From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-420696-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 1126 invoked by alias); 21 Apr 2013 14:22:46 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 1089 invoked by uid 48); 21 Apr 2013 14:22:43 -0000
From: "dank at kegel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/57003] gcc-4.8.0 breaks -O2 optimization with Wine(64) - links/info/bisect of commits included
Date: Sun, 21 Apr 2013 14:22:00 -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-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dank at kegel dot com
X-Bugzilla-Status: WAITING
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields: CC
Message-ID: <bug-57003-4-FDJoM6FX5k@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-57003-4@http.gcc.gnu.org/bugzilla/>
References: <bug-57003-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
X-SW-Source: 2013-04/txt/msg01841.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57003

dank at kegel dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dank at kegel dot com

--- Comment #4 from dank at kegel dot com 2013-04-21 14:22:41 UTC ---
Austin English said

"I did...that's what led to the original commit showing the segfault.
IOW:
$ git reset --hard c8010b803d34fa7e096747067e33c650b36ecc06
# build gcc/wine - gcc fails to build wine, internal compiler error
$ git show d73df2920c77116fd88e03cd95dd352f16511a3f | patch -p1
# build gcc/wine - wine segfaults on launch"

So bisecting seems complete.

Also, Kirill Smirnov reports that building wine using just -O2 runs into
this bug for him, but building wine with "-O2 -fno-builtin-memcpy" doesn't.

Next step may be to bisect wine's source code to see which file or files
misbehave when built with -O2 but without -fno-builtin-memcpy.