[vorbis] MMX/3dNow! etc

Gian-Carlo Pascutto gcp at sjeng.org
Sat Sep 29 06:48:26 PDT 2001

On Sat, 29 Sep 2001, Andreas Karlsson wrote:

> Hi,
> I´m new on this list so I really don´t know that kind of questions have
> been asked, but here I go.
> Is the current ogg plug-ins using any mmx or 3dnow! instructions? Is there
> any performance to gain?

Segher is working on optimizing Vorbis, and currently
focussing on the decoding.

For now, it seems that the performance can be improved quite a bit
without having to revert to special multimedia instructions (which
aren't portable to other systems).

A simple way to take use of MMX/SSE/SSE2 would be to recompile
the Vorbis libraries with Intel C 5 with autovectorization enabled.

The gain would likely be negligible though.


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