Author: Vincent Diepeveen
Date: 16:47:14 06/06/02
Go up one level in this thread
On June 06, 2002 at 10:25:25, Robert Hyatt wrote: >On June 05, 2002 at 17:31:45, Gerd Isenberg wrote: > >>On June 05, 2002 at 13:22:30, Vincent Diepeveen wrote: >> >>>On June 05, 2002 at 04:14:41, Gerd Isenberg wrote: >>> >>>Gerd, a 33% speedup isn't much if you first slow down 2 times. >>>Right now the crafty datastructure is exactly 2 times slower doing >>>what i can do without bitboards. >>> >> >>Vincent, if, as you claim, bitboarders are two times slower per se on 32bit >>hardware, then i expect a speedup of >= 100% with bitboards on 64bit hardware. >> >>Gerd > > >This argument goes in circles, because he also claims they are not very >good on 64 bit machines either... Not really. the problem is the bitboarders have a different goal it seems. If all you want is a Sum(squaresattacked) as mobility function, then sure bitboards are an interesting thing to use at 64 bits processors. If you want more, then bad luck with bitboards. Factor 2 slower. At 64 bits processors 33% faster, still like 1.6 times slower. Best regards, Vincent
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