Speex dev - May 2020 - Speexdsp --enable-neon doesn't compile on 64bit

Complains about missing Int16 functionality.

So for 64bit on Arm you have to compile without –enable-neon and that has a huge
effect on the AEC functionality.
The Pi3 with neon is just struggling with the AEC routines as its audibly better
on a Pi4 but its not the garble that a Pi0 produces.
Without the neon on the Pi3 the 1.2 – 1.85 perf boost of neon with FFT is lost
and it really effects AEC effectiveness.
There are quite a number of low cost  ArmSocs now all approx. Pi3 level and
above that really benefit from neon support with FFT.

Arm have specific Libs for this
https://projectne10.github.io/Ne10/doc/modules.html

But since Version 3.3.1 FFTW http://www.fftw.org/ is supported Neon.

Probably the biggest applicable use of speexdsp is going to be excluded when
many opt for 64bit.

Stuart

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