[FFmpeg-devel] [PATCH] Fix configure to disable MMX for Pentium Pro

Michael Niedermayer michaelni
Thu Aug 26 21:53:44 CEST 2010

On Thu, Aug 26, 2010 at 08:52:24PM +0200, Reimar D?ffinger wrote:
> On Thu, Aug 26, 2010 at 01:37:06PM -0400, Alex Converse wrote:
> > > We should revert r24946: ?Disable MMX for i686 and pentiumpro
> > 
> > If something should be reverted it is dropping runtime detection for MMX
> At the very least I think it would be nice to be able to have SSE,
> does someone know out of their head why we have
> sse_deps="mmx"
> ? I always thought that at least in principle you could have and
> use SSE without MMX and that also would avoid the emms issue...

there is no cpu that supports SSE without MMX and if the features no
longer match the cpu then alot of assumtations of what is faster and
what cpus code will run on become wrong
its btw silly to disable mmx on a mmx cpu unless its for debuging or other
uncommon things

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No great genius has ever existed without some touch of madness. -- Aristotle
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