1 /* Match-and-simplify patterns for shared GENERIC and GIMPLE folding.
2 This file is consumed by genmatch which produces gimple-match.cc
3 and generic-match.cc from it.
5 Copyright (C) 2014-2024 Free Software Foundation, Inc.
6 Contributed by Richard Biener <rguenther@suse.de>
7 and Prathamesh Kulkarni <bilbotheelffriend@gmail.com>
9 This file is part of GCC.
11 GCC is free software; you can redistribute it and/or modify it under
12 the terms of the GNU General Public License as published by the Free
13 Software Foundation; either version 3, or (at your option) any later
16 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
17 WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
22 along with GCC; see the file COPYING3. If not see
23 <http://www.gnu.org/licenses/>. */
26 /* Generic tree predicates we inherit. */
28 integer_onep integer_zerop integer_all_onesp integer_minus_onep
29 integer_each_onep integer_truep integer_nonzerop
30 real_zerop real_onep real_minus_onep
32 initializer_each_zero_or_onep
34 tree_expr_nonnegative_p
42 bitmask_inv_cst_vector_p)
45 (define_operator_list tcc_comparison
46 lt le eq ne ge gt unordered ordered unlt unle ungt unge uneq ltgt)
47 (define_operator_list inverted_tcc_comparison
48 ge gt ne eq lt le ordered unordered ge gt le lt ltgt uneq)
49 (define_operator_list inverted_tcc_comparison_with_nans
50 unge ungt ne eq unlt unle ordered unordered ge gt le lt ltgt uneq)
51 (define_operator_list swapped_tcc_comparison
52 gt ge eq ne le lt unordered ordered ungt unge unlt unle uneq ltgt)
53 (define_operator_list simple_comparison lt le eq ne ge gt)
54 (define_operator_list swapped_simple_comparison gt ge eq ne le lt)
55 (define_operator_list BSWAP BUILT_IN_BSWAP16 BUILT_IN_BSWAP32
56 BUILT_IN_BSWAP64 BUILT_IN_BSWAP128)
58 #include "cfn-operators.pd"
60 /* Define operand lists for math rounding functions {,i,l,ll}FN,
61 where the versions prefixed with "i" return an int, those prefixed with
62 "l" return a long and those prefixed with "ll" return a long long.
64 Also define operand lists:
66 X<FN>F for all float functions, in the order i, l, ll
67 X<FN> for all double functions, in the same order
68 X<FN>L for all long double functions, in the same order. */
69 #define DEFINE_INT_AND_FLOAT_ROUND_FN(FN) \
70 (define_operator_list X##FN##F BUILT_IN_I##FN##F \
73 (define_operator_list X##FN BUILT_IN_I##FN \
76 (define_operator_list X##FN##L BUILT_IN_I##FN##L \
80 DEFINE_INT_AND_FLOAT_ROUND_FN (FLOOR)
81 DEFINE_INT_AND_FLOAT_ROUND_FN (CEIL)
82 DEFINE_INT_AND_FLOAT_ROUND_FN (ROUND)
83 DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
85 /* Unary operations and their associated IFN_COND_* function. */
86 (define_operator_list UNCOND_UNARY
88 (define_operator_list COND_UNARY
89 IFN_COND_NEG IFN_COND_NOT)
90 (define_operator_list COND_LEN_UNARY
91 IFN_COND_LEN_NEG IFN_COND_LEN_NOT)
93 /* Binary operations and their associated IFN_COND_* function. */
94 (define_operator_list UNCOND_BINARY
96 mult trunc_div trunc_mod rdiv
98 IFN_FMIN IFN_FMAX IFN_COPYSIGN
99 bit_and bit_ior bit_xor
101 (define_operator_list COND_BINARY
102 IFN_COND_ADD IFN_COND_SUB
103 IFN_COND_MUL IFN_COND_DIV IFN_COND_MOD IFN_COND_RDIV
104 IFN_COND_MIN IFN_COND_MAX
105 IFN_COND_FMIN IFN_COND_FMAX IFN_COND_COPYSIGN
106 IFN_COND_AND IFN_COND_IOR IFN_COND_XOR
107 IFN_COND_SHL IFN_COND_SHR)
108 (define_operator_list COND_LEN_BINARY
109 IFN_COND_LEN_ADD IFN_COND_LEN_SUB
110 IFN_COND_LEN_MUL IFN_COND_LEN_DIV
111 IFN_COND_LEN_MOD IFN_COND_LEN_RDIV
112 IFN_COND_LEN_MIN IFN_COND_LEN_MAX
113 IFN_COND_LEN_FMIN IFN_COND_LEN_FMAX IFN_COND_LEN_COPYSIGN
114 IFN_COND_LEN_AND IFN_COND_LEN_IOR IFN_COND_LEN_XOR
115 IFN_COND_LEN_SHL IFN_COND_LEN_SHR)
117 /* Same for ternary operations. */
118 (define_operator_list UNCOND_TERNARY
119 IFN_FMA IFN_FMS IFN_FNMA IFN_FNMS)
120 (define_operator_list COND_TERNARY
121 IFN_COND_FMA IFN_COND_FMS IFN_COND_FNMA IFN_COND_FNMS)
122 (define_operator_list COND_LEN_TERNARY
123 IFN_COND_LEN_FMA IFN_COND_LEN_FMS IFN_COND_LEN_FNMA IFN_COND_LEN_FNMS)
125 /* __atomic_fetch_or_*, __atomic_fetch_xor_*, __atomic_xor_fetch_* */
126 (define_operator_list ATOMIC_FETCH_OR_XOR_N
127 BUILT_IN_ATOMIC_FETCH_OR_1 BUILT_IN_ATOMIC_FETCH_OR_2
128 BUILT_IN_ATOMIC_FETCH_OR_4 BUILT_IN_ATOMIC_FETCH_OR_8
129 BUILT_IN_ATOMIC_FETCH_OR_16
130 BUILT_IN_ATOMIC_FETCH_XOR_1 BUILT_IN_ATOMIC_FETCH_XOR_2
131 BUILT_IN_ATOMIC_FETCH_XOR_4 BUILT_IN_ATOMIC_FETCH_XOR_8
132 BUILT_IN_ATOMIC_FETCH_XOR_16
133 BUILT_IN_ATOMIC_XOR_FETCH_1 BUILT_IN_ATOMIC_XOR_FETCH_2
134 BUILT_IN_ATOMIC_XOR_FETCH_4 BUILT_IN_ATOMIC_XOR_FETCH_8
135 BUILT_IN_ATOMIC_XOR_FETCH_16)
136 /* __sync_fetch_and_or_*, __sync_fetch_and_xor_*, __sync_xor_and_fetch_* */
137 (define_operator_list SYNC_FETCH_OR_XOR_N
138 BUILT_IN_SYNC_FETCH_AND_OR_1 BUILT_IN_SYNC_FETCH_AND_OR_2
139 BUILT_IN_SYNC_FETCH_AND_OR_4 BUILT_IN_SYNC_FETCH_AND_OR_8
140 BUILT_IN_SYNC_FETCH_AND_OR_16
141 BUILT_IN_SYNC_FETCH_AND_XOR_1 BUILT_IN_SYNC_FETCH_AND_XOR_2
142 BUILT_IN_SYNC_FETCH_AND_XOR_4 BUILT_IN_SYNC_FETCH_AND_XOR_8
143 BUILT_IN_SYNC_FETCH_AND_XOR_16
144 BUILT_IN_SYNC_XOR_AND_FETCH_1 BUILT_IN_SYNC_XOR_AND_FETCH_2
145 BUILT_IN_SYNC_XOR_AND_FETCH_4 BUILT_IN_SYNC_XOR_AND_FETCH_8
146 BUILT_IN_SYNC_XOR_AND_FETCH_16)
147 /* __atomic_fetch_and_*. */
148 (define_operator_list ATOMIC_FETCH_AND_N
149 BUILT_IN_ATOMIC_FETCH_AND_1 BUILT_IN_ATOMIC_FETCH_AND_2
150 BUILT_IN_ATOMIC_FETCH_AND_4 BUILT_IN_ATOMIC_FETCH_AND_8
151 BUILT_IN_ATOMIC_FETCH_AND_16)
152 /* __sync_fetch_and_and_*. */
153 (define_operator_list SYNC_FETCH_AND_AND_N
154 BUILT_IN_SYNC_FETCH_AND_AND_1 BUILT_IN_SYNC_FETCH_AND_AND_2
155 BUILT_IN_SYNC_FETCH_AND_AND_4 BUILT_IN_SYNC_FETCH_AND_AND_8
156 BUILT_IN_SYNC_FETCH_AND_AND_16)
158 /* With nop_convert? combine convert? and view_convert? in one pattern
159 plus conditionalize on tree_nop_conversion_p conversions. */
160 (match (nop_convert @0)
162 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))))
163 (match (nop_convert @0)
165 (if (VECTOR_TYPE_P (type) && VECTOR_TYPE_P (TREE_TYPE (@0))
166 && known_eq (TYPE_VECTOR_SUBPARTS (type),
167 TYPE_VECTOR_SUBPARTS (TREE_TYPE (@0)))
168 && tree_nop_conversion_p (TREE_TYPE (type), TREE_TYPE (TREE_TYPE (@0))))))
171 /* These are used by gimple_bitwise_inverted_equal_p to simplify
172 detection of BIT_NOT and comparisons. */
173 (match (bit_not_with_nop @0)
175 (match (bit_not_with_nop @0)
176 (convert (bit_not @0))
177 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))))
178 (for cmp (tcc_comparison)
179 (match (maybe_cmp @0)
181 (match (maybe_cmp @0)
182 (convert (cmp@0 @1 @2))
183 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))))
185 /* `a ^ b` is another form of `a != b` when the type
186 is a 1bit precission integer. */
187 (match (maybe_cmp @0)
189 (if (INTEGRAL_TYPE_P (type)
190 && TYPE_PRECISION (type) == 1)))
193 /* Transform likes of (char) ABS_EXPR <(int) x> into (char) ABSU_EXPR <x>
194 ABSU_EXPR returns unsigned absolute value of the operand and the operand
195 of the ABSU_EXPR will have the corresponding signed type. */
196 (simplify (abs (convert @0))
197 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
198 && !TYPE_UNSIGNED (TREE_TYPE (@0))
199 && element_precision (type) > element_precision (TREE_TYPE (@0)))
200 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
201 (convert (absu:utype @0)))))
204 /* Optimize (X + (X >> (prec - 1))) ^ (X >> (prec - 1)) into abs (X). */
206 (bit_xor:c (plus:c @0 (rshift@2 @0 INTEGER_CST@1)) @2)
207 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
208 && !TYPE_UNSIGNED (TREE_TYPE (@0))
209 && wi::to_widest (@1) == element_precision (TREE_TYPE (@0)) - 1)
213 /* Simplifications of operations with one constant operand and
214 simplifications to constants or single values. */
216 (for op (plus pointer_plus minus bit_ior bit_xor)
218 (op @0 integer_zerop)
221 /* 0 +p index -> (type)index */
223 (pointer_plus integer_zerop @1)
224 (non_lvalue (convert @1)))
226 /* ptr - 0 -> (type)ptr */
228 (pointer_diff @0 integer_zerop)
231 /* See if ARG1 is zero and X + ARG1 reduces to X.
232 Likewise if the operands are reversed. */
234 (plus:c @0 real_zerop@1)
235 (if (fold_real_zero_addition_p (type, @0, @1, 0))
238 /* See if ARG1 is zero and X - ARG1 reduces to X. */
240 (minus @0 real_zerop@1)
241 (if (fold_real_zero_addition_p (type, @0, @1, 1))
244 /* Even if the fold_real_zero_addition_p can't simplify X + 0.0
245 into X, we can optimize (X + 0.0) + 0.0 or (X + 0.0) - 0.0
246 or (X - 0.0) + 0.0 into X + 0.0 and (X - 0.0) - 0.0 into X - 0.0
247 if not -frounding-math. For sNaNs the first operation would raise
248 exceptions but turn the result into qNan, so the second operation
249 would not raise it. */
250 (for inner_op (plus minus)
251 (for outer_op (plus minus)
253 (outer_op (inner_op@3 @0 REAL_CST@1) REAL_CST@2)
256 && !HONOR_SIGN_DEPENDENT_ROUNDING (type))
257 (with { bool inner_plus = ((inner_op == PLUS_EXPR)
258 ^ REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (@1)));
260 = ((outer_op == PLUS_EXPR)
261 ^ REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (@2))); }
262 (if (outer_plus && !inner_plus)
267 This is unsafe for certain floats even in non-IEEE formats.
268 In IEEE, it is unsafe because it does wrong for NaNs.
269 PR middle-end/98420: x - x may be -0.0 with FE_DOWNWARD.
270 Also note that operand_equal_p is always false if an operand
274 (if (!FLOAT_TYPE_P (type)
275 || (!tree_expr_maybe_nan_p (@0)
276 && !tree_expr_maybe_infinite_p (@0)
277 && (!HONOR_SIGN_DEPENDENT_ROUNDING (type)
278 || !HONOR_SIGNED_ZEROS (type))))
279 { build_zero_cst (type); }))
281 (pointer_diff @@0 @0)
282 { build_zero_cst (type); })
285 (mult @0 integer_zerop@1)
288 /* -x == x -> x == 0 */
291 (cmp:c @0 (negate @0))
292 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
293 && !TYPE_OVERFLOW_WRAPS (TREE_TYPE(@0)))
294 (cmp @0 { build_zero_cst (TREE_TYPE(@0)); }))))
296 /* Maybe fold x * 0 to 0. The expressions aren't the same
297 when x is NaN, since x * 0 is also NaN. Nor are they the
298 same in modes with signed zeros, since multiplying a
299 negative value by 0 gives -0, not +0. Nor when x is +-Inf,
300 since x * 0 is NaN. */
302 (mult @0 real_zerop@1)
303 (if (!tree_expr_maybe_nan_p (@0)
304 && (!HONOR_NANS (type) || !tree_expr_maybe_infinite_p (@0))
305 && (!HONOR_SIGNED_ZEROS (type) || tree_expr_nonnegative_p (@0)))
308 /* In IEEE floating point, x*1 is not equivalent to x for snans.
309 Likewise for complex arithmetic with signed zeros. */
312 (if (!tree_expr_maybe_signaling_nan_p (@0)
313 && (!HONOR_SIGNED_ZEROS (type)
314 || !COMPLEX_FLOAT_TYPE_P (type)))
317 /* Transform x * -1.0 into -x. */
319 (mult @0 real_minus_onep)
320 (if (!tree_expr_maybe_signaling_nan_p (@0)
321 && (!HONOR_SIGNED_ZEROS (type)
322 || !COMPLEX_FLOAT_TYPE_P (type)))
325 /* Transform x * { 0 or 1, 0 or 1, ... } into x & { 0 or -1, 0 or -1, ...},
326 unless the target has native support for the former but not the latter. */
328 (mult @0 VECTOR_CST@1)
329 (if (initializer_each_zero_or_onep (@1)
330 && !HONOR_SNANS (type)
331 && !HONOR_SIGNED_ZEROS (type))
332 (with { tree itype = FLOAT_TYPE_P (type) ? unsigned_type_for (type) : type; }
334 && (!VECTOR_MODE_P (TYPE_MODE (type))
335 || (VECTOR_MODE_P (TYPE_MODE (itype))
336 && optab_handler (and_optab,
337 TYPE_MODE (itype)) != CODE_FOR_nothing)))
338 (view_convert (bit_and:itype (view_convert @0)
339 (ne @1 { build_zero_cst (type); })))))))
341 /* In SWAR (SIMD within a register) code a signed comparison of packed data
342 can be constructed with a particular combination of shift, bitwise and,
343 and multiplication by constants. If that code is vectorized we can
344 convert this pattern into a more efficient vector comparison. */
346 (mult (bit_and (rshift @0 uniform_integer_cst_p@1)
347 uniform_integer_cst_p@2)
348 uniform_integer_cst_p@3)
350 tree rshift_cst = uniform_integer_cst_p (@1);
351 tree bit_and_cst = uniform_integer_cst_p (@2);
352 tree mult_cst = uniform_integer_cst_p (@3);
354 /* Make sure we're working with vectors and uniform vector constants. */
355 (if (VECTOR_TYPE_P (type)
356 && tree_fits_uhwi_p (rshift_cst)
357 && tree_fits_uhwi_p (mult_cst)
358 && tree_fits_uhwi_p (bit_and_cst))
359 /* Compute what constants would be needed for this to represent a packed
360 comparison based on the shift amount denoted by RSHIFT_CST. */
362 HOST_WIDE_INT vec_elem_bits = vector_element_bits (type);
363 poly_int64 vec_nelts = TYPE_VECTOR_SUBPARTS (type);
364 poly_int64 vec_bits = vec_elem_bits * vec_nelts;
365 unsigned HOST_WIDE_INT cmp_bits_i, bit_and_i, mult_i;
366 unsigned HOST_WIDE_INT target_mult_i, target_bit_and_i;
367 cmp_bits_i = tree_to_uhwi (rshift_cst) + 1;
368 mult_i = tree_to_uhwi (mult_cst);
369 target_mult_i = (HOST_WIDE_INT_1U << cmp_bits_i) - 1;
370 bit_and_i = tree_to_uhwi (bit_and_cst);
371 target_bit_and_i = 0;
373 /* The bit pattern in BIT_AND_I should be a mask for the least
374 significant bit of each packed element that is CMP_BITS wide. */
375 for (unsigned i = 0; i < vec_elem_bits / cmp_bits_i; i++)
376 target_bit_and_i = (target_bit_and_i << cmp_bits_i) | 1U;
378 (if ((exact_log2 (cmp_bits_i)) >= 0
379 && cmp_bits_i < HOST_BITS_PER_WIDE_INT
380 && multiple_p (vec_bits, cmp_bits_i)
381 && vec_elem_bits <= HOST_BITS_PER_WIDE_INT
382 && target_mult_i == mult_i
383 && target_bit_and_i == bit_and_i)
384 /* Compute the vector shape for the comparison and check if the target is
385 able to expand the comparison with that type. */
387 /* We're doing a signed comparison. */
388 tree cmp_type = build_nonstandard_integer_type (cmp_bits_i, 0);
389 poly_int64 vector_type_nelts = exact_div (vec_bits, cmp_bits_i);
390 tree vec_cmp_type = build_vector_type (cmp_type, vector_type_nelts);
391 tree vec_truth_type = truth_type_for (vec_cmp_type);
392 tree zeros = build_zero_cst (vec_cmp_type);
393 tree ones = build_all_ones_cst (vec_cmp_type);
395 (if (expand_vec_cmp_expr_p (vec_cmp_type, vec_truth_type, LT_EXPR)
396 && expand_vec_cond_expr_p (vec_cmp_type, vec_truth_type, LT_EXPR))
397 (view_convert:type (vec_cond (lt:vec_truth_type
398 (view_convert:vec_cmp_type @0)
400 { ones; } { zeros; })))))))))
402 (for cmp (gt ge lt le)
403 outp (convert convert negate negate)
404 outn (negate negate convert convert)
405 /* Transform X * (X > 0.0 ? 1.0 : -1.0) into abs(X). */
406 /* Transform X * (X >= 0.0 ? 1.0 : -1.0) into abs(X). */
407 /* Transform X * (X < 0.0 ? 1.0 : -1.0) into -abs(X). */
408 /* Transform X * (X <= 0.0 ? 1.0 : -1.0) into -abs(X). */
410 (mult:c @0 (cond (cmp @0 real_zerop) real_onep@1 real_minus_onep))
411 (if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
413 /* Transform X * (X > 0.0 ? -1.0 : 1.0) into -abs(X). */
414 /* Transform X * (X >= 0.0 ? -1.0 : 1.0) into -abs(X). */
415 /* Transform X * (X < 0.0 ? -1.0 : 1.0) into abs(X). */
416 /* Transform X * (X <= 0.0 ? -1.0 : 1.0) into abs(X). */
418 (mult:c @0 (cond (cmp @0 real_zerop) real_minus_onep real_onep@1))
419 (if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
422 /* Transform X * copysign (1.0, X) into abs(X). */
424 (mult:c @0 (COPYSIGN_ALL real_onep @0))
425 (if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
428 /* Transform X * copysign (1.0, -X) into -abs(X). */
430 (mult:c @0 (COPYSIGN_ALL real_onep (negate @0)))
431 (if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
434 /* Transform copysign (CST, X) into copysign (ABS(CST), X). */
436 (COPYSIGN_ALL REAL_CST@0 @1)
437 (if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (@0)))
438 (COPYSIGN_ALL (negate @0) @1)))
440 /* Transform c ? x * copysign (1, y) : z to c ? x ^ signs(y) : z.
441 tree-ssa-math-opts.cc does the corresponding optimization for
442 unconditional multiplications (via xorsign). */
444 (IFN_COND_MUL:c @0 @1 (IFN_COPYSIGN real_onep @2) @3)
445 (with { tree signs = sign_mask_for (type); }
447 (with { tree inttype = TREE_TYPE (signs); }
449 (IFN_COND_XOR:inttype @0
450 (view_convert:inttype @1)
451 (bit_and (view_convert:inttype @2) { signs; })
452 (view_convert:inttype @3)))))))
454 /* (x >= 0 ? x : 0) + (x <= 0 ? -x : 0) -> abs x. */
456 (plus:c (max @0 integer_zerop) (max (negate @0) integer_zerop))
457 (if (ANY_INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_UNDEFINED (type))
460 /* X * 1, X / 1 -> X. */
461 (for op (mult trunc_div ceil_div floor_div round_div exact_div)
466 /* (A / (1 << B)) -> (A >> B).
467 Only for unsigned A. For signed A, this would not preserve rounding
469 For example: (-1 / ( 1 << B)) != -1 >> B.
470 Also handle widening conversions, like:
471 (A / (unsigned long long) (1U << B)) -> (A >> B)
473 (A / (unsigned long long) (1 << B)) -> (A >> B).
474 If the left shift is signed, it can be done only if the upper bits
475 of A starting from shift's type sign bit are zero, as
476 (unsigned long long) (1 << 31) is -2147483648ULL, not 2147483648ULL,
477 so it is valid only if A >> 31 is zero. */
479 (trunc_div (convert?@0 @3) (convert2? (lshift integer_onep@1 @2)))
480 (if ((TYPE_UNSIGNED (type) || tree_expr_nonnegative_p (@0))
481 && (!VECTOR_TYPE_P (type)
482 || target_supports_op_p (type, RSHIFT_EXPR, optab_vector)
483 || target_supports_op_p (type, RSHIFT_EXPR, optab_scalar))
484 && (useless_type_conversion_p (type, TREE_TYPE (@1))
485 || (element_precision (type) >= element_precision (TREE_TYPE (@1))
486 && (TYPE_UNSIGNED (TREE_TYPE (@1))
487 || (element_precision (type)
488 == element_precision (TREE_TYPE (@1)))
489 || (INTEGRAL_TYPE_P (type)
490 && (tree_nonzero_bits (@0)
491 & wi::mask (element_precision (TREE_TYPE (@1)) - 1,
493 element_precision (type))) == 0)))))
494 (if (!VECTOR_TYPE_P (type)
495 && useless_type_conversion_p (TREE_TYPE (@3), TREE_TYPE (@1))
496 && element_precision (TREE_TYPE (@3)) < element_precision (type))
497 (convert (rshift @3 @2))
500 /* Preserve explicit divisions by 0: the C++ front-end wants to detect
501 undefined behavior in constexpr evaluation, and assuming that the division
502 traps enables better optimizations than these anyway. */
503 (for div (trunc_div ceil_div floor_div round_div exact_div)
504 /* 0 / X is always zero. */
506 (div integer_zerop@0 @1)
507 /* But not for 0 / 0 so that we can get the proper warnings and errors. */
508 (if (!integer_zerop (@1))
512 (div @0 integer_minus_onep@1)
513 (if (!TYPE_UNSIGNED (type))
515 /* X / bool_range_Y is X. */
518 (if (INTEGRAL_TYPE_P (type)
519 && ssa_name_has_boolean_range (@1)
520 && !flag_non_call_exceptions)
525 /* But not for 0 / 0 so that we can get the proper warnings and errors.
526 And not for _Fract types where we can't build 1. */
527 (if (!ALL_FRACT_MODE_P (TYPE_MODE (type))
528 && !integer_zerop (@0)
529 && (!flag_non_call_exceptions || tree_expr_nonzero_p (@0)))
530 { build_one_cst (type); }))
531 /* X / abs (X) is X < 0 ? -1 : 1. */
534 (if (INTEGRAL_TYPE_P (type)
535 && TYPE_OVERFLOW_UNDEFINED (type)
536 && !integer_zerop (@0)
537 && (!flag_non_call_exceptions || tree_expr_nonzero_p (@0)))
538 (cond (lt @0 { build_zero_cst (type); })
539 { build_minus_one_cst (type); } { build_one_cst (type); })))
542 (div:C @0 (negate @0))
543 (if ((INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
544 && TYPE_OVERFLOW_UNDEFINED (type)
545 && !integer_zerop (@0)
546 && (!flag_non_call_exceptions || tree_expr_nonzero_p (@0)))
547 { build_minus_one_cst (type); })))
549 /* For unsigned integral types, FLOOR_DIV_EXPR is the same as
550 TRUNC_DIV_EXPR. Rewrite into the latter in this case. Similarly
551 for MOD instead of DIV. */
552 (for floor_divmod (floor_div floor_mod)
553 trunc_divmod (trunc_div trunc_mod)
556 (if ((INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
557 && TYPE_UNSIGNED (type))
558 (trunc_divmod @0 @1))))
560 /* 1 / X -> X == 1 for unsigned integer X.
561 1 / X -> X >= -1 && X <= 1 ? X : 0 for signed integer X.
562 But not for 1 / 0 so that we can get proper warnings and errors,
563 and not for 1-bit integers as they are edge cases better handled
564 elsewhere. Delay the conversion of the signed division until late
565 because `1 / X` is simplier to handle than the resulting COND_EXPR. */
567 (trunc_div integer_onep@0 @1)
568 (if (INTEGRAL_TYPE_P (type)
569 && TYPE_PRECISION (type) > 1
570 && !integer_zerop (@1)
571 && (!flag_non_call_exceptions || tree_expr_nonzero_p (@1)))
572 (if (TYPE_UNSIGNED (type))
573 (convert (eq:boolean_type_node @1 { build_one_cst (type); }))
574 (if (!canonicalize_math_p ())
575 (with { tree utype = unsigned_type_for (type); }
576 (cond (le (plus (convert:utype @1) { build_one_cst (utype); })
577 { build_int_cst (utype, 2); })
578 @1 { build_zero_cst (type); }))))))
580 /* Combine two successive divisions. Note that combining ceil_div
581 and floor_div is trickier and combining round_div even more so. */
582 (for div (trunc_div exact_div)
584 (div (div@3 @0 INTEGER_CST@1) INTEGER_CST@2)
586 wi::overflow_type overflow;
587 wide_int mul = wi::mul (wi::to_wide (@1), wi::to_wide (@2),
588 TYPE_SIGN (type), &overflow);
590 (if (div == EXACT_DIV_EXPR
591 || optimize_successive_divisions_p (@2, @3))
593 (div @0 { wide_int_to_tree (type, mul); })
594 (if (TYPE_UNSIGNED (type)
595 || mul != wi::min_value (TYPE_PRECISION (type), SIGNED))
596 { build_zero_cst (type); }))))))
598 /* Combine successive multiplications. Similar to above, but handling
599 overflow is different. */
601 (mult (mult @0 INTEGER_CST@1) INTEGER_CST@2)
603 wi::overflow_type overflow;
604 wide_int mul = wi::mul (wi::to_wide (@1), wi::to_wide (@2),
605 TYPE_SIGN (type), &overflow);
607 /* Skip folding on overflow: the only special case is @1 * @2 == -INT_MIN,
608 otherwise undefined overflow implies that @0 must be zero. */
609 (if (!overflow || TYPE_OVERFLOW_WRAPS (type))
610 (mult @0 { wide_int_to_tree (type, mul); }))))
612 /* Similar to above, but there could be an extra add/sub between
613 successive multuiplications. */
615 (mult (plus:s (mult:s@4 @0 INTEGER_CST@1) INTEGER_CST@2) INTEGER_CST@3)
617 bool overflowed = true;
618 wi::overflow_type ovf1, ovf2;
619 wide_int mul = wi::mul (wi::to_wide (@1), wi::to_wide (@3),
620 TYPE_SIGN (type), &ovf1);
621 wide_int add = wi::mul (wi::to_wide (@2), wi::to_wide (@3),
622 TYPE_SIGN (type), &ovf2);
623 if (TYPE_OVERFLOW_UNDEFINED (type))
627 if (ovf1 == wi::OVF_NONE && ovf2 == wi::OVF_NONE
628 && get_global_range_query ()->range_of_expr (vr0, @4)
629 && !vr0.varying_p () && !vr0.undefined_p ())
631 wide_int wmin0 = vr0.lower_bound ();
632 wide_int wmax0 = vr0.upper_bound ();
633 wmin0 = wi::mul (wmin0, wi::to_wide (@3), TYPE_SIGN (type), &ovf1);
634 wmax0 = wi::mul (wmax0, wi::to_wide (@3), TYPE_SIGN (type), &ovf2);
635 if (ovf1 == wi::OVF_NONE && ovf2 == wi::OVF_NONE)
637 wi::add (wmin0, add, TYPE_SIGN (type), &ovf1);
638 wi::add (wmax0, add, TYPE_SIGN (type), &ovf2);
639 if (ovf1 == wi::OVF_NONE && ovf2 == wi::OVF_NONE)
648 /* Skip folding on overflow. */
650 (plus (mult @0 { wide_int_to_tree (type, mul); })
651 { wide_int_to_tree (type, add); }))))
653 /* Similar to above, but a multiplication between successive additions. */
655 (plus (mult:s (plus:s @0 INTEGER_CST@1) INTEGER_CST@2) INTEGER_CST@3)
657 bool overflowed = true;
658 wi::overflow_type ovf1;
659 wi::overflow_type ovf2;
660 wide_int mul = wi::mul (wi::to_wide (@1), wi::to_wide (@2),
661 TYPE_SIGN (type), &ovf1);
662 wide_int add = wi::add (mul, wi::to_wide (@3),
663 TYPE_SIGN (type), &ovf2);
664 if (TYPE_OVERFLOW_UNDEFINED (type))
668 if (ovf1 == wi::OVF_NONE && ovf2 == wi::OVF_NONE
669 && get_global_range_query ()->range_of_expr (vr0, @0)
670 && !vr0.varying_p () && !vr0.undefined_p ())
672 wide_int wmin0 = vr0.lower_bound ();
673 wide_int wmax0 = vr0.upper_bound ();
674 wmin0 = wi::mul (wmin0, wi::to_wide (@2), TYPE_SIGN (type), &ovf1);
675 wmax0 = wi::mul (wmax0, wi::to_wide (@2), TYPE_SIGN (type), &ovf2);
676 if (ovf1 == wi::OVF_NONE && ovf2 == wi::OVF_NONE)
678 wi::add (wmin0, mul, TYPE_SIGN (type), &ovf1);
679 wi::add (wmax0, mul, TYPE_SIGN (type), &ovf2);
680 if (ovf1 == wi::OVF_NONE && ovf2 == wi::OVF_NONE)
689 /* Skip folding on overflow. */
691 (plus (mult @0 @2) { wide_int_to_tree (type, add); }))))
693 /* Optimize A / A to 1.0 if we don't care about
694 NaNs or Infinities. */
697 (if (FLOAT_TYPE_P (type)
698 && ! HONOR_NANS (type)
699 && ! HONOR_INFINITIES (type))
700 { build_one_cst (type); }))
702 /* Optimize -A / A to -1.0 if we don't care about
703 NaNs or Infinities. */
705 (rdiv:C @0 (negate @0))
706 (if (FLOAT_TYPE_P (type)
707 && ! HONOR_NANS (type)
708 && ! HONOR_INFINITIES (type))
709 { build_minus_one_cst (type); }))
711 /* PR71078: x / abs(x) -> copysign (1.0, x) */
713 (rdiv:C (convert? @0) (convert? (abs @0)))
714 (if (SCALAR_FLOAT_TYPE_P (type)
715 && ! HONOR_NANS (type)
716 && ! HONOR_INFINITIES (type))
718 (if (types_match (type, float_type_node))
719 (BUILT_IN_COPYSIGNF { build_one_cst (type); } (convert @0)))
720 (if (types_match (type, double_type_node))
721 (BUILT_IN_COPYSIGN { build_one_cst (type); } (convert @0)))
722 (if (types_match (type, long_double_type_node))
723 (BUILT_IN_COPYSIGNL { build_one_cst (type); } (convert @0))))))
725 /* In IEEE floating point, x/1 is not equivalent to x for snans. */
728 (if (!tree_expr_maybe_signaling_nan_p (@0))
731 /* In IEEE floating point, x/-1 is not equivalent to -x for snans. */
733 (rdiv @0 real_minus_onep)
734 (if (!tree_expr_maybe_signaling_nan_p (@0))
737 (if (flag_reciprocal_math)
738 /* Convert (A/B)/C to A/(B*C). */
740 (rdiv (rdiv:s @0 @1) @2)
741 (rdiv @0 (mult @1 @2)))
743 /* Canonicalize x / (C1 * y) to (x * C2) / y. */
745 (rdiv @0 (mult:s @1 REAL_CST@2))
747 { tree tem = const_binop (RDIV_EXPR, type, build_one_cst (type), @2); }
749 (rdiv (mult @0 { tem; } ) @1))))
751 /* Convert A/(B/C) to (A/B)*C */
753 (rdiv @0 (rdiv:s @1 @2))
754 (mult (rdiv @0 @1) @2)))
756 /* Simplify x / (- y) to -x / y. */
758 (rdiv @0 (negate @1))
759 (rdiv (negate @0) @1))
761 (if (flag_unsafe_math_optimizations)
762 /* Simplify (C / x op 0.0) to x op 0.0 for C != 0, C != Inf/Nan.
763 Since C / x may underflow to zero, do this only for unsafe math. */
764 (for op (lt le gt ge)
767 (op (rdiv REAL_CST@0 @1) real_zerop@2)
768 (if (!HONOR_SIGNED_ZEROS (@1) && !HONOR_INFINITIES (@1))
770 (if (real_less (&dconst0, TREE_REAL_CST_PTR (@0)))
772 /* For C < 0, use the inverted operator. */
773 (if (real_less (TREE_REAL_CST_PTR (@0), &dconst0))
776 /* Optimize (X & (-A)) / A where A is a power of 2, to X >> log2(A) */
777 (for div (trunc_div ceil_div floor_div round_div exact_div)
779 (div (convert? (bit_and @0 INTEGER_CST@1)) INTEGER_CST@2)
780 (if (integer_pow2p (@2)
781 && tree_int_cst_sgn (@2) > 0
782 && tree_nop_conversion_p (type, TREE_TYPE (@0))
783 && wi::to_wide (@2) + wi::to_wide (@1) == 0)
785 { build_int_cst (integer_type_node,
786 wi::exact_log2 (wi::to_wide (@2))); }))))
788 /* If ARG1 is a constant, we can convert this to a multiply by the
789 reciprocal. This does not have the same rounding properties,
790 so only do this if -freciprocal-math. We can actually
791 always safely do it if ARG1 is a power of two, but it's hard to
792 tell if it is or not in a portable manner. */
793 (for cst (REAL_CST COMPLEX_CST VECTOR_CST)
797 (if (flag_reciprocal_math
800 { tree tem = const_binop (RDIV_EXPR, type, build_one_cst (type), @1); }
802 (mult @0 { tem; } )))
803 (if (cst != COMPLEX_CST)
804 (with { tree inverse = exact_inverse (type, @1); }
806 (mult @0 { inverse; } ))))))))
808 (for mod (ceil_mod floor_mod round_mod trunc_mod)
809 /* 0 % X is always zero. */
811 (mod integer_zerop@0 @1)
812 /* But not for 0 % 0 so that we can get the proper warnings and errors. */
813 (if (!integer_zerop (@1))
815 /* X % 1 is always zero. */
817 (mod @0 integer_onep)
818 { build_zero_cst (type); })
819 /* X % -1 is zero. */
821 (mod @0 integer_minus_onep@1)
822 (if (!TYPE_UNSIGNED (type))
823 { build_zero_cst (type); }))
827 /* But not for 0 % 0 so that we can get the proper warnings and errors. */
828 (if (!integer_zerop (@0))
829 { build_zero_cst (type); }))
830 /* (X % Y) % Y is just X % Y. */
832 (mod (mod@2 @0 @1) @1)
834 /* From extract_muldiv_1: (X * C1) % C2 is zero if C1 is a multiple of C2. */
836 (mod (mult @0 INTEGER_CST@1) INTEGER_CST@2)
837 (if (ANY_INTEGRAL_TYPE_P (type)
838 && TYPE_OVERFLOW_UNDEFINED (type)
839 && wi::multiple_of_p (wi::to_wide (@1), wi::to_wide (@2),
841 { build_zero_cst (type); }))
842 /* For (X % C) == 0, if X is signed and C is power of 2, use unsigned
843 modulo and comparison, since it is simpler and equivalent. */
846 (cmp (mod @0 integer_pow2p@2) integer_zerop@1)
847 (if (!TYPE_UNSIGNED (TREE_TYPE (@0)))
848 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
849 (cmp (mod (convert:utype @0) (convert:utype @2)) (convert:utype @1)))))))
851 /* X % -C is the same as X % C. */
853 (trunc_mod @0 INTEGER_CST@1)
854 (if (TYPE_SIGN (type) == SIGNED
855 && !TREE_OVERFLOW (@1)
856 && wi::neg_p (wi::to_wide (@1))
857 && !TYPE_OVERFLOW_TRAPS (type)
858 /* Avoid this transformation if C is INT_MIN, i.e. C == -C. */
859 && !sign_bit_p (@1, @1))
860 (trunc_mod @0 (negate @1))))
862 /* X % -Y is the same as X % Y. */
864 (trunc_mod @0 (convert? (negate @1)))
865 (if (INTEGRAL_TYPE_P (type)
866 && !TYPE_UNSIGNED (type)
867 && !TYPE_OVERFLOW_TRAPS (type)
868 && tree_nop_conversion_p (type, TREE_TYPE (@1))
869 /* Avoid this transformation if X might be INT_MIN or
870 Y might be -1, because we would then change valid
871 INT_MIN % -(-1) into invalid INT_MIN % -1. */
872 && (expr_not_equal_to (@0, wi::to_wide (TYPE_MIN_VALUE (type)))
873 || expr_not_equal_to (@1, wi::minus_one (TYPE_PRECISION
875 (trunc_mod @0 (convert @1))))
877 /* X - (X / Y) * Y is the same as X % Y. */
879 (minus (convert1? @0) (convert2? (mult:c (trunc_div @@0 @@1) @1)))
880 (if (INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
881 (convert (trunc_mod @0 @1))))
883 /* x * (1 + y / x) - y -> x - y % x */
885 (minus (mult:cs @0 (plus:s (trunc_div:s @1 @0) integer_onep)) @1)
886 (if (INTEGRAL_TYPE_P (type))
887 (minus @0 (trunc_mod @1 @0))))
889 /* Optimize TRUNC_MOD_EXPR by a power of two into a BIT_AND_EXPR,
890 i.e. "X % C" into "X & (C - 1)", if X and C are positive.
891 Also optimize A % (C << N) where C is a power of 2,
892 to A & ((C << N) - 1).
893 Also optimize "A shift (B % C)", if C is a power of 2, to
894 "A shift (B & (C - 1))". SHIFT operation include "<<" and ">>"
895 and assume (B % C) is nonnegative as shifts negative values would
897 (match (power_of_two_cand @1)
899 (match (power_of_two_cand @1)
900 (lshift INTEGER_CST@1 @2))
901 (for mod (trunc_mod floor_mod)
902 (for shift (lshift rshift)
904 (shift @0 (mod @1 (power_of_two_cand@2 @3)))
905 (if (integer_pow2p (@3) && tree_int_cst_sgn (@3) > 0)
906 (shift @0 (bit_and @1 (minus @2 { build_int_cst (TREE_TYPE (@2),
909 (mod @0 (convert? (power_of_two_cand@1 @2)))
910 (if ((TYPE_UNSIGNED (type) || tree_expr_nonnegative_p (@0))
911 /* Allow any integral conversions of the divisor, except
912 conversion from narrower signed to wider unsigned type
913 where if @1 would be negative power of two, the divisor
914 would not be a power of two. */
915 && INTEGRAL_TYPE_P (type)
916 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
917 && (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@1))
918 || TYPE_UNSIGNED (TREE_TYPE (@1))
919 || !TYPE_UNSIGNED (type))
920 && integer_pow2p (@2) && tree_int_cst_sgn (@2) > 0)
921 (with { tree utype = TREE_TYPE (@1);
922 if (!TYPE_OVERFLOW_WRAPS (utype))
923 utype = unsigned_type_for (utype); }
924 (bit_and @0 (convert (minus (convert:utype @1)
925 { build_one_cst (utype); })))))))
927 /* Simplify (unsigned t * 2)/2 -> unsigned t & 0x7FFFFFFF. */
929 (trunc_div (mult @0 integer_pow2p@1) @1)
930 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) && TYPE_UNSIGNED (TREE_TYPE (@0)))
931 (bit_and @0 { wide_int_to_tree
932 (type, wi::mask (TYPE_PRECISION (type)
933 - wi::exact_log2 (wi::to_wide (@1)),
934 false, TYPE_PRECISION (type))); })))
936 /* Simplify (unsigned t / 2) * 2 -> unsigned t & ~1. */
938 (mult (trunc_div @0 integer_pow2p@1) @1)
939 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) && TYPE_UNSIGNED (TREE_TYPE (@0)))
940 (bit_and @0 (negate @1))))
942 (for div (trunc_div ceil_div floor_div round_div exact_div)
943 /* Simplify (t * u) / u -> t. */
945 (div (mult:c @0 @1) @1)
946 (if (ANY_INTEGRAL_TYPE_P (type))
947 (if (TYPE_OVERFLOW_UNDEFINED (type) && !TYPE_OVERFLOW_SANITIZED (type))
950 (with {value_range vr0, vr1;}
951 (if (INTEGRAL_TYPE_P (type)
952 && get_range_query (cfun)->range_of_expr (vr0, @0)
953 && get_range_query (cfun)->range_of_expr (vr1, @1)
954 && range_op_handler (MULT_EXPR).overflow_free_p (vr0, vr1))
959 /* Simplify (t * u) / v -> t * (u / v) if u is multiple of v. */
961 (div (mult @0 INTEGER_CST@1) INTEGER_CST@2)
962 (if (INTEGRAL_TYPE_P (type)
963 && wi::multiple_of_p (wi::to_widest (@1), wi::to_widest (@2), SIGNED))
964 (if (TYPE_OVERFLOW_UNDEFINED (type) && !TYPE_OVERFLOW_SANITIZED (type))
965 (mult @0 (div! @1 @2))
966 (with {value_range vr0, vr1;}
967 (if (get_range_query (cfun)->range_of_expr (vr0, @0)
968 && get_range_query (cfun)->range_of_expr (vr1, @1)
969 && range_op_handler (MULT_EXPR).overflow_free_p (vr0, vr1))
970 (mult @0 (div! @1 @2))))
973 /* Simplify (t * u) / (t * v) -> (u / v) if u is multiple of v. */
975 (div (mult @0 INTEGER_CST@1) (mult @0 INTEGER_CST@2))
976 (if (INTEGRAL_TYPE_P (type)
977 && wi::multiple_of_p (wi::to_widest (@1), wi::to_widest (@2), SIGNED))
978 (if (TYPE_OVERFLOW_UNDEFINED (type) && !TYPE_OVERFLOW_SANITIZED (type))
981 (with {value_range vr0, vr1, vr2;}
982 (if (get_range_query (cfun)->range_of_expr (vr0, @0)
983 && get_range_query (cfun)->range_of_expr (vr1, @1)
984 && get_range_query (cfun)->range_of_expr (vr2, @2)
985 && range_op_handler (MULT_EXPR).overflow_free_p (vr0, vr1)
986 && range_op_handler (MULT_EXPR).overflow_free_p (vr0, vr2))
992 (for div (trunc_div exact_div)
993 /* Simplify (X + M*N) / N -> X / N + M. */
995 (div (plus:c@4 @0 (mult:c@3 @1 @2)) @2)
996 (with {value_range vr0, vr1, vr2, vr3, vr4;}
997 (if (INTEGRAL_TYPE_P (type)
998 && get_range_query (cfun)->range_of_expr (vr1, @1)
999 && get_range_query (cfun)->range_of_expr (vr2, @2)
1000 /* "N*M" doesn't overflow. */
1001 && range_op_handler (MULT_EXPR).overflow_free_p (vr1, vr2)
1002 && get_range_query (cfun)->range_of_expr (vr0, @0)
1003 && get_range_query (cfun)->range_of_expr (vr3, @3)
1004 /* "X+(N*M)" doesn't overflow. */
1005 && range_op_handler (PLUS_EXPR).overflow_free_p (vr0, vr3)
1006 && get_range_query (cfun)->range_of_expr (vr4, @4)
1007 && !vr4.undefined_p ()
1008 /* "X+N*M" is not with opposite sign as "X". */
1009 && (TYPE_UNSIGNED (type)
1010 || (vr0.nonnegative_p () && vr4.nonnegative_p ())
1011 || (vr0.nonpositive_p () && vr4.nonpositive_p ())))
1012 (plus (div @0 @2) @1))))
1014 /* Simplify (X - M*N) / N -> X / N - M. */
1016 (div (minus@4 @0 (mult:c@3 @1 @2)) @2)
1017 (with {value_range vr0, vr1, vr2, vr3, vr4;}
1018 (if (INTEGRAL_TYPE_P (type)
1019 && get_range_query (cfun)->range_of_expr (vr1, @1)
1020 && get_range_query (cfun)->range_of_expr (vr2, @2)
1021 /* "N * M" doesn't overflow. */
1022 && range_op_handler (MULT_EXPR).overflow_free_p (vr1, vr2)
1023 && get_range_query (cfun)->range_of_expr (vr0, @0)
1024 && get_range_query (cfun)->range_of_expr (vr3, @3)
1025 /* "X - (N*M)" doesn't overflow. */
1026 && range_op_handler (MINUS_EXPR).overflow_free_p (vr0, vr3)
1027 && get_range_query (cfun)->range_of_expr (vr4, @4)
1028 && !vr4.undefined_p ()
1029 /* "X-N*M" is not with opposite sign as "X". */
1030 && (TYPE_UNSIGNED (type)
1031 || (vr0.nonnegative_p () && vr4.nonnegative_p ())
1032 || (vr0.nonpositive_p () && vr4.nonpositive_p ())))
1033 (minus (div @0 @2) @1)))))
1036 (X + C) / N -> X / N + C / N where C is multiple of N.
1037 (X + C) >> N -> X >> N + C>>N if low N bits of C is 0. */
1038 (for op (trunc_div exact_div rshift)
1040 (op (plus@3 @0 INTEGER_CST@1) INTEGER_CST@2)
1043 wide_int c = wi::to_wide (@1);
1044 wide_int n = wi::to_wide (@2);
1045 bool shift = op == RSHIFT_EXPR;
1046 #define plus_op1(v) (shift ? wi::rshift (v, n, TYPE_SIGN (type)) \
1047 : wi::div_trunc (v, n, TYPE_SIGN (type)))
1048 #define exact_mod(v) (shift ? wi::ctz (v) >= n.to_shwi () \
1049 : wi::multiple_of_p (v, n, TYPE_SIGN (type)))
1050 value_range vr0, vr1, vr3;
1052 (if (INTEGRAL_TYPE_P (type)
1053 && get_range_query (cfun)->range_of_expr (vr0, @0))
1055 && get_range_query (cfun)->range_of_expr (vr1, @1)
1056 /* "X+C" doesn't overflow. */
1057 && range_op_handler (PLUS_EXPR).overflow_free_p (vr0, vr1)
1058 && get_range_query (cfun)->range_of_expr (vr3, @3)
1059 && !vr3.undefined_p ()
1060 /* "X+C" and "X" are not of opposite sign. */
1061 && (TYPE_UNSIGNED (type)
1062 || (vr0.nonnegative_p () && vr3.nonnegative_p ())
1063 || (vr0.nonpositive_p () && vr3.nonpositive_p ())))
1064 (plus (op @0 @2) { wide_int_to_tree (type, plus_op1 (c)); })
1065 (if (!vr0.undefined_p () && TYPE_UNSIGNED (type) && c.sign_mask () < 0
1067 /* unsigned "X-(-C)" doesn't underflow. */
1068 && wi::geu_p (vr0.lower_bound (), -c))
1069 (plus (op @0 @2) { wide_int_to_tree (type, -plus_op1 (-c)); })))))))
1074 /* (nop_outer_cast)-(inner_cast)var -> -(outer_cast)(var)
1075 if var is smaller in precision.
1076 This is always safe for both doing the negative in signed or unsigned
1077 as the value for undefined will not show up.
1078 Note the outer cast cannot be a boolean type as the only valid values
1079 are 0,-1/1 (depending on the signedness of the boolean) and the negative
1080 is there to get the correct value. */
1082 (convert (negate:s@1 (convert:s @0)))
1083 (if (INTEGRAL_TYPE_P (type)
1084 && tree_nop_conversion_p (type, TREE_TYPE (@1))
1085 && TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (@0))
1086 && TREE_CODE (type) != BOOLEAN_TYPE)
1087 (negate (convert @0))))
1089 (for op (negate abs)
1090 /* Simplify cos(-x) and cos(|x|) -> cos(x). Similarly for cosh. */
1091 (for coss (COS COSH)
1095 /* Simplify pow(-x, y) and pow(|x|,y) -> pow(x,y) if y is an even integer. */
1098 (pows (op @0) REAL_CST@1)
1099 (with { HOST_WIDE_INT n; }
1100 (if (real_isinteger (&TREE_REAL_CST (@1), &n) && (n & 1) == 0)
1102 /* Likewise for powi. */
1105 (pows (op @0) INTEGER_CST@1)
1106 (if ((wi::to_wide (@1) & 1) == 0)
1108 /* Strip negate and abs from both operands of hypot. */
1116 /* copysign(-x, y) and copysign(abs(x), y) -> copysign(x, y). */
1117 (for copysigns (COPYSIGN_ALL)
1119 (copysigns (op @0) @1)
1120 (copysigns @0 @1))))
1122 /* abs(x)*abs(x) -> x*x. Should be valid for all types. */
1124 (mult (abs@1 @0) @1)
1127 /* Convert absu(x)*absu(x) -> x*x. */
1129 (mult (absu@1 @0) @1)
1130 (mult (convert@2 @0) @2))
1132 /* cos(copysign(x, y)) -> cos(x). Similarly for cosh. */
1133 (for coss (COS COSH)
1134 (for copysigns (COPYSIGN)
1136 (coss (copysigns @0 @1))
1139 /* pow(copysign(x, y), z) -> pow(x, z) if z is an even integer. */
1141 (for copysigns (COPYSIGN)
1143 (pows (copysigns @0 @2) REAL_CST@1)
1144 (with { HOST_WIDE_INT n; }
1145 (if (real_isinteger (&TREE_REAL_CST (@1), &n) && (n & 1) == 0)
1147 /* Likewise for powi. */
1149 (for copysigns (COPYSIGN)
1151 (pows (copysigns @0 @2) INTEGER_CST@1)
1152 (if ((wi::to_wide (@1) & 1) == 0)
1156 (for copysigns (COPYSIGN)
1157 /* hypot(copysign(x, y), z) -> hypot(x, z). */
1159 (hypots (copysigns @0 @1) @2)
1161 /* hypot(x, copysign(y, z)) -> hypot(x, y). */
1163 (hypots @0 (copysigns @1 @2))
1166 /* copysign(x, CST) -> abs (x). If the target does not
1167 support the copysign optab then canonicalize
1168 copysign(x, -CST) -> fneg (abs (x)). */
1169 (for copysigns (COPYSIGN_ALL)
1171 (copysigns @0 REAL_CST@1)
1172 (if (!REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1)))
1175 (if (!direct_internal_fn_supported_p (IFN_COPYSIGN, type,
1182 /* Transform fneg (fabs (X)) -> copysign (X, -1) as the canonical
1183 representation if the target supports the copysign optab. */
1186 (if (direct_internal_fn_supported_p (IFN_COPYSIGN, type,
1188 (IFN_COPYSIGN @0 { build_minus_one_cst (type); })))
1190 /* copysign(copysign(x, y), z) -> copysign(x, z). */
1191 (for copysigns (COPYSIGN_ALL)
1193 (copysigns (copysigns @0 @1) @2)
1196 /* copysign(x,y)*copysign(x,y) -> x*x. */
1197 (for copysigns (COPYSIGN_ALL)
1199 (mult (copysigns@2 @0 @1) @2)
1202 /* ccos(-x) -> ccos(x). Similarly for ccosh. */
1203 (for ccoss (CCOS CCOSH)
1208 /* cabs(-x) and cos(conj(x)) -> cabs(x). */
1209 (for ops (conj negate)
1215 /* Fold (a * (1 << b)) into (a << b) */
1217 (mult:c @0 (convert? (lshift integer_onep@1 @2)))
1218 (if (! FLOAT_TYPE_P (type)
1219 && tree_nop_conversion_p (type, TREE_TYPE (@1)))
1222 /* Shifts by precision or greater result in zero. */
1223 (for shift (lshift rshift)
1225 (shift @0 uniform_integer_cst_p@1)
1226 (if ((GIMPLE || !sanitize_flags_p (SANITIZE_SHIFT_EXPONENT))
1227 /* Leave arithmetic right shifts of possibly negative values alone. */
1228 && (TYPE_UNSIGNED (type)
1229 || shift == LSHIFT_EXPR
1230 || tree_expr_nonnegative_p (@0))
1231 /* Use a signed compare to leave negative shift counts alone. */
1232 && wi::ges_p (wi::to_wide (uniform_integer_cst_p (@1)),
1233 element_precision (type)))
1234 { build_zero_cst (type); })))
1236 /* Shifts by constants distribute over several binary operations,
1237 hence (X << C) + (Y << C) can be simplified to (X + Y) << C. */
1238 (for op (plus minus)
1240 (op (lshift:s @0 @1) (lshift:s @2 @1))
1241 (if (INTEGRAL_TYPE_P (type)
1242 && TYPE_OVERFLOW_WRAPS (type)
1243 && !TYPE_SATURATING (type))
1244 (lshift (op @0 @2) @1))))
1246 (for op (bit_and bit_ior bit_xor)
1248 (op (lshift:s @0 @1) (lshift:s @2 @1))
1249 (if (INTEGRAL_TYPE_P (type))
1250 (lshift (op @0 @2) @1)))
1252 (op (rshift:s @0 @1) (rshift:s @2 @1))
1253 (if (INTEGRAL_TYPE_P (type))
1254 (rshift (op @0 @2) @1))))
1256 /* Fold (1 << (C - x)) where C = precision(type) - 1
1257 into ((1 << C) >> x). */
1259 (lshift integer_onep@0 (minus@1 INTEGER_CST@2 @3))
1260 (if (INTEGRAL_TYPE_P (type)
1261 && wi::eq_p (wi::to_wide (@2), TYPE_PRECISION (type) - 1)
1263 (if (TYPE_UNSIGNED (type))
1264 (rshift (lshift @0 @2) @3)
1266 { tree utype = unsigned_type_for (type); }
1267 (convert (rshift (lshift (convert:utype @0) @2) @3))))))
1269 /* Fold ((type)(a<0)) << SIGNBITOFA into ((type)a) & signbit. */
1271 (lshift (convert (lt @0 integer_zerop@1)) INTEGER_CST@2)
1272 (if (TYPE_SIGN (TREE_TYPE (@0)) == SIGNED
1273 && wi::eq_p (wi::to_wide (@2), TYPE_PRECISION (TREE_TYPE (@0)) - 1))
1274 (with { wide_int wone = wi::one (TYPE_PRECISION (type)); }
1275 (bit_and (convert @0)
1276 { wide_int_to_tree (type,
1277 wi::lshift (wone, wi::to_wide (@2))); }))))
1279 /* Fold (-x >> C) into -(x > 0) where C = precision(type) - 1. */
1280 (for cst (INTEGER_CST VECTOR_CST)
1282 (rshift (negate:s @0) cst@1)
1283 (if (!TYPE_UNSIGNED (type)
1284 && TYPE_OVERFLOW_UNDEFINED (type))
1285 (with { tree stype = TREE_TYPE (@1);
1286 tree bt = truth_type_for (type);
1287 tree zeros = build_zero_cst (type);
1288 tree cst = NULL_TREE; }
1290 /* Handle scalar case. */
1291 (if (INTEGRAL_TYPE_P (type)
1292 /* If we apply the rule to the scalar type before vectorization
1293 we will enforce the result of the comparison being a bool
1294 which will require an extra AND on the result that will be
1295 indistinguishable from when the user did actually want 0
1296 or 1 as the result so it can't be removed. */
1297 && canonicalize_math_after_vectorization_p ()
1298 && wi::eq_p (wi::to_wide (@1), TYPE_PRECISION (type) - 1))
1299 (negate (convert (gt @0 { zeros; }))))
1300 /* Handle vector case. */
1301 (if (VECTOR_INTEGER_TYPE_P (type)
1302 /* First check whether the target has the same mode for vector
1303 comparison results as it's operands do. */
1304 && TYPE_MODE (bt) == TYPE_MODE (type)
1305 /* Then check to see if the target is able to expand the comparison
1306 with the given type later on, otherwise we may ICE. */
1307 && expand_vec_cmp_expr_p (type, bt, GT_EXPR)
1308 && (cst = uniform_integer_cst_p (@1)) != NULL
1309 && wi::eq_p (wi::to_wide (cst), element_precision (type) - 1))
1310 (view_convert (gt:bt @0 { zeros; }))))))))
1312 /* Fold (C1/X)*C2 into (C1*C2)/X. */
1314 (mult (rdiv@3 REAL_CST@0 @1) REAL_CST@2)
1315 (if (flag_associative_math
1318 { tree tem = const_binop (MULT_EXPR, type, @0, @2); }
1320 (rdiv { tem; } @1)))))
1322 /* Simplify ~X & X as zero. */
1324 (bit_and (convert? @0) (convert? @1))
1325 (with { bool wascmp; }
1326 (if (types_match (TREE_TYPE (@0), TREE_TYPE (@1))
1327 && bitwise_inverted_equal_p (@0, @1, wascmp))
1328 { wascmp ? constant_boolean_node (false, type) : build_zero_cst (type); })))
1330 /* PR71636: Transform x & ((1U << b) - 1) -> x & ~(~0U << b); */
1332 (bit_and:c @0 (plus:s (lshift:s integer_onep @1) integer_minus_onep))
1333 (if (TYPE_UNSIGNED (type))
1334 (bit_and @0 (bit_not (lshift { build_all_ones_cst (type); } @1)))))
1336 (for bitop (bit_and bit_ior)
1338 /* PR35691: Transform
1339 (x == 0 & y == 0) -> (x | typeof(x)(y)) == 0.
