Author: Dan Andersson
Date: 08:09:38 05/18/01
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There are several issues to what word length does for chess program speed. Of course a 64 bit bitboard program will gain from running on such a machine, or at least should do that. But if you take an attack board (also a bit board) it fits perfectly inside 32 bit words, any more is wasteful. And then we have the fact that using smaller word lengths might be beneficial when we look at cache utilisation: Smaller data representation -> More data in cashe. I know that Christophe mentioned some such effect when rewriting CT to make it even more portable, for Palm et al. And a compression scheme in a 64 bit word machine could incur some overhead. And a RISC (and even a CISC) implementation of a 64 bit ISP makes the code less dense and thus may worsen cashe efficacy. Regards Dan Andersson
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