Author: Steven Edwards
Date: 13:39:57 04/27/05
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On April 27, 2005 at 12:11:33, Matthew Hull wrote: >On April 27, 2005 at 12:04:58, Tord Romstad wrote: >>On April 27, 2005 at 11:29:07, John Sidles wrote: >>The PowerMac G5 is an awesome machine, but if the "ultimate desktop chess >>computer" is what you are looking for, you should look elsewhere. > >Unless someone could figure out how to use the vector processor for chess >knowledge. Bob did that on Cray machines, but the "altivec" type processor is >probably much more primitive and less flixible than the Cray. I spent some time with this a while back. Unfortunately, AltiVec (a coprocessor, really) doesn't have any instructions that are of interest to a typical chess program. It could be used for storing the entire AttackFrom bitboard array (exact fit, actually), but there is a relatively high time cost moving values between AltiVec and the rest of the CPU. AltiVec is rather fast moving stuff back and forth to memory however, and that's a big reason that AltiVec machines have such high PhotoShop benchmarks.
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