1340 (x != 0 | y != 0) -> (x | typeof(x)(y)) != 0. */
1342 (bitop (cmp @0 integer_zerop@2) (cmp @1 integer_zerop))
1343 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1344 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
1345 && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
1346 (cmp (bit_ior @0 (convert @1)) @2)))
1348 (x == -1 & y == -1) -> (x & typeof(x)(y)) == -1.
1349 (x != -1 | y != -1) -> (x & typeof(x)(y)) != -1. */
1351 (bitop (cmp @0 integer_all_onesp@2) (cmp @1 integer_all_onesp))
1352 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1353 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
1354 && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
1355 (cmp (bit_and @0 (convert @1)) @2))))
1357 /* Fold (A & ~B) - (A & B) into (A ^ B) - B. */
1359 (minus (bit_and:cs @0 (bit_not @1)) (bit_and:cs @0 @1))
1360 (minus (bit_xor @0 @1) @1))
1362 (minus (bit_and:s @0 INTEGER_CST@2) (bit_and:s @0 INTEGER_CST@1))
1363 (if (~wi::to_wide (@2) == wi::to_wide (@1))
1364 (minus (bit_xor @0 @1) @1)))
1366 /* Fold (A & B) - (A & ~B) into B - (A ^ B). */
1368 (minus (bit_and:cs @0 @1) (bit_and:cs @0 (bit_not @1)))
1369 (minus @1 (bit_xor @0 @1)))
1371 /* Simplify (X & ~Y) |^+ (~X & Y) -> X ^ Y. */
1372 (for op (bit_ior bit_xor plus)
1374 (op (bit_and:c @0 @2) (bit_and:c @3 @1))
1375 (with { bool wascmp0, wascmp1; }
1376 (if (bitwise_inverted_equal_p (@2, @1, wascmp0)
1377 && bitwise_inverted_equal_p (@0, @3, wascmp1)
1378 && ((!wascmp0 && !wascmp1)
1379 || element_precision (type) == 1))
1382 /* PR53979: Transform ((a ^ b) | a) -> (a | b) */
1384 (bit_ior:c (bit_xor:c @0 @1) @0)
1387 /* (a & ~b) | (a ^ b) --> a ^ b */
1389 (bit_ior:c (bit_and:c @0 (bit_not @1)) (bit_xor:c@2 @0 @1))
1392 /* (a & ~b) ^ ~a --> ~(a & b) */
1394 (bit_xor:c (bit_and:cs @0 (bit_not @1)) (bit_not @0))
1395 (bit_not (bit_and @0 @1)))
1397 /* (~a & b) ^ a --> (a | b) */
1399 (bit_xor:c (bit_and:cs (bit_not @0) @1) @0)
1402 /* (a | b) & ~(a ^ b) --> a & b */
1404 (bit_and:c (bit_ior @0 @1) (bit_not (bit_xor:c @0 @1)))
1407 /* (a | b) & (a == b) --> a & b (boolean version of the above). */
1409 (bit_and:c (bit_ior @0 @1) (nop_convert? (eq:c @0 @1)))
1410 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1411 && TYPE_PRECISION (TREE_TYPE (@0)) == 1)
1414 /* a | ~(a ^ b) --> a | ~b */
1416 (bit_ior:c @0 (bit_not:s (bit_xor:c @0 @1)))
1417 (bit_ior @0 (bit_not @1)))
1419 /* a | (a == b) --> a | (b^1) (boolean version of the above). */
1421 (bit_ior:c @0 (nop_convert? (eq:c @0 @1)))
1422 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1423 && TYPE_PRECISION (TREE_TYPE (@0)) == 1)
1424 (bit_ior @0 (bit_xor @1 { build_one_cst (type); }))))
1426 /* a | ((~a) ^ b) --> a | (~b) (alt version of the above 2) */
1428 (bit_ior:c @0 (bit_xor:cs @1 @2))
1429 (with { bool wascmp; }
1430 (if (bitwise_inverted_equal_p (@0, @1, wascmp)
1431 && (!wascmp || element_precision (type) == 1))
1432 (bit_ior @0 (bit_not @2)))))
1434 /* a & ~(a ^ b) --> a & b */
1436 (bit_and:c @0 (bit_not (bit_xor:c @0 @1)))
1439 /* a & (a == b) --> a & b (boolean version of the above). */
1441 (bit_and:c @0 (nop_convert? (eq:c @0 @1)))
1442 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1443 && TYPE_PRECISION (TREE_TYPE (@0)) == 1)
1446 /* a & ((~a) ^ b) --> a & b (alt version of the above 2) */
1448 (bit_and:c @0 (bit_xor:c @1 @2))
1449 (with { bool wascmp; }
1450 (if (bitwise_inverted_equal_p (@0, @1, wascmp)
1451 && (!wascmp || element_precision (type) == 1))
1454 /* (a | b) | (a &^ b) --> a | b */
1455 (for op (bit_and bit_xor)
1457 (bit_ior:c (bit_ior@2 @0 @1) (op:c @0 @1))
1460 /* (a & b) | ~(a ^ b) --> ~(a ^ b) */
1462 (bit_ior:c (bit_and:c @0 @1) (bit_not@2 (bit_xor @0 @1)))
1465 /* (a & b) | (a == b) --> a == b */
1467 (bit_ior:c (bit_and:c @0 @1) (nop_convert?@2 (eq @0 @1)))
1468 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1469 && TYPE_PRECISION (TREE_TYPE (@0)) == 1)
1472 /* ~(~a & b) --> a | ~b */
1474 (bit_not (bit_and:cs (bit_not @0) @1))
1475 (bit_ior @0 (bit_not @1)))
1477 /* ~(~a | b) --> a & ~b */
1479 (bit_not (bit_ior:cs (bit_not @0) @1))
1480 (bit_and @0 (bit_not @1)))
1482 /* (a ^ b) & ((b ^ c) ^ a) --> (a ^ b) & ~c */
1484 (bit_and:c (bit_xor:c@3 @0 @1) (bit_xor:cs (bit_xor:cs @1 @2) @0))
1485 (bit_and @3 (bit_not @2)))
1487 /* (a ^ b) | ((b ^ c) ^ a) --> (a ^ b) | c */
1489 (bit_ior:c (bit_xor:c@3 @0 @1) (bit_xor:c (bit_xor:c @1 @2) @0))
1492 /* (~X | C) ^ D -> (X | C) ^ (~D ^ C) if (~D ^ C) can be simplified. */
1494 (bit_xor:c (bit_ior:cs (bit_not:s @0) @1) @2)
1495 (bit_xor (bit_ior @0 @1) (bit_xor! (bit_not! @2) @1)))
1497 /* (~X & C) ^ D -> (X & C) ^ (D ^ C) if (D ^ C) can be simplified. */
1499 (bit_xor:c (bit_and:cs (bit_not:s @0) @1) @2)
1500 (bit_xor (bit_and @0 @1) (bit_xor! @2 @1)))
1502 /* Simplify (~X & Y) to X ^ Y if we know that (X & ~Y) is 0. */
1504 (bit_and (bit_not SSA_NAME@0) INTEGER_CST@1)
1505 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1506 && wi::bit_and_not (get_nonzero_bits (@0), wi::to_wide (@1)) == 0)
1509 /* For constants M and N, if M == (1LL << cst) - 1 && (N & M) == M,
1510 ((A & N) + B) & M -> (A + B) & M
1511 Similarly if (N & M) == 0,
1512 ((A | N) + B) & M -> (A + B) & M
1513 and for - instead of + (or unary - instead of +)
1514 and/or ^ instead of |.
1515 If B is constant and (B & M) == 0, fold into A & M. */
1516 (for op (plus minus)
1517 (for bitop (bit_and bit_ior bit_xor)
1519 (bit_and (op:s (bitop:s@0 @3 INTEGER_CST@4) @1) INTEGER_CST@2)
1522 tree utype = fold_bit_and_mask (TREE_TYPE (@0), @2, op, @0, bitop,
1523 @3, @4, @1, ERROR_MARK, NULL_TREE,
1526 (convert (bit_and (op (convert:utype { pmop[0]; })
1527 (convert:utype { pmop[1]; }))
1528 (convert:utype @2))))))
1530 (bit_and (op:s @0 (bitop:s@1 @3 INTEGER_CST@4)) INTEGER_CST@2)
1533 tree utype = fold_bit_and_mask (TREE_TYPE (@0), @2, op, @0, ERROR_MARK,
1534 NULL_TREE, NULL_TREE, @1, bitop, @3,
1537 (convert (bit_and (op (convert:utype { pmop[0]; })
1538 (convert:utype { pmop[1]; }))
1539 (convert:utype @2)))))))
1541 (bit_and (op:s @0 @1) INTEGER_CST@2)
1544 tree utype = fold_bit_and_mask (TREE_TYPE (@0), @2, op, @0, ERROR_MARK,
1545 NULL_TREE, NULL_TREE, @1, ERROR_MARK,
1546 NULL_TREE, NULL_TREE, pmop); }
1548 (convert (bit_and (op (convert:utype { pmop[0]; })
1549 (convert:utype { pmop[1]; }))
1550 (convert:utype @2)))))))
1551 (for bitop (bit_and bit_ior bit_xor)
1553 (bit_and (negate:s (bitop:s@0 @2 INTEGER_CST@3)) INTEGER_CST@1)
1556 tree utype = fold_bit_and_mask (TREE_TYPE (@0), @1, NEGATE_EXPR, @0,
1557 bitop, @2, @3, NULL_TREE, ERROR_MARK,
1558 NULL_TREE, NULL_TREE, pmop); }
1560 (convert (bit_and (negate (convert:utype { pmop[0]; }))
1561 (convert:utype @1)))))))
1563 /* X % Y is smaller than Y. */
1566 (cmp:c (trunc_mod @0 @1) @1)
1567 (if (TYPE_UNSIGNED (TREE_TYPE (@0)))
1568 { constant_boolean_node (cmp == LT_EXPR, type); })))
1572 (bit_ior @0 integer_all_onesp@1)
1577 (bit_ior @0 integer_zerop)
1582 (bit_and @0 integer_zerop@1)
1587 (for op (bit_ior bit_xor)
1589 (op (convert? @0) (convert? @1))
1590 (with { bool wascmp; }
1591 (if (types_match (TREE_TYPE (@0), TREE_TYPE (@1))
1592 && bitwise_inverted_equal_p (@0, @1, wascmp))
1595 ? constant_boolean_node (true, type)
1596 : build_all_ones_cst (TREE_TYPE (@0)); })))))
1601 { build_zero_cst (type); })
1603 /* Canonicalize X ^ ~0 to ~X. */
1605 (bit_xor @0 integer_all_onesp@1)
1610 (bit_and @0 integer_all_onesp)
1613 /* x & x -> x, x | x -> x */
1614 (for bitop (bit_and bit_ior)
1619 /* x & C -> x if we know that x & ~C == 0. */
1622 (bit_and SSA_NAME@0 INTEGER_CST@1)
1623 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1624 && wi::bit_and_not (get_nonzero_bits (@0), wi::to_wide (@1)) == 0)
1627 /* `a & (x | CST)` -> a if we know that (a & ~CST) == 0 */
1629 (bit_and:c SSA_NAME@0 (bit_ior @1 INTEGER_CST@2))
1630 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1631 && wi::bit_and_not (get_nonzero_bits (@0), wi::to_wide (@2)) == 0)
1634 /* x | C -> C if we know that x & ~C == 0. */
1636 (bit_ior SSA_NAME@0 INTEGER_CST@1)
1637 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
1638 && wi::bit_and_not (get_nonzero_bits (@0), wi::to_wide (@1)) == 0)
1642 /* ~(~X - Y) -> X + Y and ~(~X + Y) -> X - Y. */
1644 (bit_not (minus (bit_not @0) @1))
1647 (bit_not (plus:c (bit_not @0) @1))
1649 /* (~X - ~Y) -> Y - X. */
1651 (minus (bit_not @0) (bit_not @1))
1652 (if (!TYPE_OVERFLOW_SANITIZED (type))
1653 (with { tree utype = unsigned_type_for (type); }
1654 (convert (minus (convert:utype @1) (convert:utype @0))))))
1656 /* ~(X - Y) -> ~X + Y. */
1658 (bit_not (minus:s @0 @1))
1659 (plus (bit_not @0) @1))
1661 (bit_not (plus:s @0 INTEGER_CST@1))
1662 (if ((INTEGRAL_TYPE_P (type)
1663 && TYPE_UNSIGNED (type))
1664 || (!TYPE_OVERFLOW_SANITIZED (type)
1665 && may_negate_without_overflow_p (@1)))
1666 (plus (bit_not @0) { const_unop (NEGATE_EXPR, type, @1); })))
1669 /* ~X + Y -> (Y - X) - 1. */
1671 (plus:c (bit_not @0) @1)
1672 (if (ANY_INTEGRAL_TYPE_P (type)
1673 && TYPE_OVERFLOW_WRAPS (type)
1674 /* -1 - X is folded to ~X, so we'd recurse endlessly. */
1675 && !integer_all_onesp (@1))
1676 (plus (minus @1 @0) { build_minus_one_cst (type); })
1677 (if (INTEGRAL_TYPE_P (type)
1678 && TREE_CODE (@1) == INTEGER_CST
1679 && wi::to_wide (@1) != wi::min_value (TYPE_PRECISION (type),
1681 (minus (plus @1 { build_minus_one_cst (type); }) @0))))
1684 /* ~(X >> Y) -> ~X >> Y if ~X can be simplified. */
1686 (bit_not (rshift:s @0 @1))
1687 (if (!TYPE_UNSIGNED (TREE_TYPE (@0)))
1688 (rshift (bit_not! @0) @1)
1689 /* For logical right shifts, this is possible only if @0 doesn't
1690 have MSB set and the logical right shift is changed into
1691 arithmetic shift. */
1692 (if (INTEGRAL_TYPE_P (type)
1693 && !wi::neg_p (tree_nonzero_bits (@0)))
1694 (with { tree stype = signed_type_for (TREE_TYPE (@0)); }
1695 (convert (rshift (bit_not! (convert:stype @0)) @1))))))
1697 /* x + (x & 1) -> (x + 1) & ~1 */
1699 (plus:c @0 (bit_and:s @0 integer_onep@1))
1700 (bit_and (plus @0 @1) (bit_not @1)))
1702 /* x & ~(x & y) -> x & ~y */
1703 /* x | ~(x | y) -> x | ~y */
1704 (for bitop (bit_and bit_ior)
1706 (bitop:c @0 (bit_not (bitop:cs @0 @1)))
1707 (bitop @0 (bit_not @1))))
1709 /* (~x & y) | ~(x | y) -> ~x */
1711 (bit_ior:c (bit_and:c (bit_not@2 @0) @1) (bit_not (bit_ior:c @0 @1)))
1714 /* (x | y) ^ (x | ~y) -> ~x */
1716 (bit_xor:c (bit_ior:c @0 @1) (bit_ior:c @0 (bit_not @1)))
1719 /* (x & y) | ~(x | y) -> ~(x ^ y) */
1721 (bit_ior:c (bit_and:s @0 @1) (bit_not:s (bit_ior:s @0 @1)))
1722 (bit_not (bit_xor @0 @1)))
1724 /* (~x | y) ^ (x ^ y) -> x | ~y */
1726 (bit_xor:c (bit_ior:cs (bit_not @0) @1) (bit_xor:s @0 @1))
1727 (bit_ior @0 (bit_not @1)))
1729 /* (x ^ y) | ~(x | y) -> ~(x & y) */
1731 (bit_ior:c (bit_xor:s @0 @1) (bit_not:s (bit_ior:s @0 @1)))
1732 (bit_not (bit_and @0 @1)))
1734 /* (x & y) ^ (x | y) -> x ^ y */
1736 (bit_xor:c (bit_and @0 @1) (bit_ior @0 @1))
1739 /* (x ^ y) ^ (x | y) -> x & y */
1741 (bit_xor:c (bit_xor @0 @1) (bit_ior @0 @1))
1744 /* (x & y) + (x ^ y) -> x | y */
1745 /* (x & y) | (x ^ y) -> x | y */
1746 /* (x & y) ^ (x ^ y) -> x | y */
1747 (for op (plus bit_ior bit_xor)
1749 (op:c (bit_and @0 @1) (bit_xor @0 @1))
1752 /* (x & y) + (x | y) -> x + y */
1754 (plus:c (bit_and @0 @1) (bit_ior @0 @1))
1757 /* (x + y) - (x | y) -> x & y */
1759 (minus (plus @0 @1) (bit_ior @0 @1))
1760 (if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
1761 && !TYPE_SATURATING (type))
1764 /* (x + y) - (x & y) -> x | y */
1766 (minus (plus @0 @1) (bit_and @0 @1))
1767 (if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
1768 && !TYPE_SATURATING (type))
1771 /* (x | y) - y -> (x & ~y) */
1773 (minus (bit_ior:cs @0 @1) @1)
1774 (bit_and @0 (bit_not @1)))
1776 /* (x | y) - (x ^ y) -> x & y */
1778 (minus (bit_ior @0 @1) (bit_xor @0 @1))
1781 /* (x | y) - (x & y) -> x ^ y */
1783 (minus (bit_ior @0 @1) (bit_and @0 @1))
1786 /* (x | y) & ~(x & y) -> x ^ y */
1788 (bit_and:c (bit_ior @0 @1) (bit_not (bit_and @0 @1)))
1791 /* (x | y) & (~x ^ y) -> x & y */
1793 (bit_and:c (bit_ior:c @0 @1) (bit_xor:c @1 @2))
1794 (with { bool wascmp; }
1795 (if (bitwise_inverted_equal_p (@0, @2, wascmp)
1796 && (!wascmp || element_precision (type) == 1))
1799 /* (~x | y) & (x | ~y) -> ~(x ^ y) */
1801 (bit_and (bit_ior:cs (bit_not @0) @1) (bit_ior:cs @0 (bit_not @1)))
1802 (bit_not (bit_xor @0 @1)))
1804 /* (~x | y) ^ (x | ~y) -> x ^ y */
1806 (bit_xor (bit_ior:c (bit_not @0) @1) (bit_ior:c @0 (bit_not @1)))
1809 /* ((x & y) - (x | y)) - 1 -> ~(x ^ y) */
1811 (plus (nop_convert1? (minus@2 (nop_convert2? (bit_and:c @0 @1))
1812 (nop_convert2? (bit_ior @0 @1))))
1814 (if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
1815 && !TYPE_SATURATING (type) && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2))
1816 && !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@2))
1817 && !TYPE_SATURATING (TREE_TYPE (@2)))
1818 (bit_not (convert (bit_xor @0 @1)))))
1820 (minus (nop_convert1? (plus@2 (nop_convert2? (bit_and:c @0 @1))
1822 (nop_convert3? (bit_ior @0 @1)))
1823 (if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
1824 && !TYPE_SATURATING (type) && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2))
1825 && !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@2))
1826 && !TYPE_SATURATING (TREE_TYPE (@2)))
1827 (bit_not (convert (bit_xor @0 @1)))))
1829 (minus (nop_convert1? (bit_and @0 @1))
1830 (nop_convert2? (plus@2 (nop_convert3? (bit_ior:c @0 @1))
1832 (if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
1833 && !TYPE_SATURATING (type) && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2))
1834 && !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@2))
1835 && !TYPE_SATURATING (TREE_TYPE (@2)))
1836 (bit_not (convert (bit_xor @0 @1)))))
1838 /* ~x & ~y -> ~(x | y)
1839 ~x | ~y -> ~(x & y) */
1840 (for op (bit_and bit_ior)
1841 rop (bit_ior bit_and)
1843 (op (convert1? (bit_not @0)) (convert2? (bit_not @1)))
1844 (if (element_precision (type) <= element_precision (TREE_TYPE (@0))
1845 && element_precision (type) <= element_precision (TREE_TYPE (@1)))
1846 (bit_not (rop (convert @0) (convert @1))))))
1848 /* If we are XORing or adding two BIT_AND_EXPR's, both of which are and'ing
1849 with a constant, and the two constants have no bits in common,
1850 we should treat this as a BIT_IOR_EXPR since this may produce more
1852 (for op (bit_xor plus)
1854 (op (convert1? (bit_and@4 @0 INTEGER_CST@1))
1855 (convert2? (bit_and@5 @2 INTEGER_CST@3)))
1856 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
1857 && tree_nop_conversion_p (type, TREE_TYPE (@2))
1858 && (wi::to_wide (@1) & wi::to_wide (@3)) == 0)
1859 (bit_ior (convert @4) (convert @5)))))
1861 /* (X | Y) ^ X -> Y & ~ X*/
1863 (bit_xor:c (convert1? (bit_ior:c @@0 @1)) (convert2? @0))
1864 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
1865 (convert (bit_and @1 (bit_not @0)))))
1867 /* (~X | Y) ^ X -> ~(X & Y). */
1869 (bit_xor:c (nop_convert1? (bit_ior:c (nop_convert2? (bit_not @0)) @1)) @2)
1870 (if (bitwise_equal_p (@0, @2))
1871 (convert (bit_not (bit_and @0 (convert @1))))))
1873 /* Convert ~X ^ ~Y to X ^ Y. */
1875 (bit_xor (convert1? (bit_not @0)) (convert2? (bit_not @1)))
1876 (if (element_precision (type) <= element_precision (TREE_TYPE (@0))
1877 && element_precision (type) <= element_precision (TREE_TYPE (@1)))
1878 (bit_xor (convert @0) (convert @1))))
1880 /* Convert ~X ^ C to X ^ ~C. */
1882 (bit_xor (convert? (bit_not @0)) INTEGER_CST@1)
1883 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
1884 (bit_xor (convert @0) (bit_not @1))))
1886 /* Fold (X & Y) ^ Y and (X ^ Y) & Y as ~X & Y. */
1887 (for opo (bit_and bit_xor)
1888 opi (bit_xor bit_and)
1890 (opo:c (opi:cs @0 @1) @1)
1891 (bit_and (bit_not @0) @1)))
1893 /* Given a bit-wise operation CODE applied to ARG0 and ARG1, see if both
1894 operands are another bit-wise operation with a common input. If so,
1895 distribute the bit operations to save an operation and possibly two if
1896 constants are involved. For example, convert
1897 (A | B) & (A | C) into A | (B & C)
1898 Further simplification will occur if B and C are constants. */
1899 (for op (bit_and bit_ior bit_xor)
1900 rop (bit_ior bit_and bit_and)
1902 (op (convert? (rop:c @@0 @1)) (convert? (rop:c @0 @2)))
1903 (if (tree_nop_conversion_p (type, TREE_TYPE (@1))
1904 && tree_nop_conversion_p (type, TREE_TYPE (@2)))
1905 (rop (convert @0) (op (convert @1) (convert @2))))))
1907 /* Some simple reassociation for bit operations, also handled in reassoc. */
1908 /* (X & Y) & Y -> X & Y
1909 (X | Y) | Y -> X | Y */
1910 (for op (bit_and bit_ior)
1912 (op:c (convert1?@2 (op:c @0 @@1)) (convert2? @1))
1914 /* (X ^ Y) ^ Y -> X */
1916 (bit_xor:c (convert1? (bit_xor:c @0 @@1)) (convert2? @1))
1919 /* (X & ~Y) & Y -> 0 */
1921 (bit_and:c (bit_and @0 @1) @2)
1922 (with { bool wascmp; }
1923 (if (bitwise_inverted_equal_p (@0, @2, wascmp)
1924 || bitwise_inverted_equal_p (@1, @2, wascmp))
1925 { wascmp ? constant_boolean_node (false, type) : build_zero_cst (type); })))
1926 /* (X | ~Y) | Y -> -1 */
1928 (bit_ior:c (bit_ior @0 @1) @2)
1929 (with { bool wascmp; }
1930 (if ((bitwise_inverted_equal_p (@0, @2, wascmp)
1931 || bitwise_inverted_equal_p (@1, @2, wascmp))
1932 && (!wascmp || element_precision (type) == 1))
1933 { build_all_ones_cst (TREE_TYPE (@0)); })))
1935 /* (X & Y) & (X & Z) -> (X & Y) & Z
1936 (X | Y) | (X | Z) -> (X | Y) | Z */
1937 (for op (bit_and bit_ior)
1939 (op (convert1?@3 (op:c@4 @0 @1)) (convert2?@5 (op:c@6 @0 @2)))
1940 (if (tree_nop_conversion_p (type, TREE_TYPE (@1))
1941 && tree_nop_conversion_p (type, TREE_TYPE (@2)))
1942 (if (single_use (@5) && single_use (@6))
1943 (op @3 (convert @2))
1944 (if (single_use (@3) && single_use (@4))
1945 (op (convert @1) @5))))))
1946 /* (X ^ Y) ^ (X ^ Z) -> Y ^ Z */
1948 (bit_xor (convert1? (bit_xor:c @0 @1)) (convert2? (bit_xor:c @0 @2)))
1949 (if (tree_nop_conversion_p (type, TREE_TYPE (@1))
1950 && tree_nop_conversion_p (type, TREE_TYPE (@2)))
1951 (bit_xor (convert @1) (convert @2))))
1953 /* Convert abs (abs (X)) into abs (X).
1954 also absu (absu (X)) into absu (X). */
1960 (absu (convert@2 (absu@1 @0)))
1961 (if (tree_nop_conversion_p (TREE_TYPE (@2), TREE_TYPE (@1)))
1964 /* Convert abs[u] (-X) -> abs[u] (X). */
1973 /* Convert abs[u] (X) where X is nonnegative -> (X). */
1975 (abs tree_expr_nonnegative_p@0)
1979 (absu tree_expr_nonnegative_p@0)
1982 /* Simplify (-(X < 0) | 1) * X into abs (X) or absu(X). */
1984 (mult:c (nop_convert1?
1985 (bit_ior (nop_convert2? (negate (convert? (lt @0 integer_zerop))))
1988 (if (INTEGRAL_TYPE_P (type)
1989 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
1990 && !TYPE_UNSIGNED (TREE_TYPE (@0)))
1991 (if (TYPE_UNSIGNED (type))
1998 /* A few cases of fold-const.cc negate_expr_p predicate. */
1999 (match negate_expr_p
2001 (if ((INTEGRAL_TYPE_P (type)
2002 && TYPE_UNSIGNED (type))
2003 || (!TYPE_OVERFLOW_SANITIZED (type)
2004 && may_negate_without_overflow_p (t)))))
2005 (match negate_expr_p
2007 (match negate_expr_p
2009 (if (!TYPE_OVERFLOW_SANITIZED (type))))
2010 (match negate_expr_p
2012 (if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (t)))))
2013 /* VECTOR_CST handling of non-wrapping types would recurse in unsupported
2015 (match negate_expr_p
2017 (if (FLOAT_TYPE_P (TREE_TYPE (type)) || TYPE_OVERFLOW_WRAPS (type))))
2018 (match negate_expr_p
2020 (if ((ANY_INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_WRAPS (type))
2021 || (FLOAT_TYPE_P (type)
2022 && !HONOR_SIGN_DEPENDENT_ROUNDING (type)
2023 && !HONOR_SIGNED_ZEROS (type)))))
2025 /* (-A) * (-B) -> A * B */
2027 (mult:c (convert1? (negate @0)) (convert2? negate_expr_p@1))
2028 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
2029 && tree_nop_conversion_p (type, TREE_TYPE (@1)))
2030 (mult (convert @0) (convert (negate @1)))))
2032 /* -(A + B) -> (-B) - A. */
2034 (negate (plus:c @0 negate_expr_p@1))
2035 (if (!HONOR_SIGN_DEPENDENT_ROUNDING (type)
2036 && !HONOR_SIGNED_ZEROS (type))
2037 (minus (negate @1) @0)))
2039 /* -(A - B) -> B - A. */
2041 (negate (minus @0 @1))
2042 (if ((ANY_INTEGRAL_TYPE_P (type) && !TYPE_OVERFLOW_SANITIZED (type))
2043 || (FLOAT_TYPE_P (type)
2044 && !HONOR_SIGN_DEPENDENT_ROUNDING (type)
2045 && !HONOR_SIGNED_ZEROS (type)))
2048 (negate (pointer_diff @0 @1))
2049 (if (TYPE_OVERFLOW_UNDEFINED (type))
2050 (pointer_diff @1 @0)))
2052 /* A - B -> A + (-B) if B is easily negatable. */
2054 (minus @0 negate_expr_p@1)
2055 (if (!FIXED_POINT_TYPE_P (type))
2056 (plus @0 (negate @1))))
2058 /* 1 - a is a ^ 1 if a had a bool range. */
2059 /* This is only enabled for gimple as sometimes
2060 cfun is not set for the function which contains
2061 the SSA_NAME (e.g. while IPA passes are happening,
2062 fold might be called). */
2064 (minus integer_onep@0 SSA_NAME@1)
2065 (if (INTEGRAL_TYPE_P (type)
2066 && ssa_name_has_boolean_range (@1))
2069 /* Other simplifications of negation (c.f. fold_negate_expr_1). */
2071 (negate (mult:c@0 @1 negate_expr_p@2))
2072 (if (! TYPE_UNSIGNED (type)
2073 && ! HONOR_SIGN_DEPENDENT_ROUNDING (type)
2075 (mult @1 (negate @2))))
2078 (negate (rdiv@0 @1 negate_expr_p@2))
2079 (if (! HONOR_SIGN_DEPENDENT_ROUNDING (type)
2081 (rdiv @1 (negate @2))))
2084 (negate (rdiv@0 negate_expr_p@1 @2))
2085 (if (! HONOR_SIGN_DEPENDENT_ROUNDING (type)
2087 (rdiv (negate @1) @2)))
2089 /* Fold -((int)x >> (prec - 1)) into (unsigned)x >> (prec - 1). */
2091 (negate (convert? (rshift @0 INTEGER_CST@1)))
2092 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
2093 && wi::to_wide (@1) == element_precision (type) - 1)
2094 (with { tree stype = TREE_TYPE (@0);
2095 tree ntype = TYPE_UNSIGNED (stype) ? signed_type_for (stype)
2096 : unsigned_type_for (stype); }
2097 (if (VECTOR_TYPE_P (type))
2098 (view_convert (rshift (view_convert:ntype @0) @1))
2099 (convert (rshift (convert:ntype @0) @1))))))
2101 /* Try to fold (type) X op CST -> (type) (X op ((type-x) CST))
2103 For bitwise binary operations apply operand conversions to the
2104 binary operation result instead of to the operands. This allows
2105 to combine successive conversions and bitwise binary operations.
2106 We combine the above two cases by using a conditional convert. */
2107 (for bitop (bit_and bit_ior bit_xor)
2109 (bitop (convert@2 @0) (convert?@3 @1))
2110 (if (((TREE_CODE (@1) == INTEGER_CST
2111 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
2112 && (int_fits_type_p (@1, TREE_TYPE (@0))
2113 || tree_nop_conversion_p (TREE_TYPE (@0), type)))
2114 || types_match (@0, @1))
2115 && !POINTER_TYPE_P (TREE_TYPE (@0))
2116 && !VECTOR_TYPE_P (TREE_TYPE (@0))
2117 && TREE_CODE (TREE_TYPE (@0)) != OFFSET_TYPE
2118 /* ??? This transform conflicts with fold-const.cc doing
2119 Convert (T)(x & c) into (T)x & (T)c, if c is an integer
2120 constants (if x has signed type, the sign bit cannot be set
2121 in c). This folds extension into the BIT_AND_EXPR.
2122 Restrict it to GIMPLE to avoid endless recursions. */
2123 && (bitop != BIT_AND_EXPR || GIMPLE)
2124 && (/* That's a good idea if the conversion widens the operand, thus
2125 after hoisting the conversion the operation will be narrower.
2126 It is also a good if the conversion is a nop as moves the
2127 conversion to one side; allowing for combining of the conversions. */
2128 TYPE_PRECISION (TREE_TYPE (@0)) < TYPE_PRECISION (type)
2129 /* The conversion check for being a nop can only be done at the gimple
2130 level as fold_binary has some re-association code which can conflict
2131 with this if there is a "constant" which is not a full INTEGER_CST. */
2132 || (GIMPLE && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (type))
2133 /* It's also a good idea if the conversion is to a non-integer
2135 || GET_MODE_CLASS (TYPE_MODE (type)) != MODE_INT
2136 /* Or if the precision of TO is not the same as the precision
2138 || !type_has_mode_precision_p (type)
2139 /* In GIMPLE, getting rid of 2 conversions for one new results
2142 && TREE_CODE (@1) != INTEGER_CST
2143 && tree_nop_conversion_p (type, TREE_TYPE (@0))
2145 && single_use (@3))))
2146 (convert (bitop @0 (convert @1)))))
2147 /* In GIMPLE, getting rid of 2 conversions for one new results
2150 (convert (bitop:cs@2 (nop_convert:s @0) @1))
2152 && TREE_CODE (@1) != INTEGER_CST
2153 && tree_nop_conversion_p (type, TREE_TYPE (@2))
2154 && types_match (type, @0)
2155 && !POINTER_TYPE_P (TREE_TYPE (@0))
2156 && TREE_CODE (TREE_TYPE (@0)) != OFFSET_TYPE)
2157 (bitop @0 (convert @1)))))
2159 (for bitop (bit_and bit_ior)
2160 rbitop (bit_ior bit_and)
2161 /* (x | y) & x -> x */
2162 /* (x & y) | x -> x */
2164 (bitop:c (rbitop:c @0 @1) @0)
2166 /* (~x | y) & x -> x & y */
2167 /* (~x & y) | x -> x | y */
2169 (bitop:c (rbitop:c @2 @1) @0)
2170 (with { bool wascmp; }
2171 (if (bitwise_inverted_equal_p (@0, @2, wascmp)
2172 && (!wascmp || element_precision (type) == 1))
2174 /* (x | y) & (x & z) -> (x & z) */
2175 /* (x & y) | (x | z) -> (x | z) */
2177 (bitop:c (rbitop:c @0 @1) (bitop:c@3 @0 @2))
2179 /* (x | c) & ~(y | c) -> x & ~(y | c) */
2180 /* (x & c) | ~(y & c) -> x | ~(y & c) */
2182 (bitop:c (rbitop:c @0 @1) (bit_not@3 (rbitop:c @1 @2)))
2184 /* x & ~(y | x) -> 0 */
2185 /* x | ~(y & x) -> -1 */
2187 (bitop:c @0 (bit_not (rbitop:c @0 @1)))
2188 (if (bitop == BIT_AND_EXPR)
2189 { build_zero_cst (type); }
2190 { build_minus_one_cst (type); })))
2192 /* ((x | y) & z) | x -> (z & y) | x
2193 ((x ^ y) & z) | x -> (z & y) | x */
2194 (for op (bit_ior bit_xor)
2196 (bit_ior:c (nop_convert1?:s
2197 (bit_and:cs (nop_convert2?:s (op:cs @0 @1)) @2)) @3)
2198 (if (bitwise_equal_p (@0, @3))
2199 (convert (bit_ior (bit_and @1 (convert @2)) (convert @0))))))
2201 /* (x | CST1) & CST2 -> (x & CST2) | (CST1 & CST2) */
2203 (bit_and (bit_ior @0 CONSTANT_CLASS_P@1) CONSTANT_CLASS_P@2)
2204 (bit_ior (bit_and @0 @2) (bit_and! @1 @2)))
2206 /* Combine successive equal operations with constants. */
2207 (for bitop (bit_and bit_ior bit_xor)
2209 (bitop (bitop @0 CONSTANT_CLASS_P@1) CONSTANT_CLASS_P@2)
2210 (if (!CONSTANT_CLASS_P (@0))
2211 /* This is the canonical form regardless of whether (bitop @1 @2) can be
2212 folded to a constant. */
2213 (bitop @0 (bitop! @1 @2))
2214 /* In this case we have three constants and (bitop @0 @1) doesn't fold
2215 to a constant. This can happen if @0 or @1 is a POLY_INT_CST and if
2216 the values involved are such that the operation can't be decided at
2217 compile time. Try folding one of @0 or @1 with @2 to see whether
2218 that combination can be decided at compile time.
2220 Keep the existing form if both folds fail, to avoid endless
2222 (with { tree cst1 = const_binop (bitop, type, @0, @2); }
2224 (bitop @1 { cst1; })
2225 (with { tree cst2 = const_binop (bitop, type, @1, @2); }
2227 (bitop @0 { cst2; }))))))))
2229 /* Try simple folding for X op !X, and X op X with the help
2230 of the truth_valued_p and logical_inverted_value predicates. */
2231 (match truth_valued_p
2233 (if (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) == 1)))
2234 (for op (tcc_comparison truth_and truth_andif truth_or truth_orif truth_xor)
2235 (match truth_valued_p
2237 (match truth_valued_p
2240 (match (logical_inverted_value @0)
2242 (match (logical_inverted_value @0)
2243 (bit_not truth_valued_p@0))
2244 (match (logical_inverted_value @0)
2245 (eq @0 integer_zerop))
2246 (match (logical_inverted_value @0)
2247 (ne truth_valued_p@0 integer_truep))
2248 (match (logical_inverted_value @0)
2249 (bit_xor truth_valued_p@0 integer_truep))
2253 (bit_and:c @0 (logical_inverted_value @0))
2254 { build_zero_cst (type); })
2255 /* X | !X and X ^ !X -> 1, , if X is truth-valued. */
2256 (for op (bit_ior bit_xor)
2258 (op:c truth_valued_p@0 (logical_inverted_value @0))
2259 { constant_boolean_node (true, type); }))
2260 /* X ==/!= !X is false/true. */
2263 (op:c truth_valued_p@0 (logical_inverted_value @0))
2264 { constant_boolean_node (op == NE_EXPR ? true : false, type); }))
2268 (bit_not (bit_not @0))
2271 /* zero_one_valued_p will match when a value is known to be either
2272 0 or 1 including constants 0 or 1.
2273 Signed 1-bits includes -1 so they cannot match here. */
2274 (match zero_one_valued_p
2276 (if (INTEGRAL_TYPE_P (type)
2277 && (TYPE_UNSIGNED (type)
2278 || TYPE_PRECISION (type) > 1)
2279 && wi::leu_p (tree_nonzero_bits (@0), 1))))
2280 (match zero_one_valued_p
2282 (if (INTEGRAL_TYPE_P (type)
2283 && (TYPE_UNSIGNED (type)
2284 || TYPE_PRECISION (type) > 1))))
2286 /* (a&1) is always [0,1] too. This is useful again when
2287 the range is not known. */
2288 /* Note this can't be recursive due to VN handling of equivalents,
2289 VN and would cause an infinite recursion. */
2290 (match zero_one_valued_p
2291 (bit_and:c@0 @1 integer_onep)
2292 (if (INTEGRAL_TYPE_P (type))))
2294 /* A conversion from an zero_one_valued_p is still a [0,1].
2295 This is useful when the range of a variable is not known */
2296 /* Note this matches can't be recursive because of the way VN handles
2297 nop conversions being equivalent and then recursive between them. */
2298 (match zero_one_valued_p
2300 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
2301 && (TYPE_UNSIGNED (TREE_TYPE (@1))
2302 || TYPE_PRECISION (TREE_TYPE (@1)) > 1)
2303 && INTEGRAL_TYPE_P (type)
2304 && (TYPE_UNSIGNED (type)
2305 || TYPE_PRECISION (type) > 1)
2306 && wi::leu_p (tree_nonzero_bits (@1), 1))))
2308 /* Transform { 0 or 1 } * { 0 or 1 } into { 0 or 1 } & { 0 or 1 }. */
2310 (mult zero_one_valued_p@0 zero_one_valued_p@1)
2311 (if (INTEGRAL_TYPE_P (type))
2314 (for cmp (tcc_comparison)
2315 icmp (inverted_tcc_comparison)
2316 /* Fold (((a < b) & c) | ((a >= b) & d)) into (a < b ? c : d) & 1. */
2319 (bit_and:c (convert? (cmp@0 @01 @02)) @3)
2320 (bit_and:c (convert? (icmp@4 @01 @02)) @5))
2321 (if (INTEGRAL_TYPE_P (type)
2322 && invert_tree_comparison (cmp, HONOR_NANS (@01)) == icmp
2323 /* The scalar version has to be canonicalized after vectorization
2324 because it makes unconditional loads conditional ones, which
2325 means we lose vectorization because the loads may trap. */
2326 && canonicalize_math_after_vectorization_p ())
2327 (bit_and (cond @0 @3 @5) { build_one_cst (type); })))
2329 /* Fold ((-(a < b) & c) | (-(a >= b) & d)) into a < b ? c : d. This is
2330 canonicalized further and we recognize the conditional form:
2331 (a < b ? c : 0) | (a >= b ? d : 0) into a < b ? c : d. */
2334 (cond (cmp@0 @01 @02) @3 zerop)
2335 (cond (icmp@4 @01 @02) @5 zerop))
2336 (if (INTEGRAL_TYPE_P (type)
2337 && invert_tree_comparison (cmp, HONOR_NANS (@01)) == icmp
2338 /* The scalar version has to be canonicalized after vectorization
2339 because it makes unconditional loads conditional ones, which
2340 means we lose vectorization because the loads may trap. */
2341 && canonicalize_math_after_vectorization_p ())
2344 /* Vector Fold (((a < b) & c) | ((a >= b) & d)) into a < b ? c : d.
2345 and ((~(a < b) & c) | (~(a >= b) & d)) into a < b ? c : d. */
2348 (bit_and:c (vec_cond:s (cmp@0 @6 @7) @4 @5) @2)
2349 (bit_and:c (vec_cond:s (icmp@1 @6 @7) @4 @5) @3))
2350 (if (integer_zerop (@5)
2351 && invert_tree_comparison (cmp, HONOR_NANS (@6)) == icmp)
2353 (if (integer_onep (@4))
2354 (bit_and (vec_cond @0 @2 @3) @4))
2355 (if (integer_minus_onep (@4))
2356 (vec_cond @0 @2 @3)))
2357 (if (integer_zerop (@4)
2358 && invert_tree_comparison (cmp, HONOR_NANS (@6)) == icmp)
2360 (if (integer_onep (@5))
2361 (bit_and (vec_cond @0 @3 @2) @5))
2362 (if (integer_minus_onep (@5))
2363 (vec_cond @0 @3 @2))))))
2365 /* Scalar Vectorized Fold ((-(a < b) & c) | (-(a >= b) & d))
2366 into a < b ? d : c. */
2369 (vec_cond:s (cmp@0 @4 @5) @2 integer_zerop)
2370 (vec_cond:s (icmp@1 @4 @5) @3 integer_zerop))
2371 (if (invert_tree_comparison (cmp, HONOR_NANS (@4)) == icmp)
2372 (vec_cond @0 @2 @3))))
2374 /* Transform X & -Y into X * Y when Y is { 0 or 1 }. */
2376 (bit_and:c (convert? (negate zero_one_valued_p@0)) @1)
2377 (if (INTEGRAL_TYPE_P (type)
2378 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
2379 && TREE_CODE (TREE_TYPE (@0)) != BOOLEAN_TYPE
2380 /* Sign extending of the neg or a truncation of the neg
2382 && (!TYPE_UNSIGNED (TREE_TYPE (@0))
2383 || TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))))
2384 (mult (convert @0) @1)))
2386 /* Narrow integer multiplication by a zero_one_valued_p operand.
2387 Multiplication by [0,1] is guaranteed not to overflow. */
2389 (convert (mult@0 zero_one_valued_p@1 INTEGER_CST@2))
2390 (if (INTEGRAL_TYPE_P (type)
2391 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
2392 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (@0)))
2393 (mult (convert @1) (convert @2))))
2395 /* (X << C) != 0 can be simplified to X, when C is zero_one_valued_p.
2396 Check that the shift is well-defined (C is less than TYPE_PRECISION)
2397 as some targets (such as x86's SSE) may return zero for larger C. */
2399 (ne (lshift zero_one_valued_p@0 INTEGER_CST@1) integer_zerop@2)
2400 (if (tree_fits_shwi_p (@1)
2401 && tree_to_shwi (@1) > 0
2402 && tree_to_shwi (@1) < TYPE_PRECISION (TREE_TYPE (@0)))
2405 /* (X << C) == 0 can be simplified to X == 0, when C is zero_one_valued_p.
