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Subject: Re: Bitboards: must I rotate ?

Author: Robert Hyatt

Date: 21:23:07 05/11/02

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On May 11, 2002 at 05:48:17, Matthias Gemuh wrote:

>
>Hi Experts,
>how much faster can I compute attacks when I rotate ? 5%? 20%? 50%?
>I don't understand rotation and hope the gain is 1% speed boost :-).
>Regards,
>Matthias.

It is more than that.  The main thing is that it eliminates the loop needed
to find where a particular diagonal, file or rank is blocked.  Generating
the attacks on a particular "ray" becomes a simple table lookup...

• Re: Bitboards: must I rotate ? Matthias Gemuh 23:53:12 05/11/02
  • Re: Bitboards: must I rotate ? Alessandro Damiani 03:49:08 05/12/02
    • Re: Bitboards: must I rotate ? Matthias Gemuh 04:45:55 05/12/02
      • Re: Bitboards: must I rotate ? Alessandro Damiani 08:09:46 05/12/02
  • Re: Bitboards: must I rotate ? Tim Foden 02:34:48 05/12/02
    • Re: Bitboards: must I rotate ? Matthias Gemuh 04:29:12 05/12/02
      • Re: Bitboards: must I rotate ? Tim Foden 12:31:28 05/12/02
        • Re: Bitboards: must I rotate ? Matthias Gemuh 01:22:24 05/13/02
  • Re: Bitboards: must I rotate ? Matthias Gemuh 00:09:42 05/12/02

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