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

Author: Gian-Carlo Pascutto

Date: 11:17:42 11/19/02

Go up one level in this thread


On November 19, 2002 at 14:11:18, Robert Hyatt wrote:

>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.

It seems intuitively obvious to Vincent that bitboards suck, but
I believe neither of you.

>Bitmaps seem to suffer _no_ performance penalty on
>X86 with 32 bits, compared to 0x88.

How do you determine this?

>Seems intuitively obvious to me that they will pick
>up speed on a machine that does 64 bit operations.

Not so obvious to me, I've posted a few issues with it
here before.

>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...

Doesn't say a thing. The programs are much more different than just
bitboard vs nonbitboard.

--
GCP



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