2406 Check that the shift is well-defined (C is less than TYPE_PRECISION)
2407 as some targets (such as x86's SSE) may return zero for larger C. */
2409 (eq (lshift zero_one_valued_p@0 INTEGER_CST@1) integer_zerop@2)
2410 (if (tree_fits_shwi_p (@1)
2411 && tree_to_shwi (@1) > 0
2412 && tree_to_shwi (@1) < TYPE_PRECISION (TREE_TYPE (@0)))
2415 /* Convert ~ (-A) to A - 1. */
2417 (bit_not (convert? (negate @0)))
2418 (if (element_precision (type) <= element_precision (TREE_TYPE (@0))
2419 || !TYPE_UNSIGNED (TREE_TYPE (@0)))
2420 (convert (minus @0 { build_each_one_cst (TREE_TYPE (@0)); }))))
2422 /* Convert - (~A) to A + 1. */
2424 (negate (nop_convert? (bit_not @0)))
2425 (plus (view_convert @0) { build_each_one_cst (type); }))
2427 /* (a & b) ^ (a == b) -> !(a | b) */
2428 /* (a & b) == (a ^ b) -> !(a | b) */
2429 (for first_op (bit_xor eq)
2430 second_op (eq bit_xor)
2432 (first_op:c (bit_and:c truth_valued_p@0 truth_valued_p@1) (second_op:c @0 @1))
2433 (bit_not (bit_ior @0 @1))))
2435 /* Convert ~ (A - 1) or ~ (A + -1) to -A. */
2437 (bit_not (convert? (minus @0 integer_each_onep)))
2438 (if (element_precision (type) <= element_precision (TREE_TYPE (@0))
2439 || !TYPE_UNSIGNED (TREE_TYPE (@0)))
2440 (convert (negate @0))))
2442 (bit_not (convert? (plus @0 integer_all_onesp)))
2443 (if (element_precision (type) <= element_precision (TREE_TYPE (@0))
2444 || !TYPE_UNSIGNED (TREE_TYPE (@0)))
2445 (convert (negate @0))))
2447 /* Part of convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */
2449 (bit_not (convert? (bit_xor @0 INTEGER_CST@1)))
2450 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
2451 (convert (bit_xor @0 (bit_not @1)))))
2453 (bit_not (convert? (bit_xor:c (bit_not @0) @1)))
2454 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
2455 (convert (bit_xor @0 @1))))
2457 /* Otherwise prefer ~(X ^ Y) to ~X ^ Y as more canonical. */
2459 (bit_xor:c (nop_convert?:s (bit_not:s @0)) @1)
2460 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
2461 (bit_not (bit_xor (view_convert @0) @1))))
2463 /* ~(a ^ b) is a == b for truth valued a and b. */
2465 (bit_not (bit_xor:s truth_valued_p@0 truth_valued_p@1))
2466 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
2467 && TYPE_PRECISION (TREE_TYPE (@0)) == 1)
2468 (convert (eq @0 @1))))
2470 /* (~a) == b is a ^ b for truth valued a and b. */
2472 (eq:c (bit_not:s truth_valued_p@0) truth_valued_p@1)
2473 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
2474 && TYPE_PRECISION (TREE_TYPE (@0)) == 1)
2475 (convert (bit_xor @0 @1))))
2477 /* (x & ~m) | (y & m) -> ((x ^ y) & m) ^ x */
2479 (bit_ior:c (bit_and:cs @0 (bit_not @2)) (bit_and:cs @1 @2))
2480 (bit_xor (bit_and (bit_xor @0 @1) @2) @0))
2482 /* Fold A - (A & B) into ~B & A. */
2484 (minus (convert1? @0) (convert2?:s (bit_and:cs @@0 @1)))
2485 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
2486 && tree_nop_conversion_p (type, TREE_TYPE (@1)))
2487 (convert (bit_and (bit_not @1) @0))))
2489 /* (m1 CMP m2) * d -> (m1 CMP m2) ? d : 0 */
2490 (if (!canonicalize_math_p ())
2491 (for cmp (tcc_comparison)
2493 (mult:c (convert (cmp@0 @1 @2)) @3)
2494 (if (INTEGRAL_TYPE_P (type)
2495 && INTEGRAL_TYPE_P (TREE_TYPE (@0)))
2496 (cond @0 @3 { build_zero_cst (type); })))
2497 /* (-(m1 CMP m2)) & d -> (m1 CMP m2) ? d : 0 */
2499 (bit_and:c (negate (convert (cmp@0 @1 @2))) @3)
2500 (if (INTEGRAL_TYPE_P (type)
2501 && INTEGRAL_TYPE_P (TREE_TYPE (@0)))
2502 (cond @0 @3 { build_zero_cst (type); })))
2506 /* For integral types with undefined overflow and C != 0 fold
2507 x * C EQ/NE y * C into x EQ/NE y. */
2510 (cmp (mult:c @0 @1) (mult:c @2 @1))
2511 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
2512 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
2513 && tree_expr_nonzero_p (@1))
2516 /* For integral types with wrapping overflow and C odd fold
2517 x * C EQ/NE y * C into x EQ/NE y. */
2520 (cmp (mult @0 INTEGER_CST@1) (mult @2 @1))
2521 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
2522 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))
2523 && (TREE_INT_CST_LOW (@1) & 1) != 0)
2526 /* For integral types with undefined overflow and C != 0 fold
2527 x * C RELOP y * C into:
2529 x RELOP y for nonnegative C
2530 y RELOP x for negative C */
2531 (for cmp (lt gt le ge)
2533 (cmp (mult:c @0 @1) (mult:c @2 @1))
2534 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
2535 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
2536 (if (tree_expr_nonnegative_p (@1) && tree_expr_nonzero_p (@1))
2538 (if (TREE_CODE (@1) == INTEGER_CST
2539 && wi::neg_p (wi::to_wide (@1), TYPE_SIGN (TREE_TYPE (@1))))
2542 /* (X - 1U) <= INT_MAX-1U into (int) X > 0. */
2546 (cmp (plus @0 integer_minus_onep@1) INTEGER_CST@2)
2547 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
2548 && TYPE_UNSIGNED (TREE_TYPE (@0))
2549 && TYPE_PRECISION (TREE_TYPE (@0)) > 1
2550 && (wi::to_wide (@2)
2551 == wi::max_value (TYPE_PRECISION (TREE_TYPE (@0)), SIGNED) - 1))
2552 (with { tree stype = signed_type_for (TREE_TYPE (@0)); }
2553 (icmp (convert:stype @0) { build_int_cst (stype, 0); })))))
2555 /* X / 4 < Y / 4 iff X < Y when the division is known to be exact. */
2556 (for cmp (simple_comparison)
2558 (cmp (convert?@3 (exact_div @0 INTEGER_CST@2)) (convert? (exact_div @1 @2)))
2559 (if (element_precision (@3) >= element_precision (@0)
2560 && types_match (@0, @1))
2561 (if (wi::lt_p (wi::to_wide (@2), 0, TYPE_SIGN (TREE_TYPE (@2))))
2562 (if (!TYPE_UNSIGNED (TREE_TYPE (@3)))
2564 (if (tree_expr_nonzero_p (@0) && tree_expr_nonzero_p (@1))
2567 tree utype = unsigned_type_for (TREE_TYPE (@0));
2569 (cmp (convert:utype @1) (convert:utype @0)))))
2570 (if (wi::gt_p (wi::to_wide (@2), 1, TYPE_SIGN (TREE_TYPE (@2))))
2571 (if (TYPE_UNSIGNED (TREE_TYPE (@0)) || !TYPE_UNSIGNED (TREE_TYPE (@3)))
2575 tree utype = unsigned_type_for (TREE_TYPE (@0));
2577 (cmp (convert:utype @0) (convert:utype @1)))))))))
2579 /* X / C1 op C2 into a simple range test. */
2580 (for cmp (simple_comparison)
2582 (cmp (trunc_div:s @0 INTEGER_CST@1) INTEGER_CST@2)
2583 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
2584 && integer_nonzerop (@1)
2585 && !TREE_OVERFLOW (@1)
2586 && !TREE_OVERFLOW (@2))
2587 (with { tree lo, hi; bool neg_overflow;
2588 enum tree_code code = fold_div_compare (cmp, @1, @2, &lo, &hi,
2591 (if (code == LT_EXPR || code == GE_EXPR)
2592 (if (TREE_OVERFLOW (lo))
2593 { build_int_cst (type, (code == LT_EXPR) ^ neg_overflow); }
2594 (if (code == LT_EXPR)
2597 (if (code == LE_EXPR || code == GT_EXPR)
2598 (if (TREE_OVERFLOW (hi))
2599 { build_int_cst (type, (code == LE_EXPR) ^ neg_overflow); }
2600 (if (code == LE_EXPR)
2604 { build_int_cst (type, code == NE_EXPR); })
2605 (if (code == EQ_EXPR && !hi)
2607 (if (code == EQ_EXPR && !lo)
2609 (if (code == NE_EXPR && !hi)
2611 (if (code == NE_EXPR && !lo)
2614 { build_range_check (UNKNOWN_LOCATION, type, @0, code == EQ_EXPR,
2618 tree etype = range_check_type (TREE_TYPE (@0));
2621 hi = fold_convert (etype, hi);
2622 lo = fold_convert (etype, lo);
2623 hi = const_binop (MINUS_EXPR, etype, hi, lo);
2626 (if (etype && hi && !TREE_OVERFLOW (hi))
2627 (if (code == EQ_EXPR)
2628 (le (minus (convert:etype @0) { lo; }) { hi; })
2629 (gt (minus (convert:etype @0) { lo; }) { hi; })))))))))
2631 /* X + Z < Y + Z is the same as X < Y when there is no overflow. */
2632 (for op (lt le ge gt)
2634 (op (plus:c @0 @2) (plus:c @1 @2))
2635 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2636 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
2639 /* As a special case, X + C < Y + C is the same as (signed) X < (signed) Y
2640 when C is an unsigned integer constant with only the MSB set, and X and
2641 Y have types of equal or lower integer conversion rank than C's. */
2642 (for op (lt le ge gt)
2644 (op (plus @1 INTEGER_CST@0) (plus @2 @0))
2645 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
2646 && TYPE_UNSIGNED (TREE_TYPE (@0))
2647 && wi::only_sign_bit_p (wi::to_wide (@0)))
2648 (with { tree stype = signed_type_for (TREE_TYPE (@0)); }
2649 (op (convert:stype @1) (convert:stype @2))))))
2651 /* For equality and subtraction, this is also true with wrapping overflow. */
2652 (for op (eq ne minus)
2654 (op (plus:c @0 @2) (plus:c @1 @2))
2655 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2656 && (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
2657 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
2659 /* And similar for pointers. */
2662 (op (pointer_plus @0 @1) (pointer_plus @0 @2))
2665 (pointer_diff (pointer_plus @0 @1) (pointer_plus @0 @2))
2666 (if (TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
2667 (convert (minus @1 @2))))
2669 /* X - Z < Y - Z is the same as X < Y when there is no overflow. */
2670 (for op (lt le ge gt)
2672 (op (minus @0 @2) (minus @1 @2))
2673 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2674 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
2676 /* For equality and subtraction, this is also true with wrapping overflow. */
2677 (for op (eq ne minus)
2679 (op (minus @0 @2) (minus @1 @2))
2680 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2681 && (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
2682 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
2684 /* And for pointers... */
2685 (for op (simple_comparison)
2687 (op (pointer_diff@3 @0 @2) (pointer_diff @1 @2))
2688 (if (!TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
2691 (minus (pointer_diff@3 @0 @2) (pointer_diff @1 @2))
2692 (if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@3))
2693 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
2694 (pointer_diff @0 @1)))
2696 /* Z - X < Z - Y is the same as Y < X when there is no overflow. */
2697 (for op (lt le ge gt)
2699 (op (minus @2 @0) (minus @2 @1))
2700 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2701 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
2703 /* For equality and subtraction, this is also true with wrapping overflow. */
2704 (for op (eq ne minus)
2706 (op (minus @2 @0) (minus @2 @1))
2707 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2708 && (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
2709 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
2711 /* And for pointers... */
2712 (for op (simple_comparison)
2714 (op (pointer_diff@3 @2 @0) (pointer_diff @2 @1))
2715 (if (!TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
2718 (minus (pointer_diff@3 @2 @0) (pointer_diff @2 @1))
2719 (if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@3))
2720 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
2721 (pointer_diff @1 @0)))
2723 /* X + Y < Y is the same as X < 0 when there is no overflow. */
2724 (for op (lt le gt ge)
2726 (op:c (plus:c@2 @0 @1) @1)
2727 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2728 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
2729 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@0))
2730 && (CONSTANT_CLASS_P (@0) || single_use (@2)))
2731 (op @0 { build_zero_cst (TREE_TYPE (@0)); }))))
2732 /* For equality, this is also true with wrapping overflow. */
2735 (op:c (nop_convert?@3 (plus:c@2 @0 (convert1? @1))) (convert2? @1))
2736 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2737 && (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
2738 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
2739 && (CONSTANT_CLASS_P (@0) || (single_use (@2) && single_use (@3)))
2740 && tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@2))
2741 && tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@1)))
2742 (op @0 { build_zero_cst (TREE_TYPE (@0)); })))
2744 (op:c (nop_convert?@3 (pointer_plus@2 (convert1? @0) @1)) (convert2? @0))
2745 (if (tree_nop_conversion_p (TREE_TYPE (@2), TREE_TYPE (@0))
2746 && tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@0))
2747 && (CONSTANT_CLASS_P (@1) || (single_use (@2) && single_use (@3))))
2748 (op @1 { build_zero_cst (TREE_TYPE (@1)); }))))
2750 /* (&a + b) !=/== (&a[1] + c) -> (&a[0] - &a[1]) + b !=/== c */
2753 (neeq:c ADDR_EXPR@0 (pointer_plus @2 @3))
2754 (with { poly_int64 diff; tree inner_type = TREE_TYPE (@3);}
2755 (if (ptr_difference_const (@0, @2, &diff))
2756 (neeq { build_int_cst_type (inner_type, diff); } @3))))
2758 (neeq (pointer_plus ADDR_EXPR@0 @1) (pointer_plus ADDR_EXPR@2 @3))
2759 (with { poly_int64 diff; tree inner_type = TREE_TYPE (@1);}
2760 (if (ptr_difference_const (@0, @2, &diff))
2761 (neeq (plus { build_int_cst_type (inner_type, diff); } @1) @3)))))
2763 /* X - Y < X is the same as Y > 0 when there is no overflow.
2764 For equality, this is also true with wrapping overflow. */
2765 (for op (simple_comparison)
2767 (op:c @0 (minus@2 @0 @1))
2768 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
2769 && (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
2770 || ((op == EQ_EXPR || op == NE_EXPR)
2771 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
2772 && (CONSTANT_CLASS_P (@1) || single_use (@2)))
2773 (op @1 { build_zero_cst (TREE_TYPE (@1)); }))))
2776 (X / Y) == 0 -> X < Y if X, Y are unsigned.
2777 (X / Y) != 0 -> X >= Y, if X, Y are unsigned. */
2781 (cmp (trunc_div @0 @1) integer_zerop)
2782 (if (TYPE_UNSIGNED (TREE_TYPE (@0))
2783 /* Complex ==/!= is allowed, but not </>=. */
2784 && TREE_CODE (TREE_TYPE (@0)) != COMPLEX_TYPE
2785 && (VECTOR_TYPE_P (type) || !VECTOR_TYPE_P (TREE_TYPE (@0))))
2788 /* X == C - X can never be true if C is odd. */
2791 (cmp:c (convert? @0) (convert1? (minus INTEGER_CST@1 (convert2? @0))))
2792 (if (TREE_INT_CST_LOW (@1) & 1)
2793 { constant_boolean_node (cmp == NE_EXPR, type); })))
2798 U needs to be non-negative.
2802 U and N needs to be non-negative
2806 U needs to be non-negative and N needs to be a negative constant.
2808 (for cmp (lt ge le gt )
2809 bitop (bit_ior bit_ior bit_and bit_and)
2811 (cmp:c (bitop:c tree_expr_nonnegative_p@0 @1) @0)
2812 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)))
2813 (if (bitop == BIT_AND_EXPR || tree_expr_nonnegative_p (@1))
2814 { constant_boolean_node (cmp == GE_EXPR || cmp == LE_EXPR, type); }
2815 /* The sign is opposite now so the comparison is swapped around. */
2816 (if (TREE_CODE (@1) == INTEGER_CST && wi::neg_p (wi::to_wide (@1)))
2817 { constant_boolean_node (cmp == LT_EXPR, type); })))))
2819 /* Arguments on which one can call get_nonzero_bits to get the bits
2821 (match with_possible_nonzero_bits
2823 (match with_possible_nonzero_bits
2825 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))))
2826 /* Slightly extended version, do not make it recursive to keep it cheap. */
2827 (match (with_possible_nonzero_bits2 @0)
2828 with_possible_nonzero_bits@0)
2829 (match (with_possible_nonzero_bits2 @0)
2830 (bit_and:c with_possible_nonzero_bits@0 @2))
2832 /* Same for bits that are known to be set, but we do not have
2833 an equivalent to get_nonzero_bits yet. */
2834 (match (with_certain_nonzero_bits2 @0)
2836 (match (with_certain_nonzero_bits2 @0)
2837 (bit_ior @1 INTEGER_CST@0))
2839 /* X == C (or X & Z == Y | C) is impossible if ~nonzero(X) & C != 0. */
2842 (cmp:c (with_possible_nonzero_bits2 @0) (with_certain_nonzero_bits2 @1))
2843 (if (wi::bit_and_not (wi::to_wide (@1), get_nonzero_bits (@0)) != 0)
2844 { constant_boolean_node (cmp == NE_EXPR, type); })))
2846 /* ((X inner_op C0) outer_op C1)
2847 With X being a tree where value_range has reasoned certain bits to always be
2848 zero throughout its computed value range,
2849 inner_op = {|,^}, outer_op = {|,^} and inner_op != outer_op
2850 where zero_mask has 1's for all bits that are sure to be 0 in
2852 if (inner_op == '^') C0 &= ~C1;
2853 if ((C0 & ~zero_mask) == 0) then emit (X outer_op (C0 outer_op C1)
2854 if ((C1 & ~zero_mask) == 0) then emit (X inner_op (C0 outer_op C1)
2856 (for inner_op (bit_ior bit_xor)
2857 outer_op (bit_xor bit_ior)
2860 (inner_op:s @2 INTEGER_CST@0) INTEGER_CST@1)
2864 wide_int zero_mask_not;
2868 if (TREE_CODE (@2) == SSA_NAME)
2869 zero_mask_not = get_nonzero_bits (@2);
2873 if (inner_op == BIT_XOR_EXPR)
2875 C0 = wi::bit_and_not (wi::to_wide (@0), wi::to_wide (@1));
2876 cst_emit = C0 | wi::to_wide (@1);
2880 C0 = wi::to_wide (@0);
2881 cst_emit = C0 ^ wi::to_wide (@1);
2884 (if (!fail && (C0 & zero_mask_not) == 0)
2885 (outer_op @2 { wide_int_to_tree (type, cst_emit); })
2886 (if (!fail && (wi::to_wide (@1) & zero_mask_not) == 0)
2887 (inner_op @2 { wide_int_to_tree (type, cst_emit); }))))))
2889 /* Associate (p +p off1) +p off2 as (p +p (off1 + off2)). */
2891 (pointer_plus (pointer_plus:s @0 @1) @3)
2892 (pointer_plus @0 (plus @1 @3)))
2895 (pointer_plus (convert:s (pointer_plus:s @0 @1)) @3)
2896 (convert:type (pointer_plus @0 (plus @1 @3))))
2903 tem4 = (unsigned long) tem3;
2908 (pointer_plus @0 (convert?@2 (minus@3 (convert @1) (convert @0))))
2909 /* Conditionally look through a sign-changing conversion. */
2910 (if (TYPE_PRECISION (TREE_TYPE (@2)) == TYPE_PRECISION (TREE_TYPE (@3))
2911 && ((GIMPLE && useless_type_conversion_p (type, TREE_TYPE (@1)))
2912 || (GENERIC && type == TREE_TYPE (@1))))
2915 (pointer_plus @0 (convert?@2 (pointer_diff@3 @1 @@0)))
2916 (if (TYPE_PRECISION (TREE_TYPE (@2)) >= TYPE_PRECISION (TREE_TYPE (@3)))
2920 tem = (sizetype) ptr;
2924 and produce the simpler and easier to analyze with respect to alignment
2925 ... = ptr & ~algn; */
2927 (pointer_plus @0 (negate (bit_and (convert @0) INTEGER_CST@1)))
2928 (with { tree algn = wide_int_to_tree (TREE_TYPE (@0), ~wi::to_wide (@1)); }
2929 (bit_and @0 { algn; })))
2931 /* Try folding difference of addresses. */
2933 (minus (convert ADDR_EXPR@0) (convert (pointer_plus @1 @2)))
2934 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
2935 (with { poly_int64 diff; }
2936 (if (ptr_difference_const (@0, @1, &diff))
2937 (minus { build_int_cst_type (type, diff); } (convert @2))))))
2939 (minus (convert (pointer_plus @0 @2)) (convert ADDR_EXPR@1))
2940 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
2941 (with { poly_int64 diff; }
2942 (if (ptr_difference_const (@0, @1, &diff))
2943 (plus (convert @2) { build_int_cst_type (type, diff); })))))
2945 (minus (convert ADDR_EXPR@0) (convert @1))
2946 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
2947 (with { poly_int64 diff; }
2948 (if (ptr_difference_const (@0, @1, &diff))
2949 { build_int_cst_type (type, diff); }))))
2951 (minus (convert @0) (convert ADDR_EXPR@1))
2952 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
2953 (with { poly_int64 diff; }
2954 (if (ptr_difference_const (@0, @1, &diff))
2955 { build_int_cst_type (type, diff); }))))
2957 (pointer_diff (convert?@2 ADDR_EXPR@0) (convert1?@3 @1))
2958 (if (tree_nop_conversion_p (TREE_TYPE(@2), TREE_TYPE (@0))
2959 && tree_nop_conversion_p (TREE_TYPE(@3), TREE_TYPE (@1)))
2960 (with { poly_int64 diff; }
2961 (if (ptr_difference_const (@0, @1, &diff))
2962 { build_int_cst_type (type, diff); }))))
2964 (pointer_diff (convert?@2 @0) (convert1?@3 ADDR_EXPR@1))
2965 (if (tree_nop_conversion_p (TREE_TYPE(@2), TREE_TYPE (@0))
2966 && tree_nop_conversion_p (TREE_TYPE(@3), TREE_TYPE (@1)))
2967 (with { poly_int64 diff; }
2968 (if (ptr_difference_const (@0, @1, &diff))
2969 { build_int_cst_type (type, diff); }))))
2971 /* (&a+b) - (&a[1] + c) -> sizeof(a[0]) + (b - c) */
2973 (pointer_diff (pointer_plus ADDR_EXPR@0 @1) (pointer_plus ADDR_EXPR@2 @3))
2974 (with { poly_int64 diff; }
2975 (if (ptr_difference_const (@0, @2, &diff))
2976 (plus { build_int_cst_type (type, diff); } (convert (minus @1 @3))))))
2977 /* (p + b) - &p->d -> offsetof (*p, d) + b */
2979 (pointer_diff (pointer_plus @0 @1) ADDR_EXPR@2)
2980 (with { poly_int64 diff; }
2981 (if (ptr_difference_const (@0, @2, &diff))
2982 (plus { build_int_cst_type (type, diff); } (convert @1)))))
2984 (pointer_diff ADDR_EXPR@0 (pointer_plus @1 @2))
2985 (with { poly_int64 diff; }
2986 (if (ptr_difference_const (@0, @1, &diff))
2987 (minus { build_int_cst_type (type, diff); } (convert @2)))))
2989 /* Canonicalize (T *)(ptr - ptr-cst) to &MEM[ptr + -ptr-cst]. */
2991 (convert (pointer_diff @0 INTEGER_CST@1))
2992 (if (POINTER_TYPE_P (type))
2993 { build_fold_addr_expr_with_type
2994 (build2 (MEM_REF, char_type_node, @0,
2995 wide_int_to_tree (ptr_type_node, wi::neg (wi::to_wide (@1)))),
2998 /* If arg0 is derived from the address of an object or function, we may
2999 be able to fold this expression using the object or function's
3002 (bit_and (convert? @0) INTEGER_CST@1)
3003 (if (POINTER_TYPE_P (TREE_TYPE (@0))
3004 && tree_nop_conversion_p (type, TREE_TYPE (@0)))
3008 unsigned HOST_WIDE_INT bitpos;
3009 get_pointer_alignment_1 (@0, &align, &bitpos);
3011 (if (wi::ltu_p (wi::to_wide (@1), align / BITS_PER_UNIT))
3012 { wide_int_to_tree (type, (wi::to_wide (@1)
3013 & (bitpos / BITS_PER_UNIT))); }))))
3016 uniform_integer_cst_p
3018 tree int_cst = uniform_integer_cst_p (t);
3019 tree inner_type = TREE_TYPE (int_cst);
3021 (if ((INTEGRAL_TYPE_P (inner_type)
3022 || POINTER_TYPE_P (inner_type))
3023 && wi::eq_p (wi::to_wide (int_cst), wi::min_value (inner_type))))))
3026 uniform_integer_cst_p
3028 tree int_cst = uniform_integer_cst_p (t);
3029 tree itype = TREE_TYPE (int_cst);
3031 (if ((INTEGRAL_TYPE_P (itype)
3032 || POINTER_TYPE_P (itype))
3033 && wi::eq_p (wi::to_wide (int_cst), wi::max_value (itype))))))
3035 /* x > y && x != XXX_MIN --> x > y
3036 x > y && x == XXX_MIN --> false . */
3039 (bit_and:c (gt:c@2 @0 @1) (eqne @0 min_value))
3041 (if (eqne == EQ_EXPR)
3042 { constant_boolean_node (false, type); })
3043 (if (eqne == NE_EXPR)
3047 /* x < y && x != XXX_MAX --> x < y
3048 x < y && x == XXX_MAX --> false. */
3051 (bit_and:c (lt:c@2 @0 @1) (eqne @0 max_value))
3053 (if (eqne == EQ_EXPR)
3054 { constant_boolean_node (false, type); })
3055 (if (eqne == NE_EXPR)
3059 /* x <= y && x == XXX_MIN --> x == XXX_MIN. */
3061 (bit_and:c (le:c @0 @1) (eq@2 @0 min_value))
3064 /* x >= y && x == XXX_MAX --> x == XXX_MAX. */
3066 (bit_and:c (ge:c @0 @1) (eq@2 @0 max_value))
3069 /* x > y || x != XXX_MIN --> x != XXX_MIN. */
3071 (bit_ior:c (gt:c @0 @1) (ne@2 @0 min_value))
3074 /* x <= y || x != XXX_MIN --> true. */
3076 (bit_ior:c (le:c @0 @1) (ne @0 min_value))
3077 { constant_boolean_node (true, type); })
3079 /* x <= y || x == XXX_MIN --> x <= y. */
3081 (bit_ior:c (le:c@2 @0 @1) (eq @0 min_value))
3084 /* x < y || x != XXX_MAX --> x != XXX_MAX. */
3086 (bit_ior:c (lt:c @0 @1) (ne@2 @0 max_value))
3089 /* x >= y || x != XXX_MAX --> true
3090 x >= y || x == XXX_MAX --> x >= y. */
3093 (bit_ior:c (ge:c@2 @0 @1) (eqne @0 max_value))
3095 (if (eqne == EQ_EXPR)
3097 (if (eqne == NE_EXPR)
3098 { constant_boolean_node (true, type); }))))
3100 /* y == XXX_MIN || x < y --> x <= y - 1 */
3102 (bit_ior:c (eq:s @1 min_value) (lt:cs @0 @1))
3103 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
3104 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
3105 (le @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))
3107 /* y != XXX_MIN && x >= y --> x > y - 1 */
3109 (bit_and:c (ne:s @1 min_value) (ge:cs @0 @1))
3110 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
3111 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
3112 (gt @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))
3114 /* Convert (X == CST1) && ((other)X OP2 CST2) to a known value
3115 based on CST1 OP2 CST2. Similarly for (X != CST1). */
3116 /* Convert (X == Y) && (X OP2 Y) to a known value if X is an integral type.
3117 Similarly for (X != Y). */
3120 (for code2 (eq ne lt gt le ge)
3122 (bit_and:c (code1:c@3 @0 @1) (code2:c@4 (convert?@c0 @0) @2))
3123 (if ((TREE_CODE (@1) == INTEGER_CST
3124 && TREE_CODE (@2) == INTEGER_CST)
3125 || ((INTEGRAL_TYPE_P (TREE_TYPE (@1))
3126 || POINTER_TYPE_P (TREE_TYPE (@1)))
3127 && bitwise_equal_p (@1, @2)))
3130 bool one_before = false;
3131 bool one_after = false;
3133 bool allbits = true;
3134 if (TREE_CODE (@1) == INTEGER_CST
3135 && TREE_CODE (@2) == INTEGER_CST)
3137 allbits = TYPE_PRECISION (TREE_TYPE (@1)) <= TYPE_PRECISION (TREE_TYPE (@2));
3138 auto t1 = wi::to_wide (fold_convert (TREE_TYPE (@2), @1));
3139 auto t2 = wi::to_wide (@2);
3140 cmp = wi::cmp (t1, t2, TYPE_SIGN (TREE_TYPE (@2)));
3151 case EQ_EXPR: val = (cmp == 0); break;
3152 case NE_EXPR: val = (cmp != 0); break;
3153 case LT_EXPR: val = (cmp < 0); break;
3154 case GT_EXPR: val = (cmp > 0); break;
3155 case LE_EXPR: val = (cmp <= 0); break;
3156 case GE_EXPR: val = (cmp >= 0); break;
3157 default: gcc_unreachable ();
3161 (if (code1 == EQ_EXPR && val) @3)
3162 (if (code1 == EQ_EXPR && !val) { constant_boolean_node (false, type); })
3163 (if (code1 == NE_EXPR && !val && allbits) @4)
3164 (if (code1 == NE_EXPR
3168 (gt @c0 (convert @1)))
3169 (if (code1 == NE_EXPR
3173 (lt @c0 (convert @1)))
3174 /* (a != (b+1)) & (a > b) -> a > (b+1) */
3175 (if (code1 == NE_EXPR
3179 (gt @c0 (convert @1)))
3180 /* (a != (b-1)) & (a < b) -> a < (b-1) */
3181 (if (code1 == NE_EXPR
3185 (lt @c0 (convert @1)))
3193 /* Convert (X OP1 CST1) && (X OP2 CST2).
3194 Convert (X OP1 Y) && (X OP2 Y). */
3196 (for code1 (lt le gt ge)
3197 (for code2 (lt le gt ge)
3199 (bit_and (code1:c@3 @0 @1) (code2:c@4 @0 @2))
3200 (if ((TREE_CODE (@1) == INTEGER_CST
3201 && TREE_CODE (@2) == INTEGER_CST)
3202 || ((INTEGRAL_TYPE_P (TREE_TYPE (@1))
3203 || POINTER_TYPE_P (TREE_TYPE (@1)))
3204 && operand_equal_p (@1, @2)))
3208 if (TREE_CODE (@1) == INTEGER_CST
3209 && TREE_CODE (@2) == INTEGER_CST)
3210 cmp = tree_int_cst_compare (@1, @2);
3213 /* Choose the more restrictive of two < or <= comparisons. */
3214 (if ((code1 == LT_EXPR || code1 == LE_EXPR)
3215 && (code2 == LT_EXPR || code2 == LE_EXPR))
3216 (if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR))
3219 /* Likewise chose the more restrictive of two > or >= comparisons. */
3220 (if ((code1 == GT_EXPR || code1 == GE_EXPR)
3221 && (code2 == GT_EXPR || code2 == GE_EXPR))
3222 (if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR))
3225 /* Check for singleton ranges. */
3227 && ((code1 == LE_EXPR && code2 == GE_EXPR)
3228 || (code1 == GE_EXPR && code2 == LE_EXPR)))
3230 /* Check for disjoint ranges. */
3232 && (code1 == LT_EXPR || code1 == LE_EXPR)
3233 && (code2 == GT_EXPR || code2 == GE_EXPR))
3234 { constant_boolean_node (false, type); })
3236 && (code1 == GT_EXPR || code1 == GE_EXPR)
3237 && (code2 == LT_EXPR || code2 == LE_EXPR))
3238 { constant_boolean_node (false, type); })
3241 /* Convert (X == CST1) || (X OP2 CST2) to a known value
3242 based on CST1 OP2 CST2. Similarly for (X != CST1). */
3243 /* Convert (X == Y) || (X OP2 Y) to a known value if X is an integral type.
3244 Similarly for (X != Y). */
3247 (for code2 (eq ne lt gt le ge)
3249 (bit_ior:c (code1:c@3 @0 @1) (code2:c@4 (convert?@c0 @0) @2))
3250 (if ((TREE_CODE (@1) == INTEGER_CST
3251 && TREE_CODE (@2) == INTEGER_CST)
3252 || ((INTEGRAL_TYPE_P (TREE_TYPE (@1))
3253 || POINTER_TYPE_P (TREE_TYPE (@1)))
3254 && bitwise_equal_p (@1, @2)))
3257 bool one_before = false;
3258 bool one_after = false;
3260 bool allbits = true;
3261 if (TREE_CODE (@1) == INTEGER_CST
3262 && TREE_CODE (@2) == INTEGER_CST)
3264 allbits = TYPE_PRECISION (TREE_TYPE (@1)) <= TYPE_PRECISION (TREE_TYPE (@2));
3265 auto t1 = wi::to_wide (fold_convert (TREE_TYPE (@2), @1));
3266 auto t2 = wi::to_wide (@2);
3267 cmp = wi::cmp (t1, t2, TYPE_SIGN (TREE_TYPE (@2)));
3278 case EQ_EXPR: val = (cmp == 0); break;
3279 case NE_EXPR: val = (cmp != 0); break;
3280 case LT_EXPR: val = (cmp < 0); break;
3281 case GT_EXPR: val = (cmp > 0); break;
3282 case LE_EXPR: val = (cmp <= 0); break;
3283 case GE_EXPR: val = (cmp >= 0); break;
3284 default: gcc_unreachable ();
3288 (if (code1 == EQ_EXPR && val) @4)
3289 (if (code1 == NE_EXPR && val && allbits) { constant_boolean_node (true, type); })
3290 (if (code1 == NE_EXPR && !val && allbits) @3)
3291 (if (code1 == EQ_EXPR
3296 (if (code1 == EQ_EXPR
3301 /* (a == (b-1)) | (a >= b) -> a >= (b-1) */
3302 (if (code1 == EQ_EXPR
3306 (ge @c0 (convert @1)))
3307 /* (a == (b+1)) | (a <= b) -> a <= (b-1) */
3308 (if (code1 == EQ_EXPR
3312 (le @c0 (convert @1)))
3320 /* Convert (X OP1 CST1) || (X OP2 CST2).
3321 Convert (X OP1 Y) || (X OP2 Y). */
3323 (for code1 (lt le gt ge)
3324 (for code2 (lt le gt ge)
3326 (bit_ior (code1@3 @0 @1) (code2@4 @0 @2))
3327 (if ((TREE_CODE (@1) == INTEGER_CST
3328 && TREE_CODE (@2) == INTEGER_CST)
3329 || ((INTEGRAL_TYPE_P (TREE_TYPE (@1))
3330 || POINTER_TYPE_P (TREE_TYPE (@1)))
3331 && operand_equal_p (@1, @2)))
3335 if (TREE_CODE (@1) == INTEGER_CST
3336 && TREE_CODE (@2) == INTEGER_CST)
3337 cmp = tree_int_cst_compare (@1, @2);
3340 /* Choose the more restrictive of two < or <= comparisons. */
3341 (if ((code1 == LT_EXPR || code1 == LE_EXPR)
3342 && (code2 == LT_EXPR || code2 == LE_EXPR))
3343 (if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR))
3346 /* Likewise chose the more restrictive of two > or >= comparisons. */
3347 (if ((code1 == GT_EXPR || code1 == GE_EXPR)
3348 && (code2 == GT_EXPR || code2 == GE_EXPR))
3349 (if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR))
3352 /* Check for singleton ranges. */
3354 && ((code1 == LT_EXPR && code2 == GT_EXPR)
3355 || (code1 == GT_EXPR && code2 == LT_EXPR)))
3357 /* Check for disjoint ranges. */
3359 && (code1 == LT_EXPR || code1 == LE_EXPR)
3360 && (code2 == GT_EXPR || code2 == GE_EXPR))
3361 { constant_boolean_node (true, type); })
3363 && (code1 == GT_EXPR || code1 == GE_EXPR)
3364 && (code2 == LT_EXPR || code2 == LE_EXPR))
3365 { constant_boolean_node (true, type); })
3368 /* Optimize (a CMP b) ^ (a CMP b) */
3369 /* Optimize (a CMP b) != (a CMP b) */
3370 (for op (bit_xor ne)
3371 (for cmp1 (lt lt lt le le le)
3372 cmp2 (gt eq ne ge eq ne)
3373 rcmp (ne le gt ne lt ge)
3375 (op:c (cmp1:c @0 @1) (cmp2:c @0 @1))
3376 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))
3379 /* Optimize (a CMP b) == (a CMP b) */
3380 (for cmp1 (lt lt lt le le le)
3381 cmp2 (gt eq ne ge eq ne)
3382 rcmp (eq gt le eq ge lt)
3384 (eq:c (cmp1:c @0 @1) (cmp2:c @0 @1))
3385 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))
3388 /* (type)([0,1]@a != 0) -> (type)a
3389 (type)([0,1]@a == 1) -> (type)a
3390 (type)([0,1]@a == 0) -> a ^ 1
3391 (type)([0,1]@a != 1) -> a ^ 1. */
3394 (convert (eqne zero_one_valued_p@0 INTEGER_CST@1))
3395 (if ((integer_zerop (@1) || integer_onep (@1)))
3396 (if ((eqne == EQ_EXPR) ^ integer_zerop (@1))
3398 /* Only do this if the types match as (type)(a == 0) is
3399 canonical form normally, while `a ^ 1` is canonical when
3400 there is no type change. */
3401 (if (types_match (type, TREE_TYPE (@0)))
3402 (bit_xor @0 { build_one_cst (type); } ))))))
3404 /* We can't reassociate at all for saturating types. */
3405 (if (!TYPE_SATURATING (type))
3407 /* Contract negates. */
3408 /* A + (-B) -> A - B */
3410 (plus:c @0 (convert? (negate @1)))
3411 /* Apply STRIP_NOPS on the negate. */
3412 (if (tree_nop_conversion_p (type, TREE_TYPE (@1))
3413 && !TYPE_OVERFLOW_SANITIZED (type))
3417 if (INTEGRAL_TYPE_P (type)
3418 && TYPE_OVERFLOW_WRAPS (type) != TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
3419 t1 = TYPE_OVERFLOW_WRAPS (type) ? type : TREE_TYPE (@1);
3421 (convert (minus (convert:t1 @0) (convert:t1 @1))))))
3422 /* A - (-B) -> A + B */
3424 (minus @0 (convert? (negate @1)))
3425 (if (tree_nop_conversion_p (type, TREE_TYPE (@1))
3426 && !TYPE_OVERFLOW_SANITIZED (type))
3430 if (INTEGRAL_TYPE_P (type)
3431 && TYPE_OVERFLOW_WRAPS (type) != TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
3432 t1 = TYPE_OVERFLOW_WRAPS (type) ? type : TREE_TYPE (@1);
3434 (convert (plus (convert:t1 @0) (convert:t1 @1))))))
3436 Sign-extension is ok except for INT_MIN, which thankfully cannot
3437 happen without overflow. */
3439 (negate (convert (negate @1)))
3440 (if (INTEGRAL_TYPE_P (type)
3441 && (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@1))
3442 || (!TYPE_UNSIGNED (TREE_TYPE (@1))
3443 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@1))))
3444 && !TYPE_OVERFLOW_SANITIZED (type)
3445 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@1)))
3448 (negate (convert negate_expr_p@1))
3449 (if (SCALAR_FLOAT_TYPE_P (type)
3450 && ((DECIMAL_FLOAT_TYPE_P (type)
3451 == DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@1))
3452 && TYPE_PRECISION (type) >= TYPE_PRECISION (TREE_TYPE (@1)))
3453 || !HONOR_SIGN_DEPENDENT_ROUNDING (type)))
3454 (convert (negate @1))))
3456 (negate (nop_convert? (negate @1)))
3457 (if (!TYPE_OVERFLOW_SANITIZED (type)
3458 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@1)))
3461 /* We can't reassociate floating-point unless -fassociative-math
3462 or fixed-point plus or minus because of saturation to +-Inf. */
3463 (if ((!FLOAT_TYPE_P (type) || flag_associative_math)
3464 && !FIXED_POINT_TYPE_P (type))
3466 /* Match patterns that allow contracting a plus-minus pair
3467 irrespective of overflow issues. */
3468 /* (A +- B) - A -> +- B */
3469 /* (A +- B) -+ B -> A */
3470 /* A - (A +- B) -> -+ B */
3471 /* A +- (B -+ A) -> +- B */
3473 (minus (nop_convert1? (plus:c (nop_convert2? @0) @1)) @0)
3476 (minus (nop_convert1? (minus (nop_convert2? @0) @1)) @0)
3477 (if (!ANY_INTEGRAL_TYPE_P (type)
3478 || TYPE_OVERFLOW_WRAPS (type))
3479 (negate (view_convert @1))
3480 (view_convert (negate @1))))
3482 (plus:c (nop_convert1? (minus @0 (nop_convert2? @1))) @1)
3485 (minus @0 (nop_convert1? (plus:c (nop_convert2? @0) @1)))
3486 (if (!ANY_INTEGRAL_TYPE_P (type)
3487 || TYPE_OVERFLOW_WRAPS (type))
3488 (negate (view_convert @1))
3489 (view_convert (negate @1))))
3491 (minus @0 (nop_convert1? (minus (nop_convert2? @0) @1)))
3493 /* (A +- B) + (C - A) -> C +- B */
3494 /* (A + B) - (A - C) -> B + C */
3495 /* More cases are handled with comparisons. */
3497 (plus:c (plus:c @0 @1) (minus @2 @0))
3500 (plus:c (minus @0 @1) (minus @2 @0))
3503 (plus:c (pointer_diff @0 @1) (pointer_diff @2 @0))
3504 (if (TYPE_OVERFLOW_UNDEFINED (type)
3505 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@0)))
3506 (pointer_diff @2 @1)))
3508 (minus (plus:c @0 @1) (minus @0 @2))
3511 /* (A +- CST1) +- CST2 -> A + CST3
3512 Use view_convert because it is safe for vectors and equivalent for
3514 (for outer_op (plus minus)
3515 (for inner_op (plus minus)
3516 neg_inner_op (minus plus)
3518 (outer_op (nop_convert? (inner_op @0 CONSTANT_CLASS_P@1))
3520 /* If one of the types wraps, use that one. */
3521 (if (!ANY_INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_WRAPS (type))
3522 /* If all 3 captures are CONSTANT_CLASS_P, punt, as we might recurse
3523 forever if something doesn't simplify into a constant. */
3524 (if (!CONSTANT_CLASS_P (@0))
3525 (if (outer_op == PLUS_EXPR)
3526 (plus (view_convert @0) (inner_op! @2 (view_convert @1)))
3527 (minus (view_convert @0) (neg_inner_op! @2 (view_convert @1)))))
3528 (if (!ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
3529 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
3530 (if (outer_op == PLUS_EXPR)
3531 (view_convert (plus @0 (inner_op! (view_convert @2) @1)))
3532 (view_convert (minus @0 (neg_inner_op! (view_convert @2) @1))))
3533 /* If the constant operation overflows we cannot do the transform
3534 directly as we would introduce undefined overflow, for example
3535 with (a - 1) + INT_MIN. */
3536 (if (types_match (type, @0) && !TYPE_OVERFLOW_SANITIZED (type))
3537 (with { tree cst = const_binop (outer_op == inner_op
3538 ? PLUS_EXPR : MINUS_EXPR,
3541 (if (INTEGRAL_TYPE_P (type) && !TREE_OVERFLOW (cst))
3542 (inner_op @0 { cst; } )
3543 /* X+INT_MAX+1 is X-INT_MIN. */
3544 (if (INTEGRAL_TYPE_P (type)
3545 && wi::to_wide (cst) == wi::min_value (type))
3546 (neg_inner_op @0 { wide_int_to_tree (type, wi::to_wide (cst)); })
3547 /* Last resort, use some unsigned type. */
3548 (with { tree utype = unsigned_type_for (type); }
3550 (view_convert (inner_op
3551 (view_convert:utype @0)
3553 { TREE_OVERFLOW (cst)
3554 ? drop_tree_overflow (cst) : cst; })))))))))))))))
3556 /* (CST1 - A) +- CST2 -> CST3 - A */
3557 (for outer_op (plus minus)
3559 (outer_op (nop_convert? (minus CONSTANT_CLASS_P@1 @0)) CONSTANT_CLASS_P@2)
3560 /* If one of the types wraps, use that one. */
3561 (if (!ANY_INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_WRAPS (type))
3562 /* If all 3 captures are CONSTANT_CLASS_P, punt, as we might recurse
3563 forever if something doesn't simplify into a constant. */
3564 (if (!CONSTANT_CLASS_P (@0))
3565 (minus (outer_op! (view_convert @1) @2) (view_convert @0)))
3566 (if (!ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
3567 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
3568 (view_convert (minus (outer_op! @1 (view_convert @2)) @0))
3569 (if (types_match (type, @0) && !TYPE_OVERFLOW_SANITIZED (type))
3570 (with { tree cst = const_binop (outer_op, type, @1, @2); }
3571 (if (cst && !TREE_OVERFLOW (cst))
3572 (minus { cst; } @0))))))))
3574 /* CST1 - (CST2 - A) -> CST3 + A
3575 Use view_convert because it is safe for vectors and equivalent for
3578 (minus CONSTANT_CLASS_P@1 (nop_convert? (minus CONSTANT_CLASS_P@2 @0)))
3579 /* If one of the types wraps, use that one. */
3580 (if (!ANY_INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_WRAPS (type))
3581 /* If all 3 captures are CONSTANT_CLASS_P, punt, as we might recurse
3582 forever if something doesn't simplify into a constant. */
3583 (if (!CONSTANT_CLASS_P (@0))
3584 (plus (view_convert @0) (minus! @1 (view_convert @2))))
3585 (if (!ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
3586 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
3587 (view_convert (plus @0 (minus! (view_convert @1) @2)))
3588 (if (types_match (type, @0) && !TYPE_OVERFLOW_SANITIZED (type))
3589 (with { tree cst = const_binop (MINUS_EXPR, type, @1, @2); }
3590 (if (cst && !TREE_OVERFLOW (cst))
3591 (plus { cst; } @0)))))))
3593 /* ((T)(A)) + CST -> (T)(A + CST) */
3596 (plus (convert:s SSA_NAME@0) INTEGER_CST@1)
3597 (if (TREE_CODE (TREE_TYPE (@0)) == INTEGER_TYPE
3598 && TREE_CODE (type) == INTEGER_TYPE
3599 && TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (@0))
3600 && int_fits_type_p (@1, TREE_TYPE (@0)))
3601 /* Perform binary operation inside the cast if the constant fits
3602 and (A + CST)'s range does not overflow. */
3605 wi::overflow_type min_ovf = wi::OVF_OVERFLOW,
3606 max_ovf = wi::OVF_OVERFLOW;
3607 tree inner_type = TREE_TYPE (@0);
3610 = wide_int::from (wi::to_wide (@1), TYPE_PRECISION (inner_type),
3611 TYPE_SIGN (inner_type));
3614 if (get_global_range_query ()->range_of_expr (vr, @0)
3615 && !vr.varying_p () && !vr.undefined_p ())
3617 wide_int wmin0 = vr.lower_bound ();
3618 wide_int wmax0 = vr.upper_bound ();
3619 wi::add (wmin0, w1, TYPE_SIGN (inner_type), &min_ovf);
3620 wi::add (wmax0, w1, TYPE_SIGN (inner_type), &max_ovf);
3623 (if (min_ovf == wi::OVF_NONE && max_ovf == wi::OVF_NONE)
3624 (convert (plus @0 { wide_int_to_tree (TREE_TYPE (@0), w1); } )))
3628 /* ((T)(A + CST1)) + CST2 -> (T)(A) + (T)CST1 + CST2 */
3630 (for op (plus minus)
3632 (plus (convert:s (op:s @0 INTEGER_CST@1)) INTEGER_CST@2)
3633 (if (TREE_CODE (TREE_TYPE (@0)) == INTEGER_TYPE
3634 && TREE_CODE (type) == INTEGER_TYPE
3635 && TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (@0))
3636 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
3637 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@0))
3638 && TYPE_OVERFLOW_WRAPS (type))
3639 (plus (convert @0) (op @2 (convert @1))))))
3642 /* (T)(A) +- (T)(B) -> (T)(A +- B) only when (A +- B) could be simplified
3643 to a simple value. */
3644 (for op (plus minus)
3646 (op (convert @0) (convert @1))
3647 (if (INTEGRAL_TYPE_P (type)
3648 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
3649 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))
3650 && types_match (TREE_TYPE (@0), TREE_TYPE (@1))
3651 && !TYPE_OVERFLOW_TRAPS (type)
3652 && !TYPE_OVERFLOW_SANITIZED (type))
3653 (convert (op! @0 @1)))))
3657 (plus:c (convert? (bit_not @0)) (convert? @0))
3658 (if (!TYPE_OVERFLOW_TRAPS (type))
3659 (convert { build_all_ones_cst (TREE_TYPE (@0)); })))
3663 (plus (convert? (bit_not @0)) integer_each_onep)
3664 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
3665 (negate (convert @0))))
3669 (minus (convert? (negate @0)) integer_each_onep)
3670 (if (!TYPE_OVERFLOW_TRAPS (type)
3671 && TREE_CODE (type) != COMPLEX_TYPE
3672 && tree_nop_conversion_p (type, TREE_TYPE (@0)))
3673 (bit_not (convert @0))))
3677 (minus integer_all_onesp @0)
3678 (if (TREE_CODE (type) != COMPLEX_TYPE)
3681 /* (T)(P + A) - (T)P -> (T) A */
3683 (minus (convert (plus:c @@0 @1))
3685 (if (element_precision (type) <= element_precision (TREE_TYPE (@1))
3686 /* For integer types, if A has a smaller type
3687 than T the result depends on the possible
3689 E.g. T=size_t, A=(unsigned)429497295, P>0.
3690 However, if an overflow in P + A would cause
3691 undefined behavior, we can assume that there
3693 || (INTEGRAL_TYPE_P (TREE_TYPE (@1))
3694 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@1))))
3697 (minus (convert (pointer_plus @@0 @1))
3699 (if (element_precision (type) <= element_precision (TREE_TYPE (@1))
3700 /* For pointer types, if the conversion of A to the
3701 final type requires a sign- or zero-extension,
3702 then we have to punt - it is not defined which
3704 || (POINTER_TYPE_P (TREE_TYPE (@0))
3705 && TREE_CODE (@1) == INTEGER_CST
3706 && tree_int_cst_sign_bit (@1) == 0))
3709 (pointer_diff (pointer_plus @@0 @1) @0)
3710 /* The second argument of pointer_plus must be interpreted as signed, and
3711 thus sign-extended if necessary. */
3712 (with { tree stype = signed_type_for (TREE_TYPE (@1)); }
3713 /* Use view_convert instead of convert here, as POINTER_PLUS_EXPR
3714 second arg is unsigned even when we need to consider it as signed,
3715 we don't want to diagnose overflow here. */
3716 (convert (view_convert:stype @1))))
3718 /* (T)P - (T)(P + A) -> -(T) A */
3720 (minus (convert? @0)
3721 (convert (plus:c @@0 @1)))
3722 (if (INTEGRAL_TYPE_P (type)
3723 && TYPE_OVERFLOW_UNDEFINED (type)
3724 /* For integer literals, using an intermediate unsigned type to avoid
3725 an overflow at run time is counter-productive because it introduces
3726 spurious overflows at compile time, in the form of TREE_OVERFLOW on
3727 the result, which may be problematic in GENERIC for some front-ends:
3728 (T)P - (T)(P + 4) -> (T)(-(U)4) -> (T)(4294967292) -> -4(OVF)
3729 so we use the direct path for them. */
3730 && TREE_CODE (@1) != INTEGER_CST
3731 && element_precision (type) <= element_precision (TREE_TYPE (@1)))
3732 (with { tree utype = unsigned_type_for (type); }
3733 (convert (negate (convert:utype @1))))
3734 (if (element_precision (type) <= element_precision (TREE_TYPE (@1))
3735 /* For integer types, if A has a smaller type
3736 than T the result depends on the possible
3738 E.g. T=size_t, A=(unsigned)429497295, P>0.
3739 However, if an overflow in P + A would cause
3740 undefined behavior, we can assume that there
3742 || (INTEGRAL_TYPE_P (TREE_TYPE (@1))
3743 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@1))))
3744 (negate (convert @1)))))
3747 (convert (pointer_plus @@0 @1)))
3748 (if (INTEGRAL_TYPE_P (type)
3749 && TYPE_OVERFLOW_UNDEFINED (type)
3750 /* See above the rationale for this condition. */
3751 && TREE_CODE (@1) != INTEGER_CST
3752 && element_precision (type) <= element_precision (TREE_TYPE (@1)))
3753 (with { tree utype = unsigned_type_for (type); }
3754 (convert (negate (convert:utype @1))))
3755 (if (element_precision (type) <= element_precision (TREE_TYPE (@1))
3756 /* For pointer types, if the conversion of A to the
3757 final type requires a sign- or zero-extension,
3758 then we have to punt - it is not defined which
3760 || (POINTER_TYPE_P (TREE_TYPE (@0))
3761 && TREE_CODE (@1) == INTEGER_CST
3762 && tree_int_cst_sign_bit (@1) == 0))
3763 (negate (convert @1)))))
3765 (pointer_diff @0 (pointer_plus @@0 @1))
3766 /* The second argument of pointer_plus must be interpreted as signed, and
3767 thus sign-extended if necessary. */
3768 (with { tree stype = signed_type_for (TREE_TYPE (@1)); }
3769 /* Use view_convert instead of convert here, as POINTER_PLUS_EXPR
3770 second arg is unsigned even when we need to consider it as signed,
3771 we don't want to diagnose overflow here. */
3772 (negate (convert (view_convert:stype @1)))))
3774 /* (T)(P + A) - (T)(P + B) -> (T)A - (T)B */
3776 (minus (convert (plus:c @@0 @1))
3777 (convert (plus:c @0 @2)))
3778 (if (INTEGRAL_TYPE_P (type)
3779 && TYPE_OVERFLOW_UNDEFINED (type)
3780 && element_precision (type) <= element_precision (TREE_TYPE (@1))
3781 && element_precision (type) <= element_precision (TREE_TYPE (@2)))
3782 (with { tree utype = unsigned_type_for (type); }
3783 (convert (minus (convert:utype @1) (convert:utype @2))))
3784 (if (((element_precision (type) <= element_precision (TREE_TYPE (@1)))
3785 == (element_precision (type) <= element_precision (TREE_TYPE (@2))))
3786 && (element_precision (type) <= element_precision (TREE_TYPE (@1))
3787 /* For integer types, if A has a smaller type
3788 than T the result depends on the possible
3790 E.g. T=size_t, A=(unsigned)429497295, P>0.
3791 However, if an overflow in P + A would cause
3792 undefined behavior, we can assume that there
3794 || (INTEGRAL_TYPE_P (TREE_TYPE (@1))
3795 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
3796 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@1))
3797 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@2)))))
3798 (minus (convert @1) (convert @2)))))
3800 (minus (convert (pointer_plus @@0 @1))
3801 (convert (pointer_plus @0 @2)))
3802 (if (INTEGRAL_TYPE_P (type)
3803 && TYPE_OVERFLOW_UNDEFINED (type)
3804 && element_precision (type) <= element_precision (TREE_TYPE (@1)))
3805 (with { tree utype = unsigned_type_for (type); }
3806 (convert (minus (convert:utype @1) (convert:utype @2))))
3807 (if (element_precision (type) <= element_precision (TREE_TYPE (@1))
3808 /* For pointer types, if the conversion of A to the
3809 final type requires a sign- or zero-extension,
3810 then we have to punt - it is not defined which
3812 || (POINTER_TYPE_P (TREE_TYPE (@0))
3813 && TREE_CODE (@1) == INTEGER_CST
3814 && tree_int_cst_sign_bit (@1) == 0
3815 && TREE_CODE (@2) == INTEGER_CST
3816 && tree_int_cst_sign_bit (@2) == 0))
3817 (minus (convert @1) (convert @2)))))
3819 (pointer_diff (pointer_plus @0 @2) (pointer_plus @1 @2))
3820 (pointer_diff @0 @1))
3822 (pointer_diff (pointer_plus @@0 @1) (pointer_plus @0 @2))
3823 /* The second argument of pointer_plus must be interpreted as signed, and
3824 thus sign-extended if necessary. */
3825 (with { tree stype = signed_type_for (TREE_TYPE (@1)); }
3826 /* Use view_convert instead of convert here, as POINTER_PLUS_EXPR
3827 second arg is unsigned even when we need to consider it as signed,
3828 we don't want to diagnose overflow here. */
3829 (minus (convert (view_convert:stype @1))
3830 (convert (view_convert:stype @2)))))))
3832 /* (A * C) +- (B * C) -> (A+-B) * C and (A * C) +- A -> A * (C+-1).
3833 Modeled after fold_plusminus_mult_expr. */
3834 (if (!TYPE_SATURATING (type)
3835 && (!FLOAT_TYPE_P (type) || flag_associative_math))
3836 (for plusminus (plus minus)
3838 (plusminus (mult:cs@3 @0 @1) (mult:cs@4 @0 @2))
3839 (if (!ANY_INTEGRAL_TYPE_P (type)
3840 || TYPE_OVERFLOW_WRAPS (type)
3841 || (INTEGRAL_TYPE_P (type)
3842 && tree_expr_nonzero_p (@0)
3843 && expr_not_equal_to (@0, wi::minus_one (TYPE_PRECISION (type)))))
3844 (if (single_use (@3) || single_use (@4))
3845 /* If @1 +- @2 is constant require a hard single-use on either
3846 original operand (but not on both). */
3847 (mult (plusminus @1 @2) @0)
3848 (mult! (plusminus @1 @2) @0)
3850 /* We cannot generate constant 1 for fract. */
3851 (if (!ALL_FRACT_MODE_P (TYPE_MODE (type)))
3853 (plusminus @0 (mult:c@3 @0 @2))
3854 (if ((!ANY_INTEGRAL_TYPE_P (type)
3855 || TYPE_OVERFLOW_WRAPS (type)
3856 /* For @0 + @0*@2 this transformation would introduce UB
3857 (where there was none before) for @0 in [-1,0] and @2 max.
3858 For @0 - @0*@2 this transformation would introduce UB
3859 for @0 0 and @2 in [min,min+1] or @0 -1 and @2 min+1. */
3860 || (INTEGRAL_TYPE_P (type)
3861 && ((tree_expr_nonzero_p (@0)
3862 && expr_not_equal_to (@0,
3863 wi::minus_one (TYPE_PRECISION (type))))
3864 || (plusminus == PLUS_EXPR
3865 ? expr_not_equal_to (@2,
3866 wi::max_value (TYPE_PRECISION (type), SIGNED))
3867 /* Let's ignore the @0 -1 and @2 min case. */
3868 : (expr_not_equal_to (@2,
3869 wi::min_value (TYPE_PRECISION (type), SIGNED))
3870 && expr_not_equal_to (@2,
3871 wi::min_value (TYPE_PRECISION (type), SIGNED)
3874 (mult (plusminus { build_one_cst (type); } @2) @0)))
3876 (plusminus (mult:c@3 @0 @2) @0)
3877 (if ((!ANY_INTEGRAL_TYPE_P (type)
3878 || TYPE_OVERFLOW_WRAPS (type)
3879 /* For @0*@2 + @0 this transformation would introduce UB
3880 (where there was none before) for @0 in [-1,0] and @2 max.
