Re: [Discuss-gnuradio] libvolk NEON support progress update

This really is great work, Albin! Thanks so much for sharing your work and keeping the community posted on your progress!

And wow, the speedup on the rotator is impressive. I'm really looking forward to your work getting upstreamed =)

Cheers,

Ben

On Tue, May 7, 2019 at 12:50 PM Martin Braun <martin.braun@ettus.com> wrote:

Very cool! Looking forward to your PR!

On Tue, May 7, 2019 at 7:04 AM Albin Stigö <albin.stigo@gmail.com> wrote:

Hi,

Just a quick progress update. I have completed NEON support for 34 out
of 74 libvolk kernels that were missing NEON implementations.

Average speedup is around 4x depending on kernel, not very surprising
since NEON SIMD vector size for float32 is 4...

Biggest surprise was volk_32fc_s32fc_x2_rotator_32fc that now is 14x
faster on Raspberry Pi 3b. This is nice because this kernel is used in
the frequently used (pun intended) Frequency Xlating FIR Filter.

https://github.com/gnuradio/volk/issues/243

So far kernels are only available in my (messy) branch but I will
gradually create pull requests into libvolk.


--Albin

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