linux-kernel - Re: Why ssse3?

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Date:	Thu, 3 May 2007 10:52:31 +0200
From:	Andi Kleen <ak@...e.de>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Why ssse3?

On Thursday 03 May 2007 00:56:26 Ulrich Drepper wrote:
> Andi Kleen wrote:
> > Nope. SSE3 != SSSE3. The additional S means Supplemential.
> > 
> > It's probably because the few changes didn't justify a SSE4
> 
> OK, the problem is that the actual sse3 bit is misnamed.  According to
> Intel's docs bit 0 of ECX is "sse", the kernel uses "pni".  Too bad.

PNI (Prescott New Instructions) was the original engineering code name. Unfortunately
it was added too early before the marketing name was known and then it couldn't be 
changed anymore.

-Andi

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