3881 For @0*@2 - @0 this transformation would introduce UB
3882 for @0 0 and @2 min. */
3883 || (INTEGRAL_TYPE_P (type)
3884 && ((tree_expr_nonzero_p (@0)
3885 && (plusminus == MINUS_EXPR
3886 || expr_not_equal_to (@0,
3887 wi::minus_one (TYPE_PRECISION (type)))))
3888 || expr_not_equal_to (@2,
3889 (plusminus == PLUS_EXPR
3890 ? wi::max_value (TYPE_PRECISION (type), SIGNED)
3891 : wi::min_value (TYPE_PRECISION (type), SIGNED))))))
3893 (mult (plusminus @2 { build_one_cst (type); }) @0))))))
3896 /* Canonicalize X + (X << C) into X * (1 + (1 << C)) and
3897 (X << C1) + (X << C2) into X * ((1 << C1) + (1 << C2)). */
3899 (plus:c @0 (lshift:s @0 INTEGER_CST@1))
3900 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
3901 && tree_fits_uhwi_p (@1)
3902 && tree_to_uhwi (@1) < element_precision (type)
3903 && (INTEGRAL_TYPE_P (TREE_TYPE (@0))
3904 || optab_handler (smul_optab,
3905 TYPE_MODE (type)) != CODE_FOR_nothing))
3906 (with { tree t = type;
3907 if (!TYPE_OVERFLOW_WRAPS (t)) t = unsigned_type_for (t);
3908 wide_int w = wi::set_bit_in_zero (tree_to_uhwi (@1),
3909 element_precision (type));
3911 tree cst = wide_int_to_tree (VECTOR_TYPE_P (t) ? TREE_TYPE (t)
3913 cst = build_uniform_cst (t, cst); }
3914 (convert (mult (convert:t @0) { cst; })))))
3916 (plus (lshift:s @0 INTEGER_CST@1) (lshift:s @0 INTEGER_CST@2))
3917 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
3918 && tree_fits_uhwi_p (@1)
3919 && tree_to_uhwi (@1) < element_precision (type)
3920 && tree_fits_uhwi_p (@2)
3921 && tree_to_uhwi (@2) < element_precision (type)
3922 && (INTEGRAL_TYPE_P (TREE_TYPE (@0))
3923 || optab_handler (smul_optab,
3924 TYPE_MODE (type)) != CODE_FOR_nothing))
3925 (with { tree t = type;
3926 if (!TYPE_OVERFLOW_WRAPS (t)) t = unsigned_type_for (t);
3927 unsigned int prec = element_precision (type);
3928 wide_int w = wi::set_bit_in_zero (tree_to_uhwi (@1), prec);
3929 w += wi::set_bit_in_zero (tree_to_uhwi (@2), prec);
3930 tree cst = wide_int_to_tree (VECTOR_TYPE_P (t) ? TREE_TYPE (t)
3932 cst = build_uniform_cst (t, cst); }
3933 (convert (mult (convert:t @0) { cst; })))))
3936 /* Canonicalize (X*C1)|(X*C2) and (X*C1)^(X*C2) to (C1+C2)*X when
3937 tree_nonzero_bits allows IOR and XOR to be treated like PLUS.
3938 Likewise, handle (X<<C3) and X as legitimate variants of X*C. */
3939 (for op (bit_ior bit_xor)
3941 (op (mult:s@0 @1 INTEGER_CST@2)
3942 (mult:s@3 @1 INTEGER_CST@4))
3943 (if (INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_WRAPS (type)
3944 && (tree_nonzero_bits (@0) & tree_nonzero_bits (@3)) == 0)
3946 { wide_int_to_tree (type, wi::to_wide (@2) + wi::to_wide (@4)); })))
3948 (op:c (mult:s@0 @1 INTEGER_CST@2)
3949 (lshift:s@3 @1 INTEGER_CST@4))
3950 (if (INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_WRAPS (type)
3951 && tree_int_cst_sgn (@4) > 0
3952 && (tree_nonzero_bits (@0) & tree_nonzero_bits (@3)) == 0)
3953 (with { wide_int wone = wi::one (TYPE_PRECISION (type));
3954 wide_int c = wi::add (wi::to_wide (@2),
3955 wi::lshift (wone, wi::to_wide (@4))); }
3956 (mult @1 { wide_int_to_tree (type, c); }))))
3958 (op:c (mult:s@0 @1 INTEGER_CST@2)
3960 (if (INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_WRAPS (type)
3961 && (tree_nonzero_bits (@0) & tree_nonzero_bits (@1)) == 0)
3963 { wide_int_to_tree (type,
3964 wi::add (wi::to_wide (@2), 1)); })))
3966 (op (lshift:s@0 @1 INTEGER_CST@2)
3967 (lshift:s@3 @1 INTEGER_CST@4))
3968 (if (INTEGRAL_TYPE_P (type)
3969 && tree_int_cst_sgn (@2) > 0
3970 && tree_int_cst_sgn (@4) > 0
3971 && (tree_nonzero_bits (@0) & tree_nonzero_bits (@3)) == 0)
3972 (with { tree t = type;
3973 if (!TYPE_OVERFLOW_WRAPS (t))
3974 t = unsigned_type_for (t);
3975 wide_int wone = wi::one (TYPE_PRECISION (t));
3976 wide_int c = wi::add (wi::lshift (wone, wi::to_wide (@2)),
3977 wi::lshift (wone, wi::to_wide (@4))); }
3978 (convert (mult:t (convert:t @1) { wide_int_to_tree (t,c); })))))
3980 (op:c (lshift:s@0 @1 INTEGER_CST@2)
3982 (if (INTEGRAL_TYPE_P (type)
3983 && tree_int_cst_sgn (@2) > 0
3984 && (tree_nonzero_bits (@0) & tree_nonzero_bits (@1)) == 0)
3985 (with { tree t = type;
3986 if (!TYPE_OVERFLOW_WRAPS (t))
3987 t = unsigned_type_for (t);
3988 wide_int wone = wi::one (TYPE_PRECISION (t));
3989 wide_int c = wi::add (wi::lshift (wone, wi::to_wide (@2)), wone); }
3990 (convert (mult:t (convert:t @1) { wide_int_to_tree (t, c); }))))))
3992 /* Simplifications of MIN_EXPR, MAX_EXPR, fmin() and fmax(). */
3994 (for minmax (min max)
3998 /* max(max(x,y),x) -> max(x,y) */
4000 (minmax:c (minmax:c@2 @0 @1) @0)
4002 /* For fmin() and fmax(), skip folding when both are sNaN. */
4003 (for minmax (FMIN_ALL FMAX_ALL)
4006 (if (!tree_expr_maybe_signaling_nan_p (@0))
4008 /* min(max(x,y),y) -> y. */
4010 (min:c (max:c @0 @1) @1)
4012 /* max(min(x,y),y) -> y. */
4014 (max:c (min:c @0 @1) @1)
4016 /* max(a,-a) -> abs(a). */
4018 (max:c @0 (negate @0))
4019 (if (TREE_CODE (type) != COMPLEX_TYPE
4020 && (! ANY_INTEGRAL_TYPE_P (type)
4021 || TYPE_OVERFLOW_UNDEFINED (type)))
4023 /* min(a,-a) -> -abs(a). */
4025 (min:c @0 (negate @0))
4026 (if (TREE_CODE (type) != COMPLEX_TYPE
4027 && (! ANY_INTEGRAL_TYPE_P (type)
4028 || TYPE_OVERFLOW_UNDEFINED (type)))
4033 (if (INTEGRAL_TYPE_P (type)
4034 && TYPE_MIN_VALUE (type)
4035 && operand_equal_p (@1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST))
4037 (if (INTEGRAL_TYPE_P (type)
4038 && TYPE_MAX_VALUE (type)
4039 && operand_equal_p (@1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST))
4044 (if (INTEGRAL_TYPE_P (type)
4045 && TYPE_MAX_VALUE (type)
4046 && operand_equal_p (@1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST))
4048 (if (INTEGRAL_TYPE_P (type)
4049 && TYPE_MIN_VALUE (type)
4050 && operand_equal_p (@1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST))
4053 /* max (a, a + CST) -> a + CST where CST is positive. */
4054 /* max (a, a + CST) -> a where CST is negative. */
4056 (max:c @0 (plus@2 @0 INTEGER_CST@1))
4057 (if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
4058 (if (tree_int_cst_sgn (@1) > 0)
4062 /* min (a, a + CST) -> a where CST is positive. */
4063 /* min (a, a + CST) -> a + CST where CST is negative. */
4065 (min:c @0 (plus@2 @0 INTEGER_CST@1))
4066 (if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
4067 (if (tree_int_cst_sgn (@1) > 0)
4071 /* Simplify min (&var[off0], &var[off1]) etc. depending on whether
4072 the addresses are known to be less, equal or greater. */
4073 (for minmax (min max)
4076 (minmax (convert1?@2 addr@0) (convert2?@3 addr@1))
4079 poly_int64 off0, off1;
4081 int equal = address_compare (cmp, TREE_TYPE (@2), @0, @1, base0, base1,
4082 off0, off1, GENERIC);
4085 (if (minmax == MIN_EXPR)
4086 (if (known_le (off0, off1))
4088 (if (known_gt (off0, off1))
4090 (if (known_ge (off0, off1))
4092 (if (known_lt (off0, off1))
4095 /* (convert (minmax ((convert (x) c)))) -> minmax (x c) if x is promoted
4096 and the outer convert demotes the expression back to x's type. */
4097 (for minmax (min max)
4099 (convert (minmax@0 (convert @1) INTEGER_CST@2))
4100 (if (INTEGRAL_TYPE_P (type)
4101 && types_match (@1, type) && int_fits_type_p (@2, type)
4102 && TYPE_SIGN (TREE_TYPE (@0)) == TYPE_SIGN (type)
4103 && TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (type))
4104 (minmax @1 (convert @2)))))
4106 (for minmax (FMIN_ALL FMAX_ALL)
4107 /* If either argument is NaN and other one is not sNaN, return the other
4108 one. Avoid the transformation if we get (and honor) a signalling NaN. */
4110 (minmax:c @0 REAL_CST@1)
4111 (if (real_isnan (TREE_REAL_CST_PTR (@1))
4112 && (!HONOR_SNANS (@1) || !TREE_REAL_CST (@1).signalling)
4113 && !tree_expr_maybe_signaling_nan_p (@0))
4115 /* Convert fmin/fmax to MIN_EXPR/MAX_EXPR. C99 requires these
4116 functions to return the numeric arg if the other one is NaN.
4117 MIN and MAX don't honor that, so only transform if -ffinite-math-only
4118 is set. C99 doesn't require -0.0 to be handled, so we don't have to
4119 worry about it either. */
4120 (if (flag_finite_math_only)
4127 /* min (-A, -B) -> -max (A, B) */
4128 (for minmax (min max FMIN_ALL FMAX_ALL)
4129 maxmin (max min FMAX_ALL FMIN_ALL)
4131 (minmax (negate:s@2 @0) (negate:s@3 @1))
4132 (if (FLOAT_TYPE_P (TREE_TYPE (@0))
4133 || (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
4134 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))))
4135 (negate (maxmin @0 @1)))))
4136 /* MIN (~X, ~Y) -> ~MAX (X, Y)
4137 MAX (~X, ~Y) -> ~MIN (X, Y) */
4138 (for minmax (min max)
4141 (minmax (bit_not:s@2 @0) (bit_not:s@3 @1))
4142 (bit_not (maxmin @0 @1)))
4143 /* ~MAX(~X, Y) --> MIN(X, ~Y) */
4144 /* ~MIN(~X, Y) --> MAX(X, ~Y) */
4146 (bit_not (minmax:cs (bit_not @0) @1))
4147 (maxmin @0 (bit_not @1))))
4149 /* MIN (X, Y) == X -> X <= Y */
4150 /* MIN (X, Y) < X -> X > Y */
4151 /* MIN (X, Y) >= X -> X <= Y */
4152 (for minmax (min min min min max max max max)
4153 cmp (eq ne lt ge eq ne gt le )
4154 out (le gt gt le ge lt lt ge )
4156 (cmp:c (minmax:c @0 @1) @0)
4157 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0)))
4159 /* MIN (X, 5) == 0 -> X == 0
4160 MIN (X, 5) == 7 -> false */
4163 (cmp (min @0 INTEGER_CST@1) INTEGER_CST@2)
4164 (if (wi::lt_p (wi::to_wide (@1), wi::to_wide (@2),
4165 TYPE_SIGN (TREE_TYPE (@0))))
4166 { constant_boolean_node (cmp == NE_EXPR, type); }
4167 (if (wi::gt_p (wi::to_wide (@1), wi::to_wide (@2),
4168 TYPE_SIGN (TREE_TYPE (@0))))
4172 (cmp (max @0 INTEGER_CST@1) INTEGER_CST@2)
4173 (if (wi::gt_p (wi::to_wide (@1), wi::to_wide (@2),
4174 TYPE_SIGN (TREE_TYPE (@0))))
4175 { constant_boolean_node (cmp == NE_EXPR, type); }
4176 (if (wi::lt_p (wi::to_wide (@1), wi::to_wide (@2),
4177 TYPE_SIGN (TREE_TYPE (@0))))
4180 /* X <= MAX(X, Y) -> true
4181 X > MAX(X, Y) -> false
4182 X >= MIN(X, Y) -> true
4183 X < MIN(X, Y) -> false */
4184 (for minmax (min min max max )
4187 (cmp:c @0 (minmax:c @0 @1))
4188 { constant_boolean_node (cmp == GE_EXPR || cmp == LE_EXPR, type); } ))
4190 /* MIN (X, C1) < C2 -> X < C2 || C1 < C2 */
4191 (for minmax (min min max max min min max max )
4192 cmp (lt le gt ge gt ge lt le )
4193 comb (bit_ior bit_ior bit_ior bit_ior bit_and bit_and bit_and bit_and)
4195 (cmp (minmax @0 INTEGER_CST@1) INTEGER_CST@2)
4196 (comb (cmp @0 @2) (cmp @1 @2))))
4198 /* Undo fancy ways of writing max/min or other ?: expressions, like
4199 a - ((a - b) & -(a < b)) and a - (a - b) * (a < b) into (a < b) ? b : a.
4200 People normally use ?: and that is what we actually try to optimize. */
4201 /* Transform A + (B-A)*cmp into cmp ? B : A. */
4203 (plus:c @0 (mult:c (minus @1 @0) zero_one_valued_p@2))
4204 (if (INTEGRAL_TYPE_P (type)
4205 && (GIMPLE || !TREE_SIDE_EFFECTS (@1)))
4206 (cond (convert:boolean_type_node @2) @1 @0)))
4207 /* Transform A - (A-B)*cmp into cmp ? B : A. */
4209 (minus @0 (mult:c (minus @0 @1) zero_one_valued_p@2))
4210 (if (INTEGRAL_TYPE_P (type)
4211 && (GIMPLE || !TREE_SIDE_EFFECTS (@1)))
4212 (cond (convert:boolean_type_node @2) @1 @0)))
4213 /* Transform A ^ (A^B)*cmp into cmp ? B : A. */
4215 (bit_xor:c @0 (mult:c (bit_xor:c @0 @1) zero_one_valued_p@2))
4216 (if (INTEGRAL_TYPE_P (type)
4217 && (GIMPLE || !TREE_SIDE_EFFECTS (@1)))
4218 (cond (convert:boolean_type_node @2) @1 @0)))
4220 /* (x <= 0 ? -x : 0) -> max(-x, 0). */
4222 (cond (le @0 integer_zerop@1) (negate@2 @0) integer_zerop@1)
4223 (if (ANY_INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_UNDEFINED (type))
4226 /* (zero_one == 0) ? y : z <op> y -> ((typeof(y))zero_one * z) <op> y */
4227 (for op (bit_xor bit_ior plus)
4229 (cond (eq zero_one_valued_p@0
4233 (if (INTEGRAL_TYPE_P (type)
4234 && TYPE_PRECISION (type) > 1
4235 && (INTEGRAL_TYPE_P (TREE_TYPE (@0))))
4236 (op (mult (convert:type @0) @2) @1))))
4238 /* (zero_one != 0) ? z <op> y : y -> ((typeof(y))zero_one * z) <op> y */
4239 (for op (bit_xor bit_ior plus)
4241 (cond (ne zero_one_valued_p@0
4245 (if (INTEGRAL_TYPE_P (type)
4246 && TYPE_PRECISION (type) > 1
4247 && (INTEGRAL_TYPE_P (TREE_TYPE (@0))))
4248 (op (mult (convert:type @0) @2) @1))))
4250 /* ?: Value replacement. */
4251 /* a == 0 ? b : b + a -> b + a */
4252 (for op (plus bit_ior bit_xor)
4254 (cond (eq @0 integer_zerop) @1 (op:c@2 @1 @0))
4256 /* a == 0 ? b : b - a -> b - a */
4257 /* a == 0 ? b : b ptr+ a -> b ptr+ a */
4258 /* a == 0 ? b : b shift/rotate a -> b shift/rotate a */
4259 (for op (lrotate rrotate lshift rshift minus pointer_plus)
4261 (cond (eq @0 integer_zerop) @1 (op@2 @1 @0))
4264 /* a == 1 ? b : b / a -> b / a */
4265 (for op (trunc_div ceil_div floor_div round_div exact_div)
4267 (cond (eq @0 integer_onep) @1 (op@2 @1 @0))
4270 /* a == 1 ? b : a * b -> a * b */
4273 (cond (eq @0 integer_onep) @1 (op:c@2 @1 @0))
4276 /* a == -1 ? b : a & b -> a & b */
4279 (cond (eq @0 integer_all_onesp) @1 (op:c@2 @1 @0))
4282 /* Simplifications of shift and rotates. */
4284 (for rotate (lrotate rrotate)
4286 (rotate integer_all_onesp@0 @1)
4289 /* Optimize -1 >> x for arithmetic right shifts. */
4291 (rshift integer_all_onesp@0 @1)
4292 (if (!TYPE_UNSIGNED (type))
4295 /* Optimize (x >> c) << c into x & (-1<<c). */
4297 (lshift (nop_convert? (rshift @0 INTEGER_CST@1)) @1)
4298 (if (wi::ltu_p (wi::to_wide (@1), element_precision (type)))
4299 /* It doesn't matter if the right shift is arithmetic or logical. */
4300 (bit_and (view_convert @0) (lshift { build_minus_one_cst (type); } @1))))
4303 (lshift (convert (convert@2 (rshift @0 INTEGER_CST@1))) @1)
4304 (if (wi::ltu_p (wi::to_wide (@1), element_precision (type))
4305 /* Allow intermediate conversion to integral type with whatever sign, as
4306 long as the low TYPE_PRECISION (type)
4307 - TYPE_PRECISION (TREE_TYPE (@2)) bits are preserved. */
4308 && INTEGRAL_TYPE_P (type)
4309 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
4310 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
4311 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (@0))
4312 && (TYPE_PRECISION (TREE_TYPE (@2)) >= TYPE_PRECISION (type)
4313 || wi::geu_p (wi::to_wide (@1),
4314 TYPE_PRECISION (type)
4315 - TYPE_PRECISION (TREE_TYPE (@2)))))
4316 (bit_and (convert @0) (lshift { build_minus_one_cst (type); } @1))))
4318 /* For (x << c) >> c, optimize into x & ((unsigned)-1 >> c) for
4319 unsigned x OR truncate into the precision(type) - c lowest bits
4320 of signed x (if they have mode precision or a precision of 1). */
4322 (rshift (nop_convert? (lshift @0 INTEGER_CST@1)) @@1)
4323 (if (wi::ltu_p (wi::to_wide (@1), element_precision (type)))
4324 (if (TYPE_UNSIGNED (type))
4325 (bit_and (convert @0) (rshift { build_minus_one_cst (type); } @1))
4326 (if (INTEGRAL_TYPE_P (type))
4328 int width = element_precision (type) - tree_to_uhwi (@1);
4329 tree stype = NULL_TREE;
4330 if (width <= MAX_FIXED_MODE_SIZE)
4331 stype = build_nonstandard_integer_type (width, 0);
4333 (if (stype && (width == 1 || type_has_mode_precision_p (stype)))
4334 (convert (convert:stype @0))))))))
4336 /* Optimize x >> x into 0 */
4339 { build_zero_cst (type); })
4341 (for shiftrotate (lrotate rrotate lshift rshift)
4343 (shiftrotate @0 integer_zerop)
4346 (shiftrotate integer_zerop@0 @1)
4348 /* Prefer vector1 << scalar to vector1 << vector2
4349 if vector2 is uniform. */
4350 (for vec (VECTOR_CST CONSTRUCTOR)
4352 (shiftrotate @0 vec@1)
4353 (with { tree tem = uniform_vector_p (@1); }
4355 (shiftrotate @0 { tem; }))))))
4357 /* Simplify X << Y where Y's low width bits are 0 to X, as only valid
4358 Y is 0. Similarly for X >> Y. */
4360 (for shift (lshift rshift)
4362 (shift @0 SSA_NAME@1)
4363 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1)))
4365 int width = ceil_log2 (element_precision (TREE_TYPE (@0)));
4366 int prec = TYPE_PRECISION (TREE_TYPE (@1));
4368 (if ((get_nonzero_bits (@1) & wi::mask (width, false, prec)) == 0)
4372 /* Rewrite an LROTATE_EXPR by a constant into an
4373 RROTATE_EXPR by a new constant. */
4375 (lrotate @0 INTEGER_CST@1)
4376 (rrotate @0 { const_binop (MINUS_EXPR, TREE_TYPE (@1),
4377 build_int_cst (TREE_TYPE (@1),
4378 element_precision (type)), @1); }))
4380 /* Turn (a OP c1) OP c2 into a OP (c1+c2). */
4381 (for op (lrotate rrotate rshift lshift)
4383 (op (op @0 INTEGER_CST@1) INTEGER_CST@2)
4384 (with { unsigned int prec = element_precision (type); }
4385 (if (wi::ge_p (wi::to_wide (@1), 0, TYPE_SIGN (TREE_TYPE (@1)))
4386 && wi::lt_p (wi::to_wide (@1), prec, TYPE_SIGN (TREE_TYPE (@1)))
4387 && wi::ge_p (wi::to_wide (@2), 0, TYPE_SIGN (TREE_TYPE (@2)))
4388 && wi::lt_p (wi::to_wide (@2), prec, TYPE_SIGN (TREE_TYPE (@2))))
4389 (with { unsigned int low = (tree_to_uhwi (@1)
4390 + tree_to_uhwi (@2)); }
4391 /* Deal with a OP (c1 + c2) being undefined but (a OP c1) OP c2
4392 being well defined. */
4394 (if (op == LROTATE_EXPR || op == RROTATE_EXPR)
4395 (op @0 { build_int_cst (TREE_TYPE (@1), low % prec); })
4396 (if (TYPE_UNSIGNED (type) || op == LSHIFT_EXPR)
4397 { build_zero_cst (type); }
4398 (op @0 { build_int_cst (TREE_TYPE (@1), prec - 1); })))
4399 (op @0 { build_int_cst (TREE_TYPE (@1), low); })))))))
4402 /* Simplify (CST << x) & 1 to 0 if CST is even or to x == 0 if it is odd. */
4404 (bit_and (lshift INTEGER_CST@1 @0) integer_onep)
4405 (if ((wi::to_wide (@1) & 1) != 0)
4406 (convert (eq:boolean_type_node @0 { build_zero_cst (TREE_TYPE (@0)); }))
4407 { build_zero_cst (type); }))
4409 /* Simplify ((C << x) & D) != 0 where C and D are power of two constants,
4410 either to false if D is smaller (unsigned comparison) than C, or to
4411 x == log2 (D) - log2 (C). Similarly for right shifts.
4412 Note for `(1 >> x)`, the & 1 has been removed so matching that seperately. */
4416 (cmp (bit_and (lshift integer_pow2p@1 @0) integer_pow2p@2) integer_zerop)
4417 (with { int c1 = wi::clz (wi::to_wide (@1));
4418 int c2 = wi::clz (wi::to_wide (@2)); }
4420 { constant_boolean_node (cmp == NE_EXPR ? false : true, type); }
4421 (icmp @0 { build_int_cst (TREE_TYPE (@0), c1 - c2); }))))
4423 (cmp (bit_and (rshift integer_pow2p@1 @0) integer_pow2p@2) integer_zerop)
4424 (if (tree_int_cst_sgn (@1) > 0)
4425 (with { int c1 = wi::clz (wi::to_wide (@1));
4426 int c2 = wi::clz (wi::to_wide (@2)); }
4428 { constant_boolean_node (cmp == NE_EXPR ? false : true, type); }
4429 (icmp @0 { build_int_cst (TREE_TYPE (@0), c2 - c1); })))))
4430 /* `(1 >> X) != 0` -> `X == 0` */
4431 /* `(1 >> X) == 0` -> `X != 0` */
4433 (cmp (rshift integer_onep@1 @0) integer_zerop)
4434 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1)))
4435 (icmp @0 { build_zero_cst (TREE_TYPE (@0)); }))))
4437 /* (CST1 << A) == CST2 -> A == ctz (CST2) - ctz (CST1)
4438 (CST1 << A) != CST2 -> A != ctz (CST2) - ctz (CST1)
4442 (cmp (lshift INTEGER_CST@0 @1) INTEGER_CST@2)
4443 (with { int cand = wi::ctz (wi::to_wide (@2)) - wi::ctz (wi::to_wide (@0)); }
4445 || (!integer_zerop (@2)
4446 && wi::lshift (wi::to_wide (@0), cand) != wi::to_wide (@2)))
4447 { constant_boolean_node (cmp == NE_EXPR, type); }
4448 (if (!integer_zerop (@2)
4449 && wi::lshift (wi::to_wide (@0), cand) == wi::to_wide (@2))
4450 (cmp @1 { build_int_cst (TREE_TYPE (@1), cand); }))))))
4452 /* Fold ((X << C1) & C2) cmp C3 into (X & (C2 >> C1)) cmp (C3 >> C1)
4453 ((X >> C1) & C2) cmp C3 into (X & (C2 << C1)) cmp (C3 << C1). */
4456 (cmp (bit_and:s (lshift:s @0 INTEGER_CST@1) INTEGER_CST@2) INTEGER_CST@3)
4457 (if (tree_fits_shwi_p (@1)
4458 && tree_to_shwi (@1) > 0
4459 && tree_to_shwi (@1) < TYPE_PRECISION (TREE_TYPE (@0)))
4460 (if (tree_to_shwi (@1) > wi::ctz (wi::to_wide (@3)))
4461 { constant_boolean_node (cmp == NE_EXPR, type); }
4462 (with { wide_int c1 = wi::to_wide (@1);
4463 wide_int c2 = wi::lrshift (wi::to_wide (@2), c1);
4464 wide_int c3 = wi::lrshift (wi::to_wide (@3), c1); }
4465 (cmp (bit_and @0 { wide_int_to_tree (TREE_TYPE (@0), c2); })
4466 { wide_int_to_tree (TREE_TYPE (@0), c3); })))))
4468 (cmp (bit_and:s (rshift:s @0 INTEGER_CST@1) INTEGER_CST@2) INTEGER_CST@3)
4469 (if (tree_fits_shwi_p (@1)
4470 && tree_to_shwi (@1) > 0
4471 && tree_to_shwi (@1) < TYPE_PRECISION (TREE_TYPE (@0)))
4472 (with { tree t0 = TREE_TYPE (@0);
4473 unsigned int prec = TYPE_PRECISION (t0);
4474 wide_int c1 = wi::to_wide (@1);
4475 wide_int c2 = wi::to_wide (@2);
4476 wide_int c3 = wi::to_wide (@3);
4477 wide_int sb = wi::set_bit_in_zero (prec - 1, prec); }
4478 (if ((c2 & c3) != c3)
4479 { constant_boolean_node (cmp == NE_EXPR, type); }
4480 (if (TYPE_UNSIGNED (t0))
4481 (if ((c3 & wi::arshift (sb, c1 - 1)) != 0)
4482 { constant_boolean_node (cmp == NE_EXPR, type); }
4483 (cmp (bit_and @0 { wide_int_to_tree (t0, c2 << c1); })
4484 { wide_int_to_tree (t0, c3 << c1); }))
4485 (with { wide_int smask = wi::arshift (sb, c1); }
4487 (if ((c2 & smask) == 0)
4488 (cmp (bit_and @0 { wide_int_to_tree (t0, c2 << c1); })
4489 { wide_int_to_tree (t0, c3 << c1); }))
4490 (if ((c3 & smask) == 0)
4491 (cmp (bit_and @0 { wide_int_to_tree (t0, (c2 << c1) | sb); })
4492 { wide_int_to_tree (t0, c3 << c1); }))
4493 (if ((c2 & smask) != (c3 & smask))
4494 { constant_boolean_node (cmp == NE_EXPR, type); })
4495 (cmp (bit_and @0 { wide_int_to_tree (t0, (c2 << c1) | sb); })
4496 { wide_int_to_tree (t0, (c3 << c1) | sb); })))))))))
4498 /* Fold (X << C1) & C2 into (X << C1) & (C2 | ((1 << C1) - 1))
4499 (X >> C1) & C2 into (X >> C1) & (C2 | ~((type) -1 >> C1))
4500 if the new mask might be further optimized. */
4501 (for shift (lshift rshift)
4503 (bit_and (convert?:s@4 (shift:s@5 (convert1?@3 @0) INTEGER_CST@1))
4505 (if (tree_nop_conversion_p (TREE_TYPE (@4), TREE_TYPE (@5))
4506 && TYPE_PRECISION (type) <= HOST_BITS_PER_WIDE_INT
4507 && tree_fits_uhwi_p (@1)
4508 && tree_to_uhwi (@1) > 0
4509 && tree_to_uhwi (@1) < TYPE_PRECISION (type))
4512 unsigned int shiftc = tree_to_uhwi (@1);
4513 unsigned HOST_WIDE_INT mask = TREE_INT_CST_LOW (@2);
4514 unsigned HOST_WIDE_INT newmask, zerobits = 0;
4515 tree shift_type = TREE_TYPE (@3);
4518 if (shift == LSHIFT_EXPR)
4519 zerobits = ((HOST_WIDE_INT_1U << shiftc) - 1);
4520 else if (shift == RSHIFT_EXPR
4521 && type_has_mode_precision_p (shift_type))
4523 prec = TYPE_PRECISION (TREE_TYPE (@3));
4525 /* See if more bits can be proven as zero because of
4528 && TYPE_UNSIGNED (TREE_TYPE (@0)))
4530 tree inner_type = TREE_TYPE (@0);
4531 if (type_has_mode_precision_p (inner_type)
4532 && TYPE_PRECISION (inner_type) < prec)
4534 prec = TYPE_PRECISION (inner_type);
4535 /* See if we can shorten the right shift. */
4537 shift_type = inner_type;
4538 /* Otherwise X >> C1 is all zeros, so we'll optimize
4539 it into (X, 0) later on by making sure zerobits
4543 zerobits = HOST_WIDE_INT_M1U;
4546 zerobits >>= HOST_BITS_PER_WIDE_INT - shiftc;
4547 zerobits <<= prec - shiftc;
4549 /* For arithmetic shift if sign bit could be set, zerobits
4550 can contain actually sign bits, so no transformation is
4551 possible, unless MASK masks them all away. In that
4552 case the shift needs to be converted into logical shift. */
4553 if (!TYPE_UNSIGNED (TREE_TYPE (@3))
4554 && prec == TYPE_PRECISION (TREE_TYPE (@3)))
4556 if ((mask & zerobits) == 0)
4557 shift_type = unsigned_type_for (TREE_TYPE (@3));
4563 /* ((X << 16) & 0xff00) is (X, 0). */
4564 (if ((mask & zerobits) == mask)
4565 { build_int_cst (type, 0); }
4566 (with { newmask = mask | zerobits; }
4567 (if (newmask != mask && (newmask & (newmask + 1)) == 0)
4570 /* Only do the transformation if NEWMASK is some integer
4572 for (prec = BITS_PER_UNIT;
4573 prec < HOST_BITS_PER_WIDE_INT; prec <<= 1)
4574 if (newmask == (HOST_WIDE_INT_1U << prec) - 1)
4577 (if (prec < HOST_BITS_PER_WIDE_INT
4578 || newmask == HOST_WIDE_INT_M1U)
4580 { tree newmaskt = build_int_cst_type (TREE_TYPE (@2), newmask); }
4581 (if (!tree_int_cst_equal (newmaskt, @2))
4582 (if (shift_type != TREE_TYPE (@3))
4583 (bit_and (convert (shift:shift_type (convert @3) @1)) { newmaskt; })
4584 (bit_and @4 { newmaskt; })))))))))))))
4586 /* ((1 << n) & M) != 0 -> n == log2 (M) */
4592 (nop_convert? (lshift integer_onep @0)) integer_pow2p@1) integer_zerop)
4593 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)))
4594 (icmp @0 { wide_int_to_tree (TREE_TYPE (@0),
4595 wi::exact_log2 (wi::to_wide (@1))); }))))
4597 /* Fold (X {&,^,|} C2) << C1 into (X << C1) {&,^,|} (C2 << C1)
4598 (X {&,^,|} C2) >> C1 into (X >> C1) & (C2 >> C1). */
4599 (for shift (lshift rshift)
4600 (for bit_op (bit_and bit_xor bit_ior)
4602 (shift (convert?:s (bit_op:s @0 INTEGER_CST@2)) INTEGER_CST@1)
4603 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
4604 (with { tree mask = int_const_binop (shift, fold_convert (type, @2), @1); }
4606 (bit_op (shift (convert @0) @1) { mask; })))))))
4608 /* ~(~X >> Y) -> X >> Y (for arithmetic shift). */
4610 (bit_not (convert1?:s (rshift:s (convert2?@0 (bit_not @1)) @2)))
4611 (if (!TYPE_UNSIGNED (TREE_TYPE (@0))
4612 && (element_precision (TREE_TYPE (@0))
4613 <= element_precision (TREE_TYPE (@1))
4614 || !TYPE_UNSIGNED (TREE_TYPE (@1))))
4616 { tree shift_type = TREE_TYPE (@0); }
4617 (convert (rshift (convert:shift_type @1) @2)))))
4619 /* ~(~X >>r Y) -> X >>r Y
4620 ~(~X <<r Y) -> X <<r Y */
4621 (for rotate (lrotate rrotate)
4623 (bit_not (convert1?:s (rotate:s (convert2?@0 (bit_not @1)) @2)))
4624 (if ((element_precision (TREE_TYPE (@0))
4625 <= element_precision (TREE_TYPE (@1))
4626 || !TYPE_UNSIGNED (TREE_TYPE (@1)))
4627 && (element_precision (type) <= element_precision (TREE_TYPE (@0))
4628 || !TYPE_UNSIGNED (TREE_TYPE (@0))))
4630 { tree rotate_type = TREE_TYPE (@0); }
4631 (convert (rotate (convert:rotate_type @1) @2))))))
4634 (for rotate (lrotate rrotate)
4635 invrot (rrotate lrotate)
4636 /* (X >>r Y) cmp (Z >>r Y) may simplify to X cmp Y. */
4638 (cmp (rotate @1 @0) (rotate @2 @0))
4640 /* (X >>r C1) cmp C2 may simplify to X cmp C3. */
4642 (cmp (rotate @0 INTEGER_CST@1) INTEGER_CST@2)
4643 (cmp @0 { const_binop (invrot, TREE_TYPE (@0), @2, @1); }))
4644 /* (X >>r Y) cmp C where C is 0 or ~0, may simplify to X cmp C. */
4646 (cmp (rotate @0 @1) INTEGER_CST@2)
4647 (if (integer_zerop (@2) || integer_all_onesp (@2))
4650 /* Narrow a lshift by constant. */
4652 (convert (lshift:s@0 @1 INTEGER_CST@2))
4653 (if (INTEGRAL_TYPE_P (type)
4654 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
4655 && !integer_zerop (@2)
4656 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0)))
4657 (if (TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (@0))
4658 || wi::ltu_p (wi::to_wide (@2), TYPE_PRECISION (type)))
4659 (lshift (convert @1) @2)
4660 (if (wi::ltu_p (wi::to_wide (@2), TYPE_PRECISION (TREE_TYPE (@0))))
4661 { build_zero_cst (type); }))))
4663 /* Simplifications of conversions. */
4665 /* Basic strip-useless-type-conversions / strip_nops. */
4666 (for cvt (convert view_convert float fix_trunc)
4669 (if ((GIMPLE && useless_type_conversion_p (type, TREE_TYPE (@0)))
4670 || (GENERIC && type == TREE_TYPE (@0)))
4673 /* Contract view-conversions. */
4675 (view_convert (view_convert @0))
4678 /* For integral conversions with the same precision or pointer
4679 conversions use a NOP_EXPR instead. */
4682 (if ((INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type))
4683 && (INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))
4684 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (@0)))
4687 /* Strip inner integral conversions that do not change precision or size, or
4688 zero-extend while keeping the same size (for bool-to-char). */
4690 (view_convert (convert@0 @1))
4691 (if ((INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))
4692 && (INTEGRAL_TYPE_P (TREE_TYPE (@1)) || POINTER_TYPE_P (TREE_TYPE (@1)))
4693 && TYPE_SIZE (TREE_TYPE (@0)) == TYPE_SIZE (TREE_TYPE (@1))
4694 && (TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1))
4695 || (TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (TREE_TYPE (@1))
4696 && TYPE_UNSIGNED (TREE_TYPE (@1)))))
4699 /* Simplify a view-converted empty or single-element constructor. */
4701 (view_convert CONSTRUCTOR@0)
4703 { tree ctor = (TREE_CODE (@0) == SSA_NAME
4704 ? gimple_assign_rhs1 (SSA_NAME_DEF_STMT (@0)) : @0); }
4706 (if (CONSTRUCTOR_NELTS (ctor) == 0)
4707 { build_zero_cst (type); })
4708 (if (CONSTRUCTOR_NELTS (ctor) == 1
4709 && VECTOR_TYPE_P (TREE_TYPE (ctor))
4710 && operand_equal_p (TYPE_SIZE (type),
4711 TYPE_SIZE (TREE_TYPE
4712 (CONSTRUCTOR_ELT (ctor, 0)->value))))
4713 (view_convert { CONSTRUCTOR_ELT (ctor, 0)->value; })))))
4715 /* Re-association barriers around constants and other re-association
4716 barriers can be removed. */
4718 (paren CONSTANT_CLASS_P@0)
4721 (paren (paren@1 @0))
4724 /* Handle cases of two conversions in a row. */
4725 (for ocvt (convert float fix_trunc)
4726 (for icvt (convert float)
4731 tree inside_type = TREE_TYPE (@0);
4732 tree inter_type = TREE_TYPE (@1);
4733 int inside_int = INTEGRAL_TYPE_P (inside_type);
4734 int inside_ptr = POINTER_TYPE_P (inside_type);
4735 int inside_float = FLOAT_TYPE_P (inside_type);
4736 int inside_vec = VECTOR_TYPE_P (inside_type);
4737 unsigned int inside_prec = element_precision (inside_type);
4738 int inside_unsignedp = TYPE_UNSIGNED (inside_type);
4739 int inter_int = INTEGRAL_TYPE_P (inter_type);
4740 int inter_ptr = POINTER_TYPE_P (inter_type);
4741 int inter_float = FLOAT_TYPE_P (inter_type);
4742 int inter_vec = VECTOR_TYPE_P (inter_type);
4743 unsigned int inter_prec = element_precision (inter_type);
4744 int inter_unsignedp = TYPE_UNSIGNED (inter_type);
4745 int final_int = INTEGRAL_TYPE_P (type);
4746 int final_ptr = POINTER_TYPE_P (type);
4747 int final_float = FLOAT_TYPE_P (type);
4748 int final_vec = VECTOR_TYPE_P (type);
4749 unsigned int final_prec = element_precision (type);
4750 int final_unsignedp = TYPE_UNSIGNED (type);
4753 /* In addition to the cases of two conversions in a row
4754 handled below, if we are converting something to its own
4755 type via an object of identical or wider precision, neither
4756 conversion is needed. */
4757 (if (((GIMPLE && useless_type_conversion_p (type, inside_type))
4759 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (inside_type)))
4760 && (((inter_int || inter_ptr) && final_int)
4761 || (inter_float && final_float))
4762 && inter_prec >= final_prec)
4765 /* Likewise, if the intermediate and initial types are either both
4766 float or both integer, we don't need the middle conversion if the
4767 former is wider than the latter and doesn't change the signedness
4768 (for integers). Avoid this if the final type is a pointer since
4769 then we sometimes need the middle conversion. */
4770 (if (((inter_int && inside_int) || (inter_float && inside_float))
4771 && (final_int || final_float)
4772 && inter_prec >= inside_prec
4773 && (inter_float || inter_unsignedp == inside_unsignedp))
4776 /* If we have a sign-extension of a zero-extended value, we can
4777 replace that by a single zero-extension. Likewise if the
4778 final conversion does not change precision we can drop the
4779 intermediate conversion. Similarly truncation of a sign-extension
4780 can be replaced by a single sign-extension. */
4781 (if (inside_int && inter_int && final_int
4782 && ((inside_prec < inter_prec && inter_prec < final_prec
4783 && inside_unsignedp && !inter_unsignedp)
4784 || final_prec == inter_prec
4785 || (inside_prec < inter_prec && inter_prec > final_prec
4786 && !inside_unsignedp && inter_unsignedp)))
4789 /* Two conversions in a row are not needed unless:
4790 - some conversion is floating-point (overstrict for now), or
4791 - some conversion is a vector (overstrict for now), or
4792 - the intermediate type is narrower than both initial and
4794 - the intermediate type and innermost type differ in signedness,
4795 and the outermost type is wider than the intermediate, or
4796 - the initial type is a pointer type and the precisions of the
4797 intermediate and final types differ, or
4798 - the final type is a pointer type and the precisions of the
4799 initial and intermediate types differ. */
4800 (if (! inside_float && ! inter_float && ! final_float
4801 && ! inside_vec && ! inter_vec && ! final_vec
4802 && (inter_prec >= inside_prec || inter_prec >= final_prec)
4803 && ! (inside_int && inter_int
4804 && inter_unsignedp != inside_unsignedp
4805 && inter_prec < final_prec)
4806 && ((inter_unsignedp && inter_prec > inside_prec)
4807 == (final_unsignedp && final_prec > inter_prec))
4808 && ! (inside_ptr && inter_prec != final_prec)
4809 && ! (final_ptr && inside_prec != inter_prec))
4812 /* `(outer:M)(inter:N) a:O`
4813 can be converted to `(outer:M) a`
4814 if M <= O && N >= O. No matter what signedness of the casts,
4815 as the final is either a truncation from the original or just
4816 a sign change of the type. */
4817 (if (inside_int && inter_int && final_int
4818 && final_prec <= inside_prec
4819 && inter_prec >= inside_prec)
4822 /* A truncation to an unsigned type (a zero-extension) should be
4823 canonicalized as bitwise and of a mask. */
4824 (if (GIMPLE /* PR70366: doing this in GENERIC breaks -Wconversion. */
4825 && final_int && inter_int && inside_int
4826 && final_prec == inside_prec
4827 && final_prec > inter_prec
4829 (convert (bit_and @0 { wide_int_to_tree
4831 wi::mask (inter_prec, false,
4832 TYPE_PRECISION (inside_type))); })))
4834 /* If we are converting an integer to a floating-point that can
4835 represent it exactly and back to an integer, we can skip the
4836 floating-point conversion. */
4837 (if (GIMPLE /* PR66211 */
4838 && inside_int && inter_float && final_int &&
4839 (unsigned) significand_size (TYPE_MODE (inter_type))
4840 >= inside_prec - !inside_unsignedp)
4843 /* (float_type)(integer_type) x -> trunc (x) if the type of x matches
4844 float_type. Only do the transformation if we do not need to preserve
4845 trapping behaviour, so require !flag_trapping_math. */
4848 (float (fix_trunc @0))
4849 (if (!flag_trapping_math
4850 && types_match (type, TREE_TYPE (@0))
4851 && direct_internal_fn_supported_p (IFN_TRUNC, type,
4856 /* If we have a narrowing conversion to an integral type that is fed by a
4857 BIT_AND_EXPR, we might be able to remove the BIT_AND_EXPR if it merely
4858 masks off bits outside the final type (and nothing else). */
4860 (convert (bit_and @0 INTEGER_CST@1))
4861 (if (INTEGRAL_TYPE_P (type)
4862 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
4863 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))
4864 && operand_equal_p (@1, build_low_bits_mask (TREE_TYPE (@1),
4865 TYPE_PRECISION (type)), 0))
4869 /* (X /[ex] A) * A -> X. */
4871 (mult (convert1? (exact_div @0 @@1)) (convert2? @1))
4874 /* Simplify (A / B) * B + (A % B) -> A. */
4875 (for div (trunc_div ceil_div floor_div round_div)
4876 mod (trunc_mod ceil_mod floor_mod round_mod)
4878 (plus:c (mult:c (div @0 @1) @1) (mod @0 @1))
4881 /* x / y * y == x -> x % y == 0. */
4883 (eq:c (mult:c (trunc_div:s @0 @1) @1) @0)
4884 (if (TREE_CODE (TREE_TYPE (@0)) != COMPLEX_TYPE)
4885 (eq (trunc_mod @0 @1) { build_zero_cst (TREE_TYPE (@0)); })))
4887 /* ((X /[ex] A) +- B) * A --> X +- A * B. */
4888 (for op (plus minus)
4890 (mult (convert1? (op (convert2? (exact_div @0 INTEGER_CST@@1)) INTEGER_CST@2)) @1)
4891 (if (tree_nop_conversion_p (type, TREE_TYPE (@2))
4892 && tree_nop_conversion_p (TREE_TYPE (@0), TREE_TYPE (@2)))
4895 wi::overflow_type overflow;
4896 wide_int mul = wi::mul (wi::to_wide (@1), wi::to_wide (@2),
4897 TYPE_SIGN (type), &overflow);
4899 (if (types_match (type, TREE_TYPE (@2))
4900 && types_match (TREE_TYPE (@0), TREE_TYPE (@2)) && !overflow)
4901 (op @0 { wide_int_to_tree (type, mul); })
4902 (with { tree utype = unsigned_type_for (type); }
4903 (convert (op (convert:utype @0)
4904 (mult (convert:utype @1) (convert:utype @2))))))))))
4906 /* Canonicalization of binary operations. */
4908 /* Convert X + -C into X - C. */
4910 (plus @0 REAL_CST@1)
4911 (if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1)))
4912 (with { tree tem = const_unop (NEGATE_EXPR, type, @1); }
4913 (if (!TREE_OVERFLOW (tem) || !flag_trapping_math)
4914 (minus @0 { tem; })))))
4916 /* Convert x+x into x*2. */
4919 (if (SCALAR_FLOAT_TYPE_P (type))
4920 (mult @0 { build_real (type, dconst2); })
4921 (if (INTEGRAL_TYPE_P (type))
4922 (mult @0 { build_int_cst (type, 2); }))))
4926 (minus integer_zerop @1)
4929 (pointer_diff integer_zerop @1)
4930 (negate (convert @1)))
4932 /* (ARG0 - ARG1) is the same as (-ARG1 + ARG0). So check whether
4933 ARG0 is zero and X + ARG0 reduces to X, since that would mean
4934 (-ARG1 + ARG0) reduces to -ARG1. */
4936 (minus real_zerop@0 @1)
4937 (if (fold_real_zero_addition_p (type, @1, @0, 0))
4940 /* Transform x * -1 into -x. */
4942 (mult @0 integer_minus_onep)
4945 /* Reassociate (X * CST) * Y to (X * Y) * CST. This does not introduce
4946 signed overflow for CST != 0 && CST != -1. */
4948 (mult:c (mult:s@3 @0 INTEGER_CST@1) @2)
4949 (if (TREE_CODE (@2) != INTEGER_CST
4951 && !integer_zerop (@1) && !integer_minus_onep (@1))
4952 (mult (mult @0 @2) @1)))
4954 /* True if we can easily extract the real and imaginary parts of a complex
4956 (match compositional_complex
4957 (convert? (complex @0 @1)))
4959 /* COMPLEX_EXPR and REALPART/IMAGPART_EXPR cancellations. */
4961 (complex (realpart @0) (imagpart @0))
4964 (realpart (complex @0 @1))
4967 (imagpart (complex @0 @1))
4970 /* Sometimes we only care about half of a complex expression. */
4972 (realpart (convert?:s (conj:s @0)))
4973 (convert (realpart @0)))
4975 (imagpart (convert?:s (conj:s @0)))
4976 (convert (negate (imagpart @0))))
4977 (for part (realpart imagpart)
4978 (for op (plus minus)
4980 (part (convert?:s@2 (op:s @0 @1)))
4981 (convert (op (part @0) (part @1))))))
4983 (realpart (convert?:s (CEXPI:s @0)))
4986 (imagpart (convert?:s (CEXPI:s @0)))
4989 /* conj(conj(x)) -> x */
4991 (conj (convert? (conj @0)))
4992 (if (tree_nop_conversion_p (TREE_TYPE (@0), type))
4995 /* conj({x,y}) -> {x,-y} */
4997 (conj (convert?:s (complex:s @0 @1)))
4998 (with { tree itype = TREE_TYPE (type); }
4999 (complex (convert:itype @0) (negate (convert:itype @1)))))
5001 /* BSWAP simplifications, transforms checked by gcc.dg/builtin-bswap-8.c. */
5007 (bswap (bit_not (bswap @0)))
5009 (for bitop (bit_xor bit_ior bit_and)
5011 (bswap (bitop:c (bswap @0) @1))
5012 (bitop @0 (bswap @1))))
5015 (cmp (bswap@2 @0) (bswap @1))
5016 (with { tree ctype = TREE_TYPE (@2); }
5017 (cmp (convert:ctype @0) (convert:ctype @1))))
5019 (cmp (bswap @0) INTEGER_CST@1)
5020 (with { tree ctype = TREE_TYPE (@1); }
5021 (cmp (convert:ctype @0) (bswap! @1)))))
5022 /* (bswap(x) >> C1) & C2 can sometimes be simplified to (x >> C3) & C2. */
5024 (bit_and (convert1? (rshift@0 (convert2? (bswap@4 @1)) INTEGER_CST@2))
5026 (if (BITS_PER_UNIT == 8
5027 && tree_fits_uhwi_p (@2)
5028 && tree_fits_uhwi_p (@3))
5031 unsigned HOST_WIDE_INT prec = TYPE_PRECISION (TREE_TYPE (@4));
5032 unsigned HOST_WIDE_INT bits = tree_to_uhwi (@2);
5033 unsigned HOST_WIDE_INT mask = tree_to_uhwi (@3);
5034 unsigned HOST_WIDE_INT lo = bits & 7;
5035 unsigned HOST_WIDE_INT hi = bits - lo;
5038 && mask < (256u>>lo)
5039 && bits < TYPE_PRECISION (TREE_TYPE(@0)))
5040 (with { unsigned HOST_WIDE_INT ns = (prec - (hi + 8)) + lo; }
5042 (bit_and (convert @1) @3)
5045 tree utype = unsigned_type_for (TREE_TYPE (@1));
5046 tree nst = build_int_cst (integer_type_node, ns);
5048 (bit_and (convert (rshift:utype (convert:utype @1) {nst;})) @3))))))))
5049 /* bswap(x) >> C1 can sometimes be simplified to (T)x >> C2. */
5051 (rshift (convert? (bswap@2 @0)) INTEGER_CST@1)
5052 (if (BITS_PER_UNIT == 8
5053 && CHAR_TYPE_SIZE == 8
5054 && tree_fits_uhwi_p (@1))
5057 unsigned HOST_WIDE_INT prec = TYPE_PRECISION (TREE_TYPE (@2));
5058 unsigned HOST_WIDE_INT bits = tree_to_uhwi (@1);
5059 /* If the bswap was extended before the original shift, this
5060 byte (shift) has the sign of the extension, not the sign of
5061 the original shift. */
5062 tree st = TYPE_PRECISION (type) > prec ? TREE_TYPE (@2) : type;
5064 /* Special case: logical right shift of sign-extended bswap.
5065 (unsigned)(short)bswap16(x)>>12 is (unsigned)((short)x<<8)>>12. */
5066 (if (TYPE_PRECISION (type) > prec
5067 && !TYPE_UNSIGNED (TREE_TYPE (@2))
5068 && TYPE_UNSIGNED (type)
5069 && bits < prec && bits + 8 >= prec)
5070 (with { tree nst = build_int_cst (integer_type_node, prec - 8); }
5071 (rshift (convert (lshift:st (convert:st @0) {nst;})) @1))
5072 (if (bits + 8 == prec)
5073 (if (TYPE_UNSIGNED (st))
5074 (convert (convert:unsigned_char_type_node @0))
5075 (convert (convert:signed_char_type_node @0)))
5076 (if (bits < prec && bits + 8 > prec)
5079 tree nst = build_int_cst (integer_type_node, bits & 7);
5080 tree bt = TYPE_UNSIGNED (st) ? unsigned_char_type_node
5081 : signed_char_type_node;
5083 (convert (rshift:bt (convert:bt @0) {nst;})))))))))
5084 /* bswap(x) & C1 can sometimes be simplified to (x >> C2) & C1. */
5086 (bit_and (convert? (bswap@2 @0)) INTEGER_CST@1)
5087 (if (BITS_PER_UNIT == 8
5088 && tree_fits_uhwi_p (@1)
5089 && tree_to_uhwi (@1) < 256)
5092 unsigned HOST_WIDE_INT prec = TYPE_PRECISION (TREE_TYPE (@2));
5093 tree utype = unsigned_type_for (TREE_TYPE (@0));
5094 tree nst = build_int_cst (integer_type_node, prec - 8);
5096 (bit_and (convert (rshift:utype (convert:utype @0) {nst;})) @1)))))
5099 /* Combine COND_EXPRs and VEC_COND_EXPRs. */
5101 /* Simplify constant conditions.
5102 Only optimize constant conditions when the selected branch
5103 has the same type as the COND_EXPR. This avoids optimizing
5104 away "c ? x : throw", where the throw has a void type.
