GSoC 2021 FFmpeg x86-64 assembly FFT

gsoc2021.md

https://gist.github.com/luc65r/fd31c3b5c2aab2eabeff08e126d6751b

Description

I wrote x86-64 SIMD versions of the following fast Fourier transforms to be used in libavutil

• https://gist.github.com/cyanreg/665b9c79cbe51df9296a969257f2a16c
• https://gist.github.com/cyanreg/bbf25c8a8dfb910ed3b9ae7663983ca6
• https://gist.github.com/cyanreg/a04716311ef19d28af9a5dba21e6c7ca
• https://gist.github.com/cyanreg/12b83d1ade1238b6e1af9901ad70852e

What needs to be done

• Finish the recombination function
• Try some more optimisations
• Get the code merged