[FFmpeg-devel] libavutil simd

[Reimar Döffinger]

Hello,
On Tue, Oct 02, 2007 at 05:26:57PM +1000, Nigel Pearson wrote:
> On 02/10/2007, at 2:54 PM, Alexander Strange wrote:
> > If you aren't linking to Carbon ("compatibility library"?), it's
> > available as a sysctl:
> > http://developer.apple.com/hardwaredrivers/ve/g3_compatibility.html
> >
> > int GetAltiVecTypeAvailable( void )
> > {
> >
> > int sels[2] = { CTL_HW, HW_VECTORUNIT };
> > int vType = 0; //0 == scalar only
> > size_t length = sizeof(vType);
> > int error = sysctl(sels, 2, &vType, &length, NULL, 0);
> > if( 0 == error ) return vType;
> >
> > return 0;
> >
> > }
> 
> I wish I had seen this a few hours ago!
> 
> 
> 1. Do we know that HW_VECTORUNIT is PowerPC only?
>     I fear that it may also be true for SSE.
> 
> 2. sysctlbyname("hw.optional.altivec"...)
>     is maybe easier to understand?

You know what's really funny about that?
We already use this code.
But it only works on OSX, so we have a different way so amiga and the
SIGILL hack for everything else.
And all of them are pointless because we compile with -maltivec and it
thus crashes anyway.

Greetings,
Reimar D?ffinger