5105 Note that we cannot throw away the fold-const.cc variant nor
5106 this one as we depend on doing this transform before possibly
5107 A ? B : B -> B triggers and the fold-const.cc one can optimize
5108 0 ? A : B to B even if A has side-effects. Something
5109 genmatch cannot handle. */
5111 (cond INTEGER_CST@0 @1 @2)
5112 (if (integer_zerop (@0))
5113 (if (!VOID_TYPE_P (TREE_TYPE (@2)) || VOID_TYPE_P (type))
5115 (if (!VOID_TYPE_P (TREE_TYPE (@1)) || VOID_TYPE_P (type))
5118 (vec_cond VECTOR_CST@0 @1 @2)
5119 (if (integer_all_onesp (@0))
5121 (if (integer_zerop (@0))
5124 /* Sink unary operations to branches, but only if we do fold both. */
5125 (for op (negate bit_not abs absu)
5127 (op (vec_cond:s @0 @1 @2))
5128 (vec_cond @0 (op! @1) (op! @2))))
5130 /* Sink unary conversions to branches, but only if we do fold both
5131 and the target's truth type is the same as we already have. */
5133 (convert (vec_cond:s @0 @1 @2))
5134 (if (VECTOR_TYPE_P (type)
5135 && types_match (TREE_TYPE (@0), truth_type_for (type)))
5136 (vec_cond @0 (convert! @1) (convert! @2))))
5138 /* Likewise for view_convert of nop_conversions. */
5140 (view_convert (vec_cond:s @0 @1 @2))
5141 (if (VECTOR_TYPE_P (type) && VECTOR_TYPE_P (TREE_TYPE (@1))
5142 && known_eq (TYPE_VECTOR_SUBPARTS (type),
5143 TYPE_VECTOR_SUBPARTS (TREE_TYPE (@1)))
5144 && tree_nop_conversion_p (TREE_TYPE (type), TREE_TYPE (TREE_TYPE (@1))))
5145 (vec_cond @0 (view_convert! @1) (view_convert! @2))))
5147 /* Sink binary operation to branches, but only if we can fold it. */
5148 (for op (tcc_comparison plus minus mult bit_and bit_ior bit_xor
5149 lshift rshift rdiv trunc_div ceil_div floor_div round_div
5150 trunc_mod ceil_mod floor_mod round_mod min max)
5151 /* (c ? a : b) op (c ? d : e) --> c ? (a op d) : (b op e) */
5153 (op (vec_cond:s @0 @1 @2) (vec_cond:s @0 @3 @4))
5154 (if (TREE_CODE_CLASS (op) != tcc_comparison
5155 || types_match (type, TREE_TYPE (@1))
5156 || expand_vec_cond_expr_p (type, TREE_TYPE (@0), ERROR_MARK))
5157 (vec_cond @0 (op! @1 @3) (op! @2 @4))))
5159 /* (c ? a : b) op d --> c ? (a op d) : (b op d) */
5161 (op (vec_cond:s @0 @1 @2) @3)
5162 (if (TREE_CODE_CLASS (op) != tcc_comparison
5163 || types_match (type, TREE_TYPE (@1))
5164 || expand_vec_cond_expr_p (type, TREE_TYPE (@0), ERROR_MARK))
5165 (vec_cond @0 (op! @1 @3) (op! @2 @3))))
5167 (op @3 (vec_cond:s @0 @1 @2))
5168 (if (TREE_CODE_CLASS (op) != tcc_comparison
5169 || types_match (type, TREE_TYPE (@1))
5170 || expand_vec_cond_expr_p (type, TREE_TYPE (@0), ERROR_MARK))
5171 (vec_cond @0 (op! @3 @1) (op! @3 @2)))))
5174 (match (nop_atomic_bit_test_and_p @0 @1 @4)
5175 (bit_and (convert?@4 (ATOMIC_FETCH_OR_XOR_N @2 INTEGER_CST@0 @3))
5178 int ibit = tree_log2 (@0);
5179 int ibit2 = tree_log2 (@1);
5183 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))))))
5185 (match (nop_atomic_bit_test_and_p @0 @1 @3)
5186 (bit_and (convert?@3 (SYNC_FETCH_OR_XOR_N @2 INTEGER_CST@0))
5189 int ibit = tree_log2 (@0);
5190 int ibit2 = tree_log2 (@1);
5194 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))))))
5196 (match (nop_atomic_bit_test_and_p @0 @0 @4)
5199 (ATOMIC_FETCH_OR_XOR_N @2 (nop_convert? (lshift@0 integer_onep@5 @6)) @3))
5201 (if (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0)))))
5203 (match (nop_atomic_bit_test_and_p @0 @0 @4)
5206 (SYNC_FETCH_OR_XOR_N @2 (nop_convert? (lshift@0 integer_onep@3 @5))))
5208 (if (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0)))))
5210 (match (nop_atomic_bit_test_and_p @0 @1 @3)
5211 (bit_and@4 (convert?@3 (ATOMIC_FETCH_AND_N @2 INTEGER_CST@0 @5))
5214 int ibit = wi::exact_log2 (wi::zext (wi::bit_not (wi::to_wide (@0)),
5215 TYPE_PRECISION(type)));
5216 int ibit2 = tree_log2 (@1);
5220 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))))))
5222 (match (nop_atomic_bit_test_and_p @0 @1 @3)
5224 (convert?@3 (SYNC_FETCH_AND_AND_N @2 INTEGER_CST@0))
5227 int ibit = wi::exact_log2 (wi::zext (wi::bit_not (wi::to_wide (@0)),
5228 TYPE_PRECISION(type)));
5229 int ibit2 = tree_log2 (@1);
5233 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))))))
5235 (match (nop_atomic_bit_test_and_p @4 @0 @3)
5238 (ATOMIC_FETCH_AND_N @2 (nop_convert?@4 (bit_not (lshift@0 integer_onep@6 @7))) @5))
5240 (if (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@4)))))
5242 (match (nop_atomic_bit_test_and_p @4 @0 @3)
5245 (SYNC_FETCH_AND_AND_N @2 (nop_convert?@4 (bit_not (lshift@0 integer_onep@6 @7)))))
5247 (if (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@4)))))
5251 /* (v ? w : 0) ? a : b is just (v & w) ? a : b
5252 Currently disabled after pass lvec because ARM understands
5253 VEC_COND_EXPR<v==w,-1,0> but not a plain v==w fed to BIT_IOR_EXPR. */
5255 /* These can only be done in gimple as fold likes to convert:
5256 (CMP) & N into (CMP) ? N : 0
5257 and we try to match the same pattern again and again. */
5259 (vec_cond (vec_cond:s @0 @3 integer_zerop) @1 @2)
5260 (if (optimize_vectors_before_lowering_p () && types_match (@0, @3))
5261 (vec_cond (bit_and @0 @3) @1 @2)))
5263 (vec_cond (vec_cond:s @0 integer_all_onesp @3) @1 @2)
5264 (if (optimize_vectors_before_lowering_p () && types_match (@0, @3))
5265 (vec_cond (bit_ior @0 @3) @1 @2)))
5267 (vec_cond (vec_cond:s @0 integer_zerop @3) @1 @2)
5268 (if (optimize_vectors_before_lowering_p () && types_match (@0, @3))
5269 (vec_cond (bit_ior @0 (bit_not @3)) @2 @1)))
5271 (vec_cond (vec_cond:s @0 @3 integer_all_onesp) @1 @2)
5272 (if (optimize_vectors_before_lowering_p () && types_match (@0, @3))
5273 (vec_cond (bit_and @0 (bit_not @3)) @2 @1)))
5275 /* ((VCE (a cmp b ? -1 : 0)) < 0) ? c : d is just
5276 (VCE ((a cmp b) ? (VCE c) : (VCE d))) when TYPE_PRECISION of the
5277 component type of the outer vec_cond is greater equal the inner one. */
5278 (for cmp (simple_comparison)
5281 (lt (view_convert@5 (vec_cond@6 (cmp@4 @0 @1)
5284 integer_zerop) @2 @3)
5285 (if (VECTOR_INTEGER_TYPE_P (TREE_TYPE (@0))
5286 && VECTOR_INTEGER_TYPE_P (TREE_TYPE (@5))
5287 && !TYPE_UNSIGNED (TREE_TYPE (@5))
5288 && VECTOR_TYPE_P (TREE_TYPE (@6))
5289 && VECTOR_TYPE_P (type)
5290 && tree_int_cst_le (TYPE_SIZE (TREE_TYPE (type)),
5291 TYPE_SIZE (TREE_TYPE (TREE_TYPE (@6))))
5292 && TYPE_SIZE (type) == TYPE_SIZE (TREE_TYPE (@6)))
5293 (with { tree vtype = TREE_TYPE (@6);}
5295 (vec_cond @4 (view_convert:vtype @2) (view_convert:vtype @3)))))))
5297 /* c1 ? c2 ? a : b : b --> (c1 & c2) ? a : b */
5299 (vec_cond @0 (vec_cond:s @1 @2 @3) @3)
5300 (if (optimize_vectors_before_lowering_p () && types_match (@0, @1))
5301 (vec_cond (bit_and @0 @1) @2 @3)))
5303 (vec_cond @0 @2 (vec_cond:s @1 @2 @3))
5304 (if (optimize_vectors_before_lowering_p () && types_match (@0, @1))
5305 (vec_cond (bit_ior @0 @1) @2 @3)))
5307 (vec_cond @0 (vec_cond:s @1 @2 @3) @2)
5308 (if (optimize_vectors_before_lowering_p () && types_match (@0, @1))
5309 (vec_cond (bit_ior (bit_not @0) @1) @2 @3)))
5311 (vec_cond @0 @3 (vec_cond:s @1 @2 @3))
5312 (if (optimize_vectors_before_lowering_p () && types_match (@0, @1))
5313 (vec_cond (bit_and (bit_not @0) @1) @2 @3)))
5316 /* Canonicalize mask ? { 0, ... } : { -1, ...} to ~mask if the mask
5317 types are compatible. */
5319 (vec_cond @0 VECTOR_CST@1 VECTOR_CST@2)
5320 (if (VECTOR_BOOLEAN_TYPE_P (type)
5321 && types_match (type, TREE_TYPE (@0)))
5322 (if (integer_zerop (@1) && integer_all_onesp (@2))
5324 (if (integer_all_onesp (@1) && integer_zerop (@2))
5327 /* A few simplifications of "a ? CST1 : CST2". */
5328 /* NOTE: Only do this on gimple as the if-chain-to-switch
5329 optimization depends on the gimple to have if statements in it. */
5332 (cond @0 INTEGER_CST@1 INTEGER_CST@2)
5334 (if (integer_zerop (@2))
5336 /* a ? 1 : 0 -> a if 0 and 1 are integral types. */
5337 (if (integer_onep (@1))
5338 (convert (convert:boolean_type_node @0)))
5339 /* a ? -1 : 0 -> -a. */
5340 (if (INTEGRAL_TYPE_P (type) && integer_all_onesp (@1))
5341 (if (TYPE_PRECISION (type) == 1)
5342 /* For signed 1-bit precision just cast bool to the type. */
5343 (convert (convert:boolean_type_node @0))
5344 (if (TREE_CODE (type) == BOOLEAN_TYPE)
5346 tree intt = build_nonstandard_integer_type (TYPE_PRECISION (type),
5347 TYPE_UNSIGNED (type));
5349 (convert (negate (convert:intt (convert:boolean_type_node @0)))))
5350 (negate (convert:type (convert:boolean_type_node @0))))))
5351 /* a ? powerof2cst : 0 -> a << (log2(powerof2cst)) */
5352 (if (INTEGRAL_TYPE_P (type) && integer_pow2p (@1))
5354 tree shift = build_int_cst (integer_type_node, tree_log2 (@1));
5356 (lshift (convert (convert:boolean_type_node @0)) { shift; })))))
5357 (if (integer_zerop (@1))
5359 /* a ? 0 : 1 -> !a. */
5360 (if (integer_onep (@2))
5361 (convert (bit_xor (convert:boolean_type_node @0) { boolean_true_node; })))
5362 /* a ? 0 : -1 -> -(!a). */
5363 (if (INTEGRAL_TYPE_P (type) && integer_all_onesp (@2))
5364 (if (TYPE_PRECISION (type) == 1)
5365 /* For signed 1-bit precision just cast bool to the type. */
5366 (convert (bit_xor (convert:boolean_type_node @0) { boolean_true_node; }))
5367 (if (TREE_CODE (type) == BOOLEAN_TYPE)
5369 tree intt = build_nonstandard_integer_type (TYPE_PRECISION (type),
5370 TYPE_UNSIGNED (type));
5372 (convert (negate (convert:intt (bit_xor (convert:boolean_type_node @0)
5373 { boolean_true_node; })))))
5374 (negate (convert:type (bit_xor (convert:boolean_type_node @0)
5375 { boolean_true_node; }))))))
5376 /* a ? 0 : powerof2cst -> (!a) << (log2(powerof2cst)) */
5377 (if (INTEGRAL_TYPE_P (type) && integer_pow2p (@2))
5379 tree shift = build_int_cst (integer_type_node, tree_log2 (@2));
5381 (lshift (convert (bit_xor (convert:boolean_type_node @0)
5382 { boolean_true_node; })) { shift; })))))))
5384 /* (a > 1) ? 0 : (cast)a is the same as (cast)(a == 1)
5385 for unsigned types. */
5387 (cond (gt @0 integer_onep@1) integer_zerop (convert? @2))
5388 (if (TYPE_UNSIGNED (TREE_TYPE (@0))
5389 && bitwise_equal_p (@0, @2))
5390 (convert (eq @0 @1))
5394 /* (a <= 1) & (cast)a is the same as (cast)(a == 1)
5395 for unsigned types. */
5397 (bit_and:c (convert1? (le @0 integer_onep@1)) (convert2? @2))
5398 (if (TYPE_UNSIGNED (TREE_TYPE (@0))
5399 && bitwise_equal_p (@0, @2))
5400 (convert (eq @0 @1))
5404 /* `(a == CST) & a` can be simplified to `0` or `(a == CST)` depending
5405 on the first bit of the CST. */
5407 (bit_and:c (convert@2 (eq @0 INTEGER_CST@1)) (convert? @0))
5408 (if ((wi::to_wide (@1) & 1) != 0)
5410 { build_zero_cst (type); }))
5413 # x_5 in range [cst1, cst2] where cst2 = cst1 + 1
5414 x_5 == cstN ? cst4 : cst3
5415 # op is == or != and N is 1 or 2
5416 to r_6 = x_5 + (min (cst3, cst4) - cst1) or
5417 r_6 = (min (cst3, cst4) + cst1) - x_5 depending on op, N and which
5418 of cst3 and cst4 is smaller.
5419 This was originally done by two_value_replacement in phiopt (PR 88676). */
5422 (cond (eqne SSA_NAME@0 INTEGER_CST@1) INTEGER_CST@2 INTEGER_CST@3)
5423 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
5424 && INTEGRAL_TYPE_P (type)
5425 && (wi::to_widest (@2) + 1 == wi::to_widest (@3)
5426 || wi::to_widest (@2) == wi::to_widest (@3) + 1))
5429 get_range_query (cfun)->range_of_expr (r, @0);
5430 if (r.undefined_p ())
5431 r.set_varying (TREE_TYPE (@0));
5433 wide_int min = r.lower_bound ();
5434 wide_int max = r.upper_bound ();
5437 && (wi::to_wide (@1) == min
5438 || wi::to_wide (@1) == max))
5440 tree arg0 = @2, arg1 = @3;
5442 if ((eqne == EQ_EXPR) ^ (wi::to_wide (@1) == min))
5443 std::swap (arg0, arg1);
5444 if (TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (type))
5445 type1 = TREE_TYPE (@0);
5448 auto prec = TYPE_PRECISION (type1);
5449 auto unsign = TYPE_UNSIGNED (type1);
5450 if (TREE_CODE (type1) == BOOLEAN_TYPE)
5451 type1 = build_nonstandard_integer_type (prec, unsign);
5452 min = wide_int::from (min, prec,
5453 TYPE_SIGN (TREE_TYPE (@0)));
5454 wide_int a = wide_int::from (wi::to_wide (arg0), prec,
5456 enum tree_code code;
5457 wi::overflow_type ovf;
5458 if (tree_int_cst_lt (arg0, arg1))
5464 /* lhs is known to be in range [min, min+1] and we want to add a
5465 to it. Check if that operation can overflow for those 2 values
5466 and if yes, force unsigned type. */
5467 wi::add (min + (wi::neg_p (a) ? 0 : 1), a, SIGNED, &ovf);
5469 type1 = unsigned_type_for (type1);
5478 /* lhs is known to be in range [min, min+1] and we want to subtract
5479 it from a. Check if that operation can overflow for those 2
5480 values and if yes, force unsigned type. */
5481 wi::sub (a, min + (wi::neg_p (min) ? 0 : 1), SIGNED, &ovf);
5483 type1 = unsigned_type_for (type1);
5486 tree arg = wide_int_to_tree (type1, a);
5488 (if (code == PLUS_EXPR)
5489 (convert (plus (convert:type1 @0) { arg; }))
5490 (convert (minus { arg; } (convert:type1 @0))))))))))
5494 (convert (cond@0 @1 INTEGER_CST@2 INTEGER_CST@3))
5495 (if (INTEGRAL_TYPE_P (type)
5496 && INTEGRAL_TYPE_P (TREE_TYPE (@0)))
5497 (cond @1 (convert @2) (convert @3))))
5499 /* Simplification moved from fold_cond_expr_with_comparison. It may also
5501 /* This pattern implements two kinds simplification:
5504 (cond (cmp (convert1? x) c1) (convert2? x) c2) -> (minmax (x c)) if:
5505 1) Conversions are type widening from smaller type.
5506 2) Const c1 equals to c2 after canonicalizing comparison.
5507 3) Comparison has tree code LT, LE, GT or GE.
5508 This specific pattern is needed when (cmp (convert x) c) may not
5509 be simplified by comparison patterns because of multiple uses of
5510 x. It also makes sense here because simplifying across multiple
5511 referred var is always benefitial for complicated cases.
5514 (cond (eq (convert1? x) c1) (convert2? x) c2) -> (cond (eq x c1) c1 c2). */
5515 (for cmp (lt le gt ge eq ne)
5517 (cond (cmp (convert1? @1) INTEGER_CST@3) (convert2? @1) INTEGER_CST@2)
5520 tree from_type = TREE_TYPE (@1);
5521 tree c1_type = TREE_TYPE (@3), c2_type = TREE_TYPE (@2);
5522 enum tree_code code = ERROR_MARK;
5524 if (INTEGRAL_TYPE_P (from_type)
5525 && int_fits_type_p (@2, from_type)
5526 && (types_match (c1_type, from_type)
5527 || (TYPE_PRECISION (c1_type) > TYPE_PRECISION (from_type)
5528 && (TYPE_UNSIGNED (from_type)
5529 || TYPE_SIGN (c1_type) == TYPE_SIGN (from_type))))
5530 && (types_match (c2_type, from_type)
5531 || (TYPE_PRECISION (c2_type) > TYPE_PRECISION (from_type)
5532 && (TYPE_UNSIGNED (from_type)
5533 || TYPE_SIGN (c2_type) == TYPE_SIGN (from_type)))))
5536 code = minmax_from_comparison (cmp, @1, @3, @1, @2);
5537 /* Can do A == C1 ? A : C2 -> A == C1 ? C1 : C2? */
5538 else if (int_fits_type_p (@3, from_type))
5542 (if (code == MAX_EXPR)
5543 (convert (max @1 (convert @2)))
5544 (if (code == MIN_EXPR)
5545 (convert (min @1 (convert @2)))
5546 (if (code == EQ_EXPR)
5547 (convert (cond (eq @1 (convert @3))
5548 (convert:from_type @3) (convert:from_type @2)))))))))
5550 /* (cond (cmp (convert? x) c1) (op x c2) c3) -> (op (minmax x c1) c2) if:
5552 1) OP is PLUS or MINUS.
5553 2) CMP is LT, LE, GT or GE.
5554 3) C3 == (C1 op C2), and computation doesn't have undefined behavior.
5556 This pattern also handles special cases like:
5558 A) Operand x is a unsigned to signed type conversion and c1 is
5559 integer zero. In this case,
5560 (signed type)x < 0 <=> x > MAX_VAL(signed type)
5561 (signed type)x >= 0 <=> x <= MAX_VAL(signed type)
5562 B) Const c1 may not equal to (C3 op' C2). In this case we also
5563 check equality for (c1+1) and (c1-1) by adjusting comparison
5566 TODO: Though signed type is handled by this pattern, it cannot be
5567 simplified at the moment because C standard requires additional
5568 type promotion. In order to match&simplify it here, the IR needs
5569 to be cleaned up by other optimizers, i.e, VRP. */
5570 (for op (plus minus)
5571 (for cmp (lt le gt ge)
5573 (cond (cmp (convert? @X) INTEGER_CST@1) (op @X INTEGER_CST@2) INTEGER_CST@3)
5574 (with { tree from_type = TREE_TYPE (@X), to_type = TREE_TYPE (@1); }
5575 (if (types_match (from_type, to_type)
5576 /* Check if it is special case A). */
5577 || (TYPE_UNSIGNED (from_type)
5578 && !TYPE_UNSIGNED (to_type)
5579 && TYPE_PRECISION (from_type) == TYPE_PRECISION (to_type)
5580 && integer_zerop (@1)
5581 && (cmp == LT_EXPR || cmp == GE_EXPR)))
5584 wi::overflow_type overflow = wi::OVF_NONE;
5585 enum tree_code code, cmp_code = cmp;
5587 wide_int c1 = wi::to_wide (@1);
5588 wide_int c2 = wi::to_wide (@2);
5589 wide_int c3 = wi::to_wide (@3);
5590 signop sgn = TYPE_SIGN (from_type);
5592 /* Handle special case A), given x of unsigned type:
5593 ((signed type)x < 0) <=> (x > MAX_VAL(signed type))
5594 ((signed type)x >= 0) <=> (x <= MAX_VAL(signed type)) */
5595 if (!types_match (from_type, to_type))
5597 if (cmp_code == LT_EXPR)
5599 if (cmp_code == GE_EXPR)
5601 c1 = wi::max_value (to_type);
5603 /* To simplify this pattern, we require c3 = (c1 op c2). Here we
5604 compute (c3 op' c2) and check if it equals to c1 with op' being
5605 the inverted operator of op. Make sure overflow doesn't happen
5606 if it is undefined. */
5607 if (op == PLUS_EXPR)
5608 real_c1 = wi::sub (c3, c2, sgn, &overflow);
5610 real_c1 = wi::add (c3, c2, sgn, &overflow);
5613 if (!overflow || !TYPE_OVERFLOW_UNDEFINED (from_type))
5615 /* Check if c1 equals to real_c1. Boundary condition is handled
5616 by adjusting comparison operation if necessary. */
5617 if (!wi::cmp (wi::sub (real_c1, 1, sgn, &overflow), c1, sgn)
5620 /* X <= Y - 1 equals to X < Y. */
5621 if (cmp_code == LE_EXPR)
5623 /* X > Y - 1 equals to X >= Y. */
5624 if (cmp_code == GT_EXPR)
5627 if (!wi::cmp (wi::add (real_c1, 1, sgn, &overflow), c1, sgn)
5630 /* X < Y + 1 equals to X <= Y. */
5631 if (cmp_code == LT_EXPR)
5633 /* X >= Y + 1 equals to X > Y. */
5634 if (cmp_code == GE_EXPR)
5637 if (code != cmp_code || !wi::cmp (real_c1, c1, sgn))
5639 if (cmp_code == LT_EXPR || cmp_code == LE_EXPR)
5641 if (cmp_code == GT_EXPR || cmp_code == GE_EXPR)
5646 (if (code == MAX_EXPR)
5647 (op (max @X { wide_int_to_tree (from_type, real_c1); })
5648 { wide_int_to_tree (from_type, c2); })
5649 (if (code == MIN_EXPR)
5650 (op (min @X { wide_int_to_tree (from_type, real_c1); })
5651 { wide_int_to_tree (from_type, c2); })))))))))
5654 /* A >= B ? A : B -> max (A, B) and friends. The code is still
5655 in fold_cond_expr_with_comparison for GENERIC folding with
5656 some extra constraints. */
5657 (for cmp (eq ne le lt unle unlt ge gt unge ungt uneq ltgt)
5659 (cond (cmp:c (nop_convert1?@c0 @0) (nop_convert2?@c1 @1))
5660 (convert3? @0) (convert4? @1))
5661 (if (!HONOR_SIGNED_ZEROS (type)
5662 && (/* Allow widening conversions of the compare operands as data. */
5663 (INTEGRAL_TYPE_P (type)
5664 && types_match (TREE_TYPE (@c0), TREE_TYPE (@0))
5665 && types_match (TREE_TYPE (@c1), TREE_TYPE (@1))
5666 && TYPE_PRECISION (TREE_TYPE (@0)) <= TYPE_PRECISION (type)
5667 && TYPE_PRECISION (TREE_TYPE (@1)) <= TYPE_PRECISION (type))
5668 /* Or sign conversions for the comparison. */
5669 || (types_match (type, TREE_TYPE (@0))
5670 && types_match (type, TREE_TYPE (@1)))))
5672 (if (cmp == EQ_EXPR)
5673 (if (VECTOR_TYPE_P (type))
5676 (if (cmp == NE_EXPR)
5677 (if (VECTOR_TYPE_P (type))
5680 (if (cmp == LE_EXPR || cmp == UNLE_EXPR || cmp == LT_EXPR || cmp == UNLT_EXPR)
5681 (if (!HONOR_NANS (type))
5682 (if (VECTOR_TYPE_P (type))
5683 (view_convert (min @c0 @c1))
5684 (convert (min @c0 @c1)))))
5685 (if (cmp == GE_EXPR || cmp == UNGE_EXPR || cmp == GT_EXPR || cmp == UNGT_EXPR)
5686 (if (!HONOR_NANS (type))
5687 (if (VECTOR_TYPE_P (type))
5688 (view_convert (max @c0 @c1))
5689 (convert (max @c0 @c1)))))
5690 (if (cmp == UNEQ_EXPR)
5691 (if (!HONOR_NANS (type))
5692 (if (VECTOR_TYPE_P (type))
5695 (if (cmp == LTGT_EXPR)
5696 (if (!HONOR_NANS (type))
5697 (if (VECTOR_TYPE_P (type))
5699 (convert @c0))))))))
5701 /* This is for VEC_COND_EXPR
5702 Optimize A < B ? A : B to MIN (A, B)
5703 A > B ? A : B to MAX (A, B). */
5704 (for cmp (lt le ungt unge gt ge unlt unle)
5705 minmax (min min min min max max max max)
5706 MINMAX (MIN_EXPR MIN_EXPR MIN_EXPR MIN_EXPR MAX_EXPR MAX_EXPR MAX_EXPR MAX_EXPR)
5708 (vec_cond (cmp @0 @1) @0 @1)
5709 (if (VECTOR_INTEGER_TYPE_P (type)
5710 && target_supports_op_p (type, MINMAX, optab_vector))
5713 (for cmp (lt le ungt unge gt ge unlt unle)
5714 minmax (max max max max min min min min)
5715 MINMAX (MAX_EXPR MAX_EXPR MAX_EXPR MAX_EXPR MIN_EXPR MIN_EXPR MIN_EXPR MIN_EXPR)
5717 (vec_cond (cmp @0 @1) @1 @0)
5718 (if (VECTOR_INTEGER_TYPE_P (type)
5719 && target_supports_op_p (type, MINMAX, optab_vector))
5723 (for cnd (cond vec_cond)
5724 /* (a != b) ? (a - b) : 0 -> (a - b) */
5726 (cnd (ne:c @0 @1) (minus@2 @0 @1) integer_zerop)
5728 /* (a != b) ? (a ^ b) : 0 -> (a ^ b) */
5730 (cnd (ne:c @0 @1) (bit_xor:c@2 @0 @1) integer_zerop)
5732 /* (a != b) ? (a & b) : a -> (a & b) */
5733 /* (a != b) ? (a | b) : a -> (a | b) */
5734 /* (a != b) ? min(a,b) : a -> min(a,b) */
5735 /* (a != b) ? max(a,b) : a -> max(a,b) */
5736 (for op (bit_and bit_ior min max)
5738 (cnd (ne:c @0 @1) (op:c@2 @0 @1) @0)
5740 /* (a != b) ? (a * b) : (a * a) -> (a * b) */
5741 /* (a != b) ? (a + b) : (a + a) -> (a + b) */
5744 (cnd (ne:c @0 @1) (op@2 @0 @1) (op @0 @0))
5745 (if (ANY_INTEGRAL_TYPE_P (type))
5747 /* (a != b) ? (a + b) : (2 * a) -> (a + b) */
5749 (cnd (ne:c @0 @1) (plus:c@2 @0 @1) (mult @0 uniform_integer_cst_p@3))
5750 (if (wi::to_wide (uniform_integer_cst_p (@3)) == 2)
5754 /* These was part of minmax phiopt. */
5755 /* Optimize (a CMP b) ? minmax<a, c> : minmax<b, c>
5756 to minmax<min/max<a, b>, c> */
5757 (for minmax (min max)
5758 (for cmp (lt le gt ge ne)
5760 (cond (cmp:c @1 @3) (minmax:c @1 @4) (minmax:c @2 @4))
5763 tree_code code = minmax_from_comparison (cmp, @1, @2, @1, @3);
5765 (if (code == MIN_EXPR)
5766 (minmax (min @1 @2) @4)
5767 (if (code == MAX_EXPR)
5768 (minmax (max @1 @2) @4)))))))
5770 /* Optimize (a CMP CST1) ? max<a,CST2> : a */
5771 (for cmp (gt ge lt le)
5772 minmax (min min max max)
5774 (cond (cmp:c @0 @1) (minmax:c@2 @0 @3) @4)
5777 tree_code code = minmax_from_comparison (cmp, @0, @1, @0, @4);
5779 (if ((cmp == LT_EXPR || cmp == LE_EXPR)
5781 && integer_nonzerop (fold_build2 (LE_EXPR, boolean_type_node, @3, @4)))
5783 (if ((cmp == GT_EXPR || cmp == GE_EXPR)
5785 && integer_nonzerop (fold_build2 (GE_EXPR, boolean_type_node, @3, @4)))
5789 /* These patterns should be after min/max detection as simplifications
5790 of `(type)(zero_one ==/!= 0)` to `(type)(zero_one)`
5791 and `(type)(zero_one^1)` are not done yet. See PR 110637.
5792 Even without those, reaching min/max/and/ior faster is better. */
5794 (cond @0 zero_one_valued_p@1 zero_one_valued_p@2)
5796 /* bool0 ? bool1 : 0 -> bool0 & bool1 */
5797 (if (integer_zerop (@2))
5798 (bit_and (convert @0) @1))
5799 /* bool0 ? 0 : bool2 -> (bool0^1) & bool2 */
5800 (if (integer_zerop (@1))
5801 (bit_and (bit_xor (convert @0) { build_one_cst (type); } ) @2))
5802 /* bool0 ? 1 : bool2 -> bool0 | bool2 */
5803 (if (integer_onep (@1))
5804 (bit_ior (convert @0) @2))
5805 /* bool0 ? bool1 : 1 -> (bool0^1) | bool1 */
5806 (if (integer_onep (@2))
5807 (bit_ior (bit_xor (convert @0) @2) @1))
5812 /* X != C1 ? -X : C2 simplifies to -X when -C1 == C2. */
5814 (cond (ne @0 INTEGER_CST@1) (negate@3 @0) INTEGER_CST@2)
5815 (if (!TYPE_SATURATING (type)
5816 && (TYPE_OVERFLOW_WRAPS (type)
5817 || !wi::only_sign_bit_p (wi::to_wide (@1)))
5818 && wi::eq_p (wi::neg (wi::to_wide (@1)), wi::to_wide (@2)))
5821 /* X != C1 ? ~X : C2 simplifies to ~X when ~C1 == C2. */
5823 (cond (ne @0 INTEGER_CST@1) (bit_not@3 @0) INTEGER_CST@2)
5824 (if (wi::eq_p (wi::bit_not (wi::to_wide (@1)), wi::to_wide (@2)))
5827 /* X != C1 ? abs(X) : C2 simplifies to abs(x) when abs(C1) == C2. */
5830 (cond (ne @0 INTEGER_CST@1) (op@3 @0) INTEGER_CST@2)
5831 (if (wi::abs (wi::to_wide (@1)) == wi::to_wide (@2))
5832 (if (op != ABSU_EXPR && wi::only_sign_bit_p (wi::to_wide (@1)))
5833 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
5834 (convert (absu:utype @0)))
5837 /* (X + 1) > Y ? -X : 1 simplifies to X >= Y ? -X : 1 when
5838 X is unsigned, as when X + 1 overflows, X is -1, so -X == 1. */
5840 (cond (gt (plus @0 integer_onep) @1) (negate @0) integer_onep@2)
5841 (if (TYPE_UNSIGNED (type))
5842 (cond (ge @0 @1) (negate @0) @2)))
5844 (for cnd (cond vec_cond)
5845 /* A ? B : (A ? X : C) -> A ? B : C. */
5847 (cnd @0 (cnd @0 @1 @2) @3)
5850 (cnd @0 @1 (cnd @0 @2 @3))
5852 /* A ? B : (!A ? C : X) -> A ? B : C. */
5853 /* ??? This matches embedded conditions open-coded because genmatch
5854 would generate matching code for conditions in separate stmts only.
5855 The following is still important to merge then and else arm cases
5856 from if-conversion. */
5858 (cnd @0 @1 (cnd @2 @3 @4))
5859 (if (inverse_conditions_p (@0, @2))
5862 (cnd @0 (cnd @1 @2 @3) @4)
5863 (if (inverse_conditions_p (@0, @1))
5866 /* A ? B : B -> B. */
5871 /* !A ? B : C -> A ? C : B. */
5873 (cnd (logical_inverted_value truth_valued_p@0) @1 @2)
5876 /* abs/negative simplifications moved from fold_cond_expr_with_comparison.
5878 None of these transformations work for modes with signed
5879 zeros. If A is +/-0, the first two transformations will
5880 change the sign of the result (from +0 to -0, or vice
5881 versa). The last four will fix the sign of the result,
5882 even though the original expressions could be positive or
5883 negative, depending on the sign of A.
5885 Note that all these transformations are correct if A is
5886 NaN, since the two alternatives (A and -A) are also NaNs. */
5888 (for cnd (cond vec_cond)
5889 /* A == 0 ? A : -A same as -A */
5892 (cnd (cmp @0 zerop) @2 (negate@1 @2))
5893 (if (!HONOR_SIGNED_ZEROS (type)
5894 && bitwise_equal_p (@0, @2))
5897 (cnd (cmp @0 zerop) zerop (negate@1 @2))
5898 (if (!HONOR_SIGNED_ZEROS (type)
5899 && bitwise_equal_p (@0, @2))
5902 /* A != 0 ? A : -A same as A */
5905 (cnd (cmp @0 zerop) @1 (negate @1))
5906 (if (!HONOR_SIGNED_ZEROS (type)
5907 && bitwise_equal_p (@0, @1))
5910 (cnd (cmp @0 zerop) @1 integer_zerop)
5911 (if (!HONOR_SIGNED_ZEROS (type)
5912 && bitwise_equal_p (@0, @1))
5915 /* A >=/> 0 ? A : -A same as abs (A) */
5918 (cnd (cmp @0 zerop) @1 (negate @1))
5919 (if (!HONOR_SIGNED_ZEROS (TREE_TYPE(@0))
5920 && !TYPE_UNSIGNED (TREE_TYPE(@0))
5921 && bitwise_equal_p (@0, @1))
5922 (if (TYPE_UNSIGNED (type))
5925 /* A <=/< 0 ? A : -A same as -abs (A) */
5928 (cnd (cmp @0 zerop) @1 (negate @1))
5929 (if (!HONOR_SIGNED_ZEROS (TREE_TYPE(@0))
5930 && !TYPE_UNSIGNED (TREE_TYPE(@0))
5931 && bitwise_equal_p (@0, @1))
5932 (if ((ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
5933 && !TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
5934 || TYPE_UNSIGNED (type))
5936 tree utype = unsigned_type_for (TREE_TYPE(@0));
5938 (convert (negate (absu:utype @0))))
5939 (negate (abs @0)))))
5942 /* (A - B) == 0 ? (A - B) : (B - A) same as (B - A) */
5945 (cnd (cmp (minus@0 @1 @2) zerop) @0 (minus@3 @2 @1))
5946 (if (!HONOR_SIGNED_ZEROS (type))
5949 (cnd (cmp (minus@0 @1 @2) integer_zerop) integer_zerop (minus@3 @2 @1))
5952 /* (A - B) != 0 ? (A - B) : (B - A) same as (A - B) */
5955 (cnd (cmp (minus@0 @1 @2) zerop) @0 (minus @2 @1))
5956 (if (!HONOR_SIGNED_ZEROS (type))
5959 (cnd (cmp (minus@0 @1 @2) integer_zerop) @0 integer_zerop)
5962 /* (A - B) >=/> 0 ? (A - B) : (B - A) same as abs (A - B) */
5965 (cnd (cmp (minus@0 @1 @2) zerop) @0 (minus @2 @1))
5966 (if (!HONOR_SIGNED_ZEROS (type)
5967 && !TYPE_UNSIGNED (type))
5969 /* (A - B) <=/< 0 ? (A - B) : (B - A) same as -abs (A - B) */
5972 (cnd (cmp (minus@0 @1 @2) zerop) @0 (minus @2 @1))
5973 (if (!HONOR_SIGNED_ZEROS (type)
5974 && !TYPE_UNSIGNED (type))
5975 (if (ANY_INTEGRAL_TYPE_P (type)
5976 && !TYPE_OVERFLOW_WRAPS (type))
5978 tree utype = unsigned_type_for (type);
5980 (convert (negate (absu:utype @0))))
5981 (negate (abs @0)))))
5985 /* -(type)!A -> (type)A - 1. */
5987 (negate (convert?:s (logical_inverted_value:s @0)))
5988 (if (INTEGRAL_TYPE_P (type)
5989 && TREE_CODE (type) != BOOLEAN_TYPE
5990 && TYPE_PRECISION (type) > 1
5991 && TREE_CODE (@0) == SSA_NAME
5992 && ssa_name_has_boolean_range (@0))
5993 (plus (convert:type @0) { build_all_ones_cst (type); })))
5995 /* A + (B vcmp C ? 1 : 0) -> A - (B vcmp C ? -1 : 0), since vector comparisons
5996 return all -1 or all 0 results. */
5997 /* ??? We could instead convert all instances of the vec_cond to negate,
5998 but that isn't necessarily a win on its own. */
6000 (plus:c @3 (view_convert? (vec_cond:s @0 integer_each_onep@1 integer_zerop@2)))
6001 (if (VECTOR_TYPE_P (type)
6002 && known_eq (TYPE_VECTOR_SUBPARTS (type),
6003 TYPE_VECTOR_SUBPARTS (TREE_TYPE (@1)))
6004 && (TYPE_MODE (TREE_TYPE (type))
6005 == TYPE_MODE (TREE_TYPE (TREE_TYPE (@1)))))
6006 (minus @3 (view_convert (vec_cond @0 (negate @1) @2)))))
6008 /* ... likewise A - (B vcmp C ? 1 : 0) -> A + (B vcmp C ? -1 : 0). */
6010 (minus @3 (view_convert? (vec_cond:s @0 integer_each_onep@1 integer_zerop@2)))
6011 (if (VECTOR_TYPE_P (type)
6012 && known_eq (TYPE_VECTOR_SUBPARTS (type),
6013 TYPE_VECTOR_SUBPARTS (TREE_TYPE (@1)))
6014 && (TYPE_MODE (TREE_TYPE (type))
6015 == TYPE_MODE (TREE_TYPE (TREE_TYPE (@1)))))
6016 (plus @3 (view_convert (vec_cond @0 (negate @1) @2)))))
6019 /* Simplifications of comparisons. */
6021 /* See if we can reduce the magnitude of a constant involved in a
6022 comparison by changing the comparison code. This is a canonicalization
6023 formerly done by maybe_canonicalize_comparison_1. */
6027 (cmp @0 uniform_integer_cst_p@1)
6028 (with { tree cst = uniform_integer_cst_p (@1); }
6029 (if (tree_int_cst_sgn (cst) == -1)
6030 (acmp @0 { build_uniform_cst (TREE_TYPE (@1),
6031 wide_int_to_tree (TREE_TYPE (cst),
6037 (cmp @0 uniform_integer_cst_p@1)
6038 (with { tree cst = uniform_integer_cst_p (@1); }
6039 (if (tree_int_cst_sgn (cst) == 1)
6040 (acmp @0 { build_uniform_cst (TREE_TYPE (@1),
6041 wide_int_to_tree (TREE_TYPE (cst),
6042 wi::to_wide (cst) - 1)); })))))
6044 /* We can simplify a logical negation of a comparison to the
6045 inverted comparison. As we cannot compute an expression
6046 operator using invert_tree_comparison we have to simulate
6047 that with expression code iteration. */
6048 (for cmp (tcc_comparison)
6049 icmp (inverted_tcc_comparison)
6050 ncmp (inverted_tcc_comparison_with_nans)
6051 /* Ideally we'd like to combine the following two patterns
6052 and handle some more cases by using
6053 (logical_inverted_value (cmp @0 @1))
6054 here but for that genmatch would need to "inline" that.
6055 For now implement what forward_propagate_comparison did. */
6057 (bit_not (cmp @0 @1))
6058 (if (VECTOR_TYPE_P (type)
6059 || (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) == 1))
6060 /* Comparison inversion may be impossible for trapping math,
6061 invert_tree_comparison will tell us. But we can't use
6062 a computed operator in the replacement tree thus we have
6063 to play the trick below. */
6064 (with { enum tree_code ic = invert_tree_comparison
6065 (cmp, HONOR_NANS (@0)); }
6071 (bit_xor (cmp @0 @1) integer_truep)
6072 (with { enum tree_code ic = invert_tree_comparison
6073 (cmp, HONOR_NANS (@0)); }
6078 /* The following bits are handled by fold_binary_op_with_conditional_arg. */
6080 (ne (cmp@2 @0 @1) integer_zerop)
6081 (if (types_match (type, TREE_TYPE (@2)))
6084 (eq (cmp@2 @0 @1) integer_truep)
6085 (if (types_match (type, TREE_TYPE (@2)))
6088 (ne (cmp@2 @0 @1) integer_truep)
6089 (if (types_match (type, TREE_TYPE (@2)))
6090 (with { enum tree_code ic = invert_tree_comparison
6091 (cmp, HONOR_NANS (@0)); }
6097 (eq (cmp@2 @0 @1) integer_zerop)
6098 (if (types_match (type, TREE_TYPE (@2)))
6099 (with { enum tree_code ic = invert_tree_comparison
6100 (cmp, HONOR_NANS (@0)); }
6106 /* Transform comparisons of the form X - Y CMP 0 to X CMP Y.
6107 ??? The transformation is valid for the other operators if overflow
6108 is undefined for the type, but performing it here badly interacts
6109 with the transformation in fold_cond_expr_with_comparison which
6110 attempts to synthetize ABS_EXPR. */
6112 (for sub (minus pointer_diff)
6114 (cmp (sub@2 @0 @1) integer_zerop)
6115 (if (single_use (@2))
6118 /* Simplify (x < 0) ^ (y < 0) to (x ^ y) < 0 and
6119 (x >= 0) ^ (y >= 0) to (x ^ y) < 0. */
6122 (bit_xor (cmp:s @0 integer_zerop) (cmp:s @1 integer_zerop))
6123 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
6124 && !TYPE_UNSIGNED (TREE_TYPE (@0))
6125 && types_match (TREE_TYPE (@0), TREE_TYPE (@1)))
6126 (lt (bit_xor @0 @1) { build_zero_cst (TREE_TYPE (@0)); }))))
6127 /* Simplify (x < 0) ^ (y >= 0) to (x ^ y) >= 0 and
6128 (x >= 0) ^ (y < 0) to (x ^ y) >= 0. */
6130 (bit_xor:c (lt:s @0 integer_zerop) (ge:s @1 integer_zerop))
6131 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
6132 && !TYPE_UNSIGNED (TREE_TYPE (@0))
6133 && types_match (TREE_TYPE (@0), TREE_TYPE (@1)))
6134 (ge (bit_xor @0 @1) { build_zero_cst (TREE_TYPE (@0)); })))
6136 /* Transform comparisons of the form X * C1 CMP 0 to X CMP 0 in the
6137 signed arithmetic case. That form is created by the compiler
6138 often enough for folding it to be of value. One example is in
6139 computing loop trip counts after Operator Strength Reduction. */
6140 (for cmp (simple_comparison)
6141 scmp (swapped_simple_comparison)
6143 (cmp (mult@3 @0 INTEGER_CST@1) integer_zerop@2)
6144 /* Handle unfolded multiplication by zero. */
6145 (if (integer_zerop (@1))
6147 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
6148 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
6150 /* If @1 is negative we swap the sense of the comparison. */
6151 (if (tree_int_cst_sgn (@1) < 0)
6155 /* For integral types with undefined overflow fold
6156 x * C1 == C2 into x == C2 / C1 or false.
6157 If overflow wraps and C1 is odd, simplify to x == C2 / C1 in the ring
6161 (cmp (mult @0 INTEGER_CST@1) INTEGER_CST@2)
6162 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
6163 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
6164 && wi::to_wide (@1) != 0)
6165 (with { widest_int quot; }
6166 (if (wi::multiple_of_p (wi::to_widest (@2), wi::to_widest (@1),
6167 TYPE_SIGN (TREE_TYPE (@0)), "))
6168 (cmp @0 { wide_int_to_tree (TREE_TYPE (@0), quot); })
6169 { constant_boolean_node (cmp == NE_EXPR, type); }))
6170 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
6171 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))
6172 && (wi::bit_and (wi::to_wide (@1), 1) == 1))
6175 tree itype = TREE_TYPE (@0);
6176 int p = TYPE_PRECISION (itype);
6177 wide_int m = wi::one (p + 1) << p;
6178 wide_int a = wide_int::from (wi::to_wide (@1), p + 1, UNSIGNED);
6179 wide_int i = wide_int::from (wi::mod_inv (a, m),
6180 p, TYPE_SIGN (itype));
6181 wide_int_to_tree (itype, wi::mul (i, wi::to_wide (@2)));
6184 /* Simplify comparison of something with itself. For IEEE
6185 floating-point, we can only do some of these simplifications. */
6189 (if (! FLOAT_TYPE_P (TREE_TYPE (@0))
6190 || ! tree_expr_maybe_nan_p (@0))
6191 { constant_boolean_node (true, type); }
6193 /* With -ftrapping-math conversion to EQ loses an exception. */
6194 && (! FLOAT_TYPE_P (TREE_TYPE (@0))
6195 || ! flag_trapping_math))
6201 || ! FLOAT_TYPE_P (TREE_TYPE (@0))
6202 || ! tree_expr_maybe_nan_p (@0))
6203 { constant_boolean_node (false, type); })))
6204 (for cmp (unle unge uneq)
6207 { constant_boolean_node (true, type); }))
6208 (for cmp (unlt ungt)
6214 (if (!flag_trapping_math || !tree_expr_maybe_nan_p (@0))
6215 { constant_boolean_node (false, type); }))
6217 /* x == ~x -> false */
6218 /* x != ~x -> true */
6221 (cmp:c @0 (bit_not @0))
6222 { constant_boolean_node (cmp == NE_EXPR, type); }))
6224 /* Fold ~X op ~Y as Y op X. */
6225 (for cmp (simple_comparison)
6227 (cmp (nop_convert1?@4 (bit_not@2 @0)) (nop_convert2? (bit_not@3 @1)))
6228 (if (single_use (@2) && single_use (@3))
6229 (with { tree otype = TREE_TYPE (@4); }
6230 (cmp (convert:otype @1) (convert:otype @0))))))
6232 /* Fold ~X op C as X op' ~C, where op' is the swapped comparison. */
6233 (for cmp (simple_comparison)
6234 scmp (swapped_simple_comparison)
6236 (cmp (nop_convert? (bit_not@2 @0)) CONSTANT_CLASS_P@1)
6237 (if (single_use (@2)
6238 && (TREE_CODE (@1) == INTEGER_CST || TREE_CODE (@1) == VECTOR_CST))
6239 (with { tree otype = TREE_TYPE (@1); }
6240 (scmp (convert:otype @0) (bit_not @1))))))
6242 (for cmp (simple_comparison)
6245 /* IEEE doesn't distinguish +0 and -0 in comparisons. */
6247 /* a CMP (-0) -> a CMP 0 */
6248 (if (REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (@1)))
6249 (cmp @0 { build_real (TREE_TYPE (@1), dconst0); }))
6250 /* (-0) CMP b -> 0 CMP b. */
6251 (if (TREE_CODE (@0) == REAL_CST
6252 && REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (@0)))
6253 (cmp { build_real (TREE_TYPE (@0), dconst0); } @1))
6254 /* x != NaN is always true, other ops are always false. */
6255 (if (REAL_VALUE_ISNAN (TREE_REAL_CST (@1))
6256 && (cmp == EQ_EXPR || cmp == NE_EXPR || !flag_trapping_math)
6257 && !tree_expr_signaling_nan_p (@1)
6258 && !tree_expr_maybe_signaling_nan_p (@0))
6259 { constant_boolean_node (cmp == NE_EXPR, type); })
6260 /* NaN != y is always true, other ops are always false. */
6261 (if (TREE_CODE (@0) == REAL_CST
6262 && REAL_VALUE_ISNAN (TREE_REAL_CST (@0))
6263 && (cmp == EQ_EXPR || cmp == NE_EXPR || !flag_trapping_math)
6264 && !tree_expr_signaling_nan_p (@0)
6265 && !tree_expr_signaling_nan_p (@1))
6266 { constant_boolean_node (cmp == NE_EXPR, type); })
6267 /* Fold comparisons against infinity. */
6268 (if (REAL_VALUE_ISINF (TREE_REAL_CST (@1))
6269 && MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (@1))))
6272 REAL_VALUE_TYPE max;
6273 enum tree_code code = cmp;
6274 bool neg = REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1));
6276 code = swap_tree_comparison (code);
6279 /* x > +Inf is always false, if we ignore NaNs or exceptions. */
6280 (if (code == GT_EXPR
6281 && !(HONOR_NANS (@0) && flag_trapping_math))
6282 { constant_boolean_node (false, type); })
6283 (if (code == LE_EXPR)
6284 /* x <= +Inf is always true, if we don't care about NaNs. */
6285 (if (! HONOR_NANS (@0))
6286 { constant_boolean_node (true, type); }
6287 /* x <= +Inf is the same as x == x, i.e. !isnan(x), but this loses
6288 an "invalid" exception. */
6289 (if (!flag_trapping_math)
6291 /* x == +Inf and x >= +Inf are always equal to x > DBL_MAX, but
6292 for == this introduces an exception for x a NaN. */
6293 (if ((code == EQ_EXPR && !(HONOR_NANS (@0) && flag_trapping_math))
6295 (with { real_maxval (&max, neg, TYPE_MODE (TREE_TYPE (@0))); }
6297 (lt @0 { build_real (TREE_TYPE (@0), max); })
6298 (gt @0 { build_real (TREE_TYPE (@0), max); }))))
6299 /* x < +Inf is always equal to x <= DBL_MAX. */
6300 (if (code == LT_EXPR)
6301 (with { real_maxval (&max, neg, TYPE_MODE (TREE_TYPE (@0))); }
6303 (ge @0 { build_real (TREE_TYPE (@0), max); })
6304 (le @0 { build_real (TREE_TYPE (@0), max); }))))
6305 /* x != +Inf is always equal to !(x > DBL_MAX), but this introduces
6306 an exception for x a NaN so use an unordered comparison. */
6307 (if (code == NE_EXPR)
6308 (with { real_maxval (&max, neg, TYPE_MODE (TREE_TYPE (@0))); }
6309 (if (! HONOR_NANS (@0))
6311 (ge @0 { build_real (TREE_TYPE (@0), max); })
6312 (le @0 { build_real (TREE_TYPE (@0), max); }))
6314 (unge @0 { build_real (TREE_TYPE (@0), max); })
6315 (unle @0 { build_real (TREE_TYPE (@0), max); }))))))))))
6317 /* If this is a comparison of a real constant with a PLUS_EXPR
6318 or a MINUS_EXPR of a real constant, we can convert it into a
6319 comparison with a revised real constant as long as no overflow
6320 occurs when unsafe_math_optimizations are enabled. */
6321 (if (flag_unsafe_math_optimizations)
6322 (for op (plus minus)
6324 (cmp (op @0 REAL_CST@1) REAL_CST@2)
6327 tree tem = const_binop (op == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR,
6328 TREE_TYPE (@1), @2, @1);
6330 (if (tem && !TREE_OVERFLOW (tem))
6331 (cmp @0 { tem; }))))))
6333 /* Likewise, we can simplify a comparison of a real constant with
6334 a MINUS_EXPR whose first operand is also a real constant, i.e.
