true;
12776 /* zero_extend(x) * zero_extend(y) is non-negative if x and y are
12777 both unsigned and their total bits is shorter than the result. */
12778 if (TREE_CODE (type
) == INTEGER_TYPE
12779 && (TREE_CODE (op0
) == NOP_EXPR
|| TREE_CODE (op0
) == INTEGER_CST
)
12780 && (TREE_CODE (op1
) == NOP_EXPR
|| TREE_CODE (op1
) == INTEGER_CST
))
12782 tree inner0
= (TREE_CODE (op0
) == NOP_EXPR
)
12783 ? TREE_TYPE (TREE_OPERAND (op0
, 0))
12785 tree inner1
= (TREE_CODE (op1
) == NOP_EXPR
)
12786 ? TREE_TYPE (TREE_OPERAND (op1
, 0))
12789 bool unsigned0
= TYPE_UNSIGNED (inner0
);
12790 bool unsigned1
= TYPE_UNSIGNED (inner1
);
12792 if (TREE_CODE (op0
) == INTEGER_CST
)
12793 unsigned0
= unsigned0
|| tree_int_cst_sgn (op0
) >= 0;
12795 if (TREE_CODE (op1
) == INTEGER_CST
)
12796 unsigned1
= unsigned1
|| tree_int_cst_sgn (op1
) >= 0;
12798 if (TREE_CODE (inner0
) == INTEGER_TYPE
&& unsigned0
12799 && TREE_CODE (inner1
) == INTEGER_TYPE
&& unsigned1
)
12801 unsigned int precision0
= (TREE_CODE (op0
) == INTEGER_CST
)
12802 ? tree_int_cst_min_precision (op0
, UNSIGNED
)
12803 : TYPE_PRECISION (inner0
);
12805 unsigned int precision1
= (TREE_CODE (op1
) == INTEGER_CST
)
12806 ? tree_int_cst_min_precision (op1
, UNSIGNED
)
12807 : TYPE_PRECISION (inner1
);
12809 return precision0
+ precision1
< TYPE_PRECISION (type
);
12816 return RECURSE (op0
) || RECURSE (op1
);
12822 case TRUNC_DIV_EXPR
:
12823 case CEIL_DIV_EXPR
:
12824 case FLOOR_DIV_EXPR
:
12825 case ROUND_DIV_EXPR
:
12826 return RECURSE (op0
) && RECURSE (op1
);
12828 case TRUNC_MOD_EXPR
:
12829 return RECURSE (op0
);
12831 case FLOOR_MOD_EXPR
:
12832 return RECURSE (op1
);
12834 case CEIL_MOD_EXPR
:
12835 case ROUND_MOD_EXPR
:
12837 return tree_simple_nonnegative_warnv_p (code
, type
);
12840 /* We don't know sign of `t', so be conservative and return false. */
12844 /* Return true if T is known to be non-negative. If the return
12845 value is based on the assumption that signed overflow is undefined,
12846 set *STRICT_OVERFLOW_P to true; otherwise, don't change
12847 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
12850 tree_single_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
12852 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
12855 switch (TREE_CODE (t
))
12858 return tree_int_cst_sgn (t
) >= 0;
12861 return ! REAL_VALUE_NEGATIVE (TREE_REAL_CST (t
));
12864 return ! FIXED_VALUE_NEGATIVE (TREE_FIXED_CST (t
));
12867 return RECURSE (TREE_OPERAND (t
, 1)) && RECURSE (TREE_OPERAND (t
, 2));
12870 /* Limit the depth of recursion to avoid quadratic behavior.
12871 This is expected to catch almost all occurrences in practice.
12872 If this code misses important cases that unbounded recursion
12873 would not, passes that need this information could be revised
12874 to provide it through dataflow propagation. */
12875 return (!name_registered_for_update_p (t
)
12876 && depth
< PARAM_VALUE (PARAM_MAX_SSA_NAME_QUERY_DEPTH
)
12877 && gimple_stmt_nonnegative_warnv_p (SSA_NAME_DEF_STMT (t
),
12878 strict_overflow_p
, depth
));
12881 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
), TREE_TYPE (t
));
12885 /* Return true if T is known to be non-negative. If the return
12886 value is based on the assumption that signed overflow is undefined,
12887 set *STRICT_OVERFLOW_P to true; otherwise, don't change
12888 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
12891 tree_call_nonnegative_warnv_p (tree type
, combined_fn fn
, tree arg0
, tree arg1
,
12892 bool *strict_overflow_p
, int depth
)
12913 case CFN_BUILT_IN_BSWAP32
:
12914 case CFN_BUILT_IN_BSWAP64
:
12919 /* sqrt(-0.0) is -0.0. */
12920 if (!HONOR_SIGNED_ZEROS (element_mode (type
)))
12922 return RECURSE (arg0
);
12948 CASE_CFN_NEARBYINT
:
12955 CASE_CFN_SIGNIFICAND
:
12959 /* True if the 1st argument is nonnegative. */
12960 return RECURSE (arg0
);
12963 /* True if the 1st OR 2nd arguments are nonnegative. */
12964 return RECURSE (arg0
) || RECURSE (arg1
);
12967 /* True if the 1st AND 2nd arguments are nonnegative. */
12968 return RECURSE (arg0
) && RECURSE (arg1
);
12971 /* True if the 2nd argument is nonnegative. */
12972 return RECURSE (arg1
);
12975 /* True if the 1st argument is nonnegative or the second
12976 argument is an even integer. */
12977 if (TREE_CODE (arg1
) == INTEGER_CST
12978 && (TREE_INT_CST_LOW (arg1
) & 1) == 0)
12980 return RECURSE (arg0
);
12983 /* True if the 1st argument is nonnegative or the second
12984 argument is an even integer valued real. */
12985 if (TREE_CODE (arg1
) == REAL_CST
)
12990 c
= TREE_REAL_CST (arg1
);
12991 n
= real_to_integer (&c
);
12994 REAL_VALUE_TYPE cint
;
12995 real_from_integer (&cint
, VOIDmode
, n
, SIGNED
);
12996 if (real_identical (&c
, &cint
))
13000 return RECURSE (arg0
);
