Author: Keith Evans
Date: 11:32:43 06/20/02
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On June 20, 2002 at 13:30:28, Eugene Nalimov wrote: >Such the experiment will answer the question: "On the 64-bit architecture, how >much speedup is caused by the 64-bittness"? I.e. let's imagine 32-bit Alpha or >Itanium2. How slower Crafty will be on such the animal? > >I suspect that the difference will be only ~10%. I.e. Alpha and Itanium2 run >Crafty well not because it uses 64-bit data structures, but because they run >everything well. > >Unfortunately, suggested experiment is flawed. Lot of compilers will generate >much worse code for the operations with structures than for the operations with >the builtin types. > >Eugene > But if the 32-bit datastructures perform _better_ than Bob predicts, despite the "much worse code", then the experimental results could still be useful. I agree that if the performance of the 32-bit datastructures is significantly lower (matching Bob's prediction) then we won't be able to say whether it's due to the compiler or just the 32-bit widths. Of course this may not motivate Bob to perform the experiment, because it can only show that his 64-bit bitboard performance claims are a bit exagerrated. If it's in the other direction then the argument will continue. We can only hope that a scientifically minded new chess engine author who is considering the use of bitboards will do some experimentation on these new processors and share the results. -Keith
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