1  typedef int __attribute__ ((mode (SI))) int_t;
       2  
       3  struct s
       4  {
       5    int_t n;
       6    int_t c[];
       7  };
       8  
       9  int_t
      10  ashlsi (int_t x, const struct s *s)
      11  {
      12    int_t i;
      13  
      14    for (i = 0; i < s->n; i++)
      15      x ^= 1 << s->c[i];
      16    return x;
      17  }