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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/58385] New: likely wrong code bug
Date: Tue, 10 Sep 2013 17:11:00 -0000
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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-Who: regehr at cs dot utah.edu
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58385

            Bug ID: 58385
           Summary: likely 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
                CC: chenyang at cs dot utah.edu

regehr@john-home ~/z/reduce/r112 $ gcc -O0 small.c ; ./a.out
0
regehr@john-home ~/z/reduce/r112 $ gcc -O1 small.c ; ./a.out
1
regehr@john-home ~/z/reduce/r112 $ cat small.c
int printf(const char *, ...);
int x0, x1 = 1;
int x2() {
  x1 = 0;
  return 0;
}

int main() {
  ((0 || x0) & x2() >= 0) <= 1 && 1;
  printf("%d\n", x1);
  return 0;
}
regehr@john-home ~/z/reduce/r112 $ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/regehr/z/compiler-install/gcc-r202470-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-r202470-install
--enable-languages=c,c++ --disable-multilib
Thread model: posix
gcc version 4.9.0 20130910 (experimental) (GCC)