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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 22:05:18 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29611

--- Comment #64 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot g=
nu.org> ---
The release/2.33/master branch has been updated by Aurelien Jarno
<aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3D38e321f4ac70b6aecb3=
5a8af7d1a2fbe366ab482

commit 38e321f4ac70b6aecb35a8af7d1a2fbe366ab482
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)

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