[FFmpeg-devel] [PATCH] PPC64: Add versions of functions in libswscale/input.c optimized for POWER8 VSX SIMD.

[Michael Niedermayer]

On Thu, Jul 07, 2016 at 07:14:43AM -0400, Ronald S. Bultje wrote:
> Hi,
> 
> On Thu, Jul 7, 2016 at 7:07 AM, Michael Niedermayer <michael at niedermayer.cc>
> wrote:
> 
> > On Wed, Jul 06, 2016 at 07:28:27AM -0500, Dan Parrot wrote:
> > > On Wed, 2016-07-06 at 09:07 +0200, Hendrik Leppkes wrote:
> > [...]
> >
> > >
> > > One other thing: why didn't this come up when the earlier patch was
> > > submitted and applied?
> >
> > community patch review is not a reproduceable process, depending on
> > who has time and does the review, different things can be found and
> > pointed out, and people have also different oppinions.
> > Real consistency can possibly only be achived by having an active
> > maintainer that does all review ...
> >
> > To be more precisse the other patch was applied due to this comment
> > IIRC:
> >  "If this patch works (FATE passes on ppc64) and is faster than
> >   the plain c functions then it can be committed as is"
> 
> 
> How much faster was it?

There where several benchmarks posted, one is here:
https://lists.ffmpeg.org/pipermail/ffmpeg-devel/2016-June/196022.html
it also contains some arguments why the speedup is less than on x86


> And how does that compare to typical sse2 x86
> speedups vs. c?
> 
> Ronald
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