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From: "regehr at cs dot utah.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/51023] New: likely integer wrong code bug
Date: Tue, 08 Nov 2011 05:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51023

             Bug #: 51023
           Summary: likely integer wrong code bug
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: regehr@cs.utah.edu


Seen on Ubuntu 10.04.3.  The "-O0" result is correct.

[regehr@gamow tmp049]$ current-gcc -O0 small.c  ; ./a.out 
0
[regehr@gamow tmp049]$ current-gcc -O1 small.c  ; ./a.out 
1
[regehr@gamow tmp049]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r181147-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r181147-install
--program-prefix=r181147- --enable-languages=c,c++
Thread model: posix
gcc version 4.7.0 20111108 (experimental) (GCC) 

[regehr@gamow tmp049]$ cat small.c


int printf (const char *, ...);

struct {
  int f0;
} g_24;

short func_11 (int si1)
{
  return si1;
}

int main ()
{
  int l_141 = 0x4272A;
  g_24.f0 = func_11 (l_141) == l_141;
  printf ("%d\n", g_24.f0);
  return 0;
}