13005 return tree_simple_nonnegative_warnv_p (CALL_EXPR
, type
);
13008 /* Return true if T is known to be non-negative. If the return
13009 value is based on the assumption that signed overflow is undefined,
13010 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13011 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13014 tree_invalid_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
13016 enum tree_code code
= TREE_CODE (t
);
13017 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
13024 tree temp
= TARGET_EXPR_SLOT (t
);
13025 t
= TARGET_EXPR_INITIAL (t
);
13027 /* If the initializer is non-void, then it's a normal expression
13028 that will be assigned to the slot. */
13029 if (!VOID_TYPE_P (t
))
13030 return RECURSE (t
);
13032 /* Otherwise, the initializer sets the slot in some way. One common
13033 way is an assignment statement at the end of the initializer. */
13036 if (TREE_CODE (t
) == BIND_EXPR
)
13037 t
= expr_last (BIND_EXPR_BODY (t
));
13038 else if (TREE_CODE (t
) == TRY_FINALLY_EXPR
13039 || TREE_CODE (t
) == TRY_CATCH_EXPR
)
13040 t
= expr_last (TREE_OPERAND (t
, 0));
13041 else if (TREE_CODE (t
) == STATEMENT_LIST
)
13046 if (TREE_CODE (t
) == MODIFY_EXPR
13047 && TREE_OPERAND (t
, 0) == temp
)
13048 return RECURSE (TREE_OPERAND (t
, 1));
13055 tree arg0
= call_expr_nargs (t
) > 0 ? CALL_EXPR_ARG (t
, 0) : NULL_TREE
;
13056 tree arg1
= call_expr_nargs (t
) > 1 ? CALL_EXPR_ARG (t
, 1) : NULL_TREE
;
13058 return tree_call_nonnegative_warnv_p (TREE_TYPE (t
),
13059 get_call_combined_fn (t
),
13062 strict_overflow_p
, depth
);
13064 case COMPOUND_EXPR
:
13066 return RECURSE (TREE_OPERAND (t
, 1));
13069 return RECURSE (expr_last (TREE_OPERAND (t
, 1)));
13072 return RECURSE (TREE_OPERAND (t
, 0));
13075 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
), TREE_TYPE (t
));
13080 #undef tree_expr_nonnegative_warnv_p
13082 /* Return true if T is known to be non-negative. If the return
13083 value is based on the assumption that signed overflow is undefined,
13084 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13085 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13088 tree_expr_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
13090 enum tree_code code
;
13091 if (t
== error_mark_node
)
13094 code
= TREE_CODE (t
);
13095 switch (TREE_CODE_CLASS (code
))
13098 case tcc_comparison
:
13099 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
13101 TREE_OPERAND (t
, 0),
13102 TREE_OPERAND (t
, 1),
13103 strict_overflow_p
, depth
);
13106 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
13108 TREE_OPERAND (t
, 0),
13109 strict_overflow_p
, depth
);
13112 case tcc_declaration
:
13113 case tcc_reference
:
13114 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
13122 case TRUTH_AND_EXPR
:
13123 case TRUTH_OR_EXPR
:
13124 case TRUTH_XOR_EXPR
:
13125 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
13127 TREE_OPERAND (t
, 0),
13128 TREE_OPERAND (t
, 1),
13129 strict_overflow_p
, depth
);
13130 case TRUTH_NOT_EXPR
:
13131 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
13133 TREE_OPERAND (t
, 0),
13134 strict_overflow_p
, depth
);
13141 case WITH_SIZE_EXPR
:
13143 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
13146 return tree_invalid_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
13150 /* Return true if `t' is known to be non-negative. Handle warnings
13151 about undefined signed overflow. */
13154 tree_expr_nonnegative_p (tree t
)
13156 bool ret
, strict_overflow_p
;
13158 strict_overflow_p
= false;
13159 ret
= tree_expr_nonnegative_warnv_p (t
, &strict_overflow_p
);
13160 if (strict_overflow_p
)
13161 fold_overflow_warning (("assuming signed overflow does not occur when "
13162 "determining that expression is always "
13164 WARN_STRICT_OVERFLOW_MISC
);
13169 /* Return true when (CODE OP0) is an address and is known to be nonzero.
13170 For floating point we further ensure that T is not denormal.
13171 Similar logic is present in nonzero_address in rtlanal.h.
13173 If the return value is based on the assumption that signed overflow
13174 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
13175 change *STRICT_OVERFLOW_P. */
13178 tree_unary_nonzero_warnv_p (enum tree_code code
, tree type
, tree op0
,
13179 bool *strict_overflow_p
)
13184 return tree_expr_nonzero_warnv_p (op0
,
13185 strict_overflow_p
);
13189 tree inner_type
= TREE_TYPE (op0
);
13190 tree outer_type
= type
;
13192 return (TYPE_PRECISION (outer_type
) >= TYPE_PRECISION (inner_type
)
13193 && tree_expr_nonzero_warnv_p (op0
,
13194 strict_overflow_p
));
13198 case NON_LVALUE_EXPR
:
13199 return tree_expr_nonzero_warnv_p (op0
,
13200 strict_overflow_p
);
13209 /* Return true when (CODE OP0 OP1) is an address and is known to be nonzero.
