https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117414
--- Comment #4 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:add4bb94459d6cecae11de279b49f9c1acb14394 commit r15-5022-gadd4bb94459d6cecae11de279b49f9c1acb14394 Author: Andrew Pinski <quic_apin...@quicinc.com> Date: Fri Nov 1 23:12:52 2024 -0700 VN: Handle `(A CMP B) !=/== 0` for predicates [PR117414] After the last patch, we also want to record `(A CMP B) != 0` as `(A CMP B)` and `(A CMP B) == 0` as `(A CMP B)` with the true/false edges swapped. This shows up more due to the new handling of `(A | B) ==/!= 0` in insert_predicates_for_cond as now we can notice these comparisons which were not seen before. This is enough to fix the original issue in `gcc.dg/tree-ssa/pr111456-1.c` and make sure we don't regress it when enhancing ifcombine. This adds that predicate and allows us to optimize f in fre-predicated-3.c. Changes since v1: * v2: Use vn_valueize. Bootstrapped and tested on x86_64-linux-gnu. PR tree-optimization/117414 gcc/ChangeLog: * tree-ssa-sccvn.cc (insert_predicates_for_cond): Handle `(A CMP B) !=/== 0`. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/fre-predicated-3.c: New test. Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
