1  /* { dg-do compile } */
       2  /* { dg-require-effective-target int128 } */
       3  /* { dg-final { scan-assembler-not "call" } } */
       4  
       5  __uint128_t foo (__uint128_t x)
       6  {
       7    return __builtin_bswap128 (x);
       8  }