Author: Robert Hyatt
Date: 04:37:44 06/08/98
Go up one level in this thread
On June 08, 1998 at 07:17:08, Vincent Diepeveen wrote: > >On June 05, 1998 at 21:48:57, Robert Hyatt wrote: > >>On June 05, 1998 at 17:47:07, Bruce Moreland wrote: >> >>> >>>On June 05, 1998 at 08:53:53, Ernst A. Heinz wrote: >>> >>>>BTW, we have been waiting to get our hands on a Alpha-21264 for roughly >>>>a year because "DarkThought" will hopefully speed up as much on them >>>>as "Crafty". >>> >>>What percentage of execution time do you and Bob spend doing these >>>operations, do you think? >>> >>>bruce >> >>FindFirstOne() = 1-2% in crafty. popcnt is much less... so that won't >>help a whole lot. but the 64 bit stuff helps in general... > >Well that doesn't say anything concrete. > >More important is the overall delay. > >At a P133 intel the speed difference between crafty's move generator >and diep's move generator is somewhat more than 3 times. > >Crafty is more than 3 times slower, because of bitboards, which perform >badly at 32 bits. Note that the more possibilities, this 3 times will >become >4 times. > >For something taking 1 clockcycle in my program and which can >be even pipelined in U + V pipe, >crafty needs sometimes even a whole function. > >Greetings, >Vincent yes... but try to generate nothing but captures and compare that, which is a major part of the total tree search...
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