https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112483
--- Comment #20 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Xi Ruoyao <xry...@gcc.gnu.org>: https://gcc.gnu.org/g:9e9279fadbd1c673c875b9d20261d2de0473f63f commit r14-5542-g9e9279fadbd1c673c875b9d20261d2de0473f63f Author: Andrew Pinski <pins...@gmail.com> Date: Mon Nov 13 20:18:34 2023 +0000 Only allow (copysign x, NEG_CONST) -> (fneg (fabs x)) simplification for constant folding [PR112483] On targets with native copysign instructions, (copysign x, -1) is usually more efficient than (fneg (fabs x)). Since r14-5284, in the middle end we always optimize (fneg (fabs x)) to (copysign x, -1), not vice versa. If the target does not support native fcopysign, expand_COPYSIGN will expand it as (fneg (fabs x)) anyway. gcc/ChangeLog: PR rtl-optimization/112483 * simplify-rtx.cc (simplify_binary_operation_1) <case COPYSIGN>: Call simplify_unary_operation for NEG instead of simplify_gen_unary.
