From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-121158-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 13157 invoked by alias); 5 Dec 2004 08:55:44 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
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
Received: (qmail 13069 invoked by uid 48); 5 Dec 2004 08:55:39 -0000
Date: Sun, 05 Dec 2004 08:55:00 -0000
From: "felix dot nawothnig at t-online dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20041205085537.18842.felix.nawothnig@t-online.de>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c++/18842] New: Weak optimization on global references
X-Bugzilla-Reason: CC
X-SW-Source: 2004-12/txt/msg00691.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

int x, &y = x;
int main() { y = 42; }

produces

x:
        .zero   4
...
y:
        .long   x
...
        movl    y, %eax
        movl    $42, (%eax)

Since a non-arg reference is always (?) constant it would be safe to omit

        movl    $42, x

-- 
           Summary: Weak optimization on global references
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: felix dot nawothnig at t-online dot de
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18842