[FFmpeg-devel] AVX assembly for ffmpeg

[Måns Rullgård]

Daniel Kang <daniel.d.kang at gmail.com> writes:

> 2011/2/15 M?ns Rullg?rd <mans at mansr.com>
>
>> Daniel Kang <daniel.d.kang at gmail.com> writes:
>>
>> > I have been asked to write AVX assembly for ffmpeg. This will require
>> > porting x264's x86inc.asm file with the AVX abstraction layer. Ideally, I
>> > would like to bump the yasm version, as it is already checked for pextrd
>> > (SSE4). However, is this is not permissible, I can see if the AVX compile
>> > flag can be set conditionally, based on the yasm version.
>>
>> How recent a yasm version is required, and how hard is it to make it
>> conditional?
>>
>>
> yasm 0.7.0 is required. I have no experience with make files, so I am unsure
> how hard it would be to make it conditional. As 0.7.0 was released in 2008
> [1], I believe it is reasonable to bump the version.

That's ancient by our standards.  I'd be fine with updating the check to
require avx, but what about nasm?  There are apparently people using
nasm to build ffmpeg, and it would be a shame to drop support for that
unnecessarily.

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