https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114894
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:e472527c7b45d23e8dfd0fb767a6e663b4bc136e commit r15-307-ge472527c7b45d23e8dfd0fb767a6e663b4bc136e Author: Andrew Pinski <quic_apin...@quicinc.com> Date: Tue Apr 30 14:45:26 2024 -0700 MATCH: Add some more value_replacement simplifications (a != 0 ? expr : 0) to match This adds a few more of what is currently done in phiopt's value_replacement to match. I noticed this when I was hooking up phiopt's value_replacement code to use match and disabling the old code. But this can be done independently from the hooking up phiopt's value_replacement as phiopt is already hooked up for simplified versions already. /* a != 0 ? a / b : 0 -> a / b iff b is nonzero. */ /* a != 0 ? a * b : 0 -> a * b */ /* a != 0 ? a & b : 0 -> a & b */ We prefer the `cond ? a : 0` forms to allow optimization of `a * cond` which uses that form. Bootstrapped and tested on x86_64-linux-gnu with no regressions. PR tree-optimization/114894 gcc/ChangeLog: * match.pd (`a != 0 ? a / b : 0`): New pattern. (`a != 0 ? a * b : 0`): New pattern. (`a != 0 ? a & b : 0`): New pattern. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/phi-opt-value-5.c: New test. Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
