[FFmpeg-devel] Does i686 have MMX?

David Conrad lessen42
Sat Aug 28 21:03:44 CEST 2010

On Aug 28, 2010, at 10:23 AM, M?ns Rullg?rd wrote:

> Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
>> On Sat, Aug 28, 2010 at 09:51:13AM +0100, M?ns Rullg?rd wrote:
>>> I was talking about mmx/sse/etc being treated specially compared to
>>> e.g. altivec or neon.
>> I'd like to mention that altivec is only special since we realized
>> we just can't properly test for altivec at runtime.
> But we do test for altivec at runtime on several operating systems,
> whether or not it makes sense.

Since "-maltivec -mabi=altivec" is the preferred flags for enabling Altivec and they're applied globally, the runtime check only works if you compile with an ancient Apple gcc.

More information about the ffmpeg-devel mailing list