Function Iadd

third-party/lua-5.5.0/src/lmathlib.c:441–446

return i1 + i2 */

/* return i1 + i2 */
static Rand64 Iadd (Rand64 i1, Rand64 i2) {
  Rand64 result = packI(i1.h + i2.h, i1.l + i2.l);
  if (trim32(result.l) < trim32(i1.l))  /* carry? */
    result.h++;
  return result;
}

/* return i * 5 */
static Rand64 times5 (Rand64 i) {