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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 x = p->a;

  if (p == q)

    return q->a;

  /* We should fold this to 'if (1)' but the assertion for 'p == q'

     was overwriting the assertion 'p != 0' from the first dereference

     of 'p'.  */

  if (p)

    return x + p->b;

}

/* Target with fno-delete-null-pointer-checks should not fold check */

/* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 1" 1 "vrp1" { target { ! keeps_null_pointer_checks } } } } */

/* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 1" 0 "vrp1" { target {   keeps_null_pointer_checks } } } } */

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