Nicely spotted. Though to be fair MPIR's assembly was improved using a superoptimiser and many more complex algorithms have assembly versions. It could take day

Nicely spotted. Though to be fair MPIR's assembly was improved using a superoptimiser and many more complex algorithms have assembly versions. It could take days for an inexperienced person to understand them. I hope to avoid that complexity (at the obvious loss of some performance) in bsdnt.