Author: Robert Hyatt
Date: 09:48:06 06/29/04
Go up one level in this thread
On June 29, 2004 at 12:28:03, Vincent Diepeveen wrote: >On June 29, 2004 at 11:56:05, Robert Hyatt wrote: > >>On June 29, 2004 at 11:25:08, Jaime Benito de Valle Ruiz wrote: >> >>>On June 29, 2004 at 08:26:15, Zach Wegner wrote: >>> >>>>One important point is that crafty uses bitboards, so it will have an additional >>>>speedup on a 64 bit processor. >>> >>>I might be wrong, but I think that Fritz also uses bitboards (I don't know about >>>Shredder). >>>Anyway, what about the compiler? And what extra efficiency do you expect from a >>>64-bit processor? Enough to outsearch all other engines running on similar >>>processors? >>> >>>Jaime >> >> >>AMD has tested Crafty to answer this question. They compiled it for 32 bits, >>and for 64 bits. The 64 bit version runs 47% faster than the 32 bit version, >>everything else remaining constant. > >Going from 32 to 64 bits also the number of registers moves up from 8 to 16 >which is a big speedup also for Crafty and is inside that 47%. Does not change their statement or measurement... And the question will be whether or not the commercial guys use a beta compiler to produce accesses to those extra registers. If, as you always claim, fritz is in ASM (rather than what Frans claims, that it was rewritten into pure C a couple of years back) then it won't be able to touch those registers either... Time will tell... > >>Fritz does not use bitboards by the way...
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