1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  
       4  #define HUGE __DBL_MAX__
       5  #define INF (HUGE + HUGE)
       6  #define NAN (INF - INF)
       7  
       8  double foo() {
       9    double x = -NAN;
      10    double y = NAN;
      11    return x + y;
      12  }
      13  
      14  /* { dg-final { scan-tree-dump-not "return 0\.0" "optimized" } } */