Benchmarks comparing against other FFT impls (FFTW etc)

[daniel-emotech]

FFTW is reportedly the fastest open source fast Fourier transform implementation so it would be interesting to see how RustFFT compares against it as well as Intel's MKL FFT and clFFT.

[oleid]

Here are benchmarks, which compare this create, fftw and Fourier

https://github.com/calebzulawski/fourier/tree/master/fourier-bench

[Boscop]

@daniel-emotech FFTS claims to be faster than FFTW: https://github.com/anthonix/ffts

[skewballfox]

There is also this paper comparing fftw and rustfft on a pi zero and Pi 4. I'm still trying to find the code for this if it's on the public web.