13210 For floating point we further ensure that T is not denormal.
13211 Similar logic is present in nonzero_address in rtlanal.h.
13213 If the return value is based on the assumption that signed overflow
13214 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
13215 change *STRICT_OVERFLOW_P. */
13218 tree_binary_nonzero_warnv_p (enum tree_code code
,
13221 tree op1
, bool *strict_overflow_p
)
13223 bool sub_strict_overflow_p
;
13226 case POINTER_PLUS_EXPR
:
13228 if (ANY_INTEGRAL_TYPE_P (type
) && TYPE_OVERFLOW_UNDEFINED (type
))
13230 /* With the presence of negative values it is hard
13231 to say something. */
13232 sub_strict_overflow_p
= false;
13233 if (!tree_expr_nonnegative_warnv_p (op0
,
13234 &sub_strict_overflow_p
)
13235 || !tree_expr_nonnegative_warnv_p (op1
,
13236 &sub_strict_overflow_p
))
13238 /* One of operands must be positive and the other non-negative. */
13239 /* We don't set *STRICT_OVERFLOW_P here: even if this value
13240 overflows, on a twos-complement machine the sum of two
13241 nonnegative numbers can never be zero. */
13242 return (tree_expr_nonzero_warnv_p (op0
,
13244 || tree_expr_nonzero_warnv_p (op1
,
13245 strict_overflow_p
));
13250 if (TYPE_OVERFLOW_UNDEFINED (type
))
13252 if (tree_expr_nonzero_warnv_p (op0
,
13254 && tree_expr_nonzero_warnv_p (op1
,
13255 strict_overflow_p
))
13257 *strict_overflow_p
= true;
13264 sub_strict_overflow_p
= false;
13265 if (tree_expr_nonzero_warnv_p (op0
,
13266 &sub_strict_overflow_p
)
13267 && tree_expr_nonzero_warnv_p (op1
,
13268 &sub_strict_overflow_p
))
13270 if (sub_strict_overflow_p
)
13271 *strict_overflow_p
= true;
13276 sub_strict_overflow_p
= false;
13277 if (tree_expr_nonzero_warnv_p (op0
,
13278 &sub_strict_overflow_p
))
13280 if (sub_strict_overflow_p
)
13281 *strict_overflow_p
= true;
13283 /* When both operands are nonzero, then MAX must be too. */
13284 if (tree_expr_nonzero_warnv_p (op1
,
13285 strict_overflow_p
))
13288 /* MAX where operand 0 is positive is positive. */
13289 return tree_expr_nonnegative_warnv_p (op0
,
13290 strict_overflow_p
);
13292 /* MAX where operand 1 is positive is positive. */
13293 else if (tree_expr_nonzero_warnv_p (op1
,
13294 &sub_strict_overflow_p
)
13295 && tree_expr_nonnegative_warnv_p (op1
,
13296 &sub_strict_overflow_p
))
13298 if (sub_strict_overflow_p
)
13299 *strict_overflow_p
= true;
13305 return (tree_expr_nonzero_warnv_p (op1
,
13307 || tree_expr_nonzero_warnv_p (op0
,
13308 strict_overflow_p
));
13317 /* Return true when T is an address and is known to be nonzero.
13318 For floating point we further ensure that T is not denormal.
13319 Similar logic is present in nonzero_address in rtlanal.h.
13321 If the return value is based on the assumption that signed overflow
13322 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
13323 change *STRICT_OVERFLOW_P. */
13326 tree_single_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
13328 bool sub_strict_overflow_p
;
13329 switch (TREE_CODE (t
))
13332 return !integer_zerop (t
);
13336 tree base
= TREE_OPERAND (t
, 0);
13338 if (!DECL_P (base
))
13339 base
= get_base_address (base
);
13341 if (base
&& TREE_CODE (base
) == TARGET_EXPR
)
13342 base
= TARGET_EXPR_SLOT (base
);
13347 /* For objects in symbol table check if we know they are non-zero.
13348 Don't do anything for variables and functions before symtab is built;
13349 it is quite possible that they will be declared weak later. */
13350 int nonzero_addr
= maybe_nonzero_address (base
);
13351 if (nonzero_addr
>= 0)
13352 return nonzero_addr
;
13354 /* Constants are never weak. */
13355 if (CONSTANT_CLASS_P (base
))
13362 sub_strict_overflow_p
= false;
13363 if (tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
13364 &sub_strict_overflow_p
)
13365 && tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 2),
13366 &sub_strict_overflow_p
))
13368 if (sub_strict_overflow_p
)
13369 *strict_overflow_p
= true;
13375 if (!INTEGRAL_TYPE_P (TREE_TYPE (t
)))
13377 return expr_not_equal_to (t
, wi::zero (TYPE_PRECISION (TREE_TYPE (t
))));
13385 #define integer_valued_real_p(X) \
13386 _Pragma ("GCC error \"Use RECURSE for recursive calls\"") 0
13388 #define RECURSE(X) \
13389 ((integer_valued_real_p) (X, depth + 1))
13391 /* Return true if the floating point result of (CODE OP0) has an
13392 integer value. We also allow +Inf, -Inf and NaN to be considered
13393 integer values. Return false for signaling NaN.
13395 DEPTH is the current nesting depth of the query. */
13398 integer_valued_real_unary_p (tree_code code
, tree op0
, int depth
)
13406 return RECURSE (op0
);
13410 tree type
= TREE_TYPE (op0
);
13411 if (TREE_CODE (type
) == INTEGER_TYPE
)
13413 if (TREE_CODE (type
) == REAL_TYPE
)
13414 return RECURSE (op0
);
13424 /* Return true if the floating point result of (CODE OP0 OP1) has an
13425 integer value. We also allow +Inf, -Inf and NaN to be considered
13426 integer values. Return false for signaling NaN.
13428 DEPTH is the current nesting depth of the query. */
13431 integer_valued_real_binary_p (tree_code code
, tree op0
, tree op1
, int depth
)
13440 return RECURSE (op0
) && RECURSE (op1
);
13448 /* Return true if the floating point result of calling FNDECL with arguments
13449 ARG0 and ARG1 has an integer value. We also allow +Inf, -Inf and NaN to be
13450 considered integer values. Return false for signaling NaN. If FNDECL
13451 takes fewer than 2 arguments, the remaining ARGn are null.
13453 DEPTH is the current nesting depth of the query. */
13456 integer_valued_real_call_p (combined_fn fn
, tree arg0
, tree arg1
, int depth
)
13462 CASE_CFN_NEARBYINT
:
13470 return RECURSE (arg0
) && RECURSE (arg1
);
13478 /* Return true if the floating point expression T (a GIMPLE_SINGLE_RHS)
13479 has an integer value. We also allow +Inf, -Inf and NaN to be
13480 considered integer values. Return false for signaling NaN.
13482 DEPTH is the current nesting depth of the query. */
13485 integer_valued_real_single_p (tree t
, int depth
)
13487 switch (TREE_CODE (t
))
13490 return real_isinteger (TREE_REAL_CST_PTR (t
), TYPE_MODE (TREE_TYPE (t
)));
13493 return RECURSE (TREE_OPERAND (t
, 1)) && RECURSE (TREE_OPERAND (t
, 2));
13496 /* Limit the depth of recursion to avoid quadratic behavior.
