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Re: Better _MM_TRANSPOSE4_PS
- From: Richard Guenther <richard dot guenther at gmail dot com>
- To: Evan Cheng <evan dot cheng at apple dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Fri, 7 Oct 2005 09:18:35 +0200
- Subject: Re: Better _MM_TRANSPOSE4_PS
- References: <F9CC8347-0A62-499D-B0DB-93768A5AEFCA@apple.com>
- Reply-to: Richard Guenther <richard dot guenther at gmail dot com>
On 10/7/05, Evan Cheng <evan.cheng@apple.com> wrote:
> Hi,
>
> We would like to contribute a faster _MM_TRANSPOSE4_PS macro in
> config/i386/xmmintrin.h
>
> This version uses high / low moves and unpacks. It's 16% faster than
> the old version on current generation of Pentium 4 processors.
I'm curious if it makes any difference on AMD processors.
Richard.