From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-380642-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 19963 invoked by alias); 20 Jan 2012 14:17:53 -0000
Received: (qmail 19949 invoked by uid 22791); 20 Jan 2012 14:17:53 -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, 20 Jan 2012 14:17:40 +0000
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/50444] [4.6/4.7 Regression] -ftree-sra ignores alignment
Date: Fri, 20 Jan 2012 14:27:00 -0000
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: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.6.3
X-Bugzilla-Changed-Fields: Status AssignedTo
Message-ID: <bug-50444-4-XPU7YamEiH@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-50444-4@http.gcc.gnu.org/bugzilla/>
References: <bug-50444-4@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: 2012-01/txt/msg02317.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50444

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #15 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-20 14:16:25 UTC ---
Created attachment 26395
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26395
other candidate patch

I'm testing the following patch instead, which avoids changing access types
for all-scalar across-link propagations (we're going to create proper V_C_Es
later).  I also remove the fancy code that tries to avoid adding V_C_Es,
it looks it will cause more trouble than missed-optimizations.

That way we completely avoid needing to care for alignment at that particular
places.  Whether the aggregate copy across-link propagation is affected in
a similar way remains to be seen.

I'll see if I run into the same issue as you and investigate that.