[Bug tree-optimization/57861] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57861

            Bug ID: 57861
           Summary: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The current gcc trunk produces wrong code for the following testcase on
x86_64-linux when compiled at -O3 in 32-bit mode. This is a regression from
4.8.x.

$ gcc-trunk -v
gcc version 4.9.0 20130708 (experimental) [trunk revision 200751] (GCC) 
$ gcc-trunk -m32 -O3 reduced.c
$ a.out
1
$ gcc-trunk -m32 -O2 reduced.c
$ a.out
0
$ gcc-4.8 -m32 -O3 reduced.c
$ a.out
0
$ 


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


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

short a = 1, f;
int b, c, d, *g = &b, h, i, j;
unsigned int e;

static int
foo (char p)
{
  int k;
  for (c = 0; c < 2; c++)
    {
      i = (j = 0) || p;
      k = i * p;
      if (e < k)
        {
      short *l = &f;
      a = d && h;
      *l = 0;
        }
    }
  return 0;
}

int
main ()
{
  *g = foo (a);
  printf ("%d\n", a);
  return 0;
}