From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 3CAFB395B083; Mon, 29 Jun 2020 21:30:25 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3CAFB395B083
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1593466225;
 bh=l2Qh0JHgmOqH9zwhgEc3LA8DC/9XoYAcUSeW2p224UM=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=HAeZ+o5cljmNMFgQ+95qP5wO2WKJ4ZhQbB9tiTdPM5etKbqIigL3eMhjP2i5Ngox3
 u66WNovQu07/YjeRCb0trfaczr/js37AUlRFwpNLAD/546+tZoWiwFCUeXWgKgWLgH
 QA7WUbyFUP3bO4eZxqYkDF4RXdRb836SDlIv/ZVI=
From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/95971] [10 regression] Optimizer converts a false boolean
 value into a true boolean value
Date: Mon, 29 Jun 2020 21:30:25 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: other
X-Bugzilla-Version: 10.1.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: glisse at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: INVALID
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-95971-4-AkJg5y3zkR@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-95971-4@http.gcc.gnu.org/bugzilla/>
References: <bug-95971-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <http://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <http://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 29 Jun 2020 21:30:25 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95971

--- Comment #11 from Marc Glisse <glisse at gcc dot gnu.org> ---
        while(!a.isZero());

that doesn't look like something you would find in real code. Are you waiti=
ng
for a different thread to modify a? Then you should use an atomic operation.
Are you waiting for the hardware to change something? Use volatile. Do you
really want an infinite loop? Spell it out if(!a.isZero())for(;;);=