6335 (c1 - x) < c2 becomes x > c1-c2. Reordering is allowed on
6336 floating-point types only if -fassociative-math is set. */
6337 (if (flag_associative_math)
6339 (cmp (minus REAL_CST@0 @1) REAL_CST@2)
6340 (with { tree tem = const_binop (MINUS_EXPR, TREE_TYPE (@1), @0, @2); }
6341 (if (tem && !TREE_OVERFLOW (tem))
6342 (cmp { tem; } @1)))))
6344 /* Fold comparisons against built-in math functions. */
6345 (if (flag_unsafe_math_optimizations && ! flag_errno_math)
6348 (cmp (sq @0) REAL_CST@1)
6350 (if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1)))
6352 /* sqrt(x) < y is always false, if y is negative. */
6353 (if (cmp == EQ_EXPR || cmp == LT_EXPR || cmp == LE_EXPR)
6354 { constant_boolean_node (false, type); })
6355 /* sqrt(x) > y is always true, if y is negative and we
6356 don't care about NaNs, i.e. negative values of x. */
6357 (if (cmp == NE_EXPR || !HONOR_NANS (@0))
6358 { constant_boolean_node (true, type); })
6359 /* sqrt(x) > y is the same as x >= 0, if y is negative. */
6360 (ge @0 { build_real (TREE_TYPE (@0), dconst0); })))
6361 (if (real_equal (TREE_REAL_CST_PTR (@1), &dconst0))
6363 /* sqrt(x) < 0 is always false. */
6364 (if (cmp == LT_EXPR)
6365 { constant_boolean_node (false, type); })
6366 /* sqrt(x) >= 0 is always true if we don't care about NaNs. */
6367 (if (cmp == GE_EXPR && !HONOR_NANS (@0))
6368 { constant_boolean_node (true, type); })
6369 /* sqrt(x) <= 0 -> x == 0. */
6370 (if (cmp == LE_EXPR)
6372 /* Otherwise sqrt(x) cmp 0 -> x cmp 0. Here cmp can be >=, >,
6373 == or !=. In the last case:
6375 (sqrt(x) != 0) == (NaN != 0) == true == (x != 0)
6377 if x is negative or NaN. Due to -funsafe-math-optimizations,
6378 the results for other x follow from natural arithmetic. */
6380 (if ((cmp == LT_EXPR
6384 && !REAL_VALUE_ISNAN (TREE_REAL_CST (@1))
6385 /* Give up for -frounding-math. */
6386 && !HONOR_SIGN_DEPENDENT_ROUNDING (TREE_TYPE (@0)))
6390 enum tree_code ncmp = cmp;
6391 const real_format *fmt
6392 = REAL_MODE_FORMAT (TYPE_MODE (TREE_TYPE (@0)));
6393 real_arithmetic (&c2, MULT_EXPR,
6394 &TREE_REAL_CST (@1), &TREE_REAL_CST (@1));
6395 real_convert (&c2, fmt, &c2);
6396 /* See PR91734: if c2 is inexact and sqrt(c2) < c (or sqrt(c2) >= c),
6397 then change LT_EXPR into LE_EXPR or GE_EXPR into GT_EXPR. */
6398 if (!REAL_VALUE_ISINF (c2))
6400 tree c3 = fold_const_call (CFN_SQRT, TREE_TYPE (@0),
6401 build_real (TREE_TYPE (@0), c2));
6402 if (c3 == NULL_TREE || TREE_CODE (c3) != REAL_CST)
6404 else if ((cmp == LT_EXPR || cmp == GE_EXPR)
6405 && real_less (&TREE_REAL_CST (c3), &TREE_REAL_CST (@1)))
6406 ncmp = cmp == LT_EXPR ? LE_EXPR : GT_EXPR;
6407 else if ((cmp == LE_EXPR || cmp == GT_EXPR)
6408 && real_less (&TREE_REAL_CST (@1), &TREE_REAL_CST (c3)))
6409 ncmp = cmp == LE_EXPR ? LT_EXPR : GE_EXPR;
6412 /* With rounding to even, sqrt of up to 3 different values
6413 gives the same normal result, so in some cases c2 needs
6415 REAL_VALUE_TYPE c2alt, tow;
6416 if (cmp == LT_EXPR || cmp == GE_EXPR)
6420 real_nextafter (&c2alt, fmt, &c2, &tow);
6421 real_convert (&c2alt, fmt, &c2alt);
6422 if (REAL_VALUE_ISINF (c2alt))
6426 c3 = fold_const_call (CFN_SQRT, TREE_TYPE (@0),
6427 build_real (TREE_TYPE (@0), c2alt));
6428 if (c3 == NULL_TREE || TREE_CODE (c3) != REAL_CST)
6430 else if (real_equal (&TREE_REAL_CST (c3),
6431 &TREE_REAL_CST (@1)))
6437 (if (cmp == GT_EXPR || cmp == GE_EXPR)
6438 (if (REAL_VALUE_ISINF (c2))
6439 /* sqrt(x) > y is x == +Inf, when y is very large. */
6440 (if (HONOR_INFINITIES (@0))
6441 (eq @0 { build_real (TREE_TYPE (@0), c2); })
6442 { constant_boolean_node (false, type); })
6443 /* sqrt(x) > c is the same as x > c*c. */
6444 (if (ncmp != ERROR_MARK)
6445 (if (ncmp == GE_EXPR)
6446 (ge @0 { build_real (TREE_TYPE (@0), c2); })
6447 (gt @0 { build_real (TREE_TYPE (@0), c2); }))))
6448 /* else if (cmp == LT_EXPR || cmp == LE_EXPR) */
6449 (if (REAL_VALUE_ISINF (c2))
6451 /* sqrt(x) < y is always true, when y is a very large
6452 value and we don't care about NaNs or Infinities. */
6453 (if (! HONOR_NANS (@0) && ! HONOR_INFINITIES (@0))
6454 { constant_boolean_node (true, type); })
6455 /* sqrt(x) < y is x != +Inf when y is very large and we
6456 don't care about NaNs. */
6457 (if (! HONOR_NANS (@0))
6458 (ne @0 { build_real (TREE_TYPE (@0), c2); }))
6459 /* sqrt(x) < y is x >= 0 when y is very large and we
6460 don't care about Infinities. */
6461 (if (! HONOR_INFINITIES (@0))
6462 (ge @0 { build_real (TREE_TYPE (@0), dconst0); }))
6463 /* sqrt(x) < y is x >= 0 && x != +Inf, when y is large. */
6466 (ge @0 { build_real (TREE_TYPE (@0), dconst0); })
6467 (ne @0 { build_real (TREE_TYPE (@0), c2); }))))
6468 /* sqrt(x) < c is the same as x < c*c, if we ignore NaNs. */
6469 (if (ncmp != ERROR_MARK && ! HONOR_NANS (@0))
6470 (if (ncmp == LT_EXPR)
6471 (lt @0 { build_real (TREE_TYPE (@0), c2); })
6472 (le @0 { build_real (TREE_TYPE (@0), c2); }))
6473 /* sqrt(x) < c is the same as x >= 0 && x < c*c. */
6474 (if (ncmp != ERROR_MARK && GENERIC)
6475 (if (ncmp == LT_EXPR)
6477 (ge @0 { build_real (TREE_TYPE (@0), dconst0); })
6478 (lt @0 { build_real (TREE_TYPE (@0), c2); }))
6480 (ge @0 { build_real (TREE_TYPE (@0), dconst0); })
6481 (le @0 { build_real (TREE_TYPE (@0), c2); })))))))))))
6482 /* Transform sqrt(x) cmp sqrt(y) -> x cmp y. */
6484 (cmp (sq @0) (sq @1))
6485 (if (! HONOR_NANS (@0))
6488 /* Optimize various special cases of (FTYPE) N CMP (FTYPE) M. */
6489 (for cmp (lt le eq ne ge gt unordered ordered unlt unle ungt unge uneq ltgt)
6490 icmp (lt le eq ne ge gt unordered ordered lt le gt ge eq ne)
6492 (cmp (float@0 @1) (float @2))
6493 (if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (@0))
6494 && ! DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@0)))
6497 format_helper fmt (REAL_MODE_FORMAT (TYPE_MODE (TREE_TYPE (@0))));
6498 tree type1 = TREE_TYPE (@1);
6499 bool type1_signed_p = TYPE_SIGN (type1) == SIGNED;
6500 tree type2 = TREE_TYPE (@2);
6501 bool type2_signed_p = TYPE_SIGN (type2) == SIGNED;
6503 (if (fmt.can_represent_integral_type_p (type1)
6504 && fmt.can_represent_integral_type_p (type2))
6505 (if (cmp == ORDERED_EXPR || cmp == UNORDERED_EXPR)
6506 { constant_boolean_node (cmp == ORDERED_EXPR, type); }
6507 (if (TYPE_PRECISION (type1) > TYPE_PRECISION (type2)
6508 && type1_signed_p >= type2_signed_p)
6509 (icmp @1 (convert @2))
6510 (if (TYPE_PRECISION (type1) < TYPE_PRECISION (type2)
6511 && type1_signed_p <= type2_signed_p)
6512 (icmp (convert:type2 @1) @2)
6513 (if (TYPE_PRECISION (type1) == TYPE_PRECISION (type2)
6514 && type1_signed_p == type2_signed_p)
6515 (icmp @1 @2))))))))))
6517 /* Optimize various special cases of (FTYPE) N CMP CST. */
6518 (for cmp (lt le eq ne ge gt)
6519 icmp (le le eq ne ge ge)
6521 (cmp (float @0) REAL_CST@1)
6522 (if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (@1))
6523 && ! DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@1)))
6526 tree itype = TREE_TYPE (@0);
6527 format_helper fmt (REAL_MODE_FORMAT (TYPE_MODE (TREE_TYPE (@1))));
6528 const REAL_VALUE_TYPE *cst = TREE_REAL_CST_PTR (@1);
6529 /* Be careful to preserve any potential exceptions due to
6530 NaNs. qNaNs are ok in == or != context.
6531 TODO: relax under -fno-trapping-math or
6532 -fno-signaling-nans. */
6534 = real_isnan (cst) && (cst->signalling
6535 || (cmp != EQ_EXPR && cmp != NE_EXPR));
6537 /* TODO: allow non-fitting itype and SNaNs when
6538 -fno-trapping-math. */
6539 (if (fmt.can_represent_integral_type_p (itype) && ! exception_p)
6542 signop isign = TYPE_SIGN (itype);
6543 REAL_VALUE_TYPE imin, imax;
6544 real_from_integer (&imin, fmt, wi::min_value (itype), isign);
6545 real_from_integer (&imax, fmt, wi::max_value (itype), isign);
6547 REAL_VALUE_TYPE icst;
6548 if (cmp == GT_EXPR || cmp == GE_EXPR)
6549 real_ceil (&icst, fmt, cst);
6550 else if (cmp == LT_EXPR || cmp == LE_EXPR)
6551 real_floor (&icst, fmt, cst);
6553 real_trunc (&icst, fmt, cst);
6555 bool cst_int_p = !real_isnan (cst) && real_identical (&icst, cst);
6557 bool overflow_p = false;
6559 = real_to_integer (&icst, &overflow_p, TYPE_PRECISION (itype));
6562 /* Optimize cases when CST is outside of ITYPE's range. */
6563 (if (real_compare (LT_EXPR, cst, &imin))
6564 { constant_boolean_node (cmp == GT_EXPR || cmp == GE_EXPR || cmp == NE_EXPR,
6566 (if (real_compare (GT_EXPR, cst, &imax))
6567 { constant_boolean_node (cmp == LT_EXPR || cmp == LE_EXPR || cmp == NE_EXPR,
6569 /* Remove cast if CST is an integer representable by ITYPE. */
6571 (cmp @0 { gcc_assert (!overflow_p);
6572 wide_int_to_tree (itype, icst_val); })
6574 /* When CST is fractional, optimize
6575 (FTYPE) N == CST -> 0
6576 (FTYPE) N != CST -> 1. */
6577 (if (cmp == EQ_EXPR || cmp == NE_EXPR)
6578 { constant_boolean_node (cmp == NE_EXPR, type); })
6579 /* Otherwise replace with sensible integer constant. */
6582 gcc_checking_assert (!overflow_p);
6584 (icmp @0 { wide_int_to_tree (itype, icst_val); })))))))))
6586 /* Fold A /[ex] B CMP C to A CMP B * C. */
6589 (cmp (exact_div @0 @1) INTEGER_CST@2)
6590 (if (!integer_zerop (@1))
6591 (if (wi::to_wide (@2) == 0)
6593 (if (TREE_CODE (@1) == INTEGER_CST)
6596 wi::overflow_type ovf;
6597 wide_int prod = wi::mul (wi::to_wide (@2), wi::to_wide (@1),
6598 TYPE_SIGN (TREE_TYPE (@1)), &ovf);
6601 { constant_boolean_node (cmp == NE_EXPR, type); }
6602 (cmp @0 { wide_int_to_tree (TREE_TYPE (@0), prod); }))))))))
6603 (for cmp (lt le gt ge)
6605 (cmp (exact_div @0 INTEGER_CST@1) INTEGER_CST@2)
6606 (if (wi::gt_p (wi::to_wide (@1), 0, TYPE_SIGN (TREE_TYPE (@1))))
6609 wi::overflow_type ovf;
6610 wide_int prod = wi::mul (wi::to_wide (@2), wi::to_wide (@1),
6611 TYPE_SIGN (TREE_TYPE (@1)), &ovf);
6614 { constant_boolean_node (wi::lt_p (wi::to_wide (@2), 0,
6615 TYPE_SIGN (TREE_TYPE (@2)))
6616 != (cmp == LT_EXPR || cmp == LE_EXPR), type); }
6617 (cmp @0 { wide_int_to_tree (TREE_TYPE (@0), prod); }))))))
6619 /* Fold (size_t)(A /[ex] B) CMP C to (size_t)A CMP (size_t)B * C or A CMP' 0.
6621 For small C (less than max/B), this is (size_t)A CMP (size_t)B * C.
6622 For large C (more than min/B+2^size), this is also true, with the
6623 multiplication computed modulo 2^size.
6624 For intermediate C, this just tests the sign of A. */
6625 (for cmp (lt le gt ge)
6628 (cmp (convert (exact_div @0 INTEGER_CST@1)) INTEGER_CST@2)
6629 (if (tree_nop_conversion_p (TREE_TYPE (@0), TREE_TYPE (@2))
6630 && TYPE_UNSIGNED (TREE_TYPE (@2)) && !TYPE_UNSIGNED (TREE_TYPE (@0))
6631 && wi::gt_p (wi::to_wide (@1), 0, TYPE_SIGN (TREE_TYPE (@1))))
6634 tree utype = TREE_TYPE (@2);
6635 wide_int denom = wi::to_wide (@1);
6636 wide_int right = wi::to_wide (@2);
6637 wide_int smax = wi::sdiv_trunc (wi::max_value (TREE_TYPE (@0)), denom);
6638 wide_int smin = wi::sdiv_trunc (wi::min_value (TREE_TYPE (@0)), denom);
6639 bool small = wi::leu_p (right, smax);
6640 bool large = wi::geu_p (right, smin);
6642 (if (small || large)
6643 (cmp (convert:utype @0) (mult @2 (convert @1)))
6644 (cmp2 @0 { build_zero_cst (TREE_TYPE (@0)); }))))))
6646 /* Unordered tests if either argument is a NaN. */
6648 (bit_ior (unordered @0 @0) (unordered @1 @1))
6649 (if (types_match (@0, @1))
6652 (bit_and (ordered @0 @0) (ordered @1 @1))
6653 (if (types_match (@0, @1))
6656 (bit_ior:c (unordered @0 @0) (unordered:c@2 @0 @1))
6659 (bit_and:c (ordered @0 @0) (ordered:c@2 @0 @1))
6662 /* A & (2**N - 1) <= 2**K - 1 -> A & (2**N - 2**K) == 0
6663 A & (2**N - 1) > 2**K - 1 -> A & (2**N - 2**K) != 0
6665 Note that comparisons
6666 A & (2**N - 1) < 2**K -> A & (2**N - 2**K) == 0
6667 A & (2**N - 1) >= 2**K -> A & (2**N - 2**K) != 0
6668 will be canonicalized to above so there's no need to
6675 (cmp (bit_and@0 @1 INTEGER_CST@2) INTEGER_CST@3)
6676 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0)))
6679 tree ty = TREE_TYPE (@0);
6680 unsigned prec = TYPE_PRECISION (ty);
6681 wide_int mask = wi::to_wide (@2, prec);
6682 wide_int rhs = wi::to_wide (@3, prec);
6683 signop sgn = TYPE_SIGN (ty);
6685 (if ((mask & (mask + 1)) == 0 && wi::gt_p (rhs, 0, sgn)
6686 && (rhs & (rhs + 1)) == 0 && wi::ge_p (mask, rhs, sgn))
6687 (eqcmp (bit_and @1 { wide_int_to_tree (ty, mask - rhs); })
6688 { build_zero_cst (ty); }))))))
6690 /* -A CMP -B -> B CMP A. */
6691 (for cmp (tcc_comparison)
6692 scmp (swapped_tcc_comparison)
6694 (cmp (negate @0) (negate @1))
6695 (if (FLOAT_TYPE_P (TREE_TYPE (@0))
6696 || (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
6699 || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))))
6702 (cmp (negate @0) CONSTANT_CLASS_P@1)
6703 (if (FLOAT_TYPE_P (TREE_TYPE (@0))
6704 || (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
6707 || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))))
6708 (with { tree tem = const_unop (NEGATE_EXPR, TREE_TYPE (@0), @1); }
6709 (if (tem && !TREE_OVERFLOW (tem))
6710 (scmp @0 { tem; }))))))
6712 /* Convert ABS[U]_EXPR<x> == 0 or ABS[U]_EXPR<x> != 0 to x == 0 or x != 0. */
6716 (eqne (op @0) zerop@1)
6717 (eqne @0 { build_zero_cst (TREE_TYPE (@0)); }))))
6719 /* From fold_sign_changed_comparison and fold_widened_comparison.
6720 FIXME: the lack of symmetry is disturbing. */
6721 (for cmp (simple_comparison)
6723 (cmp (convert@0 @00) (convert?@1 @10))
6724 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
6725 /* Disable this optimization if we're casting a function pointer
6726 type on targets that require function pointer canonicalization. */
6727 && !(targetm.have_canonicalize_funcptr_for_compare ()
6728 && ((POINTER_TYPE_P (TREE_TYPE (@00))
6729 && FUNC_OR_METHOD_TYPE_P (TREE_TYPE (TREE_TYPE (@00))))
6730 || (POINTER_TYPE_P (TREE_TYPE (@10))
6731 && FUNC_OR_METHOD_TYPE_P (TREE_TYPE (TREE_TYPE (@10))))))
6733 (if (TYPE_PRECISION (TREE_TYPE (@00)) == TYPE_PRECISION (TREE_TYPE (@0))
6734 && (TREE_CODE (@10) == INTEGER_CST
6736 && (TYPE_UNSIGNED (TREE_TYPE (@00)) == TYPE_UNSIGNED (TREE_TYPE (@0))
6739 && !POINTER_TYPE_P (TREE_TYPE (@00))
6740 /* (int)bool:32 != (int)uint is not the same as
6741 bool:32 != (bool:32)uint since boolean types only have two valid
6742 values independent of their precision. */
6743 && (TREE_CODE (TREE_TYPE (@00)) != BOOLEAN_TYPE
6744 || TREE_CODE (TREE_TYPE (@10)) == BOOLEAN_TYPE))
6745 /* ??? The special-casing of INTEGER_CST conversion was in the original
6746 code and here to avoid a spurious overflow flag on the resulting
6747 constant which fold_convert produces. */
6748 (if (TREE_CODE (@1) == INTEGER_CST)
6749 (cmp @00 { force_fit_type (TREE_TYPE (@00),
6750 wide_int::from (wi::to_wide (@1),
6751 MAX (TYPE_PRECISION (TREE_TYPE (@1)),
6752 TYPE_PRECISION (TREE_TYPE (@00))),
6753 TYPE_SIGN (TREE_TYPE (@1))),
6754 0, TREE_OVERFLOW (@1)); })
6755 (cmp @00 (convert @1)))
6757 (if (TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (TREE_TYPE (@00)))
6758 /* If possible, express the comparison in the shorter mode. */
6759 (if ((cmp == EQ_EXPR || cmp == NE_EXPR
6760 || TYPE_UNSIGNED (TREE_TYPE (@0)) == TYPE_UNSIGNED (TREE_TYPE (@00))
6761 || (!TYPE_UNSIGNED (TREE_TYPE (@0))
6762 && TYPE_UNSIGNED (TREE_TYPE (@00))))
6763 && (types_match (TREE_TYPE (@10), TREE_TYPE (@00))
6764 || ((TYPE_PRECISION (TREE_TYPE (@00))
6765 >= TYPE_PRECISION (TREE_TYPE (@10)))
6766 && (TYPE_UNSIGNED (TREE_TYPE (@00))
6767 == TYPE_UNSIGNED (TREE_TYPE (@10))))
6768 || (TREE_CODE (@1) == INTEGER_CST
6769 && INTEGRAL_TYPE_P (TREE_TYPE (@00))
6770 && int_fits_type_p (@1, TREE_TYPE (@00)))))
6771 (cmp @00 (convert @10))
6772 (if (TREE_CODE (@1) == INTEGER_CST
6773 && INTEGRAL_TYPE_P (TREE_TYPE (@00))
6774 && !int_fits_type_p (@1, TREE_TYPE (@00)))
6777 tree min = lower_bound_in_type (TREE_TYPE (@10), TREE_TYPE (@00));
6778 tree max = upper_bound_in_type (TREE_TYPE (@10), TREE_TYPE (@00));
6779 bool above = integer_nonzerop (const_binop (LT_EXPR, type, max, @1));
6780 bool below = integer_nonzerop (const_binop (LT_EXPR, type, @1, min));
6782 (if (above || below)
6783 (if (cmp == EQ_EXPR || cmp == NE_EXPR)
6784 { constant_boolean_node (cmp == EQ_EXPR ? false : true, type); }
6785 (if (cmp == LT_EXPR || cmp == LE_EXPR)
6786 { constant_boolean_node (above ? true : false, type); }
6787 (if (cmp == GT_EXPR || cmp == GE_EXPR)
6788 { constant_boolean_node (above ? false : true, type); })))))))))
6789 /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
6790 (if (FLOAT_TYPE_P (TREE_TYPE (@00))
6791 && (DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@0))
6792 == DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@00)))
6793 && (DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@0))
6794 == DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@10))))
6797 tree type1 = TREE_TYPE (@10);
6798 if (TREE_CODE (@10) == REAL_CST && !DECIMAL_FLOAT_TYPE_P (type1))
6800 REAL_VALUE_TYPE orig = TREE_REAL_CST (@10);
6801 if (TYPE_PRECISION (type1) > TYPE_PRECISION (float_type_node)
6802 && exact_real_truncate (TYPE_MODE (float_type_node), &orig))
6803 type1 = float_type_node;
6804 if (TYPE_PRECISION (type1) > TYPE_PRECISION (double_type_node)
6805 && exact_real_truncate (TYPE_MODE (double_type_node), &orig))
6806 type1 = double_type_node;
6809 = (element_precision (TREE_TYPE (@00)) > element_precision (type1)
6810 ? TREE_TYPE (@00) : type1);
6812 (if (element_precision (TREE_TYPE (@0)) > element_precision (newtype)
6813 && (!VECTOR_TYPE_P (type) || is_truth_type_for (newtype, type)))
6814 (cmp (convert:newtype @00) (convert:newtype @10))))))))
6819 /* SSA names are canonicalized to 2nd place. */
6820 (cmp addr@0 SSA_NAME@1)
6823 poly_int64 off; tree base;
6824 tree addr = (TREE_CODE (@0) == SSA_NAME
6825 ? gimple_assign_rhs1 (SSA_NAME_DEF_STMT (@0)) : @0);
6827 /* A local variable can never be pointed to by
6828 the default SSA name of an incoming parameter. */
6829 (if (SSA_NAME_IS_DEFAULT_DEF (@1)
6830 && TREE_CODE (SSA_NAME_VAR (@1)) == PARM_DECL
6831 && (base = get_base_address (TREE_OPERAND (addr, 0)))
6832 && TREE_CODE (base) == VAR_DECL
6833 && auto_var_in_fn_p (base, current_function_decl))
6834 (if (cmp == NE_EXPR)
6835 { constant_boolean_node (true, type); }
6836 { constant_boolean_node (false, type); })
6837 /* If the address is based on @1 decide using the offset. */
6838 (if ((base = get_addr_base_and_unit_offset (TREE_OPERAND (addr, 0), &off))
6839 && TREE_CODE (base) == MEM_REF
6840 && TREE_OPERAND (base, 0) == @1)
6841 (with { off += mem_ref_offset (base).force_shwi (); }
6842 (if (known_ne (off, 0))
6843 { constant_boolean_node (cmp == NE_EXPR, type); }
6844 (if (known_eq (off, 0))
6845 { constant_boolean_node (cmp == EQ_EXPR, type); }))))))))
6847 /* Equality compare simplifications from fold_binary */
6850 /* If we have (A | C) == D where C & ~D != 0, convert this into 0.
6851 Similarly for NE_EXPR. */
6853 (cmp (convert?@3 (bit_ior @0 INTEGER_CST@1)) INTEGER_CST@2)
6854 (if (tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@0))
6855 && wi::bit_and_not (wi::to_wide (@1), wi::to_wide (@2)) != 0)
6856 { constant_boolean_node (cmp == NE_EXPR, type); }))
6858 /* (X ^ Y) == 0 becomes X == Y, and (X ^ Y) != 0 becomes X != Y. */
6860 (cmp (bit_xor @0 @1) integer_zerop)
6863 /* (X ^ Y) == Y becomes X == 0.
6864 Likewise (X ^ Y) == X becomes Y == 0. */
6866 (cmp:c (bit_xor:c @0 @1) @0)
6867 (cmp @1 { build_zero_cst (TREE_TYPE (@1)); }))
6869 /* (X & Y) == X becomes (X & ~Y) == 0. */
6871 (cmp:c (bit_and:c @0 @1) @0)
6872 (cmp (bit_and @0 (bit_not! @1)) { build_zero_cst (TREE_TYPE (@0)); }))
6874 (cmp:c (convert@3 (bit_and (convert@2 @0) INTEGER_CST@1)) (convert @0))
6875 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
6876 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
6877 && INTEGRAL_TYPE_P (TREE_TYPE (@3))
6878 && TYPE_PRECISION (TREE_TYPE (@2)) == TYPE_PRECISION (TREE_TYPE (@0))
6879 && TYPE_PRECISION (TREE_TYPE (@3)) > TYPE_PRECISION (TREE_TYPE (@2))
6880 && !wi::neg_p (wi::to_wide (@1)))
6881 (cmp (bit_and @0 (convert (bit_not @1)))
6882 { build_zero_cst (TREE_TYPE (@0)); })))
6884 /* (X | Y) == Y becomes (X & ~Y) == 0. */
6886 (cmp:c (bit_ior:c @0 @1) @1)
6887 (cmp (bit_and @0 (bit_not! @1)) { build_zero_cst (TREE_TYPE (@0)); }))
6889 /* (X ^ C1) op C2 can be rewritten as X op (C1 ^ C2). */
6891 (cmp (convert?@3 (bit_xor @0 INTEGER_CST@1)) INTEGER_CST@2)
6892 (if (tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@0)))
6893 (cmp @0 (bit_xor @1 (convert @2)))))
6896 (cmp (nop_convert? @0) integer_zerop)
6897 (if (tree_expr_nonzero_p (@0))
6898 { constant_boolean_node (cmp == NE_EXPR, type); }))
6900 /* (X & C) op (Y & C) into (X ^ Y) & C op 0. */
6902 (cmp (bit_and:cs @0 @2) (bit_and:cs @1 @2))
6903 (cmp (bit_and (bit_xor @0 @1) @2) { build_zero_cst (TREE_TYPE (@2)); })))
6905 /* (X < 0) != (Y < 0) into (X ^ Y) < 0.
6906 (X >= 0) != (Y >= 0) into (X ^ Y) < 0.
6907 (X < 0) == (Y < 0) into (X ^ Y) >= 0.
6908 (X >= 0) == (Y >= 0) into (X ^ Y) >= 0. */
6913 (cmp (sgncmp @0 integer_zerop@2) (sgncmp @1 integer_zerop))
6914 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
6915 && !TYPE_UNSIGNED (TREE_TYPE (@0))
6916 && types_match (@0, @1))
6917 (ncmp (bit_xor @0 @1) @2)))))
6918 /* (X < 0) == (Y >= 0) into (X ^ Y) < 0.
6919 (X < 0) != (Y >= 0) into (X ^ Y) >= 0. */
6923 (cmp:c (lt @0 integer_zerop@2) (ge @1 integer_zerop))
6924 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
6925 && !TYPE_UNSIGNED (TREE_TYPE (@0))
6926 && types_match (@0, @1))
6927 (ncmp (bit_xor @0 @1) @2))))
6929 /* If we have (A & C) == C where C is a power of 2, convert this into
6930 (A & C) != 0. Similarly for NE_EXPR. */
6934 (cmp (bit_and@2 @0 integer_pow2p@1) @1)
6935 (icmp @2 { build_zero_cst (TREE_TYPE (@0)); })))
6938 /* From fold_binary_op_with_conditional_arg handle the case of
6939 rewriting (a ? b : c) > d to a ? (b > d) : (c > d) when the
6940 compares simplify. */
6941 (for cmp (simple_comparison)
6943 (cmp:c (cond @0 @1 @2) @3)
6944 /* Do not move possibly trapping operations into the conditional as this
6945 pessimizes code and causes gimplification issues when applied late. */
6946 (if (!FLOAT_TYPE_P (TREE_TYPE (@3))
6947 || !operation_could_trap_p (cmp, true, false, @3))
6948 (cond @0 (cmp! @1 @3) (cmp! @2 @3)))))
6952 /* x < 0 ? ~y : y into (x >> (prec-1)) ^ y. */
6953 /* x >= 0 ? ~y : y into ~((x >> (prec-1)) ^ y). */
6955 (cond (cmp @0 integer_zerop) (bit_not @1) @1)
6956 (if (INTEGRAL_TYPE_P (type)
6957 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
6958 && !TYPE_UNSIGNED (TREE_TYPE (@0))
6959 && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (type))
6962 tree shifter = build_int_cst (integer_type_node, TYPE_PRECISION (type) - 1);
6964 (if (cmp == LT_EXPR)
6965 (bit_xor (convert (rshift @0 {shifter;})) @1)
6966 (bit_not (bit_xor (convert (rshift @0 {shifter;})) @1))))))
6967 /* x < 0 ? y : ~y into ~((x >> (prec-1)) ^ y). */
6968 /* x >= 0 ? y : ~y into (x >> (prec-1)) ^ y. */
6970 (cond (cmp @0 integer_zerop) @1 (bit_not @1))
6971 (if (INTEGRAL_TYPE_P (type)
6972 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
6973 && !TYPE_UNSIGNED (TREE_TYPE (@0))
6974 && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (type))
6977 tree shifter = build_int_cst (integer_type_node, TYPE_PRECISION (type) - 1);
6979 (if (cmp == GE_EXPR)
6980 (bit_xor (convert (rshift @0 {shifter;})) @1)
6981 (bit_not (bit_xor (convert (rshift @0 {shifter;})) @1)))))))
6983 /* If we have (A & C) != 0 ? D : 0 where C and D are powers of 2,
6984 convert this into a shift followed by ANDing with D. */
6987 (ne (bit_and @0 integer_pow2p@1) integer_zerop)
6988 INTEGER_CST@2 integer_zerop)
6989 (if (!POINTER_TYPE_P (type) && integer_pow2p (@2))
6991 int shift = (wi::exact_log2 (wi::to_wide (@2))
6992 - wi::exact_log2 (wi::to_wide (@1)));
6996 (lshift (convert @0) { build_int_cst (integer_type_node, shift); }) @2)
6998 (convert (rshift @0 { build_int_cst (integer_type_node, -shift); }))
7001 /* If we have (A & C) != 0 where C is the sign bit of A, convert
7002 this into A < 0. Similarly for (A & C) == 0 into A >= 0. */
7006 (cmp (bit_and (convert?@2 @0) integer_pow2p@1) integer_zerop)
7007 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
7008 && type_has_mode_precision_p (TREE_TYPE (@0))
7009 && element_precision (@2) >= element_precision (@0)
7010 && wi::only_sign_bit_p (wi::to_wide (@1), element_precision (@0)))
7011 (with { tree stype = signed_type_for (TREE_TYPE (@0)); }
7012 (ncmp (convert:stype @0) { build_zero_cst (stype); })))))
7014 /* If we have A < 0 ? C : 0 where C is a power of 2, convert
7015 this into a right shift or sign extension followed by ANDing with C. */
7018 (lt @0 integer_zerop)
7019 INTEGER_CST@1 integer_zerop)
7020 (if (integer_pow2p (@1)
7021 && !TYPE_UNSIGNED (TREE_TYPE (@0)))
7023 int shift = element_precision (@0) - wi::exact_log2 (wi::to_wide (@1)) - 1;
7027 (convert (rshift @0 { build_int_cst (integer_type_node, shift); }))
7029 /* Otherwise ctype must be wider than TREE_TYPE (@0) and pure
7030 sign extension followed by AND with C will achieve the effect. */
7031 (bit_and (convert @0) @1)))))
7033 /* When the addresses are not directly of decls compare base and offset.
7034 This implements some remaining parts of fold_comparison address
7035 comparisons but still no complete part of it. Still it is good
7036 enough to make fold_stmt not regress when not dispatching to fold_binary. */
7037 (for cmp (simple_comparison)
7039 (cmp (convert1?@2 addr@0) (convert2? addr@1))
7042 poly_int64 off0, off1;
7044 int equal = address_compare (cmp, TREE_TYPE (@2), @0, @1, base0, base1,
7045 off0, off1, GENERIC);
7049 (if (cmp == EQ_EXPR && (known_eq (off0, off1) || known_ne (off0, off1)))
7050 { constant_boolean_node (known_eq (off0, off1), type); })
7051 (if (cmp == NE_EXPR && (known_eq (off0, off1) || known_ne (off0, off1)))
7052 { constant_boolean_node (known_ne (off0, off1), type); })
7053 (if (cmp == LT_EXPR && (known_lt (off0, off1) || known_ge (off0, off1)))
7054 { constant_boolean_node (known_lt (off0, off1), type); })
7055 (if (cmp == LE_EXPR && (known_le (off0, off1) || known_gt (off0, off1)))
7056 { constant_boolean_node (known_le (off0, off1), type); })
7057 (if (cmp == GE_EXPR && (known_ge (off0, off1) || known_lt (off0, off1)))
7058 { constant_boolean_node (known_ge (off0, off1), type); })
7059 (if (cmp == GT_EXPR && (known_gt (off0, off1) || known_le (off0, off1)))
7060 { constant_boolean_node (known_gt (off0, off1), type); }))
7063 (if (cmp == EQ_EXPR)
7064 { constant_boolean_node (false, type); })
7065 (if (cmp == NE_EXPR)
7066 { constant_boolean_node (true, type); })))))))
7069 /* a?~t:t -> (-(a))^t */
7072 (with { bool wascmp; }
7073 (if (INTEGRAL_TYPE_P (type)
7074 && bitwise_inverted_equal_p (@1, @2, wascmp)
7075 && (!wascmp || TYPE_PRECISION (type) == 1))
7076 (if ((!TYPE_UNSIGNED (type) && TREE_CODE (type) == BOOLEAN_TYPE)
7077 || TYPE_PRECISION (type) == 1)
7078 (bit_xor (convert:type @0) @2)
7079 (bit_xor (negate (convert:type @0)) @2)))))
7082 /* Simplify pointer equality compares using PTA. */
7086 (if (POINTER_TYPE_P (TREE_TYPE (@0))
7087 && ptrs_compare_unequal (@0, @1))
7088 { constant_boolean_node (neeq != EQ_EXPR, type); })))
7090 /* PR70920: Transform (intptr_t)x eq/ne CST to x eq/ne (typeof x) CST.
7091 and (typeof ptr_cst) x eq/ne ptr_cst to x eq/ne (typeof x) CST.
7092 Disable the transform if either operand is pointer to function.
7093 This broke pr22051-2.c for arm where function pointer
7094 canonicalizaion is not wanted. */
7098 (cmp (convert @0) INTEGER_CST@1)
7099 (if (((POINTER_TYPE_P (TREE_TYPE (@0))
7100 && !FUNC_OR_METHOD_TYPE_P (TREE_TYPE (TREE_TYPE (@0)))
7101 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
7102 /* Don't perform this optimization in GENERIC if @0 has reference
7103 type when sanitizing. See PR101210. */
7105 && TREE_CODE (TREE_TYPE (@0)) == REFERENCE_TYPE
7106 && (flag_sanitize & (SANITIZE_NULL | SANITIZE_ALIGNMENT))))
7107 || (INTEGRAL_TYPE_P (TREE_TYPE (@0))
7108 && POINTER_TYPE_P (TREE_TYPE (@1))
7109 && !FUNC_OR_METHOD_TYPE_P (TREE_TYPE (TREE_TYPE (@1)))))
7110 && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
7111 (cmp @0 (convert @1)))))
7113 /* Non-equality compare simplifications from fold_binary */
7114 (for cmp (lt gt le ge)
7115 /* Comparisons with the highest or lowest possible integer of
7116 the specified precision will have known values. */
7118 (cmp (convert?@2 @0) uniform_integer_cst_p@1)
7119 (if ((INTEGRAL_TYPE_P (TREE_TYPE (@1))
7120 || POINTER_TYPE_P (TREE_TYPE (@1))
7121 || VECTOR_INTEGER_TYPE_P (TREE_TYPE (@1)))
7122 && tree_nop_conversion_p (TREE_TYPE (@2), TREE_TYPE (@0)))
7125 tree cst = uniform_integer_cst_p (@1);
7126 tree arg1_type = TREE_TYPE (cst);
7127 unsigned int prec = TYPE_PRECISION (arg1_type);
7128 wide_int max = wi::max_value (arg1_type);
7129 wide_int signed_max = wi::max_value (prec, SIGNED);
7130 wide_int min = wi::min_value (arg1_type);
7133 (if (wi::to_wide (cst) == max)
7135 (if (cmp == GT_EXPR)
7136 { constant_boolean_node (false, type); })
7137 (if (cmp == GE_EXPR)
7139 (if (cmp == LE_EXPR)
7140 { constant_boolean_node (true, type); })
7141 (if (cmp == LT_EXPR)
7143 (if (wi::to_wide (cst) == min)
7145 (if (cmp == LT_EXPR)
7146 { constant_boolean_node (false, type); })
7147 (if (cmp == LE_EXPR)
7149 (if (cmp == GE_EXPR)
7150 { constant_boolean_node (true, type); })
7151 (if (cmp == GT_EXPR)
7153 (if (wi::to_wide (cst) == max - 1)
7155 (if (cmp == GT_EXPR)
7156 (eq @2 { build_uniform_cst (TREE_TYPE (@1),
7157 wide_int_to_tree (TREE_TYPE (cst),
7160 (if (cmp == LE_EXPR)
7161 (ne @2 { build_uniform_cst (TREE_TYPE (@1),
7162 wide_int_to_tree (TREE_TYPE (cst),
7165 (if (wi::to_wide (cst) == min + 1)
7167 (if (cmp == GE_EXPR)
7168 (ne @2 { build_uniform_cst (TREE_TYPE (@1),
7169 wide_int_to_tree (TREE_TYPE (cst),
7172 (if (cmp == LT_EXPR)
7173 (eq @2 { build_uniform_cst (TREE_TYPE (@1),
7174 wide_int_to_tree (TREE_TYPE (cst),
7177 (if (wi::to_wide (cst) == signed_max
7178 && TYPE_UNSIGNED (arg1_type)
7179 && TYPE_MODE (arg1_type) != BLKmode
7180 /* We will flip the signedness of the comparison operator
7181 associated with the mode of @1, so the sign bit is
7182 specified by this mode. Check that @1 is the signed
7183 max associated with this sign bit. */
7184 && prec == GET_MODE_PRECISION (SCALAR_INT_TYPE_MODE (arg1_type))
7185 /* signed_type does not work on pointer types. */
7186 && INTEGRAL_TYPE_P (arg1_type))
7187 /* The following case also applies to X < signed_max+1
7188 and X >= signed_max+1 because previous transformations. */
7189 (if (cmp == LE_EXPR || cmp == GT_EXPR)
7190 (with { tree st = signed_type_for (TREE_TYPE (@1)); }
7192 (if (cst == @1 && cmp == LE_EXPR)
7193 (ge (convert:st @0) { build_zero_cst (st); }))
7194 (if (cst == @1 && cmp == GT_EXPR)
7195 (lt (convert:st @0) { build_zero_cst (st); }))
7196 (if (cmp == LE_EXPR)
7197 (ge (view_convert:st @0) { build_zero_cst (st); }))
7198 (if (cmp == GT_EXPR)
7199 (lt (view_convert:st @0) { build_zero_cst (st); })))))))))))
7201 /* unsigned < (typeof unsigned)(unsigned != 0) is always false. */
7203 (lt:c @0 (convert (ne @0 integer_zerop)))
7204 (if (TYPE_UNSIGNED (TREE_TYPE (@0)))
7205 { constant_boolean_node (false, type); }))
7207 /* x != (typeof x)(x == CST) -> CST == 0 ? 1 : (CST == 1 ? (x!=0&&x!=1) : x != 0) */
7208 /* x != (typeof x)(x != CST) -> CST == 1 ? 1 : (CST == 0 ? (x!=0&&x!=1) : x != 1) */
7209 /* x == (typeof x)(x == CST) -> CST == 0 ? 0 : (CST == 1 ? (x==0||x==1) : x == 0) */
7210 /* x == (typeof x)(x != CST) -> CST == 1 ? 0 : (CST == 0 ? (x==0||x==1) : x == 1) */
7214 (outer:c @0 (convert (inner @0 INTEGER_CST@1)))
7216 bool cst1 = integer_onep (@1);
7217 bool cst0 = integer_zerop (@1);
7218 bool innereq = inner == EQ_EXPR;
7219 bool outereq = outer == EQ_EXPR;
7222 (if (innereq ? cst0 : cst1)
7223 { constant_boolean_node (!outereq, type); })
7224 (if (innereq ? cst1 : cst0)
7226 tree utype = unsigned_type_for (TREE_TYPE (@0));
7227 tree ucst1 = build_one_cst (utype);
7230 (gt (convert:utype @0) { ucst1; })
7231 (le (convert:utype @0) { ucst1; })
7236 tree value = build_int_cst (TREE_TYPE (@0), !innereq);
7249 (for cmp (unordered ordered unlt unle ungt unge uneq ltgt)
7250 /* If the second operand is NaN, the result is constant. */
7253 (if (REAL_VALUE_ISNAN (TREE_REAL_CST (@1))
7254 && (cmp != LTGT_EXPR || ! flag_trapping_math))
7255 { constant_boolean_node (cmp == ORDERED_EXPR || cmp == LTGT_EXPR
7256 ? false : true, type); })))
7258 /* Fold UNORDERED if either operand must be NaN, or neither can be. */
7262 (if (tree_expr_nan_p (@0) || tree_expr_nan_p (@1))
7263 { constant_boolean_node (true, type); })
7264 (if (!tree_expr_maybe_nan_p (@0) && !tree_expr_maybe_nan_p (@1))
7265 { constant_boolean_node (false, type); })))
7267 /* Fold ORDERED if either operand must be NaN, or neither can be. */
7271 (if (tree_expr_nan_p (@0) || tree_expr_nan_p (@1))
7272 { constant_boolean_node (false, type); })
7273 (if (!tree_expr_maybe_nan_p (@0) && !tree_expr_maybe_nan_p (@1))
7274 { constant_boolean_node (true, type); })))
7276 /* bool_var != 0 becomes bool_var. */
7278 (ne @0 integer_zerop)
7279 (if (TREE_CODE (TREE_TYPE (@0)) == BOOLEAN_TYPE
7280 && types_match (type, TREE_TYPE (@0)))
7282 /* bool_var == 1 becomes bool_var. */
7284 (eq @0 integer_onep)
7285 (if (TREE_CODE (TREE_TYPE (@0)) == BOOLEAN_TYPE
7286 && types_match (type, TREE_TYPE (@0)))
7289 bool_var == 0 becomes !bool_var or
7290 bool_var != 1 becomes !bool_var
7291 here because that only is good in assignment context as long
7292 as we require a tcc_comparison in GIMPLE_CONDs where we'd
7293 replace if (x == 0) with tem = ~x; if (tem != 0) which is
7294 clearly less optimal and which we'll transform again in forwprop. */
7296 /* Transform comparisons of the form (X & Y) CMP 0 to X CMP2 Z
7297 where ~Y + 1 == pow2 and Z = ~Y. */
7298 (for cst (VECTOR_CST INTEGER_CST)
7302 (cmp (bit_and:c@2 @0 cst@1) integer_zerop)
7303 (with { tree csts = bitmask_inv_cst_vector_p (@1); }
7304 (if (csts && (VECTOR_TYPE_P (TREE_TYPE (@1)) || single_use (@2)))
7305 (with { auto optab = VECTOR_TYPE_P (TREE_TYPE (@1))
7306 ? optab_vector : optab_default;
7307 tree utype = unsigned_type_for (TREE_TYPE (@1)); }
7308 (if (target_supports_op_p (utype, icmp, optab)
7309 || (optimize_vectors_before_lowering_p ()
7310 && (!target_supports_op_p (type, cmp, optab)
7311 || !target_supports_op_p (type, BIT_AND_EXPR, optab))))
7312 (if (TYPE_UNSIGNED (TREE_TYPE (@1)))
7314 (icmp (view_convert:utype @0) { csts; })))))))))
7316 /* When one argument is a constant, overflow detection can be simplified.
7317 Currently restricted to single use so as not to interfere too much with
7318 ADD_OVERFLOW detection in tree-ssa-math-opts.cc.
7319 CONVERT?(CONVERT?(A) + CST) CMP A -> A CMP' CST' */
7320 (for cmp (lt le ge gt)
7323 (cmp:c (convert?@3 (plus@2 (convert?@4 @0) INTEGER_CST@1)) @0)
7324 (if (TYPE_OVERFLOW_WRAPS (TREE_TYPE (@2))
7325 && types_match (TREE_TYPE (@0), TREE_TYPE (@3))
7326 && tree_nop_conversion_p (TREE_TYPE (@4), TREE_TYPE (@0))
7327 && wi::to_wide (@1) != 0
7330 unsigned int prec = TYPE_PRECISION (TREE_TYPE (@0));
7331 signop sign = TYPE_SIGN (TREE_TYPE (@0));
7333 (out @0 { wide_int_to_tree (TREE_TYPE (@0),
7334 wi::max_value (prec, sign)
7335 - wi::to_wide (@1)); })))))
7337 /* To detect overflow in unsigned A - B, A < B is simpler than A - B > A.
7338 However, the detection logic for SUB_OVERFLOW in tree-ssa-math-opts.cc
7339 expects the long form, so we restrict the transformation for now. */
7342 (cmp:c (minus@2 @0 @1) @0)
7343 (if (single_use (@2)
7344 && ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
7345 && TYPE_UNSIGNED (TREE_TYPE (@0)))
7348 /* Optimize A - B + -1 >= A into B >= A for unsigned comparisons. */
7351 (cmp:c (plus (minus @0 @1) integer_minus_onep) @0)
7352 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
7353 && TYPE_UNSIGNED (TREE_TYPE (@0)))
7356 /* Testing for overflow is unnecessary if we already know the result. */
7361 (cmp:c (realpart (IFN_SUB_OVERFLOW@2 @0 @1)) @0)
7362 (if (TYPE_UNSIGNED (TREE_TYPE (@0))
7363 && types_match (TREE_TYPE (@0), TREE_TYPE (@1)))
7364 (out (imagpart @2) { build_zero_cst (TREE_TYPE (@0)); }))))
7369 (cmp:c (realpart (IFN_ADD_OVERFLOW:c@2 @0 @1)) @0)
7370 (if (TYPE_UNSIGNED (TREE_TYPE (@0))
7371 && types_match (TREE_TYPE (@0), TREE_TYPE (@1)))
7372 (out (imagpart @2) { build_zero_cst (TREE_TYPE (@0)); }))))
7374 /* For unsigned operands, -1 / B < A checks whether A * B would overflow.
7375 Simplify it to __builtin_mul_overflow (A, B, <unused>). */
7379 (cmp:c (trunc_div:s integer_all_onesp @1) @0)
7380 (if (TYPE_UNSIGNED (TREE_TYPE (@0)) && !VECTOR_TYPE_P (TREE_TYPE (@0)))
7381 (with { tree t = TREE_TYPE (@0), cpx = build_complex_type (t); }
7382 (out (imagpart (IFN_MUL_OVERFLOW:cpx @0 @1)) { build_zero_cst (t); })))))
7384 /* Similarly, for unsigned operands, (((type) A * B) >> prec) != 0 where type
7385 is at least twice as wide as type of A and B, simplify to
7386 __builtin_mul_overflow (A, B, <unused>). */
7389 (cmp (rshift (mult:s (convert@3 @0) (convert @1)) INTEGER_CST@2)
7391 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
7392 && INTEGRAL_TYPE_P (TREE_TYPE (@3))
7393 && TYPE_UNSIGNED (TREE_TYPE (@0))
7394 && (TYPE_PRECISION (TREE_TYPE (@3))
7395 >= 2 * TYPE_PRECISION (TREE_TYPE (@0)))
7396 && tree_fits_uhwi_p (@2)
7397 && tree_to_uhwi (@2) == TYPE_PRECISION (TREE_TYPE (@0))
7398 && types_match (@0, @1)
7399 && type_has_mode_precision_p (TREE_TYPE (@0))
7400 && (optab_handler (umulv4_optab, TYPE_MODE (TREE_TYPE (@0)))
7401 != CODE_FOR_nothing))
7402 (with { tree t = TREE_TYPE (@0), cpx = build_complex_type (t); }
7403 (cmp (imagpart (IFN_MUL_OVERFLOW:cpx @0 @1)) { build_zero_cst (t); })))))
7405 /* Demote operands of IFN_{ADD,SUB,MUL}_OVERFLOW. */
7406 (for ovf (IFN_ADD_OVERFLOW IFN_SUB_OVERFLOW IFN_MUL_OVERFLOW)
7408 (ovf (convert@2 @0) @1)
7409 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
7410 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
7411 && TYPE_PRECISION (TREE_TYPE (@2)) > TYPE_PRECISION (TREE_TYPE (@0))
7412 && (!TYPE_UNSIGNED (TREE_TYPE (@2)) || TYPE_UNSIGNED (TREE_TYPE (@0))))
7415 (ovf @1 (convert@2 @0))
7416 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
7417 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
7418 && TYPE_PRECISION (TREE_TYPE (@2)) > TYPE_PRECISION (TREE_TYPE (@0))
7419 && (!TYPE_UNSIGNED (TREE_TYPE (@2)) || TYPE_UNSIGNED (TREE_TYPE (@0))))
7422 /* Optimize __builtin_mul_overflow_p (x, cst, (utype) 0) if all 3 types
7423 are unsigned to x > (umax / cst). Similarly for signed type, but
7424 in that case it needs to be outside of a range. */
7426 (imagpart (IFN_MUL_OVERFLOW:cs@2 @0 integer_nonzerop@1))
7427 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
7428 && TYPE_MAX_VALUE (TREE_TYPE (@0))
7429 && types_match (TREE_TYPE (@0), TREE_TYPE (TREE_TYPE (@2)))
7430 && int_fits_type_p (@1, TREE_TYPE (@0)))
7431 (if (TYPE_UNSIGNED (TREE_TYPE (@0)))
7432 (convert (gt @0 (trunc_div! { TYPE_MAX_VALUE (TREE_TYPE (@0)); } @1)))
7433 (if (TYPE_MIN_VALUE (TREE_TYPE (@0)))
7434 (if (integer_minus_onep (@1))
7435 (convert (eq @0 { TYPE_MIN_VALUE (TREE_TYPE (@0)); }))
7438 tree div = fold_convert (TREE_TYPE (@0), @1);
7439 tree lo = int_const_binop (TRUNC_DIV_EXPR,
7440 TYPE_MIN_VALUE (TREE_TYPE (@0)), div);
7441 tree hi = int_const_binop (TRUNC_DIV_EXPR,
7442 TYPE_MAX_VALUE (TREE_TYPE (@0)), div);
7443 tree etype = range_check_type (TREE_TYPE (@0));
7446 if (wi::neg_p (wi::to_wide (div)))
7448 lo = fold_convert (etype, lo);
7449 hi = fold_convert (etype, hi);
7450 hi = int_const_binop (MINUS_EXPR, hi, lo);
7454 (convert (gt (minus (convert:etype @0) { lo; }) { hi; })))))))))
7456 /* Simplification of math builtins. These rules must all be optimizations
7457 as well as IL simplifications. If there is a possibility that the new
7458 form could be a pessimization, the rule should go in the canonicalization
7459 section that follows this one.
7461 Rules can generally go in this section if they satisfy one of
7464 - the rule describes an identity
7466 - the rule replaces calls with something as simple as addition or
7469 - the rule contains unary calls only and simplifies the surrounding
7470 arithmetic. (The idea here is to exclude non-unary calls in which
7471 one operand is constant and in which the call is known to be cheap
7472 when the operand has that value.) */
7474 (if (flag_unsafe_math_optimizations)
7475 /* Simplify sqrt(x) * sqrt(x) -> x. */
7477 (mult (SQRT_ALL@1 @0) @1)
7478 (if (!tree_expr_maybe_signaling_nan_p (@0))
7481 (for op (plus minus)
7482 /* Simplify (A / C) +- (B / C) -> (A +- B) / C. */
7486 (rdiv (op @0 @2) @1)))
7488 (for cmp (lt le gt ge)
7489 neg_cmp (gt ge lt le)
7490 /* Simplify (x * C1) cmp C2 -> x cmp (C2 / C1), where C1 != 0. */
7492 (cmp (mult @0 REAL_CST@1) REAL_CST@2)
7494 { tree tem = const_binop (RDIV_EXPR, type, @2, @1); }
7496 && !(REAL_VALUE_ISINF (TREE_REAL_CST (tem))
7497 || (real_zerop (tem) && !real_zerop (@1))))
7499 (if (real_less (&dconst0, TREE_REAL_CST_PTR (@1)))
7501 (if (real_less (TREE_REAL_CST_PTR (@1), &dconst0))
7502 (neg_cmp @0 { tem; })))))))
7504 /* Simplify sqrt(x) * sqrt(y) -> sqrt(x*y). */
7505 (for root (SQRT CBRT)
7507 (mult (root:s @0) (root:s @1))
7508 (root (mult @0 @1))))
7510 /* Simplify expN(x) * expN(y) -> expN(x+y). */
7511 (for exps (EXP EXP2 EXP10 POW10)
7513 (mult (exps:s @0) (exps:s @1))
7514 (exps (plus @0 @1))))
7516 /* Simplify a/root(b/c) into a*root(c/b). */
7517 (for root (SQRT CBRT)
7519 (rdiv @0 (root:s (rdiv:s @1 @2)))
7520 (mult @0 (root (rdiv @2 @1)))))
7522 /* Simplify x/expN(y) into x*expN(-y). */
7523 (for exps (EXP EXP2 EXP10 POW10)
7525 (rdiv @0 (exps:s @1))
7526 (mult @0 (exps (negate @1)))))
7528 (for logs (LOG LOG2 LOG10 LOG10)
7529 exps (EXP EXP2 EXP10 POW10)
7530 /* logN(expN(x)) -> x. */
7534 /* expN(logN(x)) -> x. */
7539 /* Optimize logN(func()) for various exponential functions. We
7540 want to determine the value "x" and the power "exponent" in
7541 order to transform logN(x**exponent) into exponent*logN(x). */
7542 (for logs (LOG LOG LOG LOG2 LOG2 LOG2 LOG10 LOG10)
7543 exps (EXP2 EXP10 POW10 EXP EXP10 POW10 EXP EXP2)
7546 (if (SCALAR_FLOAT_TYPE_P (type))
7552 /* Prepare to do logN(exp(exponent)) -> exponent*logN(e). */
7553 x = build_real_truncate (type, dconst_e ());
7556 /* Prepare to do logN(exp2(exponent)) -> exponent*logN(2). */
7557 x = build_real (type, dconst2);
7561 /* Prepare to do logN(exp10(exponent)) -> exponent*logN(10). */
7563 REAL_VALUE_TYPE dconst10;
7564 real_from_integer (&dconst10, VOIDmode, 10, SIGNED);
7565 x = build_real (type, dconst10);
7572 (mult (logs { x; }) @0)))))
7580 (if (SCALAR_FLOAT_TYPE_P (type))
7586 /* Prepare to do logN(sqrt(x)) -> 0.5*logN(x). */
7587 x = build_real (type, dconsthalf);
7590 /* Prepare to do logN(cbrt(x)) -> (1/3)*logN(x). */
7591 x = build_real_truncate (type, dconst_third ());
7597 (mult { x; } (logs @0))))))
7599 /* logN(pow(x,exponent)) -> exponent*logN(x). */
7600 (for logs (LOG LOG2 LOG10)
7604 (mult @1 (logs @0))))
7606 /* pow(C,x) -> exp(log(C)*x) if C > 0,
7607 or if C is a positive power of 2,
7608 pow(C,x) -> exp2(log2(C)*x). */
7616 (pows REAL_CST@0 @1)
7617 (if (real_compare (GT_EXPR, TREE_REAL_CST_PTR (@0), &dconst0)
7618 && real_isfinite (TREE_REAL_CST_PTR (@0))
7619 /* As libmvec doesn't have a vectorized exp2, defer optimizing
7620 the use_exp2 case until after vectorization. It seems actually
7621 beneficial for all constants to postpone this until later,
7622 because exp(log(C)*x), while faster, will have worse precision
7623 and if x folds into a constant too, that is unnecessary
7625 && canonicalize_math_after_vectorization_p ())
7627 const REAL_VALUE_TYPE *const value = TREE_REAL_CST_PTR (@0);
7628 bool use_exp2 = false;
7629 if (targetm.libc_has_function (function_c99_misc, TREE_TYPE (@0))
7630 && value->cl == rvc_normal)
7632 REAL_VALUE_TYPE frac_rvt = *value;
7633 SET_REAL_EXP (&frac_rvt, 1);
7634 if (real_equal (&frac_rvt, &dconst1))
7639 (if (optimize_pow_to_exp (@0, @1))
7640 (exps (mult (logs @0) @1)))
7641 (exp2s (mult (log2s @0) @1)))))))
7644 /* pow(C,x)*expN(y) -> expN(logN(C)*x+y) if C > 0. */
7646 exps (EXP EXP2 EXP10 POW10)
7647 logs (LOG LOG2 LOG10 LOG10)
7649 (mult:c (pows:s REAL_CST@0 @1) (exps:s @2))
7650 (if (real_compare (GT_EXPR, TREE_REAL_CST_PTR (@0), &dconst0)
7651 && real_isfinite (TREE_REAL_CST_PTR (@0)))
7652 (exps (plus (mult (logs @0) @1) @2)))))
7657 exps (EXP EXP2 EXP10 POW10)
7658 /* sqrt(expN(x)) -> expN(x*0.5). */
7661 (exps (mult @0 { build_real (type, dconsthalf); })))
7662 /* cbrt(expN(x)) -> expN(x/3). */
7665 (exps (mult @0 { build_real_truncate (type, dconst_third ()); })))
7666 /* pow(expN(x), y) -> expN(x*y). */
7669 (exps (mult @0 @1))))
7671 /* tan(atan(x)) -> x. */
7678 /* Simplify sin(atan(x)) -> x / sqrt(x*x + 1). */
7682 copysigns (COPYSIGN)
7687 REAL_VALUE_TYPE r_cst;
7688 build_sinatan_real (&r_cst, type);
7689 tree t_cst = build_real (type, r_cst);
7690 tree t_one = build_one_cst (type);
7692 (if (SCALAR_FLOAT_TYPE_P (type))
7693 (cond (lt (abs @0) { t_cst; })
7694 (rdiv @0 (sqrts (plus (mult @0 @0) { t_one; })))
7695 (copysigns { t_one; } @0))))))
7697 /* Simplify cos(atan(x)) -> 1 / sqrt(x*x + 1). */
7701 copysigns (COPYSIGN)
7706 REAL_VALUE_TYPE r_cst;
7707 build_sinatan_real (&r_cst, type);
7708 tree t_cst = build_real (type, r_cst);
7709 tree t_one = build_one_cst (type);
7710 tree t_zero = build_zero_cst (type);
7712 (if (SCALAR_FLOAT_TYPE_P (type))
7713 (cond (lt (abs @0) { t_cst; })
7714 (rdiv { t_one; } (sqrts (plus (mult @0 @0) { t_one; })))
7715 (copysigns { t_zero; } @0))))))
7717 (if (!flag_errno_math)
7718 /* Simplify sinh(atanh(x)) -> x / sqrt((1 - x)*(1 + x)). */
7723 (sinhs (atanhs:s @0))
7724 (with { tree t_one = build_one_cst (type); }
7725 (rdiv @0 (sqrts (mult (minus { t_one; } @0) (plus { t_one; } @0)))))))
7727 /* Simplify cosh(atanh(x)) -> 1 / sqrt((1 - x)*(1 + x)) */
7732 (coshs (atanhs:s @0))
7733 (with { tree t_one = build_one_cst (type); }
7734 (rdiv { t_one; } (sqrts (mult (minus { t_one; } @0) (plus { t_one; } @0))))))))
7736 /* cabs(x+0i) or cabs(0+xi) -> abs(x). */
7738 (CABS (complex:C @0 real_zerop@1))
7741 /* trunc(trunc(x)) -> trunc(x), etc. */
7742 (for fns (TRUNC_ALL FLOOR_ALL CEIL_ALL ROUND_ALL NEARBYINT_ALL RINT_ALL)
7746 /* f(x) -> x if x is integer valued and f does nothing for such values. */
7747 (for fns (TRUNC_ALL FLOOR_ALL CEIL_ALL ROUND_ALL NEARBYINT_ALL RINT_ALL)
7749 (fns integer_valued_real_p@0)
7752 /* hypot(x,0) and hypot(0,x) -> abs(x). */
7754 (HYPOT:c @0 real_zerop@1)
7757 /* pow(1,x) -> 1. */
7759 (POW real_onep@0 @1)
7763 /* copysign(x,x) -> x. */
7764 (COPYSIGN_ALL @0 @0)
7768 /* copysign(x,-x) -> -x. */
7769 (COPYSIGN_ALL @0 (negate@1 @0))
7773 /* copysign(x,y) -> fabs(x) if y is nonnegative. */
7774 (COPYSIGN_ALL @0 tree_expr_nonnegative_p@1)
7778 /* fabs (copysign(x, y)) -> fabs (x). */
7779 (abs (COPYSIGN_ALL @0 @1))
7782 (for scale (LDEXP SCALBN SCALBLN)
7783 /* ldexp(0, x) -> 0. */
7785 (scale real_zerop@0 @1)
7787 /* ldexp(x, 0) -> x. */
7789 (scale @0 integer_zerop@1)
7791 /* ldexp(x, y) -> x if x is +-Inf or NaN. */
7793 (scale REAL_CST@0 @1)
7794 (if (!real_isfinite (TREE_REAL_CST_PTR (@0)))
7797 /* Canonicalization of sequences of math builtins. These rules represent
7798 IL simplifications but are not necessarily optimizations.
7800 The sincos pass is responsible for picking "optimal" implementations
7801 of math builtins, which may be more complicated and can sometimes go
7802 the other way, e.g. converting pow into a sequence of sqrts.
