[FFmpeg-devel] Does i686 have MMX?

Måns Rullgård mans
Sat Aug 28 23:43:28 CEST 2010

David Conrad <lessen42 at gmail.com> writes:

> 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.

The check as such still works, it's just not very meaningful.

M?ns Rullg?rd
mans at mansr.com

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