[FFmpeg-devel] [PATCH 2/2] Don't use CMOV in MMX code

Mikulas Patocka mikulas at artax.karlin.mff.cuni.cz
Sun Sep 14 01:04:32 CEST 2014

On Fri, 12 Sep 2014, Daniel Kang wrote:

> > All processors supporing mmx2 also support cmov, so if a test for mmx2 
> > succeeds, we can use cmov.
> Since I originally thought mmx => cmov (and apparently am wrong) is there official documentation supporting this?

There is no official documentation, it is just a historical fact.

MMX2 was introduced in Pentium 3 (it already has CMOV) and in Athlon (it 
also has CMOV).


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