7803 We only want to do these canonicalizations before the pass has run. */
7805 (if (flag_unsafe_math_optimizations && canonicalize_math_p ())
7806 /* Simplify tan(x) * cos(x) -> sin(x). */
7808 (mult:c (TAN:s @0) (COS:s @0))
7811 /* Simplify x * pow(x,c) -> pow(x,c+1). */
7813 (mult:c @0 (POW:s @0 REAL_CST@1))
7814 (if (!TREE_OVERFLOW (@1))
7815 (POW @0 (plus @1 { build_one_cst (type); }))))
7817 /* Simplify sin(x) / cos(x) -> tan(x). */
7819 (rdiv (SIN:s @0) (COS:s @0))
7822 /* Simplify sinh(x) / cosh(x) -> tanh(x). */
7824 (rdiv (SINH:s @0) (COSH:s @0))
7827 /* Simplify tanh (x) / sinh (x) -> 1.0 / cosh (x). */
7829 (rdiv (TANH:s @0) (SINH:s @0))
7830 (rdiv {build_one_cst (type);} (COSH @0)))
7832 /* Simplify cos(x) / sin(x) -> 1 / tan(x). */
7834 (rdiv (COS:s @0) (SIN:s @0))
7835 (rdiv { build_one_cst (type); } (TAN @0)))
7837 /* Simplify sin(x) / tan(x) -> cos(x). */
7839 (rdiv (SIN:s @0) (TAN:s @0))
7840 (if (! HONOR_NANS (@0)
7841 && ! HONOR_INFINITIES (@0))
7844 /* Simplify tan(x) / sin(x) -> 1.0 / cos(x). */
7846 (rdiv (TAN:s @0) (SIN:s @0))
7847 (if (! HONOR_NANS (@0)
7848 && ! HONOR_INFINITIES (@0))
7849 (rdiv { build_one_cst (type); } (COS @0))))
7851 /* Simplify pow(x,y) * pow(x,z) -> pow(x,y+z). */
7853 (mult (POW:s @0 @1) (POW:s @0 @2))
7854 (POW @0 (plus @1 @2)))
7856 /* Simplify pow(x,y) * pow(z,y) -> pow(x*z,y). */
7858 (mult (POW:s @0 @1) (POW:s @2 @1))
7859 (POW (mult @0 @2) @1))
7861 /* Simplify powi(x,y) * powi(z,y) -> powi(x*z,y). */
7863 (mult (POWI:s @0 @1) (POWI:s @2 @1))
7864 (POWI (mult @0 @2) @1))
7866 /* Simplify pow(x,c) / x -> pow(x,c-1). */
7868 (rdiv (POW:s @0 REAL_CST@1) @0)
7869 (if (!TREE_OVERFLOW (@1))
7870 (POW @0 (minus @1 { build_one_cst (type); }))))
7872 /* Simplify x / pow (y,z) -> x * pow(y,-z). */
7874 (rdiv @0 (POW:s @1 @2))
7875 (mult @0 (POW @1 (negate @2))))
7880 /* sqrt(sqrt(x)) -> pow(x,1/4). */
7883 (pows @0 { build_real (type, dconst_quarter ()); }))
7884 /* sqrt(cbrt(x)) -> pow(x,1/6). */
7887 (pows @0 { build_real_truncate (type, dconst_sixth ()); }))
7888 /* cbrt(sqrt(x)) -> pow(x,1/6). */
7891 (pows @0 { build_real_truncate (type, dconst_sixth ()); }))
7892 /* cbrt(cbrt(x)) -> pow(x,1/9), iff x is nonnegative. */
7894 (cbrts (cbrts tree_expr_nonnegative_p@0))
7895 (pows @0 { build_real_truncate (type, dconst_ninth ()); }))
7896 /* sqrt(pow(x,y)) -> pow(|x|,y*0.5). */
7898 (sqrts (pows @0 @1))
7899 (pows (abs @0) (mult @1 { build_real (type, dconsthalf); })))
7900 /* cbrt(pow(x,y)) -> pow(x,y/3), iff x is nonnegative. */
7902 (cbrts (pows tree_expr_nonnegative_p@0 @1))
7903 (pows @0 (mult @1 { build_real_truncate (type, dconst_third ()); })))
7904 /* pow(sqrt(x),y) -> pow(x,y*0.5). */
7906 (pows (sqrts @0) @1)
7907 (pows @0 (mult @1 { build_real (type, dconsthalf); })))
7908 /* pow(cbrt(x),y) -> pow(x,y/3) iff x is nonnegative. */
7910 (pows (cbrts tree_expr_nonnegative_p@0) @1)
7911 (pows @0 (mult @1 { build_real_truncate (type, dconst_third ()); })))
7912 /* pow(pow(x,y),z) -> pow(x,y*z) iff x is nonnegative. */
7914 (pows (pows tree_expr_nonnegative_p@0 @1) @2)
7915 (pows @0 (mult @1 @2))))
7917 /* cabs(x+xi) -> fabs(x)*sqrt(2). */
7919 (CABS (complex @0 @0))
7920 (mult (abs @0) { build_real_truncate (type, dconst_sqrt2 ()); }))
7922 /* hypot(x,x) -> fabs(x)*sqrt(2). */
7925 (mult (abs @0) { build_real_truncate (type, dconst_sqrt2 ()); }))
7927 /* cexp(x+yi) -> exp(x)*cexpi(y). */
7932 (cexps compositional_complex@0)
7933 (if (targetm.libc_has_function (function_c99_math_complex, TREE_TYPE (@0)))
7935 (mult (exps@1 (realpart @0)) (realpart (cexpis:type@2 (imagpart @0))))
7936 (mult @1 (imagpart @2)))))))
7938 (if (canonicalize_math_p ())
7939 /* floor(x) -> trunc(x) if x is nonnegative. */
7940 (for floors (FLOOR_ALL)
7943 (floors tree_expr_nonnegative_p@0)
7946 (match double_value_p
7948 (if (TYPE_MAIN_VARIANT (TREE_TYPE (@0)) == double_type_node)))
7949 (for froms (BUILT_IN_TRUNCL
7961 /* truncl(extend(x)) -> extend(trunc(x)), etc., if x is a double. */
7962 (if (optimize && canonicalize_math_p ())
7964 (froms (convert double_value_p@0))
7965 (convert (tos @0)))))
7967 (match float_value_p
7969 (if (TYPE_MAIN_VARIANT (TREE_TYPE (@0)) == float_type_node)))
7970 (for froms (BUILT_IN_TRUNCL BUILT_IN_TRUNC
7971 BUILT_IN_FLOORL BUILT_IN_FLOOR
7972 BUILT_IN_CEILL BUILT_IN_CEIL
7973 BUILT_IN_ROUNDL BUILT_IN_ROUND
7974 BUILT_IN_NEARBYINTL BUILT_IN_NEARBYINT
7975 BUILT_IN_RINTL BUILT_IN_RINT)
7976 tos (BUILT_IN_TRUNCF BUILT_IN_TRUNCF
7977 BUILT_IN_FLOORF BUILT_IN_FLOORF
7978 BUILT_IN_CEILF BUILT_IN_CEILF
7979 BUILT_IN_ROUNDF BUILT_IN_ROUNDF
7980 BUILT_IN_NEARBYINTF BUILT_IN_NEARBYINTF
7981 BUILT_IN_RINTF BUILT_IN_RINTF)
7982 /* truncl(extend(x)) and trunc(extend(x)) -> extend(truncf(x)), etc.,
7984 (if (optimize && canonicalize_math_p ()
7985 && targetm.libc_has_function (function_c99_misc, NULL_TREE))
7987 (froms (convert float_value_p@0))
7988 (convert (tos @0)))))
7991 (match float16_value_p
7993 (if (TYPE_MAIN_VARIANT (TREE_TYPE (@0)) == float16_type_node)))
7994 (for froms (BUILT_IN_TRUNCL BUILT_IN_TRUNC BUILT_IN_TRUNCF
7995 BUILT_IN_FLOORL BUILT_IN_FLOOR BUILT_IN_FLOORF
7996 BUILT_IN_CEILL BUILT_IN_CEIL BUILT_IN_CEILF
7997 BUILT_IN_ROUNDEVENL BUILT_IN_ROUNDEVEN BUILT_IN_ROUNDEVENF
7998 BUILT_IN_ROUNDL BUILT_IN_ROUND BUILT_IN_ROUNDF
7999 BUILT_IN_NEARBYINTL BUILT_IN_NEARBYINT BUILT_IN_NEARBYINTF
8000 BUILT_IN_RINTL BUILT_IN_RINT BUILT_IN_RINTF
8001 BUILT_IN_SQRTL BUILT_IN_SQRT BUILT_IN_SQRTF)
8002 tos (IFN_TRUNC IFN_TRUNC IFN_TRUNC
8003 IFN_FLOOR IFN_FLOOR IFN_FLOOR
8004 IFN_CEIL IFN_CEIL IFN_CEIL
8005 IFN_ROUNDEVEN IFN_ROUNDEVEN IFN_ROUNDEVEN
8006 IFN_ROUND IFN_ROUND IFN_ROUND
8007 IFN_NEARBYINT IFN_NEARBYINT IFN_NEARBYINT
8008 IFN_RINT IFN_RINT IFN_RINT
8009 IFN_SQRT IFN_SQRT IFN_SQRT)
8010 /* (_Float16) round ((doube) x) -> __built_in_roundf16 (x), etc.,
8011 if x is a _Float16. */
8013 (convert (froms (convert float16_value_p@0)))
8015 && types_match (type, TREE_TYPE (@0))
8016 && direct_internal_fn_supported_p (as_internal_fn (tos),
8017 type, OPTIMIZE_FOR_BOTH))
8020 /* Simplify (trunc)copysign ((extend)x, (extend)y) to copysignf (x, y),
8021 x,y is float value, similar for _Float16/double. */
8022 (for copysigns (COPYSIGN_ALL)
8024 (convert (copysigns (convert@2 @0) (convert @1)))
8026 && !HONOR_SNANS (@2)
8027 && types_match (type, TREE_TYPE (@0))
8028 && types_match (type, TREE_TYPE (@1))
8029 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (@2))
8030 && direct_internal_fn_supported_p (IFN_COPYSIGN,
8031 type, OPTIMIZE_FOR_BOTH))
8032 (IFN_COPYSIGN @0 @1))))
8034 (for froms (BUILT_IN_FMAF BUILT_IN_FMA BUILT_IN_FMAL)
8035 tos (IFN_FMA IFN_FMA IFN_FMA)
8037 (convert (froms (convert@3 @0) (convert @1) (convert @2)))
8038 (if (flag_unsafe_math_optimizations
8040 && FLOAT_TYPE_P (type)
8041 && FLOAT_TYPE_P (TREE_TYPE (@3))
8042 && types_match (type, TREE_TYPE (@0))
8043 && types_match (type, TREE_TYPE (@1))
8044 && types_match (type, TREE_TYPE (@2))
8045 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (@3))
8046 && direct_internal_fn_supported_p (as_internal_fn (tos),
8047 type, OPTIMIZE_FOR_BOTH))
8050 (for maxmin (max min)
8052 (convert (maxmin (convert@2 @0) (convert @1)))
8054 && FLOAT_TYPE_P (type)
8055 && FLOAT_TYPE_P (TREE_TYPE (@2))
8056 && types_match (type, TREE_TYPE (@0))
8057 && types_match (type, TREE_TYPE (@1))
8058 && element_precision (type) < element_precision (TREE_TYPE (@2)))
8062 (for froms (XFLOORL XCEILL XROUNDL XRINTL)
8063 tos (XFLOOR XCEIL XROUND XRINT)
8064 /* llfloorl(extend(x)) -> llfloor(x), etc., if x is a double. */
8065 (if (optimize && canonicalize_math_p ())
8067 (froms (convert double_value_p@0))
8070 (for froms (XFLOORL XCEILL XROUNDL XRINTL
8071 XFLOOR XCEIL XROUND XRINT)
8072 tos (XFLOORF XCEILF XROUNDF XRINTF)
8073 /* llfloorl(extend(x)) and llfloor(extend(x)) -> llfloorf(x), etc.,
8075 (if (optimize && canonicalize_math_p ())
8077 (froms (convert float_value_p@0))
8080 (if (canonicalize_math_p ())
8081 /* xfloor(x) -> fix_trunc(x) if x is nonnegative. */
8082 (for floors (IFLOOR LFLOOR LLFLOOR)
8084 (floors tree_expr_nonnegative_p@0)
8087 (if (canonicalize_math_p ())
8088 /* xfloor(x) -> fix_trunc(x), etc., if x is integer valued. */
8089 (for fns (IFLOOR LFLOOR LLFLOOR
8091 IROUND LROUND LLROUND)
8093 (fns integer_valued_real_p@0)
8095 (if (!flag_errno_math)
8096 /* xrint(x) -> fix_trunc(x), etc., if x is integer valued. */
8097 (for rints (IRINT LRINT LLRINT)
8099 (rints integer_valued_real_p@0)
8102 (if (canonicalize_math_p ())
8103 (for ifn (IFLOOR ICEIL IROUND IRINT)
8104 lfn (LFLOOR LCEIL LROUND LRINT)
8105 llfn (LLFLOOR LLCEIL LLROUND LLRINT)
8106 /* Canonicalize iround (x) to lround (x) on ILP32 targets where
8107 sizeof (int) == sizeof (long). */
8108 (if (TYPE_PRECISION (integer_type_node)
8109 == TYPE_PRECISION (long_integer_type_node))
8112 (lfn:long_integer_type_node @0)))
8113 /* Canonicalize llround (x) to lround (x) on LP64 targets where
8114 sizeof (long long) == sizeof (long). */
8115 (if (TYPE_PRECISION (long_long_integer_type_node)
8116 == TYPE_PRECISION (long_integer_type_node))
8119 (lfn:long_integer_type_node @0)))))
8121 /* cproj(x) -> x if we're ignoring infinities. */
8124 (if (!HONOR_INFINITIES (type))
8127 /* If the real part is inf and the imag part is known to be
8128 nonnegative, return (inf + 0i). */
8130 (CPROJ (complex REAL_CST@0 tree_expr_nonnegative_p@1))
8131 (if (real_isinf (TREE_REAL_CST_PTR (@0)))
8132 { build_complex_inf (type, false); }))
8134 /* If the imag part is inf, return (inf+I*copysign(0,imag)). */
8136 (CPROJ (complex @0 REAL_CST@1))
8137 (if (real_isinf (TREE_REAL_CST_PTR (@1)))
8138 { build_complex_inf (type, TREE_REAL_CST_PTR (@1)->sign); }))
8144 (pows @0 REAL_CST@1)
8146 const REAL_VALUE_TYPE *value = TREE_REAL_CST_PTR (@1);
8147 REAL_VALUE_TYPE tmp;
8150 /* pow(x,0) -> 1. */
8151 (if (real_equal (value, &dconst0))
8152 { build_real (type, dconst1); })
8153 /* pow(x,1) -> x. */
8154 (if (real_equal (value, &dconst1))
8156 /* pow(x,-1) -> 1/x. */
8157 (if (real_equal (value, &dconstm1))
8158 (rdiv { build_real (type, dconst1); } @0))
8159 /* pow(x,0.5) -> sqrt(x). */
8160 (if (flag_unsafe_math_optimizations
8161 && canonicalize_math_p ()
8162 && real_equal (value, &dconsthalf))
8164 /* pow(x,1/3) -> cbrt(x). */
8165 (if (flag_unsafe_math_optimizations
8166 && canonicalize_math_p ()
8167 && (tmp = real_value_truncate (TYPE_MODE (type), dconst_third ()),
8168 real_equal (value, &tmp)))
8171 /* powi(1,x) -> 1. */
8173 (POWI real_onep@0 @1)
8177 (POWI @0 INTEGER_CST@1)
8179 /* powi(x,0) -> 1. */
8180 (if (wi::to_wide (@1) == 0)
8181 { build_real (type, dconst1); })
8182 /* powi(x,1) -> x. */
8183 (if (wi::to_wide (@1) == 1)
8185 /* powi(x,-1) -> 1/x. */
8186 (if (wi::to_wide (@1) == -1)
8187 (rdiv { build_real (type, dconst1); } @0))))
8189 /* Narrowing of arithmetic and logical operations.
8191 These are conceptually similar to the transformations performed for
8192 the C/C++ front-ends by shorten_binary_op and shorten_compare. Long
8193 term we want to move all that code out of the front-ends into here. */
8195 /* Convert (outertype)((innertype0)a+(innertype1)b)
8196 into ((newtype)a+(newtype)b) where newtype
8197 is the widest mode from all of these. */
8198 (for op (plus minus mult rdiv)
8200 (convert (op:s@0 (convert1?@3 @1) (convert2?@4 @2)))
8201 /* If we have a narrowing conversion of an arithmetic operation where
8202 both operands are widening conversions from the same type as the outer
8203 narrowing conversion. Then convert the innermost operands to a
8204 suitable unsigned type (to avoid introducing undefined behavior),
8205 perform the operation and convert the result to the desired type. */
8206 (if (INTEGRAL_TYPE_P (type)
8209 /* We check for type compatibility between @0 and @1 below,
8210 so there's no need to check that @2/@4 are integral types. */
8211 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
8212 && INTEGRAL_TYPE_P (TREE_TYPE (@3))
8213 /* The precision of the type of each operand must match the
8214 precision of the mode of each operand, similarly for the
8216 && type_has_mode_precision_p (TREE_TYPE (@1))
8217 && type_has_mode_precision_p (TREE_TYPE (@2))
8218 && type_has_mode_precision_p (type)
8219 /* The inner conversion must be a widening conversion. */
8220 && TYPE_PRECISION (TREE_TYPE (@3)) > TYPE_PRECISION (TREE_TYPE (@1))
8221 && types_match (@1, type)
8222 && (types_match (@1, @2)
8223 /* Or the second operand is const integer or converted const
8224 integer from valueize. */
8225 || poly_int_tree_p (@4)))
8226 (if (TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
8227 (op @1 (convert @2))
8228 (with { tree utype = unsigned_type_for (TREE_TYPE (@1)); }
8229 (convert (op (convert:utype @1)
8230 (convert:utype @2)))))
8231 (if (FLOAT_TYPE_P (type)
8232 && DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@0))
8233 == DECIMAL_FLOAT_TYPE_P (type))
8234 (with { tree arg0 = strip_float_extensions (@1);
8235 tree arg1 = strip_float_extensions (@2);
8236 tree itype = TREE_TYPE (@0);
8237 tree ty1 = TREE_TYPE (arg0);
8238 tree ty2 = TREE_TYPE (arg1);
8239 enum tree_code code = TREE_CODE (itype); }
8240 (if (FLOAT_TYPE_P (ty1)
8241 && FLOAT_TYPE_P (ty2))
8242 (with { tree newtype = type;
8243 if (TYPE_MODE (ty1) == SDmode
8244 || TYPE_MODE (ty2) == SDmode
8245 || TYPE_MODE (type) == SDmode)
8246 newtype = dfloat32_type_node;
8247 if (TYPE_MODE (ty1) == DDmode
8248 || TYPE_MODE (ty2) == DDmode
8249 || TYPE_MODE (type) == DDmode)
8250 newtype = dfloat64_type_node;
8251 if (TYPE_MODE (ty1) == TDmode
8252 || TYPE_MODE (ty2) == TDmode
8253 || TYPE_MODE (type) == TDmode)
8254 newtype = dfloat128_type_node; }
8255 (if ((newtype == dfloat32_type_node
8256 || newtype == dfloat64_type_node
8257 || newtype == dfloat128_type_node)
8259 && types_match (newtype, type))
8260 (op (convert:newtype @1) (convert:newtype @2))
8261 (with { if (element_precision (ty1) > element_precision (newtype))
8263 if (element_precision (ty2) > element_precision (newtype))
8265 /* Sometimes this transformation is safe (cannot
8266 change results through affecting double rounding
8267 cases) and sometimes it is not. If NEWTYPE is
8268 wider than TYPE, e.g. (float)((long double)double
8269 + (long double)double) converted to
8270 (float)(double + double), the transformation is
8271 unsafe regardless of the details of the types
8272 involved; double rounding can arise if the result
8273 of NEWTYPE arithmetic is a NEWTYPE value half way
8274 between two representable TYPE values but the
8275 exact value is sufficiently different (in the
8276 right direction) for this difference to be
8277 visible in ITYPE arithmetic. If NEWTYPE is the
8278 same as TYPE, however, the transformation may be
8279 safe depending on the types involved: it is safe
8280 if the ITYPE has strictly more than twice as many
8281 mantissa bits as TYPE, can represent infinities
8282 and NaNs if the TYPE can, and has sufficient
8283 exponent range for the product or ratio of two
8284 values representable in the TYPE to be within the
8285 range of normal values of ITYPE. */
8286 (if (element_precision (newtype) < element_precision (itype)
8287 && (!VECTOR_MODE_P (TYPE_MODE (newtype))
8288 || target_supports_op_p (newtype, op, optab_default))
8289 && (flag_unsafe_math_optimizations
8290 || (element_precision (newtype) == element_precision (type)
8291 && real_can_shorten_arithmetic (element_mode (itype),
8292 element_mode (type))
8293 && !excess_precision_type (newtype)))
8294 && !types_match (itype, newtype))
8295 (convert:type (op (convert:newtype @1)
8296 (convert:newtype @2)))
8301 /* This is another case of narrowing, specifically when there's an outer
8302 BIT_AND_EXPR which masks off bits outside the type of the innermost
8303 operands. Like the previous case we have to convert the operands
8304 to unsigned types to avoid introducing undefined behavior for the
8305 arithmetic operation. */
8306 (for op (minus plus)
8308 (bit_and (op:s (convert@2 @0) (convert@3 @1)) INTEGER_CST@4)
8309 (if (INTEGRAL_TYPE_P (type)
8310 /* We check for type compatibility between @0 and @1 below,
8311 so there's no need to check that @1/@3 are integral types. */
8312 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
8313 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
8314 /* The precision of the type of each operand must match the
8315 precision of the mode of each operand, similarly for the
8317 && type_has_mode_precision_p (TREE_TYPE (@0))
8318 && type_has_mode_precision_p (TREE_TYPE (@1))
8319 && type_has_mode_precision_p (type)
8320 /* The inner conversion must be a widening conversion. */
8321 && TYPE_PRECISION (TREE_TYPE (@2)) > TYPE_PRECISION (TREE_TYPE (@0))
8322 && types_match (@0, @1)
8323 && (tree_int_cst_min_precision (@4, TYPE_SIGN (TREE_TYPE (@0)))
8324 <= TYPE_PRECISION (TREE_TYPE (@0)))
8325 && (wi::to_wide (@4)
8326 & wi::mask (TYPE_PRECISION (TREE_TYPE (@0)),
8327 true, TYPE_PRECISION (type))) == 0)
8328 (if (TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
8329 (with { tree ntype = TREE_TYPE (@0); }
8330 (convert (bit_and (op @0 @1) (convert:ntype @4))))
8331 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
8332 (convert (bit_and (op (convert:utype @0) (convert:utype @1))
8333 (convert:utype @4))))))))
8335 /* Transform (@0 < @1 and @0 < @2) to use min,
8336 (@0 > @1 and @0 > @2) to use max */
8337 (for logic (bit_and bit_and bit_and bit_and bit_ior bit_ior bit_ior bit_ior)
8338 op (lt le gt ge lt le gt ge )
8339 ext (min min max max max max min min )
8341 (logic (op:cs @0 @1) (op:cs @0 @2))
8342 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
8343 && TREE_CODE (@0) != INTEGER_CST)
8344 (op @0 (ext @1 @2)))))
8346 /* Max<bool0, bool1> -> bool0 | bool1
8347 Min<bool0, bool1> -> bool0 & bool1 */
8349 logic (bit_ior bit_and)
8351 (op zero_one_valued_p@0 zero_one_valued_p@1)
8354 /* signbit(x) != 0 ? -x : x -> abs(x)
8355 signbit(x) == 0 ? -x : x -> -abs(x) */
8359 (cond (neeq (sign @0) integer_zerop) (negate @0) @0)
8360 (if (neeq == NE_EXPR)
8362 (negate (abs @0))))))
8365 /* signbit(x) -> 0 if x is nonnegative. */
8366 (SIGNBIT tree_expr_nonnegative_p@0)
8367 { integer_zero_node; })
8370 /* signbit(x) -> x<0 if x doesn't have signed zeros. */
8372 (if (!HONOR_SIGNED_ZEROS (@0))
8373 (convert (lt @0 { build_real (TREE_TYPE (@0), dconst0); }))))
8375 /* Transform comparisons of the form X +- C1 CMP C2 to X CMP C2 -+ C1. */
8377 (for op (plus minus)
8380 (cmp (op@3 @0 INTEGER_CST@1) INTEGER_CST@2)
8381 (if (!TREE_OVERFLOW (@1) && !TREE_OVERFLOW (@2)
8382 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@0))
8383 && !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@0))
8384 && !TYPE_SATURATING (TREE_TYPE (@0)))
8385 (with { tree res = int_const_binop (rop, @2, @1); }
8386 (if (TREE_OVERFLOW (res)
8387 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
8388 { constant_boolean_node (cmp == NE_EXPR, type); }
8389 (if (single_use (@3))
8390 (cmp @0 { TREE_OVERFLOW (res)
8391 ? drop_tree_overflow (res) : res; }))))))))
8392 (for cmp (lt le gt ge)
8393 (for op (plus minus)
8396 (cmp (op@3 @0 INTEGER_CST@1) INTEGER_CST@2)
8397 (if (!TREE_OVERFLOW (@1) && !TREE_OVERFLOW (@2)
8398 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
8399 (with { tree res = int_const_binop (rop, @2, @1); }
8400 (if (TREE_OVERFLOW (res))
8402 fold_overflow_warning (("assuming signed overflow does not occur "
8403 "when simplifying conditional to constant"),
8404 WARN_STRICT_OVERFLOW_CONDITIONAL);
8405 bool less = cmp == LE_EXPR || cmp == LT_EXPR;
8406 /* wi::ges_p (@2, 0) should be sufficient for a signed type. */
8407 bool ovf_high = wi::lt_p (wi::to_wide (@1), 0,
8408 TYPE_SIGN (TREE_TYPE (@1)))
8409 != (op == MINUS_EXPR);
8410 constant_boolean_node (less == ovf_high, type);
8412 (if (single_use (@3))
8415 fold_overflow_warning (("assuming signed overflow does not occur "
8416 "when changing X +- C1 cmp C2 to "
8418 WARN_STRICT_OVERFLOW_COMPARISON);
8420 (cmp @0 { res; })))))))))
8422 /* Canonicalizations of BIT_FIELD_REFs. */
8425 (BIT_FIELD_REF (BIT_FIELD_REF @0 @1 @2) @3 @4)
8426 (BIT_FIELD_REF @0 @3 { const_binop (PLUS_EXPR, bitsizetype, @2, @4); }))
8429 (BIT_FIELD_REF (view_convert @0) @1 @2)
8430 (if (! INTEGRAL_TYPE_P (TREE_TYPE (@0))
8431 || type_has_mode_precision_p (TREE_TYPE (@0)))
8432 (BIT_FIELD_REF @0 @1 @2)))
8435 (BIT_FIELD_REF @0 @1 integer_zerop)
8436 (if (tree_int_cst_equal (@1, TYPE_SIZE (TREE_TYPE (@0))))
8440 (BIT_FIELD_REF @0 @1 @2)
8442 (if (TREE_CODE (TREE_TYPE (@0)) == COMPLEX_TYPE
8443 && tree_int_cst_equal (@1, TYPE_SIZE (TREE_TYPE (TREE_TYPE (@0)))))
8445 (if (integer_zerop (@2))
8446 (view_convert (realpart @0)))
8447 (if (tree_int_cst_equal (@2, TYPE_SIZE (TREE_TYPE (TREE_TYPE (@0)))))
8448 (view_convert (imagpart @0)))))
8449 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
8450 && INTEGRAL_TYPE_P (type)
8451 /* On GIMPLE this should only apply to register arguments. */
8452 && (! GIMPLE || is_gimple_reg (@0))
8453 /* A bit-field-ref that referenced the full argument can be stripped. */
8454 && ((compare_tree_int (@1, TYPE_PRECISION (TREE_TYPE (@0))) == 0
8455 && integer_zerop (@2))
8456 /* Low-parts can be reduced to integral conversions.
8457 ??? The following doesn't work for PDP endian. */
8458 || (BYTES_BIG_ENDIAN == WORDS_BIG_ENDIAN
8459 /* But only do this after vectorization. */
8460 && canonicalize_math_after_vectorization_p ()
8461 /* Don't even think about BITS_BIG_ENDIAN. */
8462 && TYPE_PRECISION (TREE_TYPE (@0)) % BITS_PER_UNIT == 0
8463 && TYPE_PRECISION (type) % BITS_PER_UNIT == 0
8464 && compare_tree_int (@2, (BYTES_BIG_ENDIAN
8465 ? (TYPE_PRECISION (TREE_TYPE (@0))
8466 - TYPE_PRECISION (type))
8470 /* Simplify vector extracts. */
8473 (BIT_FIELD_REF CONSTRUCTOR@0 @1 @2)
8474 (if (VECTOR_TYPE_P (TREE_TYPE (@0))
8475 && tree_fits_uhwi_p (TYPE_SIZE (type))
8476 && ((tree_to_uhwi (TYPE_SIZE (type))
8477 == tree_to_uhwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (@0)))))
8478 || (VECTOR_TYPE_P (type)
8479 && (tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)))
8480 == tree_to_uhwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (@0))))))))
8483 tree ctor = (TREE_CODE (@0) == SSA_NAME
8484 ? gimple_assign_rhs1 (SSA_NAME_DEF_STMT (@0)) : @0);
8485 tree eltype = TREE_TYPE (TREE_TYPE (ctor));
8486 unsigned HOST_WIDE_INT width = tree_to_uhwi (TYPE_SIZE (eltype));
8487 unsigned HOST_WIDE_INT n = tree_to_uhwi (@1);
8488 unsigned HOST_WIDE_INT idx = tree_to_uhwi (@2);
8491 && (idx % width) == 0
8493 && known_le ((idx + n) / width,
8494 TYPE_VECTOR_SUBPARTS (TREE_TYPE (ctor))))
8499 /* Constructor elements can be subvectors. */
8501 if (CONSTRUCTOR_NELTS (ctor) != 0)
8503 tree cons_elem = TREE_TYPE (CONSTRUCTOR_ELT (ctor, 0)->value);
8504 if (TREE_CODE (cons_elem) == VECTOR_TYPE)
8505 k = TYPE_VECTOR_SUBPARTS (cons_elem);
8507 unsigned HOST_WIDE_INT elt, count, const_k;
8510 /* We keep an exact subset of the constructor elements. */
8511 (if (multiple_p (idx, k, &elt) && multiple_p (n, k, &count))
8512 (if (CONSTRUCTOR_NELTS (ctor) == 0)
8513 { build_zero_cst (type); }
8515 (if (elt < CONSTRUCTOR_NELTS (ctor))
8516 (view_convert { CONSTRUCTOR_ELT (ctor, elt)->value; })
8517 { build_zero_cst (type); })
8518 /* We don't want to emit new CTORs unless the old one goes away.
8519 ??? Eventually allow this if the CTOR ends up constant or
8521 (if (single_use (@0))
8524 vec<constructor_elt, va_gc> *vals;
8525 vec_alloc (vals, count);
8526 bool constant_p = true;
8528 for (unsigned i = 0;
8529 i < count && elt + i < CONSTRUCTOR_NELTS (ctor); ++i)
8531 tree e = CONSTRUCTOR_ELT (ctor, elt + i)->value;
8532 CONSTRUCTOR_APPEND_ELT (vals, NULL_TREE, e);
8533 if (!CONSTANT_CLASS_P (e))
8536 tree evtype = (types_match (TREE_TYPE (type),
8537 TREE_TYPE (TREE_TYPE (ctor)))
8539 : build_vector_type (TREE_TYPE (TREE_TYPE (ctor)),
8541 /* We used to build a CTOR in the non-constant case here
8542 but that's not a GIMPLE value. We'd have to expose this
8543 operation somehow so the code generation can properly
8544 split it out to a separate stmt. */
8545 res = (constant_p ? build_vector_from_ctor (evtype, vals)
8546 : (GIMPLE ? NULL_TREE : build_constructor (evtype, vals)));
8549 (view_convert { res; })))))))
8550 /* The bitfield references a single constructor element. */
8551 (if (k.is_constant (&const_k)
8552 && idx + n <= (idx / const_k + 1) * const_k)
8554 (if (CONSTRUCTOR_NELTS (ctor) <= idx / const_k)
8555 { build_zero_cst (type); })
8557 (view_convert { CONSTRUCTOR_ELT (ctor, idx / const_k)->value; }))
8558 (BIT_FIELD_REF { CONSTRUCTOR_ELT (ctor, idx / const_k)->value; }
8559 @1 { bitsize_int ((idx % const_k) * width); })))))))))
8561 /* Simplify a bit extraction from a bit insertion for the cases with
8562 the inserted element fully covering the extraction or the insertion
8563 not touching the extraction. */
8565 (BIT_FIELD_REF (bit_insert @0 @1 @ipos) @rsize @rpos)
8568 unsigned HOST_WIDE_INT isize;
8569 if (INTEGRAL_TYPE_P (TREE_TYPE (@1)))
8570 isize = TYPE_PRECISION (TREE_TYPE (@1));
8572 isize = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (@1)));
8575 (if ((!INTEGRAL_TYPE_P (TREE_TYPE (@1))
8576 || type_has_mode_precision_p (TREE_TYPE (@1)))
8577 && wi::leu_p (wi::to_wide (@ipos), wi::to_wide (@rpos))
8578 && wi::leu_p (wi::to_wide (@rpos) + wi::to_wide (@rsize),
8579 wi::to_wide (@ipos) + isize))
8580 (BIT_FIELD_REF @1 @rsize { wide_int_to_tree (bitsizetype,
8582 - wi::to_wide (@ipos)); }))
8583 (if (wi::eq_p (wi::to_wide (@ipos), wi::to_wide (@rpos))
8584 && compare_tree_int (@rsize, isize) == 0)
8586 (if (wi::geu_p (wi::to_wide (@ipos),
8587 wi::to_wide (@rpos) + wi::to_wide (@rsize))
8588 || wi::geu_p (wi::to_wide (@rpos),
8589 wi::to_wide (@ipos) + isize))
8590 (BIT_FIELD_REF @0 @rsize @rpos)))))
8592 /* Simplify vector inserts of other vector extracts to a permute. */
8594 (bit_insert @0 (BIT_FIELD_REF@2 @1 @rsize @rpos) @ipos)
8595 (if (VECTOR_TYPE_P (type)
8596 && (VECTOR_MODE_P (TYPE_MODE (type))
8597 || optimize_vectors_before_lowering_p ())
8598 && types_match (@0, @1)
8599 && types_match (TREE_TYPE (TREE_TYPE (@0)), TREE_TYPE (@2))
8600 && TYPE_VECTOR_SUBPARTS (type).is_constant ()
8601 && multiple_p (wi::to_poly_offset (@rpos),
8602 wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (type)))))
8605 unsigned HOST_WIDE_INT elsz
8606 = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (@1))));
8607 poly_uint64 relt = exact_div (tree_to_poly_uint64 (@rpos), elsz);
8608 poly_uint64 ielt = exact_div (tree_to_poly_uint64 (@ipos), elsz);
8609 unsigned nunits = TYPE_VECTOR_SUBPARTS (type).to_constant ();
8610 vec_perm_builder builder;
8611 builder.new_vector (nunits, nunits, 1);
8612 for (unsigned i = 0; i < nunits; ++i)
8613 builder.quick_push (known_eq (ielt, i) ? nunits + relt : i);
8614 vec_perm_indices sel (builder, 2, nunits);
8616 (if (!VECTOR_MODE_P (TYPE_MODE (type))
8617 || can_vec_perm_const_p (TYPE_MODE (type), TYPE_MODE (type), sel, false))
8618 (vec_perm @0 @1 { vec_perm_indices_to_tree
8619 (build_vector_type (ssizetype, nunits), sel); })))))
8621 (if (canonicalize_math_after_vectorization_p ())
8624 (fmas:c (negate @0) @1 @2)
8625 (IFN_FNMA @0 @1 @2))
8627 (fmas @0 @1 (negate @2))
8630 (fmas:c (negate @0) @1 (negate @2))
8631 (IFN_FNMS @0 @1 @2))
8633 (negate (fmas@3 @0 @1 @2))
8634 (if (single_use (@3))
8635 (IFN_FNMS @0 @1 @2))))
8638 (IFN_FMS:c (negate @0) @1 @2)
8639 (IFN_FNMS @0 @1 @2))
8641 (IFN_FMS @0 @1 (negate @2))
8644 (IFN_FMS:c (negate @0) @1 (negate @2))
8645 (IFN_FNMA @0 @1 @2))
8647 (negate (IFN_FMS@3 @0 @1 @2))
8648 (if (single_use (@3))
8649 (IFN_FNMA @0 @1 @2)))
8652 (IFN_FNMA:c (negate @0) @1 @2)
8655 (IFN_FNMA @0 @1 (negate @2))
8656 (IFN_FNMS @0 @1 @2))
8658 (IFN_FNMA:c (negate @0) @1 (negate @2))
8661 (negate (IFN_FNMA@3 @0 @1 @2))
8662 (if (single_use (@3))
8663 (IFN_FMS @0 @1 @2)))
8666 (IFN_FNMS:c (negate @0) @1 @2)
8669 (IFN_FNMS @0 @1 (negate @2))
8670 (IFN_FNMA @0 @1 @2))
8672 (IFN_FNMS:c (negate @0) @1 (negate @2))
8675 (negate (IFN_FNMS@3 @0 @1 @2))
8676 (if (single_use (@3))
8677 (IFN_FMA @0 @1 @2))))
8679 /* CLZ simplifications. */
8684 (op (clz:s@2 @0) INTEGER_CST@1)
8685 (if (integer_zerop (@1) && single_use (@2))
8686 /* clz(X) == 0 is (int)X < 0 and clz(X) != 0 is (int)X >= 0. */
8687 (with { tree stype = signed_type_for (TREE_TYPE (@0)); }
8688 (cmp (convert:stype @0) { build_zero_cst (stype); }))
8689 /* clz(X) == (prec-1) is X == 1 and clz(X) != (prec-1) is X != 1. */
8690 (if (wi::to_wide (@1) == TYPE_PRECISION (TREE_TYPE (@0)) - 1)
8691 (op @0 { build_one_cst (TREE_TYPE (@0)); }))))))
8695 (op (IFN_CLZ:s@2 @0 @3) INTEGER_CST@1)
8696 (if (integer_zerop (@1) && single_use (@2))
8697 /* clz(X) == 0 is (int)X < 0 and clz(X) != 0 is (int)X >= 0. */
8698 (with { tree type0 = TREE_TYPE (@0);
8699 tree stype = signed_type_for (TREE_TYPE (@0));
8700 /* Punt if clz(0) == 0. */
8701 if (integer_zerop (@3))
8705 (cmp (convert:stype @0) { build_zero_cst (stype); })))
8706 /* clz(X) == (prec-1) is X == 1 and clz(X) != (prec-1) is X != 1. */
8707 (with { bool ok = true;
8708 tree type0 = TREE_TYPE (@0);
8709 /* Punt if clz(0) == prec - 1. */
8710 if (wi::to_widest (@3) == TYPE_PRECISION (type0) - 1)
8713 (if (ok && wi::to_wide (@1) == (TYPE_PRECISION (type0) - 1))
8714 (op @0 { build_one_cst (type0); }))))))
8716 /* CTZ simplifications. */
8718 (for op (ge gt le lt)
8721 /* __builtin_ctz (x) >= C -> (x & ((1 << C) - 1)) == 0. */
8722 (op (ctz:s @0) INTEGER_CST@1)
8723 (with { bool ok = true;
8724 HOST_WIDE_INT val = 0;
8725 if (!tree_fits_shwi_p (@1))
8729 val = tree_to_shwi (@1);
8730 /* Canonicalize to >= or <. */
8731 if (op == GT_EXPR || op == LE_EXPR)
8733 if (val == HOST_WIDE_INT_MAX)
8739 tree type0 = TREE_TYPE (@0);
8740 int prec = TYPE_PRECISION (type0);
8742 (if (ok && prec <= MAX_FIXED_MODE_SIZE)
8744 { constant_boolean_node (cmp == EQ_EXPR ? true : false, type); }
8746 { constant_boolean_node (cmp == EQ_EXPR ? false : true, type); }
8747 (cmp (bit_and @0 { wide_int_to_tree (type0,
8748 wi::mask (val, false, prec)); })
8749 { build_zero_cst (type0); })))))))
8752 /* __builtin_ctz (x) == C -> (x & ((1 << (C + 1)) - 1)) == (1 << C). */
8753 (op (ctz:s @0) INTEGER_CST@1)
8754 (with { tree type0 = TREE_TYPE (@0);
8755 int prec = TYPE_PRECISION (type0);
8757 (if (prec <= MAX_FIXED_MODE_SIZE)
8758 (if (tree_int_cst_sgn (@1) < 0 || wi::to_widest (@1) >= prec)
8759 { constant_boolean_node (op == EQ_EXPR ? false : true, type); }
8760 (op (bit_and @0 { wide_int_to_tree (type0,
8761 wi::mask (tree_to_uhwi (@1) + 1,
8763 { wide_int_to_tree (type0,
8764 wi::shifted_mask (tree_to_uhwi (@1), 1,
8765 false, prec)); })))))))
8766 (for op (ge gt le lt)
8769 /* __builtin_ctz (x) >= C -> (x & ((1 << C) - 1)) == 0. */
8770 (op (IFN_CTZ:s @0 @2) INTEGER_CST@1)
8771 (with { bool ok = true;
8772 HOST_WIDE_INT val = 0;
8773 if (!tree_fits_shwi_p (@1))
8777 val = tree_to_shwi (@1);
8778 /* Canonicalize to >= or <. */
8779 if (op == GT_EXPR || op == LE_EXPR)
8781 if (val == HOST_WIDE_INT_MAX)
8787 HOST_WIDE_INT zero_val = tree_to_shwi (@2);
8788 tree type0 = TREE_TYPE (@0);
8789 int prec = TYPE_PRECISION (type0);
8790 if (prec > MAX_FIXED_MODE_SIZE)
8794 (if (ok && zero_val >= val)
8795 { constant_boolean_node (cmp == EQ_EXPR ? true : false, type); })
8797 (if (ok && zero_val < val)
8798 { constant_boolean_node (cmp == EQ_EXPR ? false : true, type); })
8799 (if (ok && (zero_val < 0 || zero_val >= prec))
8800 (cmp (bit_and @0 { wide_int_to_tree (type0,
8801 wi::mask (val, false, prec)); })
8802 { build_zero_cst (type0); })))))))
8805 /* __builtin_ctz (x) == C -> (x & ((1 << (C + 1)) - 1)) == (1 << C). */
8806 (op (IFN_CTZ:s @0 @2) INTEGER_CST@1)
8807 (with { HOST_WIDE_INT zero_val = tree_to_shwi (@2);
8808 tree type0 = TREE_TYPE (@0);
8809 int prec = TYPE_PRECISION (type0);
8811 (if (prec <= MAX_FIXED_MODE_SIZE)
8812 (if (tree_int_cst_sgn (@1) < 0 || wi::to_widest (@1) >= prec)
8813 (if (zero_val != wi::to_widest (@1))
8814 { constant_boolean_node (op == EQ_EXPR ? false : true, type); })
8815 (if (zero_val < 0 || zero_val >= prec)
8816 (op (bit_and @0 { wide_int_to_tree (type0,
8817 wi::mask (tree_to_uhwi (@1) + 1,
8819 { wide_int_to_tree (type0,
8820 wi::shifted_mask (tree_to_uhwi (@1), 1,
8821 false, prec)); })))))))
8824 /* ctz(ext(X)) == ctz(X). Valid just for the UB at zero cases though. */
8826 (CTZ (convert@1 @0))
8827 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
8828 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
8829 && TYPE_PRECISION (TREE_TYPE (@1)) > TYPE_PRECISION (TREE_TYPE (@0)))
8830 (with { combined_fn cfn = CFN_LAST;
8831 tree type0 = TREE_TYPE (@0);
8832 if (TREE_CODE (type0) == BITINT_TYPE)
8834 if (TYPE_PRECISION (type0) > MAX_FIXED_MODE_SIZE)
8838 = build_nonstandard_integer_type (TYPE_PRECISION (type0),
8841 type0 = unsigned_type_for (type0);
8843 && direct_internal_fn_supported_p (IFN_CTZ, type0,
8847 && TYPE_PRECISION (TREE_TYPE (@1)) > BITS_PER_WORD
8848 && !direct_internal_fn_supported_p (IFN_CTZ,
8852 if (TYPE_PRECISION (type0)
8853 == TYPE_PRECISION (unsigned_type_node))
8854 cfn = CFN_BUILT_IN_CTZ;
8855 else if (TYPE_PRECISION (type0)
8856 == TYPE_PRECISION (long_long_unsigned_type_node))
8857 cfn = CFN_BUILT_IN_CTZLL;
8859 (if (cfn == CFN_CTZ)
8860 (IFN_CTZ (convert:type0 @0))
8861 (if (cfn == CFN_BUILT_IN_CTZ)
8862 (BUILT_IN_CTZ (convert:type0 @0))
8863 (if (cfn == CFN_BUILT_IN_CTZLL)
8864 (BUILT_IN_CTZLL (convert:type0 @0))))))))
8867 /* POPCOUNT simplifications. */
8868 /* popcount(X) + popcount(Y) is popcount(X|Y) when X&Y must be zero. */
8870 (plus (POPCOUNT:s @0) (POPCOUNT:s @1))
8871 (if (INTEGRAL_TYPE_P (type)
8872 && (wi::bit_and (widest_int::from (tree_nonzero_bits (@0), UNSIGNED),
8873 widest_int::from (tree_nonzero_bits (@1), UNSIGNED))
8875 (with { tree utype = TREE_TYPE (@0);
8876 if (TYPE_PRECISION (utype) < TYPE_PRECISION (TREE_TYPE (@1)))
8877 utype = TREE_TYPE (@1); }
8878 (POPCOUNT (bit_ior (convert:utype @0) (convert:utype @1))))))
8880 /* popcount(X) == 0 is X == 0, and related (in)equalities. */
8881 (for popcount (POPCOUNT)
8882 (for cmp (le eq ne gt)
8885 (cmp (popcount @0) integer_zerop)
8886 (rep @0 { build_zero_cst (TREE_TYPE (@0)); }))))
8888 /* popcount(bswap(x)) is popcount(x). */
8889 (for popcount (POPCOUNT)
8890 (for bswap (BUILT_IN_BSWAP16 BUILT_IN_BSWAP32
8891 BUILT_IN_BSWAP64 BUILT_IN_BSWAP128)
8893 (popcount (convert?@0 (bswap:s@1 @2)))
8894 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
8895 && INTEGRAL_TYPE_P (TREE_TYPE (@1)))
8896 (with { tree type0 = TREE_TYPE (@0);
8897 tree type1 = TREE_TYPE (@1);
8898 unsigned int prec0 = TYPE_PRECISION (type0);
8899 unsigned int prec1 = TYPE_PRECISION (type1); }
8900 (if (prec0 == prec1 || (prec0 > prec1 && TYPE_UNSIGNED (type1)))
8901 (popcount (convert:type0 (convert:type1 @2)))))))))
8903 /* popcount(rotate(X Y)) is popcount(X). */
8904 (for popcount (POPCOUNT)
8905 (for rot (lrotate rrotate)
8907 (popcount (convert?@0 (rot:s@1 @2 @3)))
8908 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
8909 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
8910 && (GIMPLE || !TREE_SIDE_EFFECTS (@3)))
8911 (with { tree type0 = TREE_TYPE (@0);
8912 tree type1 = TREE_TYPE (@1);
8913 unsigned int prec0 = TYPE_PRECISION (type0);
8914 unsigned int prec1 = TYPE_PRECISION (type1); }
8915 (if (prec0 == prec1 || (prec0 > prec1 && TYPE_UNSIGNED (type1)))
8916 (popcount (convert:type0 @2))))))))
8918 /* Canonicalize POPCOUNT(x)&1 as PARITY(X). */
8920 (bit_and (POPCOUNT @0) integer_onep)
8923 /* popcount(X&Y) + popcount(X|Y) is popcount(x) + popcount(Y). */
8925 (plus:c (POPCOUNT:s (bit_and:s @0 @1)) (POPCOUNT:s (bit_ior:cs @0 @1)))
8926 (plus (POPCOUNT:type @0) (POPCOUNT:type @1)))
8928 /* popcount(X) + popcount(Y) - popcount(X&Y) is popcount(X|Y). */
8929 /* popcount(X) + popcount(Y) - popcount(X|Y) is popcount(X&Y). */
8930 (for popcount (POPCOUNT)
8931 (for log1 (bit_and bit_ior)
8932 log2 (bit_ior bit_and)
8934 (minus (plus:s (popcount:s @0) (popcount:s @1))
8935 (popcount:s (log1:cs @0 @1)))
8936 (popcount (log2 @0 @1)))
8938 (plus:c (minus:s (popcount:s @0) (popcount:s (log1:cs @0 @1)))
8940 (popcount (log2 @0 @1)))))
8943 /* popcount(zext(X)) == popcount(X). */
8945 (POPCOUNT (convert@1 @0))
8946 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
8947 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
8948 && TYPE_UNSIGNED (TREE_TYPE (@0))
8949 && TYPE_PRECISION (TREE_TYPE (@1)) > TYPE_PRECISION (TREE_TYPE (@0)))
8950 (with { combined_fn cfn = CFN_LAST;
8951 tree type0 = TREE_TYPE (@0);
8952 if (TREE_CODE (type0) == BITINT_TYPE)
8954 if (TYPE_PRECISION (type0) > MAX_FIXED_MODE_SIZE)
8958 = build_nonstandard_integer_type (TYPE_PRECISION (type0),
8962 && direct_internal_fn_supported_p (IFN_POPCOUNT, type0,
8966 && TYPE_PRECISION (TREE_TYPE (@1)) > BITS_PER_WORD
8967 && !direct_internal_fn_supported_p (IFN_POPCOUNT,
8971 if (TYPE_PRECISION (type0)
8972 == TYPE_PRECISION (unsigned_type_node))
8973 cfn = CFN_BUILT_IN_POPCOUNT;
8974 else if (TYPE_PRECISION (type0)
8975 == TYPE_PRECISION (long_long_unsigned_type_node))
8976 cfn = CFN_BUILT_IN_POPCOUNTLL;
8978 (if (cfn == CFN_POPCOUNT)
8979 (IFN_POPCOUNT (convert:type0 @0))
8980 (if (cfn == CFN_BUILT_IN_POPCOUNT)
8981 (BUILT_IN_POPCOUNT (convert:type0 @0))
8982 (if (cfn == CFN_BUILT_IN_POPCOUNTLL)
8983 (BUILT_IN_POPCOUNTLL (convert:type0 @0))))))))
8986 /* PARITY simplifications. */
8987 /* parity(~X) is parity(X). */
8989 (PARITY (bit_not @0))
8992 /* parity(bswap(x)) is parity(x). */
8993 (for parity (PARITY)
8994 (for bswap (BUILT_IN_BSWAP16 BUILT_IN_BSWAP32
8995 BUILT_IN_BSWAP64 BUILT_IN_BSWAP128)
8997 (parity (convert?@0 (bswap:s@1 @2)))
8998 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
8999 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
9000 && TYPE_PRECISION (TREE_TYPE (@0))
9001 >= TYPE_PRECISION (TREE_TYPE (@1)))
9002 (with { tree type0 = TREE_TYPE (@0);
9003 tree type1 = TREE_TYPE (@1); }
9004 (parity (convert:type0 (convert:type1 @2))))))))
9006 /* parity(rotate(X Y)) is parity(X). */
9007 (for parity (PARITY)
9008 (for rot (lrotate rrotate)
9010 (parity (convert?@0 (rot:s@1 @2 @3)))
9011 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
9012 && INTEGRAL_TYPE_P (TREE_TYPE (@1))
9013 && (GIMPLE || !TREE_SIDE_EFFECTS (@3))
9014 && TYPE_PRECISION (TREE_TYPE (@0))
9015 >= TYPE_PRECISION (TREE_TYPE (@1)))
9016 (with { tree type0 = TREE_TYPE (@0); }
9017 (parity (convert:type0 @2)))))))
9019 /* parity(X)^parity(Y) is parity(X^Y). */
9021 (bit_xor (PARITY:s @0) (PARITY:s @1))
9022 (if (types_match (TREE_TYPE (@0), TREE_TYPE (@1)))
9023 (PARITY (bit_xor @0 @1))
9024 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
9025 && INTEGRAL_TYPE_P (TREE_TYPE (@1)))
9026 (with { tree utype = TREE_TYPE (@0);
9027 if (TYPE_PRECISION (utype) < TYPE_PRECISION (TREE_TYPE (@1)))
9028 utype = TREE_TYPE (@1); }
9029 (PARITY (bit_xor (convert:utype @0) (convert:utype @1)))))))
9032 /* parity(zext(X)) == parity(X). */
9033 /* parity(sext(X)) == parity(X) if the difference in precision is even. */
9035 (PARITY (convert@1 @0))
9036 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
9037 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
9038 && TYPE_PRECISION (TREE_TYPE (@1)) > TYPE_PRECISION (TREE_TYPE (@0))
9039 && (TYPE_UNSIGNED (TREE_TYPE (@0))
9040 || ((TYPE_PRECISION (TREE_TYPE (@1))
9041 - TYPE_PRECISION (TREE_TYPE (@0))) & 1) == 0))
9042 (with { combined_fn cfn = CFN_LAST;
9043 tree type0 = TREE_TYPE (@0);
9044 if (TREE_CODE (type0) == BITINT_TYPE)
9046 if (TYPE_PRECISION (type0) > MAX_FIXED_MODE_SIZE)
9050 = build_nonstandard_integer_type (TYPE_PRECISION (type0),
9053 type0 = unsigned_type_for (type0);
9055 && direct_internal_fn_supported_p (IFN_PARITY, type0,
9059 && TYPE_PRECISION (TREE_TYPE (@1)) > BITS_PER_WORD
9060 && !direct_internal_fn_supported_p (IFN_PARITY,
9064 if (TYPE_PRECISION (type0)
9065 == TYPE_PRECISION (unsigned_type_node))
9066 cfn = CFN_BUILT_IN_PARITY;
9067 else if (TYPE_PRECISION (type0)
9068 == TYPE_PRECISION (long_long_unsigned_type_node))
9069 cfn = CFN_BUILT_IN_PARITYLL;
9071 (if (cfn == CFN_PARITY)
9072 (IFN_PARITY (convert:type0 @0))
9073 (if (cfn == CFN_BUILT_IN_PARITY)
9074 (BUILT_IN_PARITY (convert:type0 @0))
9075 (if (cfn == CFN_BUILT_IN_PARITYLL)
9076 (BUILT_IN_PARITYLL (convert:type0 @0))))))))
9079 /* a != 0 ? FUN(a) : 0 -> Fun(a) for some builtin functions. */
9080 (for func (POPCOUNT BSWAP FFS PARITY)
9082 (cond (ne @0 integer_zerop@1) (func@3 (convert? @0)) integer_zerop@2)
9085 /* a != 0 ? FUN(a) : CST -> Fun(a) for some CLRSB builtins
9086 where CST is precision-1. */
9089 (cond (ne @0 integer_zerop@1) (func@4 (convert?@3 @0)) INTEGER_CST@2)
9090 (if (wi::to_widest (@2) == TYPE_PRECISION (TREE_TYPE (@3)) - 1)
9094 /* a != 0 ? CLZ(a) : CST -> .CLZ(a) where CST is the result of the internal function for 0. */
9097 (cond (ne @0 integer_zerop@1) (func (convert?@3 @0)) INTEGER_CST@2)
9099 internal_fn ifn = IFN_LAST;
9100 if (TREE_CODE (TREE_TYPE (@3)) == BITINT_TYPE)
9102 if (tree_fits_shwi_p (@2))
9104 HOST_WIDE_INT valw = tree_to_shwi (@2);
9105 if ((int) valw == valw)
9112 else if (direct_internal_fn_supported_p (IFN_CLZ, TREE_TYPE (@3),
9114 && CLZ_DEFINED_VALUE_AT_ZERO
9115 (SCALAR_INT_TYPE_MODE (TREE_TYPE (@3)), val) == 2)
9118 (if (ifn == IFN_CLZ && wi::to_widest (@2) == val)
9121 (cond (ne @0 integer_zerop@1) (IFN_CLZ (convert?@3 @0) INTEGER_CST@2) @2)
9123 internal_fn ifn = IFN_LAST;
9124 if (TREE_CODE (TREE_TYPE (@3)) == BITINT_TYPE)
9126 else if (direct_internal_fn_supported_p (IFN_CLZ, TREE_TYPE (@3),
9130 (if (ifn == IFN_CLZ)
9133 /* a != 0 ? CTZ(a) : CST -> .CTZ(a) where CST is the result of the internal function for 0. */
9136 (cond (ne @0 integer_zerop@1) (func (convert?@3 @0)) INTEGER_CST@2)
9138 internal_fn ifn = IFN_LAST;
9139 if (TREE_CODE (TREE_TYPE (@3)) == BITINT_TYPE)
9141 if (tree_fits_shwi_p (@2))
9143 HOST_WIDE_INT valw = tree_to_shwi (@2);
9144 if ((int) valw == valw)
9151 else if (direct_internal_fn_supported_p (IFN_CTZ, TREE_TYPE (@3),
9153 && CTZ_DEFINED_VALUE_AT_ZERO
9154 (SCALAR_INT_TYPE_MODE (TREE_TYPE (@3)), val) == 2)
9157 (if (ifn == IFN_CTZ && wi::to_widest (@2) == val)
9160 (cond (ne @0 integer_zerop@1) (IFN_CTZ (convert?@3 @0) INTEGER_CST@2) @2)
9162 internal_fn ifn = IFN_LAST;
9163 if (TREE_CODE (TREE_TYPE (@3)) == BITINT_TYPE)
9165 else if (direct_internal_fn_supported_p (IFN_CTZ, TREE_TYPE (@3),
9169 (if (ifn == IFN_CTZ)
9173 /* Common POPCOUNT/PARITY simplifications. */
9174 /* popcount(X&C1) is (X>>C2)&1 when C1 == 1<<C2. Same for parity(X&C1). */
9175 (for pfun (POPCOUNT PARITY)
9178 (if (INTEGRAL_TYPE_P (type))
9179 (with { wide_int nz = tree_nonzero_bits (@0); }
9183 (if (wi::popcount (nz) == 1)
9184 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
9185 (convert (rshift:utype (convert:utype @0)
9186 { build_int_cst (integer_type_node,
9187 wi::ctz (nz)); })))))))))
9190 /* 64- and 32-bits branchless implementations of popcount are detected:
9192 int popcount64c (uint64_t x)
9194 x -= (x >> 1) & 0x5555555555555555ULL;
9195 x = (x & 0x3333333333333333ULL) + ((x >> 2) & 0x3333333333333333ULL);
9196 x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
9197 return (x * 0x0101010101010101ULL) >> 56;
9200 int popcount32c (uint32_t x)
9202 x -= (x >> 1) & 0x55555555;
9203 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
9204 x = (x + (x >> 4)) & 0x0f0f0f0f;
9205 return (x * 0x01010101) >> 24;
9212 (rshift @8 INTEGER_CST@5)
9214 (bit_and @6 INTEGER_CST@7)
9218 (bit_and (rshift @0 INTEGER_CST@4) INTEGER_CST@11))
9224 /* Check constants and optab. */
9225 (with { unsigned prec = TYPE_PRECISION (type);
9226 int shift = (64 - prec) & 63;
9227 unsigned HOST_WIDE_INT c1
9228 = HOST_WIDE_INT_UC (0x0101010101010101) >> shift;
9229 unsigned HOST_WIDE_INT c2
9230 = HOST_WIDE_INT_UC (0x0F0F0F0F0F0F0F0F) >> shift;
9231 unsigned HOST_WIDE_INT c3
9232 = HOST_WIDE_INT_UC (0x3333333333333333) >> shift;
9233 unsigned HOST_WIDE_INT c4
9234 = HOST_WIDE_INT_UC (0x5555555555555555) >> shift;
9239 && TYPE_UNSIGNED (type)
9240 && integer_onep (@4)
9241 && wi::to_widest (@10) == 2
9242 && wi::to_widest (@5) == 4
9243 && wi::to_widest (@1) == prec - 8
9244 && tree_to_uhwi (@2) == c1
9245 && tree_to_uhwi (@3) == c2
9246 && tree_to_uhwi (@9) == c3
9247 && tree_to_uhwi (@7) == c3
9248 && tree_to_uhwi (@11) == c4)
9249 (if (direct_internal_fn_supported_p (IFN_POPCOUNT, type,
9251 (convert (IFN_POPCOUNT:type @0))
9252 /* Try to do popcount in two halves. PREC must be at least
9253 five bits for this to work without extension before adding. */
9255 tree half_type = NULL_TREE;
9256 opt_machine_mode m = mode_for_size ((prec + 1) / 2, MODE_INT, 1);
9259 && m.require () != TYPE_MODE (type))
9261 half_prec = GET_MODE_PRECISION (as_a <scalar_int_mode> (m));
9262 half_type = build_nonstandard_integer_type (half_prec, 1);
9264 gcc_assert (half_prec > 2);
9266 (if (half_type != NULL_TREE
9267 && direct_internal_fn_supported_p (IFN_POPCOUNT, half_type,
9270 (IFN_POPCOUNT:half_type (convert @0))
9271 (IFN_POPCOUNT:half_type (convert (rshift @0
9272 { build_int_cst (integer_type_node, half_prec); } )))))))))))
9274 /* __builtin_ffs needs to deal on many targets with the possible zero
9275 argument. If we know the argument is always non-zero, __builtin_ctz + 1
9276 should lead to better code. */
9278 (FFS tree_expr_nonzero_p@0)
9279 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
9280 && direct_internal_fn_supported_p (IFN_CTZ, TREE_TYPE (@0),
9281 OPTIMIZE_FOR_SPEED))
9282 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
9283 (plus (CTZ:type (convert:utype @0)) { build_one_cst (type); }))))
9287 /* __builtin_ffs (X) == 0 -> X == 0.
