https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92342
--- Comment #28 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Roger Sayle <sa...@gcc.gnu.org>: https://gcc.gnu.org/g:fd1f5373b8647a5da2f7f4b42282e676a4b04d98 commit r13-5128-gfd1f5373b8647a5da2f7f4b42282e676a4b04d98 Author: Roger Sayle <ro...@nextmovesoftware.com> Date: Thu Jan 12 21:47:40 2023 +0000 PR tree-optimization/92342: Optimize b & -(a==c) in match.pd This patch is an update/tweak of Andrew Pinski's two patches for PR tree-optimization/92342, that were originally posted by in November: https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585111.html https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585112.html Technically, the first of those was approved by Richard Biener, though never committed, and my first thought was to simply push it for Andrew, but the review of the second piece expressed concerns over comparisons in non-integral modes, where the result may not be zero-one valued. Indeed both transformations misbehave in the presence of vector mode comparisons (these transformations are already implemented for vec_cond elsewhere in match.pd), so my minor contribution is to limit these new transformations to scalars, by testing that both the operands and results are INTEGRAL_TYPE_P. 2023-01-12 Andrew Pinski <apin...@marvell.com> Roger Sayle <ro...@nextmovesoftware.com> gcc/ChangeLog: PR tree-optimization/92342 * match.pd ((m1 CMP m2) * d -> (m1 CMP m2) ? d : 0): Use tcc_comparison and :c for the multiply. (b & -(a CMP c) -> (a CMP c)?b:0): New pattern. gcc/testsuite/ChangeLog: PR tree-optimization/92342 * gcc.dg/tree-ssa/andnegcmp-1.c: New test. * gcc.dg/tree-ssa/andnegcmp-2.c: New test. * gcc.dg/tree-ssa/multcmp-1.c: New test. * gcc.dg/tree-ssa/multcmp-2.c: New test.
