/* { dg-do compile } *//* { dg-options "-O1 -fdump-tree-optimized" } */_Bool f1(_Bool a, _Bool b){  if (a)   {     if (b)      return 1;     else      return 0;   }  return 0;}/* There should be only one if, the outer one; the inner one   should have been changed to straight line code with the   value of b (except that we don't fold ! (b != 0) into b   which can be fixed in a different patch).  *//* { dg-final { scan-tree-dump-times "if" 1 "optimized"} } *//* { dg-final { cleanup-tree-dump "optimized" } } */