13497 This is expected to catch almost all occurrences in practice.
13498 If this code misses important cases that unbounded recursion
13499 would not, passes that need this information could be revised
13500 to provide it through dataflow propagation. */
13501 return (!name_registered_for_update_p (t
)
13502 && depth
< PARAM_VALUE (PARAM_MAX_SSA_NAME_QUERY_DEPTH
)
13503 && gimple_stmt_integer_valued_real_p (SSA_NAME_DEF_STMT (t
),
13512 /* Return true if the floating point expression T (a GIMPLE_INVALID_RHS)
13513 has an integer value. We also allow +Inf, -Inf and NaN to be
13514 considered integer values. Return false for signaling NaN.
13516 DEPTH is the current nesting depth of the query. */
13519 integer_valued_real_invalid_p (tree t
, int depth
)
13521 switch (TREE_CODE (t
))
13523 case COMPOUND_EXPR
:
13526 return RECURSE (TREE_OPERAND (t
, 1));
13529 return RECURSE (TREE_OPERAND (t
, 0));
13538 #undef integer_valued_real_p
13540 /* Return true if the floating point expression T has an integer value.
13541 We also allow +Inf, -Inf and NaN to be considered integer values.
13542 Return false for signaling NaN.
13544 DEPTH is the current nesting depth of the query. */
13547 integer_valued_real_p (tree t
, int depth
)
13549 if (t
== error_mark_node
)
13552 tree_code code
= TREE_CODE (t
);
13553 switch (TREE_CODE_CLASS (code
))
13556 case tcc_comparison
:
13557 return integer_valued_real_binary_p (code
, TREE_OPERAND (t
, 0),
13558 TREE_OPERAND (t
, 1), depth
);
13561 return integer_valued_real_unary_p (code
, TREE_OPERAND (t
, 0), depth
);
13564 case tcc_declaration
:
13565 case tcc_reference
:
13566 return integer_valued_real_single_p (t
, depth
);
13576 return integer_valued_real_single_p (t
, depth
);
13580 tree arg0
= (call_expr_nargs (t
) > 0
13581 ? CALL_EXPR_ARG (t
, 0)
13583 tree arg1
= (call_expr_nargs (t
) > 1
13584 ? CALL_EXPR_ARG (t
, 1)
13586 return integer_valued_real_call_p (get_call_combined_fn (t
),
13587 arg0
, arg1
, depth
);
13591 return integer_valued_real_invalid_p (t
, depth
);
13595 /* Given the components of a binary expression CODE, TYPE, OP0 and OP1,
13596 attempt to fold the expression to a constant without modifying TYPE,
13599 If the expression could be simplified to a constant, then return
13600 the constant. If the expression would not be simplified to a
13601 constant, then return NULL_TREE. */
13604 fold_binary_to_constant (enum tree_code code
, tree type
, tree op0
, tree op1
)
13606 tree tem
= fold_binary (code
, type
, op0
, op1
);
13607 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
13610 /* Given the components of a unary expression CODE, TYPE and OP0,
13611 attempt to fold the expression to a constant without modifying
13614 If the expression could be simplified to a constant, then return
13615 the constant. If the expression would not be simplified to a
13616 constant, then return NULL_TREE. */
13619 fold_unary_to_constant (enum tree_code code
, tree type
, tree op0
)
13621 tree tem
= fold_unary (code
, type
, op0
);
13622 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
13625 /* If EXP represents referencing an element in a constant string
13626 (either via pointer arithmetic or array indexing), return the
13627 tree representing the value accessed, otherwise return NULL. */
13630 fold_read_from_constant_string (tree exp
)
13632 if ((TREE_CODE (exp
) == INDIRECT_REF
13633 || TREE_CODE (exp
) == ARRAY_REF
)
13634 && TREE_CODE (TREE_TYPE (exp
)) == INTEGER_TYPE
)
13636 tree exp1
= TREE_OPERAND (exp
, 0);
13639 location_t loc
= EXPR_LOCATION (exp
);
13641 if (TREE_CODE (exp
) == INDIRECT_REF
)
13642 string
= string_constant (exp1
, &index
);
13645 tree low_bound
= array_ref_low_bound (exp
);
13646 index
= fold_convert_loc (loc
, sizetype
, TREE_OPERAND (exp
, 1));
13648 /* Optimize the special-case of a zero lower bound.
13650 We convert the low_bound to sizetype to avoid some problems
13651 with constant folding. (E.g. suppose the lower bound is 1,
13652 and its mode is QI. Without the conversion,l (ARRAY
13653 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
13654 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
13655 if (! integer_zerop (low_bound
))
13656 index
= size_diffop_loc (loc
, index
,
13657 fold_convert_loc (loc
, sizetype
, low_bound
));
13663 && TYPE_MODE (TREE_TYPE (exp
)) == TYPE_MODE (TREE_TYPE (TREE_TYPE (string
)))
13664 && TREE_CODE (string
) == STRING_CST
13665 && TREE_CODE (index
) == INTEGER_CST
13666 && compare_tree_int (index
, TREE_STRING_LENGTH (string
)) < 0
13667 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_TYPE (string
))))
13669 && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_TYPE (string
)))) == 1))
13670 return build_int_cst_type (TREE_TYPE (exp
),
13671 (TREE_STRING_POINTER (string
)
13672 [TREE_INT_CST_LOW (index
)]));
13677 /* Return the tree for neg (ARG0) when ARG0 is known to be either
13678 an integer constant, real, or fixed-point constant.
13680 TYPE is the type of the result. */
13683 fold_negate_const (tree arg0
, tree type
)
13685 tree t
= NULL_TREE
;
13687 switch (TREE_CODE (arg0
))
13692 wide_int val
= wi::neg (arg0
, &overflow
);
13693 t
= force_fit_type (type
, val
, 1,
13694 (overflow
| TREE_OVERFLOW (arg0
))
13695 && !TYPE_UNSIGNED (type
));
13700 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
13705 FIXED_VALUE_TYPE f
;
13706 bool overflow_p
= fixed_arithmetic (&f
, NEGATE_EXPR
,
13707 &(TREE_FIXED_CST (arg0
)), NULL
,
13708 TYPE_SATURATING (type
));
13709 t
= build_fixed (type
, f
);
13710 /* Propagate overflow flags. */
13711 if (overflow_p
| TREE_OVERFLOW (arg0
))
13712 TREE_OVERFLOW (t
) = 1;
13717 gcc_unreachable ();
13723 /* Return the tree for abs (ARG0) when ARG0 is known to be either
13724 an integer constant or real constant.
