[FFmpeg-devel] [PATCH 09/13] avcodec/svq1dec: clear MMX state after MB decode loop

u-9iep at aetey.se u-9iep at aetey.se
Wed Oct 26 17:52:09 EEST 2016

On Wed, Oct 26, 2016 at 04:21:14PM +0200, Hendrik Leppkes wrote:
> You can add "not caring about first-gen sse2 CPUs" to the list as
> well, if you want. Those are way old as well.
> There is going to be a performance loss either way, except that emms
> slows it down everywhere, while using sse2 is likely to be fine on
> modern CPUs. So IMHO thats the better course to take, if any.

Note that making MMX-acceleration unavailable would hurt at most on
those slowest, non-sse systems, which otherwise e.g. often struggle for
real-time decoding of heavier streams.

One of the highly appreciated virtues of ffmpeg is its efficiency,
this makes hardware much more useful. Please do not cut off the low
end systems when possible.


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