[Bug target/104610] memcmp () == 0 can be optimized better for avx512f

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104610

--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>:

https://gcc.gnu.org/g:850a13d754497faae91afabc6958780f1d63a574

commit r13-580-g850a13d754497faae91afabc6958780f1d63a574
Author: liuhongt <hongtao....@intel.com>
Date:   Tue Mar 1 13:41:52 2022 +0800

    Expand __builtin_memcmp_eq with ptest for OImode.

    gcc/ChangeLog:

            PR target/104610
            * config/i386/i386-expand.cc (ix86_expand_branch): Use ptest
            for QImode when code is EQ or NE.
            * config/i386/i386.md (cbranchoi4): New expander.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr104610.c: New test.