13726 TYPE is the type of the result. */
13729 fold_abs_const (tree arg0
, tree type
)
13731 tree t
= NULL_TREE
;
13733 switch (TREE_CODE (arg0
))
13737 /* If the value is unsigned or non-negative, then the absolute value
13738 is the same as the ordinary value. */
13739 if (!wi::neg_p (arg0
, TYPE_SIGN (type
)))
13742 /* If the value is negative, then the absolute value is
13747 wide_int val
= wi::neg (arg0
, &overflow
);
13748 t
= force_fit_type (type
, val
, -1,
13749 overflow
| TREE_OVERFLOW (arg0
));
13755 if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg0
)))
13756 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
13762 gcc_unreachable ();
13768 /* Return the tree for not (ARG0) when ARG0 is known to be an integer
13769 constant. TYPE is the type of the result. */
13772 fold_not_const (const_tree arg0
, tree type
)
13774 gcc_assert (TREE_CODE (arg0
) == INTEGER_CST
);
13776 return force_fit_type (type
, wi::bit_not (arg0
), 0, TREE_OVERFLOW (arg0
));
13779 /* Given CODE, a relational operator, the target type, TYPE and two
13780 constant operands OP0 and OP1, return the result of the
13781 relational operation. If the result is not a compile time
13782 constant, then return NULL_TREE. */
13785 fold_relational_const (enum tree_code code
, tree type
, tree op0
, tree op1
)
13787 int result
, invert
;
13789 /* From here on, the only cases we handle are when the result is
13790 known to be a constant. */
13792 if (TREE_CODE (op0
) == REAL_CST
&& TREE_CODE (op1
) == REAL_CST
)
13794 const REAL_VALUE_TYPE
*c0
= TREE_REAL_CST_PTR (op0
);
13795 const REAL_VALUE_TYPE
*c1
= TREE_REAL_CST_PTR (op1
);
13797 /* Handle the cases where either operand is a NaN. */
13798 if (real_isnan (c0
) || real_isnan (c1
))
13808 case UNORDERED_EXPR
:
13822 if (flag_trapping_math
)
13828 gcc_unreachable ();
13831 return constant_boolean_node (result
, type
);
13834 return constant_boolean_node (real_compare (code
, c0
, c1
), type
);
13837 if (TREE_CODE (op0
) == FIXED_CST
&& TREE_CODE (op1
) == FIXED_CST
)
13839 const FIXED_VALUE_TYPE
*c0
= TREE_FIXED_CST_PTR (op0
);
13840 const FIXED_VALUE_TYPE
*c1
= TREE_FIXED_CST_PTR (op1
);
13841 return constant_boolean_node (fixed_compare (code
, c0
, c1
), type
);
13844 /* Handle equality/inequality of complex constants. */
13845 if (TREE_CODE (op0
) == COMPLEX_CST
&& TREE_CODE (op1
) == COMPLEX_CST
)
13847 tree rcond
= fold_relational_const (code
, type
,
13848 TREE_REALPART (op0
),
13849 TREE_REALPART (op1
));
13850 tree icond
= fold_relational_const (code
, type
,
13851 TREE_IMAGPART (op0
),
13852 TREE_IMAGPART (op1
));
13853 if (code
== EQ_EXPR
)
13854 return fold_build2 (TRUTH_ANDIF_EXPR
, type
, rcond
, icond
);
13855 else if (code
== NE_EXPR
)
13856 return fold_build2 (TRUTH_ORIF_EXPR
, type
, rcond
, icond
);
13861 if (TREE_CODE (op0
) == VECTOR_CST
&& TREE_CODE (op1
) == VECTOR_CST
)
13863 if (!VECTOR_TYPE_P (type
))
13865 /* Have vector comparison with scalar boolean result. */
13866 gcc_assert ((code
== EQ_EXPR
|| code
== NE_EXPR
)
13867 && VECTOR_CST_NELTS (op0
) == VECTOR_CST_NELTS (op1
));
13868 for (unsigned i
= 0; i
< VECTOR_CST_NELTS (op0
); i
++)
13870 tree elem0
= VECTOR_CST_ELT (op0
, i
);
13871 tree elem1
= VECTOR_CST_ELT (op1
, i
);
13872 tree tmp
= fold_relational_const (code
, type
, elem0
, elem1
);
13873 if (tmp
== NULL_TREE
)
13875 if (integer_zerop (tmp
))
13876 return constant_boolean_node (false, type
);
13878 return constant_boolean_node (true, type
);
13880 unsigned count
= VECTOR_CST_NELTS (op0
);
13881 tree
*elts
= XALLOCAVEC (tree
, count
);
13882 gcc_assert (VECTOR_CST_NELTS (op1
) == count
13883 && TYPE_VECTOR_SUBPARTS (type
) == count
);
13885 for (unsigned i
= 0; i
< count
; i
++)
13887 tree elem_type
= TREE_TYPE (type
);
13888 tree elem0
= VECTOR_CST_ELT (op0
, i
);
13889 tree elem1
= VECTOR_CST_ELT (op1
, i
);
13891 tree tem
= fold_relational_const (code
, elem_type
,
13894 if (tem
== NULL_TREE
)
13897 elts
[i
] = build_int_cst (elem_type
, integer_zerop (tem
) ? 0 : -1);
13900 return build_vector (type
, elts
);
13903 /* From here on we only handle LT, LE, GT, GE, EQ and NE.
