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Subject: [Bug target/104610] memcmp () == 0 can be optimized better for avx512f
Date: Wed, 18 May 2022 02:47:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104610

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

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

commit r13-580-g850a13d754497faae91afabc6958780f1d63a574
Author: liuhongt <hongtao.liu@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.=