Re: ffmpeg: Please disable ASM-based optimizations on ppc64 as well

Hi Sean,

On Fri, 15 Aug 2025 20:27:03 -0400 Sean McGovern <[email protected]> wrote:
> This seems a bit heavy-handed on big-endian ppc64.
> 
> On this specific target, the only failing test is the AltiVec acceleration
> for lossless audio DSP.
> 
> The failure is annoyingly sporadic as well.

I'm not sure whether it's sporadic. ffmpeg hasn't built on ppc64 since October:

https://buildd.debian.org/status/logs.php?pkg=ffmpeg&arch=ppc64

> It might be more surgical to just remove
> libavcodec/ppc/lossless_audiodsp_altivec.c from the build (and it's
> correlating registration in libavcodec/lossless_audiodsp.c ). I'd be more
> than happy to prepare such a change and send a merge request if this is OK.

We're currently using a non-Altivec baseline on ppc64 if that matters.

> I can't speak for ppc64el as upstream currently lacks access to such
> equipment.

They can just test ppc64- and ppc64el-related changes on the GCC compile farm:

https://gcc.gnu.org/wiki/CompileFarm

FWIW, you can test any ppc64-related changes on perotto.debian.net.

Adrian

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