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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/115069] [14/15 regression] 8 bit integer vector
 performance regression, x86, between gcc-14 and gcc-13 using avx2 target
 clones on skylake platform
Date: Wed, 22 May 2024 02:25:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115069

--- Comment #20 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Haochen Jiang <jianghc@gcc.gnu.org>:

https://gcc.gnu.org/g:73a167cfa225d5ee7092d41596b9fea1719898ff

commit r15-764-g73a167cfa225d5ee7092d41596b9fea1719898ff
Author: Haochen Jiang <haochen.jiang@intel.com>
Date:   Tue May 21 14:10:43 2024 +0800

    i386: Disable ix86_expand_vecop_qihi2 when !TARGET_AVX512BW

    Since vpermq is really slow, we should avoid using it for permutation
    when vpmovwb is not available (needs AVX512BW) for ix86_expand_vecop_qi=
hi2
    and fall back to ix86_expand_vecop_qihi.

    gcc/ChangeLog:

            PR target/115069
            * config/i386/i386-expand.cc (ix86_expand_vecop_qihi2):
            Do not enable the optimization when AVX512BW is not enabled.

    gcc/testsuite/ChangeLog:

            PR target/115069
            * gcc.target/i386/pr115069.c: New.=