1  extern void *memset (void *, int, __SIZE_TYPE__);
       2  extern void abort (void);
       3  
       4  struct reg_stat {
       5    void *last_death;
       6    void *last_set;
       7    void *last_set_value;
       8    int   last_set_label;
       9    char  last_set_sign_bit_copies;
      10    int   last_set_mode : 8;
      11    char  last_set_invalid;
      12    char sign_bit_copies;
      13    long nonzero_bits;
      14  };
      15  
      16  static struct reg_stat *reg_stat;
      17  
      18  void __attribute__((noinline))
      19  init_reg_last (void)
      20  {
      21    memset (reg_stat, 0, __builtin_offsetof (struct reg_stat, sign_bit_copies));
      22  }
      23  
      24  int main (void)
      25  {
      26    struct reg_stat r;
      27  
      28    reg_stat = &r;
      29    r.nonzero_bits = -1;
      30    init_reg_last ();
      31    if (r.nonzero_bits != -1)
      32      abort ();
      33    return 0;
      34  }