Re: [FFmpeg-devel] remove DEC Alpha DSP & support code

[Michael Niedermayer <michael@niedermayer.cc>]

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On Mon, Jun 10, 2024 at 03:56:46PM +0300, Rémi Denis-Courmont wrote:
> 
> 
> Le 10 juin 2024 14:57:29 GMT+03:00, Michael Niedermayer <michael@niedermayer.cc> a écrit :
> >Also we have alpha fate clients:
> >https://fate.ffmpeg.org/?query=subarch:alpha%2F%2F
> 
> Are there? I only see Ubuntu 22.04 builds which must be cross-compiled since Ubuntu 22.04 doesn't support DEC Alpha, not even as a port.
> 
> So I guess the tests are run on user-mode QEMU? For the sake of the argument and to answer your performance question, SIMD on QEMU is in my experience much *slower* than scalar C, due to limitations of TCG. So if that's the goal post, then removing the optimisations is actually a performance win.

My performance question was not related to the fate clients. (though they could be affected too)
As i wrote "(this allows users to judge if they want to stay on a old ffmpeg with these optimizations or upgrade)"

The fate clients are not real users nor am i

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Asymptotically faster algorithms should always be preferred if you have
asymptotical amounts of data

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