From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-384849-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 17135 invoked by alias); 29 Feb 2012 11:31:00 -0000
Received: (qmail 17124 invoked by uid 22791); 29 Feb 2012 11:30:59 -0000
X-SWARE-Spam-Status: No, hits=-2.8 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,TW_GJ
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; Wed, 29 Feb 2012 11:30:46 +0000
From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/52001] [4.7 Regression] Huge compile-time regression with var-tracking
Date: Wed, 29 Feb 2012 11:36:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: debug
X-Bugzilla-Keywords: compile-time-hog
X-Bugzilla-Severity: normal
X-Bugzilla-Who: gjl at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: jakub at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.7.0
X-Bugzilla-Changed-Fields: CC
Message-ID: <bug-52001-4-iXrynglvPL@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-52001-4@http.gcc.gnu.org/bugzilla/>
References: <bug-52001-4@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
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: 2012-02/txt/msg02783.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52001

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gjl at gcc dot gnu.org

--- Comment #7 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-02-29 11:30:14 UTC ---
(In reply to comment #6)
> Author: aoliva
> Date: Sat Feb 25 12:09:41 2012
> New Revision: 184572
> 
> URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=184572
> Log:
> PR debug/52001
> * alias.c (refs_newer_value_cb, refs_newer_value_p): New.
> (get_addr): Walk canonical value's locs.  Avoid returning VALUEs
> and locs that reference values newer than the non-canonical value
> at hand.  Return the canonical value as a worst case.
> (memrefs_conflict_p): Walk canonical value's locs.
> 
> Modified:
>     trunk/gcc/ChangeLog
>     trunk/gcc/alias.c

This caused PR52417.

With alias.c at r184571 the compiler does not enter infinite loop.