1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -ftree-vectorize" } */
       3  
       4  typedef unsigned short ush;
       5  extern ush prev[];
       6  
       7  void fill_window ()
       8  {
       9    register unsigned n, m;
      10  
      11    for (n = 0; n < 32768; n++)
      12      {
      13        m = prev[n];
      14        prev[n] = (ush) (m >= 0x8000 ? m - 0x8000 : 0);
      15      }
      16  }