[FFmpeg-devel] SIMD Motion Compensation Optimizations

[AV Muppet]

On Monday, November 11th, 2024 at 3:12 AM, Rémi Denis-Courmont <remi at remlab.net> wrote:

> > I recently read a news article about impressive AVX-512 optimizations
> > of Motion Compensation functions and I'd like to learn more.
> > Unfortunately, the article merely linked the post on X, which
> > included a screenshot and little else.
> > 
> > https://x.com/FFmpeg/status/1852542388851601913
> 
> That's a screenshot of dav1d's checkasm, so you'll find the code in dav1d, not FFmpeg.

Thanks for the pointer.

I'd like to alert folks that the only way I could reproduce performance
numbers similar to theirs is when I built it with '-Dbuildtype=debug'.
Otherwise, the SIMD versions are all within the typical order of
magnitude vs. the generic C implementations you'd normally expect.

Again, I'm lacking any context concerning the original screen grab.
However, the actual text of the tweet appears to be highly misleading.

    "A 94x speed improvement demonstrated using handwritten assembly"