[FFmpeg-devel] [PATCH] Fix configure to disable MMX for Pentium Pro
Thu Aug 26 19:16:06 CEST 2010
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
>> > 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.
> 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.
mans at mansr.com
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