From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-prs-return-33765-listarch-gcc-prs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 2871 invoked by alias); 29 Apr 2003 13:16:01 -0000
Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc-prs/>
List-Post: <mailto:gcc-prs@gcc.gnu.org>
List-Help: <mailto:gcc-prs-help@gcc.gnu.org>
Sender: gcc-prs-owner@gcc.gnu.org
Received: (qmail 2824 invoked by uid 71); 29 Apr 2003 13:16:01 -0000
Resent-Date: 29 Apr 2003 13:16:01 -0000
Resent-Message-ID: <20030429131601.2823.qmail@sources.redhat.com>
Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer)
Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Resent-Reply-To: gcc-gnats@gcc.gnu.org, uweigand@de.ibm.com
Received: (qmail 982 invoked by uid 48); 29 Apr 2003 13:08:52 -0000
Message-Id: <20030429130852.981.qmail@sources.redhat.com>
Date: Tue, 29 Apr 2003 13:16:00 -0000
From: uweigand@de.ibm.com
Reply-To: uweigand@de.ibm.com
To: gcc-gnats@gcc.gnu.org
X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31)
Subject: optimization/10536: [3.3/3.4 regression] Linux kernel miscompiled on s390
X-SW-Source: 2003-04/txt/msg01335.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         10536
>Category:       optimization
>Synopsis:       [3.3/3.4 regression] Linux kernel miscompiled on s390
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 29 13:16:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     uweigand@de.ibm.com
>Release:        gcc 3.3, head
>Organization:
>Environment:
s390-ibm-linux / s390x-ibm-linux
>Description:
In the following test case:

extern int global_var;
void test (void)
{
   int x = global_var;
   asm volatile ("" : "+d" (x));
}

the instruction to load 'global_var' into a register
is erroneously omitted.  This causes incorrect code
to be generated for the Linux kernel on s390.

This is a regression over 3.2, introduced by this patch:
http://gcc.gnu.org/ml/gcc-patches/2003-03/msg01070.html
>How-To-Repeat:
Compile the test case shown above, and verify whether
the resulting assembler code references 'global_var'.
>Fix:
Either revert
http://gcc.gnu.org/ml/gcc-patches/2003-03/msg01070.html
or add the fix
http://gcc.gnu.org/ml/gcc-patches/2003-04/msg01318.html
>Release-Note:
>Audit-Trail:
>Unformatted: