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Subject: Re: bsf in amd64

Author: Gerd Isenberg

Date: 04:13:07 12/02/05

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On December 01, 2005 at 17:13:32, Alessandro Scotti wrote:

>On December 01, 2005 at 16:45:22, Mridul Muralidharan wrote:
>
>>Might be asking for too much , but just wondering if anyone has already ported
>>leadz/trailz for it in an efficient manner (I do have some fallback non-asm code
>>, but i suspect it is way too slow).
>
>Look for the routines by Gerd Isenberg... they may be even faster than the asm
>code!

Hi Alessandro,

guess you mean the folded DeBruijn routine by Matt Taylor.
Or also Walter Faxon's trailing zero count.
I promoted those routines - but don't like to adorn myself with borrowed plumes.

Thanks,
Gerd




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