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Re:Bit permutations by AgentIcarus on Tuesday January 31, 2017 @02:07PM (#13534056)
If you enjoyed this you might also like http://www.hackersdelight.org and the associated book.
Re:Bit permutations by ingve on Tuesday January 31, 2017 @02:35PM (#13534383)
Bit Twiddling Hacks [0] is also good. (HN discussion: [1])

[0] https://graphics.stanford.edu/~seander/bithacks.html

[1] https://news.ycombinator.com/item?id=12026879