Re: Linux 2.1 kernel patch --- update /dev/random driver.
Alexander Kjeldaas (astor@guardian.no)
Tue, 2 Jun 1998 19:40:25 +0200
On Mon, May 25, 1998 at 09:07:38PM -0400, Theodore Y. Ts'o wrote:
>
> What's currently implemented is much like ffs, except it only works up
> to 12 bits, since that's all we need. It may come as a surprise to some
> that it's faster to open-code it in C than to use the x86 bit scan
> instruction.
>
I am aware that the bs* instructions on the pentium are slow (don't
know about the PII though). However I do know that this operation is
done in 1 cycle in a normal PowerPC core.
astor
--
Alexander Kjeldaas, Guardian Networks AS, Trondheim, Norway
http://www.guardian.no/
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