1  /* { dg-do compile } */ 
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  int main(int a, int b, int c, int d)
       4  {
       5    /* Should become just a & b & c & d */
       6    int e = (a & b) & (c & d);
       7    int f = (c & a) & (b & d);
       8    return e & f;
       9  }
      10  /* { dg-final { scan-tree-dump-times "\\\& " 3 "optimized"} } */