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I couldn't resist so I tried a table look-up (16 elements) version which was about twice as fast as the multiply version.

Intel Core i5-3210M @ 2.50GHz

Funny, I read about the first part of the sentence 'I tried a table look-up' and thought immediately WHAT ABOUT THE CACHE?

Then I continued '16 elements', oh, OK then, next time I'll try to read the whole sentence first.