1  /* { dg-do compile } */
       2  /* { dg-additional-options "-O3" } */
       3  /* { dg-additional-options "-mavx2" { target { i?86-*-* x86_64-*-* } } } */
       4  
       5  int a, b;
       6  
       7  void
       8  fn1 ()
       9  {
      10    int c, d;
      11    for (; b; b++)
      12      a = a ^ !c ^ !d;
      13  }