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From: uweigand@de.ibm.com
To: gcc-gnats@gcc.gnu.org
Subject: optimization/10536: [3.3/3.4 regression] Linux kernel miscompiled on s390
Date: Tue, 29 Apr 2003 13:16:00 -0000 [thread overview]
Message-ID: <20030429130852.981.qmail@sources.redhat.com> (raw)
>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:
next reply other threads:[~2003-04-29 13:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-29 13:16 uweigand [this message]
2003-04-29 13:17 uweigand
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