[Bug tree-optimization/33560] New: [4.3 regression] wrong code with dse and alias partitioning

["belyshev at depni dot sinp dot msu dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

Reduced from 197.parser which failed with -O1:

/* { dg-do run } */
/* { dg-options "-O1 --param max-aliased-vops=0" } */

struct T
{
  int a, b;
} t;

__attribute__((noinline)) struct T *f (struct T *p)
{
  struct T *q = __builtin_malloc (sizeof (struct T));
  *q = *p;
  return q;
}

int main (void)
{
  struct T *p;

  t.a = 1;
  t.b = 2;
  p = f (&t);
  t.a = 3;

  if (p->a != 1)
    __builtin_abort ();

  return 0;
}


-- 
           Summary: [4.3 regression] wrong code with dse and alias
                    partitioning
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: belyshev at depni dot sinp dot msu dot ru


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33560