gcc/testsuite/gcc.dg/tree-ssa/vrp04.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-vrp1" } */
   3
   4 foo (int a, int b)
   5 {
   6   if (a == b)
   7     /* This should be folded to if (1)  */
   8     if (a == b)
   9       return a + b;
  10 }
  11
  12 /* { dg-final { scan-tree-dump-times "Folding predicate a_.*to 1" 1 "vrp1" } } */
  13 /* { dg-final { cleanup-tree-dump "vrp1" } } */