gcc/testsuite/gcc.dg/tree-ssa/vrp09.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fno-tree-fre -fdisable-tree-evrp -fdump-tree-vrp1 -std=gnu89" } */
   3
   4 foo (int *p)
   5 {
   6   int x = baz ();
   7
   8   if (p == 0)
   9     goto L78;
  10   else
  11     {
  12       x = *p;
  13       /* This should be folded to if (1).  */
  14       if (p)
  15         x = x + 1;
  16 L78:
  17       /* This should not be folded to if (1).  */
  18       if (p)
  19         {
  20           x = baz (*p);
  21           /* This should be folded to if (1).  */
  22           if (p)
  23             return x + 3;
  24         }
  25
  26       return x - 3;
  27     }
  28 }
  29
  30 /* { dg-final { scan-tree-dump-times "Folding predicate p_.. != 0B to 1" 2 "vrp1" } } */