13905 To compute GT, swap the arguments and do LT.
13906 To compute GE, do LT and invert the result.
13907 To compute LE, swap the arguments, do LT and invert the result.
13908 To compute NE, do EQ and invert the result.
13910 Therefore, the code below must handle only EQ and LT. */
13912 if (code
== LE_EXPR
|| code
== GT_EXPR
)
13914 std::swap (op0
, op1
);
13915 code
= swap_tree_comparison (code
);
13918 /* Note that it is safe to invert for real values here because we
13919 have already handled the one case that it matters. */
13922 if (code
== NE_EXPR
|| code
== GE_EXPR
)
13925 code
= invert_tree_comparison (code
, false);
13928 /* Compute a result for LT or EQ if args permit;
13929 Otherwise return T. */
13930 if (TREE_CODE (op0
) == INTEGER_CST
&& TREE_CODE (op1
) == INTEGER_CST
)
13932 if (code
== EQ_EXPR
)
13933 result
= tree_int_cst_equal (op0
, op1
);
13935 result
= tree_int_cst_lt (op0
, op1
);
13942 return constant_boolean_node (result
, type
);
13945 /* If necessary, return a CLEANUP_POINT_EXPR for EXPR with the
13946 indicated TYPE. If no CLEANUP_POINT_EXPR is necessary, return EXPR
13950 fold_build_cleanup_point_expr (tree type
, tree expr
)
13952 /* If the expression does not have side effects then we don't have to wrap
13953 it with a cleanup point expression. */
13954 if (!TREE_SIDE_EFFECTS (expr
))
13957 /* If the expression is a return, check to see if the expression inside the
13958 return has no side effects or the right hand side of the modify expression
13959 inside the return. If either don't have side effects set we don't need to
13960 wrap the expression in a cleanup point expression. Note we don't check the
13961 left hand side of the modify because it should always be a return decl. */
13962 if (TREE_CODE (expr
) == RETURN_EXPR
)
13964 tree op
= TREE_OPERAND (expr
, 0);
13965 if (!op
|| !TREE_SIDE_EFFECTS (op
))
13967 op
= TREE_OPERAND (op
, 1);
13968 if (!TREE_SIDE_EFFECTS (op
))
13972 return build1_loc (EXPR_LOCATION (expr
), CLEANUP_POINT_EXPR
, type
, expr
);
13975 /* Given a pointer value OP0 and a type TYPE, return a simplified version
13976 of an indirection through OP0, or NULL_TREE if no simplification is
13980 fold_indirect_ref_1 (location_t loc
, tree type
, tree op0
)
13986 subtype
= TREE_TYPE (sub
);
13987 if (!POINTER_TYPE_P (subtype
)
13988 || TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (op0
)))
13991 if (TREE_CODE (sub
) == ADDR_EXPR
)
13993 tree op
= TREE_OPERAND (sub
, 0);
13994 tree optype
= TREE_TYPE (op
);
13995 /* *&CONST_DECL -> to the value of the const decl. */
13996 if (TREE_CODE (op
) == CONST_DECL
)
13997 return DECL_INITIAL (op
);
13998 /* *&p => p; make sure to handle *&"str"[cst] here. */
13999 if (type
== optype
)
14001 tree fop
= fold_read_from_constant_string (op
);
14007 /* *(foo *)&fooarray => fooarray[0] */
14008 else if (TREE_CODE (optype
) == ARRAY_TYPE
14009 && type
== TREE_TYPE (optype
)
14010 && (!in_gimple_form
14011 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
14013 tree type_domain
= TYPE_DOMAIN (optype
);
14014 tree min_val
= size_zero_node
;
14015 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
14016 min_val
= TYPE_MIN_VALUE (type_domain
);
14018 && TREE_CODE (min_val
) != INTEGER_CST
)
14020 return build4_loc (loc
, ARRAY_REF
, type
, op
, min_val
,
14021 NULL_TREE
, NULL_TREE
);
14023 /* *(foo *)&complexfoo => __real__ complexfoo */
14024 else if (TREE_CODE (optype
) == COMPLEX_TYPE
14025 && type
== TREE_TYPE (optype
))
14026 return fold_build1_loc (loc
, REALPART_EXPR
, type
, op
);
14027 /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */
14028 else if (TREE_CODE (optype
) == VECTOR_TYPE
14029 && type
== TREE_TYPE (optype
))
14031 tree part_width
= TYPE_SIZE (type
);
14032 tree index
= bitsize_int (0);
14033 return fold_build3_loc (loc
, BIT_FIELD_REF
, type
, op
, part_width
, index
);
14037 if (TREE_CODE (sub
) == POINTER_PLUS_EXPR
14038 && TREE_CODE (TREE_OPERAND (sub
, 1)) == INTEGER_CST
)
14040 tree op00
= TREE_OPERAND (sub
, 0);
14041 tree op01
= TREE_OPERAND (sub
, 1);
14044 if (TREE_CODE (op00
) == ADDR_EXPR
)
14047 op00
= TREE_OPERAND (op00
, 0);
14048 op00type
= TREE_TYPE (op00
);
14050 /* ((foo*)&vectorfoo)[1] => BIT_FIELD_REF<vectorfoo,...> */
14051 if (TREE_CODE (op00type
) == VECTOR_TYPE
14052 && type
== TREE_TYPE (op00type
))
14054 tree part_width
= TYPE_SIZE (type
);
14055 unsigned HOST_WIDE_INT max_offset
14056 = (tree_to_uhwi (part_width
) / BITS_PER_UNIT
14057 * TYPE_VECTOR_SUBPARTS (op00type
));
14058 if (tree_int_cst_sign_bit (op01
) == 0
14059 && compare_tree_int (op01
, max_offset
) == -1)
14061 unsigned HOST_WIDE_INT offset
= tree_to_uhwi (op01
);
14062 unsigned HOST_WIDE_INT indexi
= offset
* BITS_PER_UNIT
;
14063 tree index
= bitsize_int (indexi
);
14064 return fold_build3_loc (loc
,
14065 BIT_FIELD_REF
, type
, op00
,
14066 part_width
, index
);
14069 /* ((foo*)&complexfoo)[1] => __imag__ complexfoo */
14070 else if (TREE_CODE (op00type
) == COMPLEX_TYPE
14071 && type
== TREE_TYPE (op00type
))
14073 tree size
= TYPE_SIZE_UNIT (type
);
14074 if (tree_int_cst_equal (size
, op01
))
14075 return fold_build1_loc (loc
, IMAGPART_EXPR
, type
, op00
);
14077 /* ((foo *)&fooarray)[1] => fooarray[1] */
14078 else if (TREE_CODE (op00type
) == ARRAY_TYPE
14079 && type
== TREE_TYPE (op00type
))
14081 tree type_domain
= TYPE_DOMAIN (op00type
);
14082 tree min_val
= size_zero_node
;
14083 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
14084 min_val
= TYPE_MIN_VALUE (type_domain
);
14085 op01
