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

Måns Rullgård mans
Thu Aug 26 15:20:13 CEST 2010

Alex Converse <alex.converse at gmail.com> writes:

> 2010/8/26 M?ns Rullg?rd <mans at mansr.com>:
>> Janne Grunau <janne-ffmpeg at jannau.net> writes:
>>> On Thu, Aug 26, 2010 at 01:52:22AM -0400, Jason Garrett-Glaser wrote:
>>>> On Thu, Aug 26, 2010 at 12:44 AM, Eli Friedman <eli.friedman at gmail.com> wrote:
>>>> > Attached. ?This is essentially fixing an oversight in r21277.
>>>> >
>>>> > -Eli
>>>> This means every distro who uses --cpu=i686 or similar will silently
>>>> have their ffmpeg crippled the next time they make a build.
>>>> I would rather roll back r21277 than apply this patch.
>>> What about requriring --enable-runtime-cpudetect for i686 with mmx and
>>> crippling emms() in that case like attached patch?
>> I'm not changing a thing until someone shows me evidence of ffmpeg
>> actually being used on such CPUs.
> We shouldn't claim to support something that doesn't work.

But we _do_ support them.  Disable mmx and it will run on a 486 even.

M?ns Rullg?rd
mans at mansr.com

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