[FFmpeg-devel] [PATCH v2] swscale/output: Altivec-optimize yuv2plane1_8

Michael Niedermayer michael at niedermayer.cc
Wed Nov 21 14:21:58 EET 2018


On Wed, Nov 21, 2018 at 10:12:48AM +0200, Lauri Kasanen wrote:
> > ./ffmpeg_g -f rawvideo -pix_fmt rgb24 -s hd1080 -i /dev/zero -pix_fmt yuv420p \
> > -f null -vframes 100 -v error -nostats -
> > 
> > 1158 UNITS in planar1,   65528 runs,      8 skips
> > 
> > -cpuflags 0
> > 
> > 19082 UNITS in planar1,   65533 runs,      3 skips
> > 
> > 16.48 speedup ratio. On x86, SSE2 is ~7. Curiously, the Power C version
> > takes as many cycles as the x86 SSE2 version, yikes it's fast.
> > 
> > Note that this function uses VSX instructions, but is not marked so.
> > This is because several existing functions also make that mistake.
> > I'll submit a patch moving them once this is reviewed.
> > 
> > v2: Remove !BE check
> > Signed-off-by: Lauri Kasanen <cand at gmx.com>
> 
> Ping. Seems not many ffmpeg devs interested in ppc.

have you tried "make fate" with this patch (note you need to configure with
fate samples" so all tests are run

thx

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

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
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