= size_binop_loc (loc
, EXACT_DIV_EXPR
, op01
,
14086 TYPE_SIZE_UNIT (type
));
14087 op01
= size_binop_loc (loc
, PLUS_EXPR
, op01
, min_val
);
14088 return build4_loc (loc
, ARRAY_REF
, type
, op00
, op01
,
14089 NULL_TREE
, NULL_TREE
);
14094 /* *(foo *)fooarrptr => (*fooarrptr)[0] */
14095 if (TREE_CODE (TREE_TYPE (subtype
)) == ARRAY_TYPE
14096 && type
== TREE_TYPE (TREE_TYPE (subtype
))
14097 && (!in_gimple_form
14098 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
14101 tree min_val
= size_zero_node
;
14102 sub
= build_fold_indirect_ref_loc (loc
, sub
);
14103 type_domain
= TYPE_DOMAIN (TREE_TYPE (sub
));
14104 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
14105 min_val
= TYPE_MIN_VALUE (type_domain
);
14107 && TREE_CODE (min_val
) != INTEGER_CST
)
14109 return build4_loc (loc
, ARRAY_REF
, type
, sub
, min_val
, NULL_TREE
,
14116 /* Builds an expression for an indirection through T, simplifying some
14120 build_fold_indirect_ref_loc (location_t loc
, tree t
)
14122 tree type
= TREE_TYPE (TREE_TYPE (t
));
14123 tree sub
= fold_indirect_ref_1 (loc
, type
, t
);
14128 return build1_loc (loc
, INDIRECT_REF
, type
, t
);
14131 /* Given an INDIRECT_REF T, return either T or a simplified version. */
14134 fold_indirect_ref_loc (location_t loc
, tree t
)
14136 tree sub
= fold_indirect_ref_1 (loc
, TREE_TYPE (t
), TREE_OPERAND (t
, 0));
14144 /* Strip non-trapping, non-side-effecting tree nodes from an expression
14145 whose result is ignored. The type of the returned tree need not be
14146 the same as the original expression. */
14149 fold_ignored_result (tree t
)
14151 if (!TREE_SIDE_EFFECTS (t
))
14152 return integer_zero_node
;
14155 switch (TREE_CODE_CLASS (TREE_CODE (t
)))
14158 t
= TREE_OPERAND (t
, 0);
14162 case tcc_comparison
:
14163 if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
14164 t
= TREE_OPERAND (t
, 0);
14165 else if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 0)))
14166 t
= TREE_OPERAND (t
, 1);
14171 case tcc_expression
:
14172 switch (TREE_CODE (t
))
14174 case COMPOUND_EXPR
:
14175 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
14177 t
= TREE_OPERAND (t
, 0);
14181 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1))
14182 || TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 2)))
14184 t
= TREE_OPERAND (t
, 0);
14197 /* Return the value of VALUE, rounded up to a multiple of DIVISOR. */
14200 round_up_loc (location_t loc
, tree value
, unsigned int divisor
)
14202 tree div
= NULL_TREE
;
14207 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
14208 have to do anything. Only do this when we are not given a const,
14209 because in that case, this check is more expensive than just
14211 if (TREE_CODE (value
) != INTEGER_CST
)
14213 div
= build_int_cst (TREE_TYPE (value
), divisor
);
14215 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
14219 /* If divisor is a power of two, simplify this to bit manipulation. */
14220 if (pow2_or_zerop (divisor
))
14222 if (TREE_CODE (value
) == INTEGER_CST
)
14224 wide_int val
= value
;
14227 if ((val
& (divisor
- 1)) == 0)
14230 overflow_p
= TREE_OVERFLOW (value
);
14231 val
+= divisor
- 1;
14232 val
&= (int) -divisor
;
14236 return force_fit_type (TREE_TYPE (value
), val
, -1, overflow_p
);
14242 t
= build_int_cst (TREE_TYPE (value
), divisor
- 1);
14243 value
= size_binop_loc (loc
, PLUS_EXPR
, value
, t
);
14244 t
= build_int_cst (TREE_TYPE (value
), - (int) divisor
);
14245 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
14251 div
= build_int_cst (TREE_TYPE (value
), divisor
);
14252 value
= size_binop_loc (loc
, CEIL_DIV_EXPR
, value
, div
);
14253 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
14259 /* Likewise, but round down. */
14262 round_down_loc (location_t loc
, tree value
, int divisor
)
14264 tree div
= NULL_TREE
;
14266 gcc_assert (divisor
> 0);
14270 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
14271 have to do anything. Only do this when we are not given a const,
14272 because in that case, this check is more expensive than just
14274 if (TREE_CODE (value
) != INTEGER_CST
)
14276 div
= build_int_cst (TREE_TYPE (value
), divisor
);
14278 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
14282 /* If divisor is a power of two, simplify this to bit manipulation. */
14283 if (pow2_or_zerop (divisor
))
14287 t
= build_int_cst (TREE_TYPE (value
), -divisor
);
14288 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
14293 div
= build_int_cst (TREE_TYPE (value
), divisor
);
14294 value
= size_binop_loc (loc
, FLOOR_DIV_EXPR
, value
, div
);
14295 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
14301 /* Returns the pointer to the base of the object addressed by EXP and
14302 extracts the information about the offset of the access, storing it
14303 to PBITPOS and POFFSET. */
14306 split_address_to_core_and_offset (tree exp
,
14307 HOST_WIDE_INT
*pbitpos
, tree
*poffset
)
14311 int unsignedp
, reversep
, volatilep
;
14312 HOST_WIDE_INT bitsize
;
14313 location_t loc
= EXPR_LOCATION (exp
);
14315 if (TREE_CODE (exp
) == ADDR_EXPR
)
14317 core
= get_inner_reference (TREE_OPERAND (exp
, 0), &bitsize
, pbitpos
,
14318 poffset
, &mode
, &unsignedp
, &reversep
,
14320 core
= build_fold_addr_expr_loc (loc
, core
);
14322 else if (TREE_CODE (exp
) == POINTER_PLUS_EXPR
)
14324 core
= TREE_OPERAND (exp
, 0);
14327 *poffset
= TREE_OPERAND (exp
, 1);
14328 if (TREE_CODE (*poffset
) == INTEGER_CST
)
14330 offset_int tem
= wi::sext (wi::to_offset (*poffset
),
14331 TYPE_PRECISION (TREE_TYPE (*poffset
