union U
{
  const int a;
  unsigned b : 20;
};

static union U u = { 0x12345678 };

/* Constant folding used to fail to account for endianness when folding a
   union.  */

int
main (void)
{
#ifdef __BYTE_ORDER__
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  return u.b - 0x45678;
#else
  return u.b - 0x12345;
#endif
#endif
  return 0;
}