1  /* PR debug/46893 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O -g" } */
       4  
       5  void
       6  foo (void)
       7  {
       8    union { unsigned long long l; double d; } u = { 0x7ff0000000000000ULL };
       9    double v = 0, w = -u.d;
      10  
      11    if (w)
      12      w = v;
      13  }