gcc/testsuite/gcc.dg/tree-ssa/vrp02.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-vrp1 -fdelete-null-pointer-checks" } */
   3
   4 struct A
   5 {
   6   int a;
   7   int b;
   8 };
   9
  10 int
  11 foo (struct A *p, struct A *q)
  12 {
  13   int x = p->a;
  14   if (p == q)
  15     return q->a;
  16
  17   /* We should fold this to 'if (1)' but the assertion for 'p == q'
  18      was overwriting the assertion 'p != 0' from the first dereference
  19      of 'p'.  */
  20   if (p)
  21     return x + p->b;
  22 }
  23 /* Target disabling -fdelete-null-pointer-checks should not fold check */
  24 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 1" 1 "vrp1" { target { ! keeps_null_pointer_checks } } } } */
  25 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 1" 0 "vrp1" { target {   keeps_null_pointer_checks } } } } */