[FFmpeg-devel] [PATCH v2] swscale/output: Altivec-optimize float yuv2plane1

[Michael Niedermayer]

On Mon, Dec 24, 2018 at 07:39:18PM +0200, Lauri Kasanen wrote:
> On Sun, 16 Dec 2018 11:06:53 +0200
> Lauri Kasanen <cand at gmx.com> wrote:
> 
> > This function wouldn't benefit from VSX instructions, so I put it
> > under altivec.
> > 
> > ./ffmpeg_g -f rawvideo -pix_fmt rgb24 -s hd1080 -i /dev/zero -pix_fmt grayf32le \
> > -f null -vframes 100 -v error -nostats -
> > 
> > 3743 UNITS in planar1,   65495 runs,     41 skips
> > 
> > -cpuflags 0
> > 
> > 23511 UNITS in planar1,   65530 runs,      6 skips
> > 
> > grayf32be
> > 
> > 4647 UNITS in planar1,   65449 runs,     87 skips
> > 
> > -cpuflags 0
> > 
> > 28608 UNITS in planar1,   65530 runs,      6 skips
> > 
> > The native speedup is 6.28133, and the bswapping one 6.15623.
> > Fate passes, each format tested with an image to video conversion.
> > 
> > Signed-off-by: Lauri Kasanen <cand at gmx.com>
> > ---
> > 
> > Tested on POWER8 LE. Testing on earlier ppc and/or BE appreciated.
> > 
> > v2: Added #undef vzero, that define broke the build on older gcc. Thanks Michael
> 
> Ping. And of course it's not gcc version dependant, but rather it was
> the BE ifdef; it was too early in the morning.

seems working, will apply

thx

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

Rewriting code that is poorly written but fully understood is good.
Rewriting code that one doesnt understand is a sign that one is less smart
then the original author, trying to rewrite it will not make it better.
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