http://graphics.stanford.edu/~seander/bithacks.html http://graphics.stanford.edu/~seander/bithacks.html Entertaining book: http://www.amazon.co.uk/Hackers-Deli

http://graphics.stanford.edu/~seander/bithacks.html http://graphics.stanford.edu/~seander/bithacks.html Entertaining book: http://www.amazon.co.uk/Hackers-Delight-2nd-Edition-ebook/dp/B009GMUMTM/ref=sr_1_1?ie=UTF8&qid=1370694434&sr=8-1&keywords=hackers+delight http://www.amazon.co.uk/Hackers-Delight-2nd-Edition-ebook/dp... The reference: http://www.amazon.co.uk/The-Computer-Programming-Vol-Combinatorial/dp/0201038048/ref=sr_1_2?ie=UTF8&qid=1370694506&sr=8-2&keywords=knuth+4a http://www.amazon.co.uk/The-Computer-Programming-Vol-Combina... Section 7.1.3 Bitwise Tricks and Techniques