)));
14332 tem
<<= LOG2_BITS_PER_UNIT
;
14333 if (wi::fits_shwi_p (tem
))
14335 *pbitpos
= tem
.to_shwi ();
14336 *poffset
= NULL_TREE
;
14344 *poffset
= NULL_TREE
;
14350 /* Returns true if addresses of E1 and E2 differ by a constant, false
14351 otherwise. If they do, E1 - E2 is stored in *DIFF. */
14354 ptr_difference_const (tree e1
, tree e2
, HOST_WIDE_INT
*diff
)
14357 HOST_WIDE_INT bitpos1
, bitpos2
;
14358 tree toffset1
, toffset2
, tdiff
, type
;
14360 core1
= split_address_to_core_and_offset (e1
, &bitpos1
, &toffset1
);
14361 core2
= split_address_to_core_and_offset (e2
, &bitpos2
, &toffset2
);
14363 if (bitpos1
% BITS_PER_UNIT
!= 0
14364 || bitpos2
% BITS_PER_UNIT
!= 0
14365 || !operand_equal_p (core1
, core2
, 0))
14368 if (toffset1
&& toffset2
)
14370 type
= TREE_TYPE (toffset1
);
14371 if (type
!= TREE_TYPE (toffset2
))
14372 toffset2
= fold_convert (type
, toffset2
);
14374 tdiff
= fold_build2 (MINUS_EXPR
, type
, toffset1
, toffset2
);
14375 if (!cst_and_fits_in_hwi (tdiff
))
14378 *diff
= int_cst_value (tdiff
);
14380 else if (toffset1
|| toffset2
)
14382 /* If only one of the offsets is non-constant, the difference cannot
14389 *diff
+= (bitpos1
- bitpos2
) / BITS_PER_UNIT
;
14393 /* Return OFF converted to a pointer offset type suitable as offset for
14394 POINTER_PLUS_EXPR. Use location LOC for this conversion. */
14396 convert_to_ptrofftype_loc (location_t loc
, tree off
)
14398 return fold_convert_loc (loc
, sizetype
, off
);
14401 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
14403 fold_build_pointer_plus_loc (location_t loc
, tree ptr
, tree off
)
14405 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
14406 ptr
, convert_to_ptrofftype_loc (loc
, off
));
14409 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
14411 fold_build_pointer_plus_hwi_loc (location_t loc
, tree ptr
, HOST_WIDE_INT off
)
14413 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
14414 ptr
, size_int (off
));
14417 /* Return a char pointer for a C string if it is a string constant
14418 or sum of string constant and integer constant. We only support
14419 string constants properly terminated with '\0' character.
14420 If STRLEN is a valid pointer, length (including terminating character)
14421 of returned string is stored to the argument. */
14424 c_getstr (tree src
, unsigned HOST_WIDE_INT
*strlen
)
14431 src
= string_constant (src
, &offset_node
);
14435 unsigned HOST_WIDE_INT offset
= 0;
14436 if (offset_node
!= NULL_TREE
)
14438 if (!tree_fits_uhwi_p (offset_node
))
14441 offset
= tree_to_uhwi (offset_node
);
14444 unsigned HOST_WIDE_INT string_length
= TREE_STRING_LENGTH (src
);
14445 const char *string
= TREE_STRING_POINTER (src
);
14447 /* Support only properly null-terminated strings. */
14448 if (string_length
== 0
14449 || string
[string_length
- 1] != '\0'
14450 || offset
>= string_length
)
14454 *strlen
= string_length
- offset
;
14455 return string
+ offset
;
14460 namespace selftest
{
14462 /* Helper functions for writing tests of folding trees. */
14464 /* Verify that the binary op (LHS CODE RHS) folds to CONSTANT. */
14467 assert_binop_folds_to_const (tree lhs
, enum tree_code code
, tree rhs
,
14470 ASSERT_EQ (constant
, fold_build2 (code
, TREE_TYPE (lhs
), lhs
, rhs
));
14473 /* Verify that the binary op (LHS CODE RHS) folds to an NON_LVALUE_EXPR
14474 wrapping WRAPPED_EXPR. */
14477 assert_binop_folds_to_nonlvalue (tree lhs
, enum tree_code code
, tree rhs
,
14480 tree result
= fold_build2 (code
, TREE_TYPE (lhs
), lhs
, rhs
);
14481 ASSERT_NE (wrapped_expr
, result
);
14482 ASSERT_EQ (NON_LVALUE_EXPR
, TREE_CODE (result
));
14483 ASSERT_EQ (wrapped_expr
, TREE_OPERAND (result
, 0));
14486 /* Verify that various arithmetic binary operations are folded
14490 test_arithmetic_folding ()
14492 tree type
= integer_type_node
;
14493 tree x
= create_tmp_var_raw (type
, "x");
14494 tree zero
= build_zero_cst (type
);
14495 tree one
= build_int_cst (type
, 1);
14498 /* 1 <-- (0 + 1) */
14499 assert_binop_folds_to_const (zero
, PLUS_EXPR
, one
,
14501 assert_binop_folds_to_const (one
, PLUS_EXPR
, zero
,
14504 /* (nonlvalue)x <-- (x + 0) */
14505 assert_binop_folds_to_nonlvalue (x
, PLUS_EXPR
, zero
,
14509 /* 0 <-- (x - x) */
14510 assert_binop_folds_to_const (x
, MINUS_EXPR
, x
,
14512 assert_binop_folds_to_nonlvalue (x
, MINUS_EXPR
, zero
,
14515 /* Multiplication. */
14516 /* 0 <-- (x * 0) */
14517 assert_binop_folds_to_const (x
, MULT_EXPR
, zero
,
14520 /* (nonlvalue)x <-- (x * 1) */
14521 assert_binop_folds_to_nonlvalue (x
, MULT_EXPR
, one
,
14525 /* Verify that various binary operations on vectors are folded
14529 test_vector_folding ()
14531 tree inner_type
= integer_type_node
;
14532 tree type
= build_vector_type (inner_type
, 4);
14533 tree zero
= build_zero_cst (type
);
14534 tree one
= build_one_cst (type
);
14536 /* Verify equality tests that return a scalar boolean result. */
14537 tree res_type
= boolean_type_node
;
14538 ASSERT_FALSE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
, zero
, one
)));
14539 ASSERT_TRUE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
, zero
, zero
)));
14540 ASSERT_TRUE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, zero
, one
)));
14541 ASSERT_FALSE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, one
, one
)));
14544 /* Run all of the selftests within this file. */
14547 fold_const_c_tests ()
14549 test_arithmetic_folding ();
14550 test_vector_folding ();
14553 } // namespace selftest
14555 #endif /* CHECKING_P */