From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-342674-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 5001 invoked by alias); 7 Jan 2011 15:43:20 -0000
Received: (qmail 4992 invoked by uid 22791); 7 Jan 2011 15:43:19 -0000
X-SWARE-Spam-Status: No, hits=-2.9 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; Fri, 07 Jan 2011 15:43:15 +0000
From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/47141] [4.6 Regression] segfault
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: law at redhat dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: law at redhat dot com
X-Bugzilla-Target-Milestone: 4.6.0
X-Bugzilla-Changed-Fields: AssignedTo
Message-ID: <bug-47141-4-OE4xlZJrlz@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-47141-4@http.gcc.gnu.org/bugzilla/>
References: <bug-47141-4@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: Fri, 07 Jan 2011 16:17:00 -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: 2011-01/txt/msg00613.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47141

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot       |law at redhat dot com
                   |gnu.org                     |

--- Comment #4 from Jeffrey A. Law <law at redhat dot com> 2011-01-07 15:43:11 UTC ---
It appears that we create a new edge to the exit block, which in turn creates a
new phi arg for the vop.  That phi arg is never initialized.

The partial inlining code arranges to fixup the phi for the return value, but
never does so for the vop.

There's some code which marks the vop for renaming and removes its phi, but it
doesn't trigger for this testcase.  I suspect that's the root of our problem
and if we fix that conditional things ought to be OK.