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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/59101] New: integer wrong code bug
Date: Wed, 13 Nov 2013 05:59:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 4.9.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: regehr at cs dot utah.edu
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59101

            Bug ID: 59101
           Summary: integer wrong code bug
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: regehr at cs dot utah.edu

$ gcc -O0 foo.c ; ./a.out 
7
$ gcc -O1 foo.c ; ./a.out 
6
$ cat foo.c
int printf(const char *, ...);
int a, b;

int main() {
  b = (~a & 4102790424) > 0 | 6;
  printf("%d\n", b);
  return 0;
}

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/regehr/z/compiler-install/gcc-r204695-install/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/regehr/z/compiler-source/gcc/configure
--prefix=/home/regehr/z/compiler-install/gcc-r204695-install
--enable-languages=c,c++ --enable-multilib
Thread model: posix
gcc version 4.9.0 20131112 (experimental) (GCC)