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* [Bug c/58365] New: likely wrong code bug
@ 2013-09-08 20:12 regehr at cs dot utah.edu
  2013-09-08 20:42 ` [Bug rtl-optimization/58365] " glisse at gcc dot gnu.org
                   ` (13 more replies)
  0 siblings, 14 replies; 15+ messages in thread
From: regehr at cs dot utah.edu @ 2013-09-08 20:12 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58365

            Bug ID: 58365
           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/r109 $ clang -O small.c ; ./a.out 
0
regehr@john-home ~/z/reduce/r109 $ gcc -O small.c ; ./a.out 
0
regehr@john-home ~/z/reduce/r109 $ gcc -Os small.c ; ./a.out 
1
regehr@john-home ~/z/reduce/r109 $ cat small.c
int printf(const char *, ...);
struct x0 {
  volatile int x1;
  int x2;
  int x3;
  int x4;
  int x5;
} x6;
static struct x0 x7, x8;
int x9 = 1;
char x10();
static struct x0 x11() {
  if (x10())
    return x6;
  return x7;
}

char x10() { return x9; }

int main() {
  x8 = x11();
  x6.x2 = 1;
  printf("%d\n", x8.x2);
  return 0;
}
regehr@john-home ~/z/reduce/r109 $ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/regehr/z/compiler-install/gcc-r202341-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-r202341-install
--enable-languages=c,c++ --disable-multilib
Thread model: posix
gcc version 4.9.0 20130906 (experimental) (GCC) 
regehr@john-home ~/z/reduce/r109 $


^ permalink raw reply	[flat|nested] 15+ messages in thread
end of thread, other threads:[~2014-05-07 16:20 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-09-08 20:12 [Bug c/58365] New: likely wrong code bug regehr at cs dot utah.edu
2013-09-08 20:42 ` [Bug rtl-optimization/58365] " glisse at gcc dot gnu.org
2013-09-09  6:49 ` [Bug rtl-optimization/58365] [4.7/4.8/4.9 Regression] " jakub at gcc dot gnu.org
2013-09-09  6:50 ` jakub at gcc dot gnu.org
2013-09-10  3:29 ` mkuvyrkov at gcc dot gnu.org
2013-09-10  6:08 ` mkuvyrkov at gcc dot gnu.org
2013-09-10  6:53 ` jakub at gcc dot gnu.org
2013-09-10  7:03 ` mkuvyrkov at gcc dot gnu.org
2013-09-10  7:04 ` jakub at gcc dot gnu.org
2013-09-10  7:32 ` jakub at gcc dot gnu.org
2013-09-10 11:47 ` jakub at gcc dot gnu.org
2013-09-10 11:48 ` jakub at gcc dot gnu.org
2013-09-10 11:50 ` [Bug rtl-optimization/58365] [4.7 " jakub at gcc dot gnu.org
2014-05-07 16:05 ` jakub at gcc dot gnu.org
2014-05-07 16:20 ` jakub at gcc dot gnu.org

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