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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 22:02:43 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29611

--- Comment #59 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot g=
nu.org> ---
The release/2.34/master branch has been updated by Aurelien Jarno
<aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3De570b865b53f33453d9=
7160791a7d97e38bcc6e8

commit e570b865b53f33453d97160791a7d97e38bcc6e8
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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