Re: Bug#1108731: ffmpeg: Please disable ASM-based optimizations on ppc64 as well

[Sean McGovern <gseanmcg@gmail.com>]

Hi,

On Mon, Aug 18, 2025 at 5:13 PM John Paul Adrian Glaubitz
<glaubitz@physik.fu-berlin.de> wrote:
>
> Hi Sean,
>
> On Fri, 15 Aug 2025 20:27:03 -0400 Sean McGovern <gseanmcg@gmail.com> 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

The failing 'checkasm-sw_yuv2rgb' test was new for FFmpeg 7.1 and
indeed I don't think that one is sporadic.
Unfortunately at the time, upstream was not running the test suite on
32- or 64-bit PowerPC (or any big-endian configuration either).

'checkasm-llauddsp' is the one that can fail sporadically and I
suspect it just doesn't run often enough to observe the failure on
buildd.
We see it very often upstream.

-- Sean McGovern