9288 __builtin_ffs (X) == 6 -> (X & 63) == 32. */
9291 (cmp (ffs@2 @0) INTEGER_CST@1)
9292 (with { int prec = TYPE_PRECISION (TREE_TYPE (@0)); }
9294 (if (integer_zerop (@1))
9295 (cmp @0 { build_zero_cst (TREE_TYPE (@0)); }))
9296 (if (tree_int_cst_sgn (@1) < 0 || wi::to_widest (@1) > prec)
9297 { constant_boolean_node (cmp == NE_EXPR ? true : false, type); })
9298 (if (single_use (@2))
9299 (cmp (bit_and @0 { wide_int_to_tree (TREE_TYPE (@0),
9300 wi::mask (tree_to_uhwi (@1),
9302 { wide_int_to_tree (TREE_TYPE (@0),
9303 wi::shifted_mask (tree_to_uhwi (@1) - 1, 1,
9304 false, prec)); }))))))
9306 /* __builtin_ffs (X) > 6 -> X != 0 && (X & 63) == 0. */
9310 bit_op (bit_and bit_ior)
9312 (cmp (ffs@2 @0) INTEGER_CST@1)
9313 (with { int prec = TYPE_PRECISION (TREE_TYPE (@0)); }
9315 (if (integer_zerop (@1))
9316 (cmp2 @0 { build_zero_cst (TREE_TYPE (@0)); }))
9317 (if (tree_int_cst_sgn (@1) < 0)
9318 { constant_boolean_node (cmp == GT_EXPR ? true : false, type); })
9319 (if (wi::to_widest (@1) >= prec)
9320 { constant_boolean_node (cmp == GT_EXPR ? false : true, type); })
9321 (if (wi::to_widest (@1) == prec - 1)
9322 (cmp3 @0 { wide_int_to_tree (TREE_TYPE (@0),
9323 wi::shifted_mask (prec - 1, 1,
9325 (if (single_use (@2))
9326 (bit_op (cmp2 @0 { build_zero_cst (TREE_TYPE (@0)); })
9328 { wide_int_to_tree (TREE_TYPE (@0),
9329 wi::mask (tree_to_uhwi (@1),
9331 { build_zero_cst (TREE_TYPE (@0)); }))))))))
9334 /* ffs(ext(X)) == ffs(X). */
9336 (FFS (convert@1 @0))
9337 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
9338 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
9339 && TYPE_PRECISION (TREE_TYPE (@1)) > TYPE_PRECISION (TREE_TYPE (@0)))
9340 (with { combined_fn cfn = CFN_LAST;
9341 tree type0 = TREE_TYPE (@0);
9342 if (TREE_CODE (type0) == BITINT_TYPE)
9344 if (TYPE_PRECISION (type0) > MAX_FIXED_MODE_SIZE)
9348 = build_nonstandard_integer_type (TYPE_PRECISION (type0),
9351 type0 = signed_type_for (type0);
9353 && direct_internal_fn_supported_p (IFN_FFS, type0,
9357 && TYPE_PRECISION (TREE_TYPE (@1)) > BITS_PER_WORD
9358 && !direct_internal_fn_supported_p (IFN_FFS,
9362 if (TYPE_PRECISION (type0)
9363 == TYPE_PRECISION (integer_type_node))
9364 cfn = CFN_BUILT_IN_FFS;
9365 else if (TYPE_PRECISION (type0)
9366 == TYPE_PRECISION (long_long_integer_type_node))
9367 cfn = CFN_BUILT_IN_FFSLL;
9369 (if (cfn == CFN_FFS)
9370 (IFN_FFS (convert:type0 @0))
9371 (if (cfn == CFN_BUILT_IN_FFS)
9372 (BUILT_IN_FFS (convert:type0 @0))
9373 (if (cfn == CFN_BUILT_IN_FFSLL)
9374 (BUILT_IN_FFSLL (convert:type0 @0))))))))
9382 --> r = .COND_FN (cond, a, b)
9386 --> r = .COND_FN (~cond, b, a). */
9388 (for uncond_op (UNCOND_UNARY)
9389 cond_op (COND_UNARY)
9391 (vec_cond @0 (view_convert? (uncond_op@3 @1)) @2)
9392 (with { tree op_type = TREE_TYPE (@3); }
9393 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9394 && is_truth_type_for (op_type, TREE_TYPE (@0)))
9395 (cond_op @0 (view_convert @1) @2))))
9397 (vec_cond @0 @1 (view_convert? (uncond_op@3 @2)))
9398 (with { tree op_type = TREE_TYPE (@3); }
9399 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9400 && is_truth_type_for (op_type, TREE_TYPE (@0)))
9401 (cond_op (bit_not @0) (view_convert @2) @1)))))
9403 (for uncond_op (UNCOND_UNARY)
9404 cond_op (COND_LEN_UNARY)
9406 (IFN_VCOND_MASK_LEN @0 (view_convert? (uncond_op@3 @1)) @2 @4 @5)
9407 (with { tree op_type = TREE_TYPE (@3); }
9408 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9409 && is_truth_type_for (op_type, TREE_TYPE (@0)))
9410 (cond_op @0 (view_convert @1) @2 @4 @5))))
9412 (IFN_VCOND_MASK_LEN @0 @1 (view_convert? (uncond_op@3 @2)) @4 @5)
9413 (with { tree op_type = TREE_TYPE (@3); }
9414 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9415 && is_truth_type_for (op_type, TREE_TYPE (@0)))
9416 (cond_op (bit_not @0) (view_convert @2) @1 @4 @5)))))
9418 /* `(a ? -1 : 0) ^ b` can be converted into a conditional not. */
9420 (bit_xor:c (vec_cond @0 uniform_integer_cst_p@1 uniform_integer_cst_p@2) @3)
9421 (if (canonicalize_math_after_vectorization_p ()
9422 && vectorized_internal_fn_supported_p (IFN_COND_NOT, type)
9423 && is_truth_type_for (type, TREE_TYPE (@0)))
9424 (if (integer_all_onesp (@1) && integer_zerop (@2))
9425 (IFN_COND_NOT @0 @3 @3))
9426 (if (integer_all_onesp (@2) && integer_zerop (@1))
9427 (IFN_COND_NOT (bit_not @0) @3 @3))))
9436 r = c ? a1 op a2 : b;
9438 if the target can do it in one go. This makes the operation conditional
9439 on c, so could drop potentially-trapping arithmetic, but that's a valid
9440 simplification if the result of the operation isn't needed.
9442 Avoid speculatively generating a stand-alone vector comparison
9443 on targets that might not support them. Any target implementing
9444 conditional internal functions must support the same comparisons
9445 inside and outside a VEC_COND_EXPR. */
9447 (for uncond_op (UNCOND_BINARY)
9448 cond_op (COND_BINARY)
9450 (vec_cond @0 (view_convert? (uncond_op@4 @1 @2)) @3)
9451 (with { tree op_type = TREE_TYPE (@4); }
9452 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9453 && is_truth_type_for (op_type, TREE_TYPE (@0))
9455 (view_convert (cond_op @0 @1 @2 (view_convert:op_type @3))))))
9457 (vec_cond @0 @1 (view_convert? (uncond_op@4 @2 @3)))
9458 (with { tree op_type = TREE_TYPE (@4); }
9459 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9460 && is_truth_type_for (op_type, TREE_TYPE (@0))
9462 (view_convert (cond_op (bit_not @0) @2 @3 (view_convert:op_type @1)))))))
9464 (for uncond_op (UNCOND_BINARY)
9465 cond_op (COND_LEN_BINARY)
9467 (IFN_VCOND_MASK_LEN @0 (view_convert? (uncond_op@4 @1 @2)) @3 @5 @6)
9468 (with { tree op_type = TREE_TYPE (@4); }
9469 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9470 && is_truth_type_for (op_type, TREE_TYPE (@0))
9472 (view_convert (cond_op @0 @1 @2 (view_convert:op_type @3) @5 @6)))))
9474 (IFN_VCOND_MASK_LEN @0 @1 (view_convert? (uncond_op@4 @2 @3)) @5 @6)
9475 (with { tree op_type = TREE_TYPE (@4); }
9476 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9477 && is_truth_type_for (op_type, TREE_TYPE (@0))
9479 (view_convert (cond_op (bit_not @0) @2 @3 (view_convert:op_type @1) @5 @6))))))
9481 /* Same for ternary operations. */
9482 (for uncond_op (UNCOND_TERNARY)
9483 cond_op (COND_TERNARY)
9485 (vec_cond @0 (view_convert? (uncond_op@5 @1 @2 @3)) @4)
9486 (with { tree op_type = TREE_TYPE (@5); }
9487 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9488 && is_truth_type_for (op_type, TREE_TYPE (@0))
9490 (view_convert (cond_op @0 @1 @2 @3 (view_convert:op_type @4))))))
9492 (vec_cond @0 @1 (view_convert? (uncond_op@5 @2 @3 @4)))
9493 (with { tree op_type = TREE_TYPE (@5); }
9494 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9495 && is_truth_type_for (op_type, TREE_TYPE (@0))
9497 (view_convert (cond_op (bit_not @0) @2 @3 @4
9498 (view_convert:op_type @1)))))))
9500 (for uncond_op (UNCOND_TERNARY)
9501 cond_op (COND_LEN_TERNARY)
9503 (IFN_VCOND_MASK_LEN @0 (view_convert? (uncond_op@5 @1 @2 @3)) @4 @6 @7)
9504 (with { tree op_type = TREE_TYPE (@5); }
9505 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9506 && is_truth_type_for (op_type, TREE_TYPE (@0))
9508 (view_convert (cond_op @0 @1 @2 @3 (view_convert:op_type @4) @6 @7)))))
9510 (IFN_VCOND_MASK_LEN @0 @1 (view_convert? (uncond_op@5 @2 @3 @4 @6 @7)))
9511 (with { tree op_type = TREE_TYPE (@5); }
9512 (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
9513 && is_truth_type_for (op_type, TREE_TYPE (@0))
9515 (view_convert (cond_op (bit_not @0) @2 @3 @4 (view_convert:op_type @1) @6 @7))))))
9518 /* Detect cases in which a VEC_COND_EXPR effectively replaces the
9519 "else" value of an IFN_COND_*. */
9520 (for cond_op (COND_BINARY)
9522 (vec_cond @0 (view_convert? (cond_op @0 @1 @2 @3)) @4)
9523 (with { tree op_type = TREE_TYPE (@3); }
9524 (if (element_precision (type) == element_precision (op_type))
9525 (view_convert (cond_op @0 @1 @2 (view_convert:op_type @4))))))
9527 (vec_cond @0 @1 (view_convert? (cond_op @2 @3 @4 @5)))
9528 (with { tree op_type = TREE_TYPE (@5); }
9529 (if (inverse_conditions_p (@0, @2)
9530 && element_precision (type) == element_precision (op_type))
9531 (view_convert (cond_op @2 @3 @4 (view_convert:op_type @1)))))))
9533 /* Same for ternary operations. */
9534 (for cond_op (COND_TERNARY)
9536 (vec_cond @0 (view_convert? (cond_op @0 @1 @2 @3 @4)) @5)
9537 (with { tree op_type = TREE_TYPE (@4); }
9538 (if (element_precision (type) == element_precision (op_type))
9539 (view_convert (cond_op @0 @1 @2 @3 (view_convert:op_type @5))))))
9541 (vec_cond @0 @1 (view_convert? (cond_op @2 @3 @4 @5 @6)))
9542 (with { tree op_type = TREE_TYPE (@6); }
9543 (if (inverse_conditions_p (@0, @2)
9544 && element_precision (type) == element_precision (op_type))
9545 (view_convert (cond_op @2 @3 @4 @5 (view_convert:op_type @1)))))))
9547 /* Detect cases in which a VEC_COND_EXPR effectively replaces the
9548 "else" value of an IFN_COND_LEN_*. */
9549 (for cond_len_op (COND_LEN_BINARY)
9551 (vec_cond @0 (view_convert? (cond_len_op @0 @1 @2 @3 @4 @5)) @6)
9552 (with { tree op_type = TREE_TYPE (@3); }
9553 (if (element_precision (type) == element_precision (op_type))
9554 (view_convert (cond_len_op @0 @1 @2 (view_convert:op_type @6) @4 @5)))))
9556 (vec_cond @0 @1 (view_convert? (cond_len_op @2 @3 @4 @5 @6 @7)))
9557 (with { tree op_type = TREE_TYPE (@5); }
9558 (if (inverse_conditions_p (@0, @2)
9559 && element_precision (type) == element_precision (op_type))
9560 (view_convert (cond_len_op @2 @3 @4 (view_convert:op_type @1) @6 @7))))))
9562 /* Same for ternary operations. */
9563 (for cond_len_op (COND_LEN_TERNARY)
9565 (vec_cond @0 (view_convert? (cond_len_op @0 @1 @2 @3 @4 @5 @6)) @7)
9566 (with { tree op_type = TREE_TYPE (@4); }
9567 (if (element_precision (type) == element_precision (op_type))
9568 (view_convert (cond_len_op @0 @1 @2 @3 (view_convert:op_type @7) @5 @6)))))
9570 (vec_cond @0 @1 (view_convert? (cond_len_op @2 @3 @4 @5 @6 @7 @8)))
9571 (with { tree op_type = TREE_TYPE (@6); }
9572 (if (inverse_conditions_p (@0, @2)
9573 && element_precision (type) == element_precision (op_type))
9574 (view_convert (cond_len_op @2 @3 @4 @5 (view_convert:op_type @1) @7 @8))))))
9576 /* Detect simplication for a conditional reduction where
9579 c = mask2 ? d + a : d
9583 c = mask1 && mask2 ? d + b : d. */
9585 (IFN_COND_ADD @0 @1 (vec_cond @2 @3 zerop@4) @1)
9586 (if (ANY_INTEGRAL_TYPE_P (type)
9587 || (FLOAT_TYPE_P (type)
9588 && fold_real_zero_addition_p (type, NULL_TREE, @4, 0)))
9589 (IFN_COND_ADD (bit_and @0 @2) @1 @3 @1)))
9591 /* Detect simplication for a conditional length reduction where
9594 c = i < len + bias ? d + a : d
9598 c = mask && i < len + bias ? d + b : d. */
9600 (IFN_COND_LEN_ADD integer_truep @0 (vec_cond @1 @2 zerop@5) @0 @3 @4)
9601 (if (ANY_INTEGRAL_TYPE_P (type)
9602 || (FLOAT_TYPE_P (type)
9603 && fold_real_zero_addition_p (type, NULL_TREE, @5, 0)))
9604 (IFN_COND_LEN_ADD @1 @0 @2 @0 @3 @4)))
9606 /* Detect simplification for vector condition folding where
9608 c = mask1 ? (masked_op mask2 a b els) : els
9612 c = masked_op (mask1 & mask2) a b els
9614 where the operation can be partially applied to one operand. */
9616 (for cond_op (COND_BINARY)
9619 (cond_op:s @1 @2 @3 @4) @4)
9620 (cond_op (bit_and @1 @0) @2 @3 @4)))
9622 /* And same for ternary expressions. */
9624 (for cond_op (COND_TERNARY)
9627 (cond_op:s @1 @2 @3 @4 @5) @5)
9628 (cond_op (bit_and @1 @0) @2 @3 @4 @5)))
9630 /* For pointers @0 and @2 and nonnegative constant offset @1, look for
9633 A: (@0 + @1 < @2) | (@2 + @1 < @0)
9634 B: (@0 + @1 <= @2) | (@2 + @1 <= @0)
9636 If pointers are known not to wrap, B checks whether @1 bytes starting
9637 at @0 and @2 do not overlap, while A tests the same thing for @1 + 1
9638 bytes. A is more efficiently tested as:
9640 A: (sizetype) (@0 + @1 - @2) > @1 * 2
9642 The equivalent expression for B is given by replacing @1 with @1 - 1:
9644 B: (sizetype) (@0 + (@1 - 1) - @2) > (@1 - 1) * 2
9646 @0 and @2 can be swapped in both expressions without changing the result.
9648 The folds rely on sizetype's being unsigned (which is always true)
9649 and on its being the same width as the pointer (which we have to check).
9651 The fold replaces two pointer_plus expressions, two comparisons and
9652 an IOR with a pointer_plus, a pointer_diff, and a comparison, so in
9653 the best case it's a saving of two operations. The A fold retains one
9654 of the original pointer_pluses, so is a win even if both pointer_pluses
9655 are used elsewhere. The B fold is a wash if both pointer_pluses are
9656 used elsewhere, since all we end up doing is replacing a comparison with
9657 a pointer_plus. We do still apply the fold under those circumstances
9658 though, in case applying it to other conditions eventually makes one of the
9659 pointer_pluses dead. */
9660 (for ior (truth_orif truth_or bit_ior)
9663 (ior (cmp:cs (pointer_plus@3 @0 INTEGER_CST@1) @2)
9664 (cmp:cs (pointer_plus@4 @2 @1) @0))
9665 (if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
9666 && TYPE_OVERFLOW_WRAPS (sizetype)
9667 && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (sizetype))
9668 /* Calculate the rhs constant. */
9669 (with { offset_int off = wi::to_offset (@1) - (cmp == LE_EXPR ? 1 : 0);
9670 offset_int rhs = off * 2; }
9671 /* Always fails for negative values. */
9672 (if (wi::min_precision (rhs, UNSIGNED) <= TYPE_PRECISION (sizetype))
9673 /* Since the order of @0 and @2 doesn't matter, let tree_swap_operands_p
9674 pick a canonical order. This increases the chances of using the
9675 same pointer_plus in multiple checks. */
9676 (with { bool swap_p = tree_swap_operands_p (@0, @2);
9677 tree rhs_tree = wide_int_to_tree (sizetype, rhs); }
9678 (if (cmp == LT_EXPR)
9679 (gt (convert:sizetype
9680 (pointer_diff:ssizetype { swap_p ? @4 : @3; }
9681 { swap_p ? @0 : @2; }))
9683 (gt (convert:sizetype
9684 (pointer_diff:ssizetype
9685 (pointer_plus { swap_p ? @2 : @0; }
9686 { wide_int_to_tree (sizetype, off); })
9687 { swap_p ? @0 : @2; }))
9688 { rhs_tree; })))))))))
9690 /* Fold REDUC (@0 & @1) -> @0[I] & @1[I] if element I is the only nonzero
9692 (for reduc (IFN_REDUC_PLUS IFN_REDUC_IOR IFN_REDUC_XOR)
9693 (simplify (reduc (view_convert? (bit_and @0 VECTOR_CST@1)))
9694 (with { int i = single_nonzero_element (@1); }
9696 (with { tree elt = vector_cst_elt (@1, i);
9697 tree elt_type = TREE_TYPE (elt);
9698 unsigned int elt_bits = tree_to_uhwi (TYPE_SIZE (elt_type));
9699 tree size = bitsize_int (elt_bits);
9700 tree pos = bitsize_int (elt_bits * i); }
9703 (BIT_FIELD_REF:elt_type @0 { size; } { pos; })
9706 /* Fold reduction of a single nonzero element constructor. */
9707 (for reduc (IFN_REDUC_PLUS IFN_REDUC_IOR IFN_REDUC_XOR)
9708 (simplify (reduc (CONSTRUCTOR@0))
9709 (with { tree ctor = (TREE_CODE (@0) == SSA_NAME
9710 ? gimple_assign_rhs1 (SSA_NAME_DEF_STMT (@0)) : @0);
9711 tree elt = ctor_single_nonzero_element (ctor); }
9713 && !HONOR_SNANS (type)
9714 && !HONOR_SIGNED_ZEROS (type))
9717 /* Fold REDUC (@0 op VECTOR_CST) as REDUC (@0) op REDUC (VECTOR_CST). */
9718 (for reduc (IFN_REDUC_PLUS IFN_REDUC_MAX IFN_REDUC_MIN IFN_REDUC_FMAX
9719 IFN_REDUC_FMIN IFN_REDUC_AND IFN_REDUC_IOR IFN_REDUC_XOR)
9720 op (plus max min IFN_FMAX IFN_FMIN bit_and bit_ior bit_xor)
9721 (simplify (reduc (op @0 VECTOR_CST@1))
9722 (op (reduc:type @0) (reduc:type @1))))
9724 /* Simplify vector floating point operations of alternating sub/add pairs
9725 into using an fneg of a wider element type followed by a normal add.
9726 under IEEE 754 the fneg of the wider type will negate every even entry
9727 and when doing an add we get a sub of the even and add of every odd
9729 (for plusminus (plus minus)
9730 minusplus (minus plus)
9732 (vec_perm (plusminus @0 @1) (minusplus @2 @3) VECTOR_CST@4)
9733 (if (!VECTOR_INTEGER_TYPE_P (type)
9734 && !FLOAT_WORDS_BIG_ENDIAN
9735 /* plus is commutative, while minus is not, so :c can't be used.
9736 Do equality comparisons by hand and at the end pick the operands
9738 && (operand_equal_p (@0, @2, 0)
9739 ? operand_equal_p (@1, @3, 0)
9740 : operand_equal_p (@0, @3, 0) && operand_equal_p (@1, @2, 0)))
9743 /* Build a vector of integers from the tree mask. */
9744 vec_perm_builder builder;
9746 (if (tree_to_vec_perm_builder (&builder, @4))
9749 /* Create a vec_perm_indices for the integer vector. */
9750 poly_uint64 nelts = TYPE_VECTOR_SUBPARTS (type);
9751 vec_perm_indices sel (builder, 2, nelts);
9752 machine_mode vec_mode = TYPE_MODE (type);
9753 machine_mode wide_mode;
9754 scalar_mode wide_elt_mode;
9755 poly_uint64 wide_nunits;
9756 scalar_mode inner_mode = GET_MODE_INNER (vec_mode);
9758 (if (VECTOR_MODE_P (vec_mode)
9759 && sel.series_p (0, 2, 0, 2)
9760 && sel.series_p (1, 2, nelts + 1, 2)
9761 && GET_MODE_2XWIDER_MODE (inner_mode).exists (&wide_elt_mode)
9762 && multiple_p (GET_MODE_NUNITS (vec_mode), 2, &wide_nunits)
9763 && related_vector_mode (vec_mode, wide_elt_mode,
9764 wide_nunits).exists (&wide_mode))
9768 = lang_hooks.types.type_for_mode (GET_MODE_INNER (wide_mode),
9769 TYPE_UNSIGNED (type));
9770 tree ntype = build_vector_type_for_mode (stype, wide_mode);
9772 /* The format has to be a non-extended ieee format. */
9773 const struct real_format *fmt_old = FLOAT_MODE_FORMAT (vec_mode);
9774 const struct real_format *fmt_new = FLOAT_MODE_FORMAT (wide_mode);
9776 (if (TYPE_MODE (stype) != BLKmode
9777 && VECTOR_TYPE_P (ntype)
9782 /* If the target doesn't support v1xx vectors, try using
9783 scalar mode xx instead. */
9784 if (known_eq (GET_MODE_NUNITS (wide_mode), 1)
9785 && !target_supports_op_p (ntype, NEGATE_EXPR, optab_vector))
9788 (if (fmt_new->signbit_rw
9789 == fmt_old->signbit_rw + GET_MODE_UNIT_BITSIZE (vec_mode)
9790 && fmt_new->signbit_rw == fmt_new->signbit_ro
9791 && targetm.can_change_mode_class (TYPE_MODE (ntype),
9792 TYPE_MODE (type), ALL_REGS)
9793 && ((optimize_vectors_before_lowering_p ()
9794 && VECTOR_TYPE_P (ntype))
9795 || target_supports_op_p (ntype, NEGATE_EXPR, optab_vector)))
9796 (if (plusminus == PLUS_EXPR)
9797 (plus (view_convert:type (negate (view_convert:ntype @3))) @2)
9798 (minus @0 (view_convert:type
9799 (negate (view_convert:ntype @1))))))))))))))))
9802 (vec_perm @0 @1 VECTOR_CST@2)
9805 tree op0 = @0, op1 = @1, op2 = @2;
9806 machine_mode result_mode = TYPE_MODE (type);
9807 machine_mode op_mode = TYPE_MODE (TREE_TYPE (op0));
9809 /* Build a vector of integers from the tree mask. */
9810 vec_perm_builder builder;
9812 (if (tree_to_vec_perm_builder (&builder, op2))
9815 /* Create a vec_perm_indices for the integer vector. */
9816 poly_uint64 nelts = TYPE_VECTOR_SUBPARTS (type);
9817 bool single_arg = (op0 == op1);
9818 vec_perm_indices sel (builder, single_arg ? 1 : 2, nelts);
9820 (if (sel.series_p (0, 1, 0, 1))
9822 (if (sel.series_p (0, 1, nelts, 1))
9828 if (sel.all_from_input_p (0))
9830 else if (sel.all_from_input_p (1))
9833 sel.rotate_inputs (1);
9835 else if (known_ge (poly_uint64 (sel[0]), nelts))
9837 std::swap (op0, op1);
9838 sel.rotate_inputs (1);
9842 tree cop0 = op0, cop1 = op1;
9843 if (TREE_CODE (op0) == SSA_NAME
9844 && (def = dyn_cast <gassign *> (SSA_NAME_DEF_STMT (op0)))
9845 && gimple_assign_rhs_code (def) == CONSTRUCTOR)
9846 cop0 = gimple_assign_rhs1 (def);
9847 if (TREE_CODE (op1) == SSA_NAME
9848 && (def = dyn_cast <gassign *> (SSA_NAME_DEF_STMT (op1)))
9849 && gimple_assign_rhs_code (def) == CONSTRUCTOR)
9850 cop1 = gimple_assign_rhs1 (def);
9853 (if ((TREE_CODE (cop0) == VECTOR_CST
9854 || TREE_CODE (cop0) == CONSTRUCTOR)
9855 && (TREE_CODE (cop1) == VECTOR_CST
9856 || TREE_CODE (cop1) == CONSTRUCTOR)
9857 && (t = fold_vec_perm (type, cop0, cop1, sel)))
9861 bool changed = (op0 == op1 && !single_arg);
9862 tree ins = NULL_TREE;
9865 /* See if the permutation is performing a single element
9866 insert from a CONSTRUCTOR or constant and use a BIT_INSERT_EXPR
9867 in that case. But only if the vector mode is supported,
9868 otherwise this is invalid GIMPLE. */
9869 if (op_mode != BLKmode
9870 && (TREE_CODE (cop0) == VECTOR_CST
9871 || TREE_CODE (cop0) == CONSTRUCTOR
9872 || TREE_CODE (cop1) == VECTOR_CST
9873 || TREE_CODE (cop1) == CONSTRUCTOR))
9875 bool insert_first_p = sel.series_p (1, 1, nelts + 1, 1);
9878 /* After canonicalizing the first elt to come from the
9879 first vector we only can insert the first elt from
9880 the first vector. */
9882 if ((ins = fold_read_from_vector (cop0, sel[0])))
9885 /* The above can fail for two-element vectors which always
9886 appear to insert the first element, so try inserting
9887 into the second lane as well. For more than two
9888 elements that's wasted time. */
9889 if (!insert_first_p || (!ins && maybe_eq (nelts, 2u)))
9891 unsigned int encoded_nelts = sel.encoding ().encoded_nelts ();
9892 for (at = 0; at < encoded_nelts; ++at)
9893 if (maybe_ne (sel[at], at))
9895 if (at < encoded_nelts
9896 && (known_eq (at + 1, nelts)
9897 || sel.series_p (at + 1, 1, at + 1, 1)))
9899 if (known_lt (poly_uint64 (sel[at]), nelts))
9900 ins = fold_read_from_vector (cop0, sel[at]);
9902 ins = fold_read_from_vector (cop1, sel[at] - nelts);
9907 /* Generate a canonical form of the selector. */
9908 if (!ins && sel.encoding () != builder)
9910 /* Some targets are deficient and fail to expand a single
9911 argument permutation while still allowing an equivalent
9912 2-argument version. */
9914 if (sel.ninputs () == 2
9915 || can_vec_perm_const_p (result_mode, op_mode, sel, false))
9916 op2 = vec_perm_indices_to_tree (TREE_TYPE (op2), sel);
9919 vec_perm_indices sel2 (builder, 2, nelts);
9920 if (can_vec_perm_const_p (result_mode, op_mode, sel2, false))
9921 op2 = vec_perm_indices_to_tree (TREE_TYPE (op2), sel2);
9923 /* Not directly supported with either encoding,
9924 so use the preferred form. */
9925 op2 = vec_perm_indices_to_tree (TREE_TYPE (op2), sel);
9927 if (!operand_equal_p (op2, oldop2, 0))
9932 (bit_insert { op0; } { ins; }
9933 { bitsize_int (at * vector_element_bits (type)); })
9935 (vec_perm { op0; } { op1; } { op2; }))))))))))))
9937 /* VEC_PERM_EXPR (v, v, mask) -> v where v contains same element. */
9939 (match vec_same_elem_p
9942 (match vec_same_elem_p
9944 (if (TREE_CODE (@0) == SSA_NAME
9945 && uniform_vector_p (gimple_assign_rhs1 (SSA_NAME_DEF_STMT (@0))))))
9947 (match vec_same_elem_p
9949 (if (uniform_vector_p (@0))))
9953 (vec_perm vec_same_elem_p@0 @0 @1)
9954 (if (types_match (type, TREE_TYPE (@0)))
9958 tree elem = uniform_vector_p (@0);
9961 { build_vector_from_val (type, elem); }))))
9963 /* Push VEC_PERM earlier if that may help FMA perception (PR101895). */
9965 (plus:c (vec_perm:s (mult:c@0 @1 vec_same_elem_p@2) @0 @3) @4)
9966 (if (TREE_CODE (@0) == SSA_NAME && num_imm_uses (@0) == 2)
9967 (plus (mult (vec_perm @1 @1 @3) @2) @4)))
9969 (minus (vec_perm:s (mult:c@0 @1 vec_same_elem_p@2) @0 @3) @4)
9970 (if (TREE_CODE (@0) == SSA_NAME && num_imm_uses (@0) == 2)
9971 (minus (mult (vec_perm @1 @1 @3) @2) @4)))
9975 c = VEC_PERM_EXPR <a, b, VCST0>;
9976 d = VEC_PERM_EXPR <c, c, VCST1>;
9978 d = VEC_PERM_EXPR <a, b, NEW_VCST>; */
9981 (vec_perm (vec_perm@0 @1 @2 VECTOR_CST@3) @0 VECTOR_CST@4)
9982 (if (TYPE_VECTOR_SUBPARTS (type).is_constant ())
9985 machine_mode result_mode = TYPE_MODE (type);
9986 machine_mode op_mode = TYPE_MODE (TREE_TYPE (@1));
9987 int nelts = TYPE_VECTOR_SUBPARTS (type).to_constant ();
9988 vec_perm_builder builder0;
9989 vec_perm_builder builder1;
9990 vec_perm_builder builder2 (nelts, nelts, 1);
9992 (if (tree_to_vec_perm_builder (&builder0, @3)
9993 && tree_to_vec_perm_builder (&builder1, @4))
9996 vec_perm_indices sel0 (builder0, 2, nelts);
9997 vec_perm_indices sel1 (builder1, 1, nelts);
9999 for (int i = 0; i < nelts; i++)
10000 builder2.quick_push (sel0[sel1[i].to_constant ()]);
10002 vec_perm_indices sel2 (builder2, 2, nelts);
10004 tree op0 = NULL_TREE;
10005 /* If the new VEC_PERM_EXPR can't be handled but both
10006 original VEC_PERM_EXPRs can, punt.
10007 If one or both of the original VEC_PERM_EXPRs can't be
10008 handled and the new one can't be either, don't increase
10009 number of VEC_PERM_EXPRs that can't be handled. */
10010 if (can_vec_perm_const_p (result_mode, op_mode, sel2, false)
10011 || (single_use (@0)
10012 ? (!can_vec_perm_const_p (result_mode, op_mode, sel0, false)
10013 || !can_vec_perm_const_p (result_mode, op_mode, sel1, false))
10014 : !can_vec_perm_const_p (result_mode, op_mode, sel1, false)))
10015 op0 = vec_perm_indices_to_tree (TREE_TYPE (@4), sel2);
10018 (vec_perm @1 @2 { op0; })))))))
10021 c = VEC_PERM_EXPR <a, b, VCST0>;
10022 d = VEC_PERM_EXPR <x, c, VCST1>;
10024 d = VEC_PERM_EXPR <x, {a,b}, NEW_VCST>;
10025 when all elements from a or b are replaced by the later
10029 (vec_perm @5 (vec_perm@0 @1 @2 VECTOR_CST@3) VECTOR_CST@4)
10030 (if (TYPE_VECTOR_SUBPARTS (type).is_constant ())
10033 machine_mode result_mode = TYPE_MODE (type);
10034 machine_mode op_mode = TYPE_MODE (TREE_TYPE (@1));
10035 int nelts = TYPE_VECTOR_SUBPARTS (type).to_constant ();
10036 vec_perm_builder builder0;
10037 vec_perm_builder builder1;
10038 vec_perm_builder builder2 (nelts, nelts, 2);
10040 (if (tree_to_vec_perm_builder (&builder0, @3)
10041 && tree_to_vec_perm_builder (&builder1, @4))
10044 vec_perm_indices sel0 (builder0, 2, nelts);
10045 vec_perm_indices sel1 (builder1, 2, nelts);
10046 bool use_1 = false, use_2 = false;
10048 for (int i = 0; i < nelts; i++)
10050 if (known_lt ((poly_uint64)sel1[i], sel1.nelts_per_input ()))
10051 builder2.quick_push (sel1[i]);
10054 poly_uint64 j = sel0[(sel1[i] - sel1.nelts_per_input ())
10056 if (known_lt (j, sel0.nelts_per_input ()))
10061 j -= sel0.nelts_per_input ();
10063 builder2.quick_push (j + sel1.nelts_per_input ());
10067 (if (use_1 ^ use_2)
10070 vec_perm_indices sel2 (builder2, 2, nelts);
10071 tree op0 = NULL_TREE;
10072 /* If the new VEC_PERM_EXPR can't be handled but both
10073 original VEC_PERM_EXPRs can, punt.
10074 If one or both of the original VEC_PERM_EXPRs can't be
10075 handled and the new one can't be either, don't increase
10076 number of VEC_PERM_EXPRs that can't be handled. */
10077 if (can_vec_perm_const_p (result_mode, op_mode, sel2, false)
10078 || (single_use (@0)
10079 ? (!can_vec_perm_const_p (result_mode, op_mode, sel0, false)
10080 || !can_vec_perm_const_p (result_mode, op_mode, sel1, false))
10081 : !can_vec_perm_const_p (result_mode, op_mode, sel1, false)))
10082 op0 = vec_perm_indices_to_tree (TREE_TYPE (@4), sel2);
10087 (vec_perm @5 @1 { op0; }))
10089 (vec_perm @5 @2 { op0; })))))))))))
10091 /* And the case with swapped outer permute sources. */
10094 (vec_perm (vec_perm@0 @1 @2 VECTOR_CST@3) @5 VECTOR_CST@4)
10095 (if (TYPE_VECTOR_SUBPARTS (type).is_constant ())
10098 machine_mode result_mode = TYPE_MODE (type);
10099 machine_mode op_mode = TYPE_MODE (TREE_TYPE (@1));
10100 int nelts = TYPE_VECTOR_SUBPARTS (type).to_constant ();
10101 vec_perm_builder builder0;
10102 vec_perm_builder builder1;
10103 vec_perm_builder builder2 (nelts, nelts, 2);
10105 (if (tree_to_vec_perm_builder (&builder0, @3)
10106 && tree_to_vec_perm_builder (&builder1, @4))
10109 vec_perm_indices sel0 (builder0, 2, nelts);
10110 vec_perm_indices sel1 (builder1, 2, nelts);
10111 bool use_1 = false, use_2 = false;
10113 for (int i = 0; i < nelts; i++)
10115 if (known_ge ((poly_uint64)sel1[i], sel1.nelts_per_input ()))
10116 builder2.quick_push (sel1[i]);
10119 poly_uint64 j = sel0[sel1[i].to_constant ()];
10120 if (known_lt (j, sel0.nelts_per_input ()))
10125 j -= sel0.nelts_per_input ();
10127 builder2.quick_push (j);
10131 (if (use_1 ^ use_2)
10134 vec_perm_indices sel2 (builder2, 2, nelts);
10135 tree op0 = NULL_TREE;
10136 /* If the new VEC_PERM_EXPR can't be handled but both
10137 original VEC_PERM_EXPRs can, punt.
10138 If one or both of the original VEC_PERM_EXPRs can't be
10139 handled and the new one can't be either, don't increase
10140 number of VEC_PERM_EXPRs that can't be handled. */
10141 if (can_vec_perm_const_p (result_mode, op_mode, sel2, false)
10142 || (single_use (@0)
10143 ? (!can_vec_perm_const_p (result_mode, op_mode, sel0, false)
10144 || !can_vec_perm_const_p (result_mode, op_mode, sel1, false))
10145 : !can_vec_perm_const_p (result_mode, op_mode, sel1, false)))
10146 op0 = vec_perm_indices_to_tree (TREE_TYPE (@4), sel2);
10151 (vec_perm @1 @5 { op0; }))
10153 (vec_perm @2 @5 { op0; })))))))))))
10156 /* Match count trailing zeroes for simplify_count_trailing_zeroes in fwprop.
10157 The canonical form is array[((x & -x) * C) >> SHIFT] where C is a magic
10158 constant which when multiplied by a power of 2 contains a unique value
10159 in the top 5 or 6 bits. This is then indexed into a table which maps it
10160 to the number of trailing zeroes. */
10161 (match (ctz_table_index @1 @2 @3)
10162 (rshift (mult (bit_and:c (negate @1) @1) INTEGER_CST@2) INTEGER_CST@3))
10164 (match (cond_expr_convert_p @0 @2 @3 @6)
10165 (cond (simple_comparison@6 @0 @1) (convert@4 @2) (convert@5 @3))
10166 (if (INTEGRAL_TYPE_P (type)
10167 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
10168 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
10169 && INTEGRAL_TYPE_P (TREE_TYPE (@3))
10170 && TYPE_PRECISION (type) != TYPE_PRECISION (TREE_TYPE (@0))
10171 && TYPE_PRECISION (TREE_TYPE (@0))
10172 == TYPE_PRECISION (TREE_TYPE (@2))
10173 && TYPE_PRECISION (TREE_TYPE (@0))
10174 == TYPE_PRECISION (TREE_TYPE (@3))
10175 /* For vect_recog_cond_expr_convert_pattern, @2 and @3 can differ in
10176 signess when convert is truncation, but not ok for extension since
10177 it's sign_extend vs zero_extend. */
10178 && (TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (type)
10179 || (TYPE_UNSIGNED (TREE_TYPE (@2))
10180 == TYPE_UNSIGNED (TREE_TYPE (@3))))
10182 && single_use (@5))))
10184 (for bit_op (bit_and bit_ior bit_xor)
10185 (match (bitwise_induction_p @0 @2 @3)
10187 (nop_convert1? (bit_not2?@0 (convert3? (lshift integer_onep@1 @2))))
10190 (match (bitwise_induction_p @0 @2 @3)
10192 (nop_convert1? (bit_xor@0 (convert2? (lshift integer_onep@1 @2)) @3))))
10194 /* n - (((n > C1) ? n : C1) & -C2) -> n & C1 for unsigned case.
10195 n - (((n > C1) ? n : C1) & -C2) -> (n <= C1) ? n : (n & C1) for signed case. */
10197 (minus @0 (bit_and (max @0 INTEGER_CST@1) INTEGER_CST@2))
10198 (with { auto i = wi::neg (wi::to_wide (@2)); }
10199 /* Check if -C2 is a power of 2 and C1 = -C2 - 1. */
10200 (if (wi::popcount (i) == 1
10201 && (wi::to_wide (@1)) == (i - 1))
10202 (if (TYPE_UNSIGNED (TREE_TYPE (@0)))
10204 (cond (le @0 @1) @0 (bit_and @0 @1))))))
10206 /* -x & 1 -> x & 1. */
10208 (bit_and (negate @0) integer_onep@1)
10209 (if (!TYPE_OVERFLOW_SANITIZED (type))
10212 /* `-a` is just `a` if the type is 1bit wide or when converting
10213 to a 1bit type; similar to the above transformation of `(-x)&1`.
10214 This is used mostly with the transformation of
10215 `a ? ~b : b` into `(-a)^b`.
10216 It also can show up with bitfields. */
10218 (convert? (negate @0))
10219 (if (INTEGRAL_TYPE_P (type)
10220 && TYPE_PRECISION (type) == 1
10221 && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@0)))
10225 c1 = VEC_PERM_EXPR (a, a, mask)
10226 c2 = VEC_PERM_EXPR (b, b, mask)
10230 c3 = VEC_PERM_EXPR (c, c, mask)
10231 For all integer non-div operations. */
10232 (for op (plus minus mult bit_and bit_ior bit_xor
10235 (op (vec_perm @0 @0 @2) (vec_perm @1 @1 @2))
10236 (if (VECTOR_INTEGER_TYPE_P (type))
10237 (vec_perm (op@3 @0 @1) @3 @2))))
10239 /* Similar for float arithmetic when permutation constant covers
10240 all vector elements. */
10241 (for op (plus minus mult)
10243 (op (vec_perm @0 @0 VECTOR_CST@2) (vec_perm @1 @1 VECTOR_CST@2))
10244 (if (VECTOR_FLOAT_TYPE_P (type)
10245 && TYPE_VECTOR_SUBPARTS (type).is_constant ())
10248 tree perm_cst = @2;
10249 vec_perm_builder builder;
10250 bool full_perm_p = false;
10251 if (tree_to_vec_perm_builder (&builder, perm_cst))
10253 unsigned HOST_WIDE_INT nelts;
10255 nelts = TYPE_VECTOR_SUBPARTS (type).to_constant ();
10256 /* Create a vec_perm_indices for the VECTOR_CST. */
10257 vec_perm_indices sel (builder, 1, nelts);
10259 /* Check if perm indices covers all vector elements. */
10260 if (sel.encoding ().encoded_full_vector_p ())
10262 auto_sbitmap seen (nelts);
10263 bitmap_clear (seen);
10265 unsigned HOST_WIDE_INT count = 0, i;
10267 for (i = 0; i < nelts; i++)
10269 if (!bitmap_set_bit (seen, sel[i].to_constant ()))
10273 full_perm_p = count == nelts;
10278 (vec_perm (op@3 @0 @1) @3 @2))))))