On Mon, Oct 24, 2016 at 9:59 PM, Ronald S. Bultje <rsbul...@gmail.com> wrote: > Good idea to reference Hendrik Gramner here, who keeps insisting we get rid > of all MMX code in ffmpeg (at least as an option) for future Intel CPUs in > which MMX will be deprecated.
Replacing MMX with SSE2 is indeed the most "proper" fix in my opinion, but it's a fair amount of work and not done in an evening. The fact that a lot of assembly lacks unit tests is certainly not helping in that regard. Some MMX instructions are slower than the equivalent SSE2 code on Skylake. Intel hasn't officially commented on (as far as I know at least) if we should expect this trend to continue, but they certainly seem to treat MMX as legacy. I doubt they would completely remove support for it though, backwards compatibility is a big selling-point for x86. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
