[FFmpeg-devel] [PATCH v6] libswscale/ppc: VSX-optimize 9-16 bit yuv2planeX

[Michael Niedermayer]

On Sun, Jan 13, 2019 at 10:26:20AM +0200, Lauri Kasanen wrote:
> ./ffmpeg_g -f rawvideo -pix_fmt rgb24 -s hd1080 -i /dev/zero -pix_fmt yuv420p16be \
> -s 1920x1728 -f null -vframes 100 -v error -nostats -
> 
> 9-14 bit funcs get about 6x speedup, 16-bit gets about 15x.
> Fate passes, each format tested with an image to video conversion.
> 
> Only POWER8 includes 32-bit vector multiplies, so POWER7 is locked out
> of the 16-bit function. This includes the vec_mulo/mule functions too,
> not just vmuluwm.
> 
> With TIMER_REPORT skips disabled:
> yuv420p9le
>   12412 UNITS in planarX,  131072 runs,      0 skips
>   73136 UNITS in planarX,  131072 runs,      0 skips
> yuv420p9be
>   12481 UNITS in planarX,  131072 runs,      0 skips
>   73410 UNITS in planarX,  131072 runs,      0 skips
> yuv420p10le
>   12322 UNITS in planarX,  131072 runs,      0 skips
>   72546 UNITS in planarX,  131072 runs,      0 skips
> yuv420p10be
>   12291 UNITS in planarX,  131072 runs,      0 skips
>   72935 UNITS in planarX,  131072 runs,      0 skips
> yuv420p12le
>   12316 UNITS in planarX,  131072 runs,      0 skips
>   72708 UNITS in planarX,  131072 runs,      0 skips
> yuv420p12be
>   12319 UNITS in planarX,  131072 runs,      0 skips
>   72577 UNITS in planarX,  131072 runs,      0 skips
> yuv420p14le
>   12259 UNITS in planarX,  131072 runs,      0 skips
>   72516 UNITS in planarX,  131072 runs,      0 skips
> yuv420p14be
>   12440 UNITS in planarX,  131072 runs,      0 skips
>   72962 UNITS in planarX,  131072 runs,      0 skips
> yuv420p16le
>   10548 UNITS in planarX,  131072 runs,      0 skips
>   73429 UNITS in planarX,  131072 runs,      0 skips
> yuv420p16be
>   10634 UNITS in planarX,  131072 runs,      0 skips
>  150959 UNITS in planarX,  131072 runs,      0 skips
> 
> Signed-off-by: Lauri Kasanen <cand at gmx.com>
> ---
>  libswscale/ppc/swscale_ppc_template.c |   4 +-
>  libswscale/ppc/swscale_vsx.c          | 186 +++++++++++++++++++++++++++++++++-
>  2 files changed, 184 insertions(+), 6 deletions(-)
> 
> v6: No patch changes, updated bench numbers without skips.

fate does not get worse from this patch on qemu ppc32be and ppc64le 


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

If you fake or manipulate statistics in a paper in physics you will never
get a job again.
If you fake or manipulate statistics in a paper in medicin you will get
a job for life at the pharma industry.
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