On Wed, 2008-10-29 at 13:49 -0400, Michael Williams wrote: > I am unable to explain the results.
It's just noise. Any code change can slightly help or hurt for no easily explainable reason. It could be some effect on caching, the optimizer, branch prediction, or something else. You do have a more complicated test now, based on a variable instead of a constant. It's hard to imagine that outweighs the cost of initializing an array however, although I think this kind of thing is really fast in modern processors (almost no branch mis-predictions, full pipe-lining, etc.) And this is the kind of change that even in a perfect world isn't going to have noticeable impact anyway. So if anything else changes it could actually slightly hurt. Even if it showed a slight speedup you could not for sure attribute this to the more efficient algorithm. - Don
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