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From: "dhazeghi at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/57300] New: statement in expression miscompiled at -O3 in 32-bit mode
Date: Wed, 15 May 2013 19:41:00 -0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 4.9.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: dhazeghi at yahoo dot com
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X-Bugzilla-Priority: P3
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57300

            Bug ID: 57300
           Summary: statement in expression miscompiled at -O3 in 32-bit
                    mode
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dhazeghi at yahoo dot com

The following testcase appears to be miscompiled with gcc 4.8 and trunk on
x86_64-linux-gnu at -O3 optimization level in 32-bit mode.  In 64-bit mode, at
lower optimization, or with gcc 4.7 and earlier it works correctly.

$ gcc-trunk -v
Target: x86_64-unknown-linux-gnu
...
gcc version 4.9.0 20130515 (experimental) [trunk revision 198926] (GCC) 
$ gcc-trunk -O2 -m32 small.c
$ ./a.out 
1
$ gcc-trunk -O3 -m64 small.c
$ ./a.out 
1
$ gcc-4.7 -O3 -m32 small.c
$ ./a.out 
1
$ gcc-trunk -O3 -m32 small.c
$ ./a.out 
0
$

------------------------------

int printf (const char *, ...);
int a, b, e;
long long c;
int d[10];
int
main ()
{
    int *f = &a;
    e = 0;
    for (; e < 10; e++)
        d[e] = 1;
    if (d[0])
        c = (
    {
        int g = *f = (
        {
            b == 0 || 1 % b;
        });
        g;
    }
    );
    printf ("%d\n", a);
    return 0;
}