From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-363473-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 25291 invoked by alias); 23 Jul 2011 22:16:23 -0000
Received: (qmail 25283 invoked by uid 22791); 23 Jul 2011 22:16:23 -0000
X-SWARE-Spam-Status: No, hits=-2.8 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; Sat, 23 Jul 2011 22:16:09 +0000
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/49807] Missed byte (subreg) extraction when storing to volatile mem
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields: Target Status Last reconfirmed Target Milestone Ever Confirmed
Message-ID: <bug-49807-4-6RozdIL9oE@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-49807-4@http.gcc.gnu.org/bugzilla/>
References: <bug-49807-4@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: Sat, 23 Jul 2011 22:16:00 -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: 2011-07/txt/msg01957.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49807

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|avr                         |avr, mips*-*-*
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.07.23 22:15:10
   Target Milestone|4.7.0                       |---
     Ever Confirmed|0                           |1

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-07-23 22:15:10 UTC ---
I saw this on MIPS too.(In reply to comment #5)
> Do you have an idea how to attack this optimization flaw?
To figure out the places which reduce the MEM's sizes and conditionalize them
on non volatile MEM's.
And then remove the condition in combine for not allowing volatile memory
optimizations.