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Subject: Re: Bitboard question

Author: Russell Reagan

Date: 11:21:44 05/25/02

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On May 25, 2002 at 14:11:01, Gian-Carlo Pascutto wrote:

>What do you mean by 'stable and reliable?' Either it works or it does not...

I was referring to your statement about how the shift operation was predictable
and the if statement was not. I assumed you meant that in an if-statement, the
contents of the expressing being evaluated could be anything, and therefore the
shift/AND sequence is more "stable" and "reliable" than the add/if-test
sequence. That's what I thought you meant. If so, that would qualify as an
advantage to th e shift/AND method, but as far as I can tell, you're just
accomplishing the ray tracing by a different method (IE doing a shift/AND
instead of an add/if-test). So using bitboards for things like attacks and
mobility isn't "free".

Russell



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