gnu/dist/gcc4/gcc/testsuite/gcc.dg/tree-ssa/pr20657.c

   1 /* PR tree-optimization/20657
   2    VRP did not pick up a conditional equivalence from the first "if"
   3    statement, which was needed to eliminate the second "if" statement.  */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-vrp-details" } */
   7
   8 int
   9 foo (int a)
  10 {
  11   if (a == 0)
  12     if (a == 0)
  13       return 1;
  14   return 0;
  15 }
  16
  17 /* { dg-final { scan-tree-dump-times "Folding predicate" 1 "vrp"} } */
  18 /* { dg-final { cleanup-tree-dump "vrp" } } */