gcc/testsuite/gcc.dg/tree-ssa/vrp06.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-vrp1" } */
   3
   4 foo (int i, int j, int a)
   5 {
   6   if (i >= 10)
   7     if (i <= 30)
   8       if (i == j)
   9         {
  10           a--;
  11
  12           /* This should fold to 'if (0)'.  */
  13           if (i < 0)
  14             i = baz ();
  15
  16           /* This should fold to 'if (1)'.  */
  17           if (j > 0)
  18             a--;
  19
  20           /* This should fold to 'if (0)'.  */
  21           if (i != j)
  22             return 0;
  23         }
  24
  25   return i + a + j;
  26 }
  27
  28 /* { dg-final { scan-tree-dump-times "Folding predicate i_.*to 0" 1 "vrp1" } } */
  29 /* { dg-final { scan-tree-dump-times "Folding predicate j_.*to 1" 1 "vrp1" } } */
  30 /* { dg-final { scan-tree-dump-times "Folding predicate i_.*to 0" 1 "vrp1" } } */
  31 /* { dg-final { cleanup-tree-dump "vrp1" } } */