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/* { dg-do compile } */

/* { dg-options "-O2 -fdump-tree-vrp1" } */

struct A

{

  int a;

  int b;

};

foo (struct A *p, struct A *q)

{

  int *r = 0;

  if (p)

    {

      if (p == q)

        {

          /* This should be folded to 'if (1)' because q is [p, p]

             and p is ~[0, 0].  */

          if (q)

            r = &q->a;

          /* This should be folded to 'if (1)' because q should be

             ~[0, 0] and thus &q->a should be ~[0, 0].  */

          if (r)

            return 5;

        }

    }

  return q->a;

}

/* { dg-final { scan-tree-dump-times "Folding predicate q_.*to 1" 1 "vrp1" } } */

/* { dg-final { scan-tree-dump-times "Folding predicate r_.*to 1" 1 "vrp1" } } */

/* { dg-final { cleanup-tree-dump "vrp1" } } */