Computer Chess Club Archives




Subject: Re: Differences between 0x88 ,10x12 and Bitboards!?

Author: Gian-Carlo Pascutto

Date: 14:07:41 11/19/02

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On November 19, 2002 at 16:48:55, Robert Hyatt wrote:

>That is a 40% improvement if I did my math right.  Which is in line
>with what most knowledgable people claim a bitmap program should do since not
>all instructions need 64 bits of data (branches, loop counters, a few others).

If I remember correctly, the 'speedup' of Crafty when running
on 64-bit hardware vs. the one of normal programs wasn't remotely
close to 40%. (I'm basing this on SPEC results)

It's been observed that different pro's got different speedups
when SSDF switched from AMD K6 450 to Athlon 1200's as well.

The design of the program can benefit or get a penality from
a new platform by other effects than just the board representation.


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