gcc/testsuite/c-c++-common/pr51628-10.c

   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 }