/* { dg-do compile } *//* { dg-options "-O1 -fdump-tree-optimized" } */int f(int a, int b){  if (a == 0)   return 0;  if (a != b)   return a; return a;}/* There should be no ifs as the PHI arguments, we did not   optimize this before because PHI-OPT did not look at    PHIs which have more than two arguments.  *//* { dg-final { scan-tree-dump-times "if" 0 "optimized"} } *//* { dg-final { cleanup-tree-dump "optimized" } } */