gcc/testsuite/gcc.dg/tree-ssa/ssa-dce-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-dce3" } */
   3
   4 /* We should notice constantness of this function. */
   5 static int __attribute__((noinline)) t(int a)
   6 {
   7         return a+1;
   8 }
   9 void q(void)
  10 {
  11   int i = t(1);
  12   if (!i)
  13     i = t(1);
  14 }
  15 /* There should be no IF conditionals.  */
  16 /* { dg-final { scan-tree-dump-times "if " 0 "dce3"} } */
  17 /* { dg-final { cleanup-tree-dump "dce3" } } */