From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 4611F385742F; Mon,  3 Oct 2022 21:51:10 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4611F385742F
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org;
	s=default; t=1664833870;
	bh=B4bnvG7mhpTD3b07ydR0wdTGku+g4rDvIYpHvf96GnI=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=KPyrWjYY8/qHU9J2xJApYa2O8vmtA88VM5OFcQSsgY0COxkVjied7yIZ88BimIWwW
	 wUCdfwon13YXhO9TVw54H45Mw/x3wm6M4h+zKCa30MCMtT7oBGKKSqNqP3wONeSzQj
	 e0QT1BKj6t4Hv6pbywH5Pn6/esa82bjPChcqDIR0=
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 21:51:10 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: string
X-Bugzilla-Version: 2.31
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: critical
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: REOPENED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: goldstein.w.n at gmail dot com
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-29611-131-Z7JhkdNxHN@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-29611-131@http.sourceware.org/bugzilla/>
References: <bug-29611-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <glibc-bugs.sourceware.org>

https://sourceware.org/bugzilla/show_bug.cgi?id=3D29611

--- Comment #40 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot g=
nu.org> ---
The release/2.36/master branch has been updated by Aurelien Jarno
<aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3D7afbd1e56acb721031b=
ffd876f275dcb1af7e530

commit 7afbd1e56acb721031bffd876f275dcb1af7e530
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Mon Oct 3 23:46:11 2022 +0200

    x86-64: Require BMI2 for AVX2 strcmp implementation

    The AVX2 strcmp implementation uses the 'bzhi' instruction, which
    belongs to the BMI2 CPU feature.

    NB: It also uses the 'tzcnt' BMI1 instruction, but it is executed as BSF
    as BSF if the CPU doesn't support TZCNT, and produces the same result
    for non-zero input.

    Partially fixes: b77b06e0e296 ("x86: Optimize strcmp-avx2.S")
    Partially resolves: BZ #29611

    Reviewed-by: Noah Goldstein  <goldstein.w.n@gmail.com>
    (cherry picked from commit 4d64c6445735e9b34e2ac8e369312cbfc2f88e17)

--=20
You are receiving this mail because:
You are on the CC list for the bug.=