The Variable-precision SWAR Algorithm

Obligatory: <a href="http://graphics.stanford.edu/~seander/bithacks.html" rel="nofollow">http://graphics.stanford.edu/~seander/bithacks.html</a><p>And don't miss Hacker's delight, either: <a href="http://www.hackersdelight.org/" rel="nofollow">http://www.hackersdelight.org/</a>