We're working on JS audio decoders, and one huge performance issue atm is clz() [count leading zeroes], which is a very commonly used algorithm in decoders. We've tried several different approaches and benchmarked them [1], however, different approaches work better on different engines, so optimizing the function is a bit of a no-go, especially if we want to have it fast in the future as well.
So, I thought I'd propose something that would go well with the earlier proposals to extend Math [2]: Math.clz(number) This would allow for great speed boost in our decoders if it the JS engine had this built-in and optimized. While at it, it might be wise to add other related functions as well, such as clo (count leading ones), although not as useful. Cheers, Jussi [1]: http://jsperf.com/read-leading-zeros/8 [2]: http://wiki.ecmascript.org/doku.php?id=harmony:more_math_functions
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