gnu/dist/gcc4/gcc/testsuite/gcc.dg/tree-ssa/vrp02.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-vrp" } */
   3
   4 struct A
   5 {
   6   int a;
   7   int b;
   8 };
   9
  10 foo (struct A *p, struct A *q)
  11 {
  12   int x = p->a;
  13   if (p == q)
  14     return q->a;
  15
  16   /* We should fold this to 'if (1)' but the assertion for 'p == q'
  17      was overwriting the assertion 'p != 0' from the first dereference
  18      of 'p'.  */
  19   if (p)
  20     return x + p->b;
  21 }
  22
  23 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 1" 1 "vrp" } } */
  24 /* { dg-final { cleanup-tree-dump "vrp" } } */