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Date: Mon, 28 Jun 2010 13:33:21 +0400
From: Solar Designer <>
Subject: Re: faster DES on Atom

A minor correction:

On Mon, Jun 28, 2010 at 01:15:55PM +0400, Solar Designer wrote:
> ... when working on this code in 2006 I only encountered CPUs that
> executed both SSE and SSE2 versions of the code at the same speed (AMD
> CPUs) and those that executed the SSE2 code much faster (Intel CPUs),
> which is why the decision to go with SSE2 only was made.

I think I managed to recall the specific CPU classes mentioned in braces
above incorrectly.  Plain SSE only performed well on Intel Pentium 4
(and on P4'ish Xeon and Celeron).  Both AMD and non-P4 Intel CPUs ran
SSE2 faster than plain SSE (speaking of bitwise ops only, indeed).


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