[FFmpeg-devel] AVX assembly for ffmpeg

[Daniel Kang]

2011/2/15 M?ns Rullg?rd <mans at mansr.com>

> "Ronald S. Bultje" <rsbultje at gmail.com> writes:
>
> > Hi,
> >
> > On Tue, Feb 15, 2011 at 3:27 PM, Reimar D?ffinger
> > <Reimar.Doeffinger at gmx.de> wrote:
> >> On Tue, Feb 15, 2011 at 08:12:13PM +0000, M?ns Rullg?rd wrote:
> >>> 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?
> >>
> >> Note that I promised to not burden other people with it, but I'd
> appreciate
> >> it if you could also look into/try not to break nasm :-)
> >
> > HAVE_AVX isn't that difficult to implement now that we have
> > config.asm.
>
> That part is trivial, I was thinking of the asm code itself.
>
> > Let's go the conditional route, at least for now.
>
> Sure, that way nobody has cause for complaints.


I will send a patch with a sample AVX function implemented for comments
soon.