Author: Dan Newman
Date: 22:10:33 01/29/01
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On January 30, 2001 at 00:38:34, Landon Rabern wrote: > >Have you tried it with rotated bitboards recently to see if you get any >improvement. Also, have you looked into using the MMX registers? I am getting >about a 35% speedup using MMX. > >Regards, > >Landon I've never done a full implementation of rotated bitboards, just enough on my first pass at it to decide not to do it on the second go round :). It is on my list of things I'd like to try though. I feel fairly sure that it will slow me down, but I can't really know without trying it... I haven't looked into MMX much yet, but that's on my list too :). I once tried doing the eval in floating point with the idea that those calculations could proceed in parallel with other stuff. I didn't get any speedup, but I don't recall there was much of hit either. I think I did that on a 25 MHz 486 though, so it might actually work now on a P3 or whatever. It may be I just didn't have enough integer stuff going on simultaneously. Of course that idea is somewhat incompatible with using those registers for MMX stuff... -Dan.
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