[Pixman] [PATCH 0/3] ARM NEON optimizations for better results in cairo-perf benchmarks

[Siarhei Siamashka]

On Thursday 25 February 2010, Koen Kooi wrote:
> On 24-02-10 05:04, Siarhei Siamashka wrote:
> > The following patches add some new 32bpp ARM NEON optimized fast paths
> > for the operations which are heavily used in the standard cairo-perf
> > benchmarks. Profiling statistics has been posted earlier:
> > http://people.freedesktop.org/~siamashka/files/20100216/pixman-0.17.6
> >
> > A git branch with the same patches is also available here:
> > http://cgit.freedesktop.org/~siamashka/pixman/log/?h=neon-cairo-perf-spee
> >dup
> >
> > Siarhei Siamashka (3):
> >   ARM: added 'neon_composite_over_n_8888_8888_ca' fast path
> >   ARM: added 'neon_composite_src_x888_8888' fast path
> >   ARM: added 'neon_composite_over_reverse_n_8888' fast path
> >
> >  pixman/pixman-arm-neon-asm.S |  200
> > ++++++++++++++++++++++++++++++++++++++++++ pixman/pixman-arm-neon.c     |
> >    9 ++
> >  2 files changed, 209 insertions(+), 0 deletions(-)
>
> Wow, I went from 0.17.3 + overlapped blt to 0.17.8 + overlapped blt +
> these three patches and the performance improvement on OMAP3xxx and
> DM3xxx is HUGE! For example the GNOME start menu pops up a lot faster,
> making it feel nice and snappy.

Thanks for giving these patches a try. I hope it is not just a placebo
effect :)

If you really care about GNOME start menu pop up performance, a good idea
would be to get some oprofile logs for it and make sure that there are no
slow paths hit in pixman.

Also if you can generate some cairo-perf traces for the (32bpp) use cases
which are important for you, I could also try to make sure that they are all
NEON optimized properly. That's the current way of improving graphics
performance. Introducing an universal and efficient JIT for NEON may change
this later.

-- 
Best regards,
Siarhei Siamashka