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Subject: Re: IsiChessMMX without rotated BitBoards...

Author: Gian-Carlo Pascutto

Date: 13:01:22 10/14/02

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On October 14, 2002 at 12:46:55, Gerd Isenberg wrote:

>Hi all,
>
>as proposed some weeks ago, first conclusions of using Kogge-Stone and dumb7fill
>slideattack-generation with mmx-registers in IsiChess, which uses legal move
>generation with a kind of an infinite machine.
>
>IsiChessMMX is slightly but considerable faster on Athlon XP (but sucks on P4).

Two questions Gerd:

1) What was the slowdown after throwing out the rotated bitboards?

2) What is the gain after all changes?

Looks fascinating, but I'll probably hold off until I get a 64 bit chip.

--
GCP



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