Carry-propagation is expensive in modern CPUs because it reduces parallel processing, so adding 256-bit integers by switching to base-2**51 and deferring carry propagation until the end can counterintuitively be faster.
Carry-propagation is expensive in modern CPUs because it reduces parallel processing, so adding 256-bit integers by switching to base-2**51 and deferring carry propagation until the end can counterintuitively be faster.