From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-334802-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 16583 invoked by alias); 26 Oct 2010 14:23:40 -0000
Received: (qmail 16574 invoked by uid 22791); 26 Oct 2010 14:23:39 -0000
X-SWARE-Spam-Status: No, hits=-2.6 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 26 Oct 2010 14:23:33 +0000
From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/46185] New: [4.6 Regression] gcc.dg/graphite/interchange-4.c FAILs with -fno-ipa-cp
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: zsojka at seznam dot cz
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-46185-4@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
Date: Tue, 26 Oct 2010 14:23:00 -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
X-SW-Source: 2010-10/txt/msg02191.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46185

           Summary: [4.6 Regression] gcc.dg/graphite/interchange-4.c FAILs
                    with -fno-ipa-cp
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Output (with #define DEBUG 1):
$ gcc -O2 -floop-interchange -ffast-math interchange-4.c && ./a.out
res = 3565793
$ gcc -O2 -floop-interchange -ffast-math interchange-4.c -fno-ipa-cp && ./a.out
res = 1343 
Aborted
$ gcc -O1 -floop-interchange -ffast-math interchange-4.c && ./a.out
res = 1343 
Aborted

The same effect can be achieved by adding attribute noclone to foo().

Tested revisions:
r165915 - fail
r163636 - fail
r161659 - OK