From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] remove DEC Alpha DSP & support code
Date: Mon, 10 Jun 2024 15:07:14 +0200
Message-ID: <AS8P250MB0744C4585C11B5B4F6ACBE308FC62@AS8P250MB0744.EURP250.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <BC04060D-12A3-41B5-B061-47DEF9E3DC0C@remlab.net>
Rémi Denis-Courmont:
>
>
> 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.
>
I doubt that the same can be said about removing the fast 64bit and clz
flags.
- Andreas
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next prev parent reply other threads:[~2024-06-10 13:07 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-09 20:08 Sean McGovern
2024-06-10 11:57 ` Michael Niedermayer
2024-06-10 12:56 ` Rémi Denis-Courmont
2024-06-10 13:07 ` Andreas Rheinhardt [this message]
2024-06-10 13:14 ` Rémi Denis-Courmont
2024-06-11 9:35 ` Michael Niedermayer
2024-06-10 12:29 ` Michael Niedermayer
2024-06-10 12:42 ` Vittorio Giovara
2024-06-11 0:17 ` Michael Niedermayer
2024-06-11 0:52 ` Sean McGovern
2024-06-11 9:59 ` Michael Niedermayer
2024-06-11 11:26 ` Rémi Denis-Courmont
2024-06-11 13:39 ` Michael Niedermayer
2024-06-11 14:08 ` Sebastian Ramacher
2024-06-11 14:15 ` Vittorio Giovara
2024-06-13 16:32 ` Sean McGovern
2024-06-13 21:17 ` Vittorio Giovara
2024-06-14 6:26 ` Rémi Denis-Courmont
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