1  /* { dg-do run } */
       2  /* { dg-require-effective-target int128 } */
       3  /* { dg-require-effective-target stdint_types } */
       4  /* { dg-options "-O" } */
       5  
       6  #include <stdint.h>
       7  
       8  typedef union
       9  {
      10    struct { uint64_t lo; uint64_t hi; } s;
      11    __uint128_t n;
      12  } u;
      13  
      14  int
      15  main (void)
      16  {
      17    /* Test constant folding.  */
      18    extern void link_error (void);
      19  
      20    const u U1 = { .s = { 0x1122334455667788ULL, 0xffffffffffffffffULL } };
      21    const u U2 = { .s = { 0xffffffffffffffffULL, 0x8877665544332211ULL } };
      22  
      23    if (__builtin_bswap128 (U1.n) != U2.n)
      24      link_error ();
      25  
      26    return 0;
      27  }