1  /* PR c/51628.  */
       2  /* { dg-do run { target int128 } } */
       3  /* { dg-options "-O2" } */
       4  
       5  struct pair_t
       6  {
       7    char c;
       8    __int128_t i;
       9  } __attribute__ ((packed));
      10  
      11  typedef struct unaligned_int128_t_
      12  {
      13    __int128_t value;
      14  } __attribute__((packed, may_alias)) unaligned_int128_t;
      15  
      16  struct pair_t p = {0, 1};
      17  unaligned_int128_t *addr = (unaligned_int128_t *) &p.i;
      18  
      19  int 
      20  main() 
      21  {
      22    addr->value = ~(__int128_t)0;
      23    return (p.i != 1) ? 0 : 1;
      24  }