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Subject: Re: Bitscanning on the Opteron

Author: Robert Hyatt

Date: 11:18:30 12/05/03

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On December 05, 2003 at 08:52:10, Anthony Cozzie wrote:

>Three questions:
>
>1. What is the performance of the hardware bitscan, that is:
>
>__asm("bsf %0, %1")
>
>2. It would be very interesting to try again with the order of the masks
>changed.  Eugene's version has an easy time of it because of the order (I
>think).
>
>3. Has anyone worked on optimizing popcount/FindMSB for the hammer?
>
>anthony


Look at the "hyatt" results.   That uses BSR/BSF



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