gcc/testsuite/gcc.dg/tree-ssa/vrp20.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-fwrapv -O1 -fno-tree-fre -fdisable-tree-evrp -ftree-vrp -fdump-tree-vrp1 -fdisable-tree-ethread -fdisable-tree-thread1" } */
   3
   4 extern void abort ();
   5 extern void exit (int);
   6
   7 int f (int a) {
   8         if (a != 0) {
   9                 a = a > 0 ? a : -a;
  10                 if (a == 0)
  11                   return 1;
  12                 return 0;
  13         }
  14         return 0;
  15 }
  16
  17 int g (int b) {
  18         if (b != 0) {
  19                 b = b > 0 ? b : -b;
  20                 if (b != 0)
  21                   return 0;
  22         }
  23         return 1;
  24 }
  25
  26 /* { dg-final { scan-tree-dump "Folding predicate a_\.\* == 0 to 0" "vrp1" } } */
  27 /* { dg-final { scan-tree-dump "Folding predicate b_\.\* != 0 to 1" "vrp1" } } */