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From: Jeff Law <law@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r14-1952] Do not allow "x + 0.0" to "x" optimization with -fsignaling-nans Date: Mon, 19 Jun 2023 17:53:21 +0000 (GMT) [thread overview] Message-ID: <20230619175321.142DA3858D1E@sourceware.org> (raw) https://gcc.gnu.org/g:827b2a279fc6ad5bb76e4d2c2eb3432955b5e11c commit r14-1952-g827b2a279fc6ad5bb76e4d2c2eb3432955b5e11c Author: Toru Kisuki <tkisuki@tachyum.com> Date: Mon Jun 19 11:51:09 2023 -0600 Do not allow "x + 0.0" to "x" optimization with -fsignaling-nans gcc/ PR rtl-optimization/110305 * simplify-rtx.cc (simplify_context::simplify_binary_operation_1): Handle HONOR_SNANS for x + 0.0. Diff: --- gcc/simplify-rtx.cc | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/gcc/simplify-rtx.cc b/gcc/simplify-rtx.cc index 9c68d360672..1b581447de6 100644 --- a/gcc/simplify-rtx.cc +++ b/gcc/simplify-rtx.cc @@ -2831,7 +2831,8 @@ simplify_context::simplify_binary_operation_1 (rtx_code code, when x is NaN, infinite, or finite and nonzero. They aren't when x is -0 and the rounding mode is not towards -infinity, since (-0) + 0 is then 0. */ - if (!HONOR_SIGNED_ZEROS (mode) && trueop1 == CONST0_RTX (mode)) + if (!HONOR_SIGNED_ZEROS (mode) && !HONOR_SNANS (mode) + && trueop1 == CONST0_RTX (mode)) return op0; /* ((-a) + b) -> (b - a) and similarly for (a + (-b)). These
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