https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117414
--- Comment #3 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:578002846620ed04192a4832e9f20b5c32816153 commit r15-5021-g578002846620ed04192a4832e9f20b5c32816153 Author: Andrew Pinski <quic_apin...@quicinc.com> Date: Fri Nov 1 20:06:30 2024 -0700 VN: Handle `(a | b) !=/== 0` for predicates [PR117414] For `(a | b) == 0`, we can "assert" on the true edge that both `a == 0` and `b == 0` but nothing on the false edge. For `(a | b) != 0`, we can "assert" on the false edge that both `a == 0` and `b == 0` but nothing on the true edge. This adds that predicate and allows us to optimize f0, f1, and f2 in fre-predicated-[12].c. Changes since v1: * v2: Use vn_valueize. Also canonicalize the comparison at the begining of insert_predicates_for_cond for constants to be on the rhs. Return early for non-ssa names on the lhs (after canonicalization). Bootstrapped and tested on x86_64-linux-gnu. PR tree-optimization/117414 gcc/ChangeLog: * tree-ssa-sccvn.cc (insert_predicates_for_cond): Canonicalize the comparison. Don't insert anything if lhs is not a SSA_NAME. Handle `(a | b) !=/== 0`. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/fre-predicated-1.c: New test. * gcc.dg/tree-ssa/fre-predicated-2.c: New test. Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
