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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug string/29611] Optimized AVX2 string functions unconditionally
 use BMI2 instructions
Date: Mon, 03 Oct 2022 21:56:17 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29611

--- Comment #51 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot g=
nu.org> ---
The release/2.35/master branch has been updated by Aurelien Jarno
<aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3D02aa1f4a5b6955f2cb3=
84daa4e520d9c8078a078

commit 02aa1f4a5b6955f2cb384daa4e520d9c8078a078
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Mon Oct 3 23:16:46 2022 +0200

    x86-64: Require BMI2 and LZCNT for AVX2 memrchr implementation

    The AVX2 memrchr implementation uses the 'shlxl' instruction, which
    belongs to the BMI2 CPU feature and uses the 'lzcnt' instruction, which
    belongs to the LZCNT CPU feature.

    Fixes: af5306a735eb ("x86: Optimize memrchr-avx2.S")
    Partially resolves: BZ #29611

    Reviewed-by: Noah Goldstein  <goldstein.w.n@gmail.com>
    (cherry picked from commit 3c0c78afabfed4b6fc161c159e628fbf14ff370b)

--- Comment #52 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot g=
nu.org> ---
The release/2.35/master branch has been updated by Aurelien Jarno
<aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3D20152a849b34abe83c7=
02b27b7276c96b191b644

commit 20152a849b34abe83c702b27b7276c96b191b644
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Mon Oct 3 23:16:46 2022 +0200

    x86-64: Require BMI1/BMI2 for AVX2 strrchr and wcsrchr implementations

    The AVX2 strrchr and wcsrchr implementation uses the 'blsmsk'
    instruction which belongs to the BMI1 CPU feature and the 'shrx'
    instruction, which belongs to the BMI2 CPU feature.

    Fixes: df7e295d18ff ("x86: Optimize {str|wcs}rchr-avx2")
    Partially resolves: BZ #29611

    Reviewed-by: Noah Goldstein  <goldstein.w.n@gmail.com>
    (cherry picked from commit 7e8283170c5d6805b609a040801d819e362a6292)

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