[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

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115069

--- Comment #21 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-14 branch has been updated by Haochen Jiang
<jian...@gcc.gnu.org>:

https://gcc.gnu.org/g:1ad5c9d524d8fa99773045e75da04ae958012085

commit r14-10229-g1ad5c9d524d8fa99773045e75da04ae958012085
Author: Haochen Jiang <haochen.ji...@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_qihi2
    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.