Interesting links on bit manipulation: <a href="http://inwap.com/pdp10/hbaker/hakmem/hakmem.html">hakmem</a>, <a href="http://www.amazon.com/Hackers-Delight-Henry-S-Warren/dp/0201914654">delight</a>, <a href="http://www.cl.cam.ac.uk/~am21/hakmemc.html">hakmem-update</a>