[FFmpeg-devel] [PATCH] Add check for Athlon64 and similar AMD processors with slow SSE2.

Dominik 'Rathann' Mierzejewski dominik
Thu Feb 3 07:47:47 CET 2011

On Thursday, 03 February 2011 at 00:47, Justin Ruggles wrote:
> On 02/02/2011 06:40 PM, M?ns Rullg?rd wrote:
> > Why does this code only affect AMD processors?  I guess it has
> > something to do with those magic bit checks before it...
> That is a guess on my part.  I don't know much about cpuid.  I assume we
> wouldn't check for 3DNow on a non-AMD processor, but that may be an
> incorrect assumption.  x264 also checks the AMD vendor string in their
> equivalent of this whole section, but FFmpeg does not.

There are others, for example VIA C3 and IDT Winchip 2 (now VIA). I'm not
sure if they're worth worrying about, as they're probably too slow and
too scarce to matter.


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