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 9DDE63858024; Mon,  9 Jan 2023 12:31:56 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9DDE63858024
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1673267516;
	bh=E3H3O/OMeYfwjcBIzPMuPd3dItv3xWwE26se4pLeZIE=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=ipBEQzOrVw4MlrmcopvWZXZMRwOdIM688EwUBMvRK1DLhwXTifuprAFjFXN2A6OEM
	 2VwGTmwQtGQaHmS2/hYzDqpb2Cr2qmlRo7mkezrsznnRhbnSyamywDHH6tR01LIkui
	 AibLvMFGCDJeyyJzX2F5NJAhptVB04RXAd2PW18s=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/69482] Writing through pointers to volatile not
 always preserved
Date: Mon, 09 Jan 2023 12:31:55 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 5.3.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: major
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-69482-4-FcCC56jlwh@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-69482-4@http.gcc.gnu.org/bugzilla/>
References: <bug-69482-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D69482

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:a5a8242153d078f1ebe60f00409415da260a29ee

commit r13-5066-ga5a8242153d078f1ebe60f00409415da260a29ee
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jan 9 12:46:28 2023 +0100

    middle-end/69482 - not preserving volatile accesses

    The following addresses a long standing issue with not preserving
    accesses to non-volatile objects through volatile qualified
    pointers in the case that object gets expanded to a register.  The
    fix is to treat accesses to an object with a volatile qualified
    access as forcing that object to memory.  This issue got more
    exposed recently so it regressed more since GCC 11.

            PR middle-end/69482
            * cfgexpand.cc (discover_nonconstant_array_refs_r): Volatile
            qualified accesses also force objects to memory.

            * gcc.target/i386/pr69482-1.c: New testcase.
            * gcc.target/i386/pr69482-2.c: Likewise.=