https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31531
--- Comment #21 from CVS 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:29a4453c7b8a86d242dab89b9e4d222749fd911e commit r14-4661-g29a4453c7b8a86d242dab89b9e4d222749fd911e Author: Andrew Pinski <pins...@gmail.com> Date: Sun Oct 15 15:18:42 2023 -0700 [PR31531] MATCH: Improve ~a < ~b and ~a < CST, allow a nop cast inbetween ~ and a/b Currently we able to simplify `~a CMP ~b` to `b CMP a` but we should allow a nop conversion in between the `~` and the `a` which can show up. A similarly thing should be done for `~a CMP CST`. I had originally submitted the `~a CMP CST` case as https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585088.html; I noticed we should do the same thing for the `~a CMP ~b` case and combined it with that one here. OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. PR tree-optimization/31531 gcc/ChangeLog: * match.pd (~X op ~Y): Allow for an optional nop convert. (~X op C): Likewise. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/pr31531-1.c: New test. * gcc.dg/tree-ssa/pr31531-2.c: New test.
