From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2874 invoked by alias); 19 Sep 2013 09:03:17 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 2811 invoked by uid 48); 19 Sep 2013 09:03:15 -0000 From: "bernd.edlinger at hotmail dot de" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/57748] [4.7/4.8/4.9 Regression] ICE when expanding assignment to unaligned zero-sized array Date: Thu, 19 Sep 2013 09:03:00 -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: 4.8.0 X-Bugzilla-Keywords: ice-on-valid-code, wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: bernd.edlinger at hotmail dot de X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.8.2 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-09/txt/msg01398.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57748 --- Comment #39 from Bernd Edlinger --- (In reply to Martin Jambor from comment #37) > In order to use movmisalign_optab > instructions when we can, we should probably only do it if tem is a > structure with a zero sized array. I do also see possible problems with volatile accesses here. If we do not really need the whole structure reading everything would be wrong.