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

[Måns Rullgård]

avcoder <ffmpeg at gmail.com> writes:

> On Thu, Aug 26, 2010 at 10:48 PM, Jason Garrett-Glaser <
> darkshikari at gmail.com> wrote:
>>
>> >
>> > The main point of the change was to get rid of the stupid global
>> > mm_flags variable.  We discussed it at length some time ago (it nearly
>> > went full bikeshed), and nobody objected then, not even the distro
>> people.
>> > Why the sudden outrage?
>>
>> Whether we like it or not, a huge number of people compile ffmpeg with
>> --cpu=i686 or similar for generic builds.  With these changes,
>> --cpu=i686 will actually SLOW DOWN ffmpeg as opposed to not specifying
>> CPU at all.  This is not intuitive behavior.
>>
>>
>  +1
>
> I love i686 for generic P6 architectures which support MMX.

But that is wrong.  i686 is by definition WITHOUT MMX.  Wishing,
desiring, or loving otherwise will not change this.

-- 
M?ns Rullg?rd
mans at mansr.com