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

Author: Robert Hyatt

Date: 11:11:18 11/19/02

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On November 19, 2002 at 12:25:11, Gian-Carlo Pascutto wrote:

>On November 19, 2002 at 11:35:24, Robert Hyatt wrote:
>
>>Bitboards have a bit of a performance advantage on 64 bit processors,
>
>Proof?
>
>--
>GCP

Counter-proof?

Seems intuitively obvious to me.  Bitmaps seem to suffer _no_ performance
penalty on
X86 with 32 bits, compared to 0x88.  Seems intuitively obvious to me that they
will pick
up speed on a machine that does 64 bit operations.

Bruce and I did this comparison when he used the alpha in the WMCCC (1997 I
think).

He re-compiled ferret for the alpha, did the same for Crafty.  My speed
improvement was
significantly better than his on the _same_ machine.  Because of the 64 bit
stuff.  His program
didn't need any 64 bit stuff so it was wasted...

Best "proof" is to try it.  I have...




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