FFT 라이브러리

[링크 : http://fftw.org/]

[링크 : https://stackoverflow.com/questions/5685765/computing-fft-and-if]

일단 3.3.5 에서 NEON 지원을 하는데 64비트 ARM일 경우에만 되는 듯?

FFTW 3.3.5 Jul 31, 2016

New SIMD support:

Power8 VSX instructions in single and double precision. To use, add --enable-vsx to configure.

Support for AVX2 (256-bit FMA instructions). To use, add --enable-avx2 to configure.

Experimental support for AVX512 and KCVI. (--enable-avx512, --enable-kcvi) This code is expected to work but the FFTW maintainers do not have hardware to test it.

Support for AVX128/FMA (for some AMD machines) (--enable-avx128-fma)

Double precision Neon SIMD for aarch64. This code is expected to work but the FFTW maintainers do not have hardware to test it.ft-with-fftw-library-c

[링크 : http://www.fftw.org/release-notes.html]

AArch64 was introduced in ARMv8-A and is included in subsequent versions of ARMV8-A

[링크 : https://en.wikipedia.org/wiki/ARM_architecture#AArch64_features]

[링크 : https://libav.org/]

[링크 : https://libav.org/documentation/doxygen/master/group__lavc__fft.html]

[링크 : https://www.ffmpeg.org/doxygen/trunk/fft-test_8c-source.html]

[링크 : https://stackoverflow.com/questions/8002560/what-is-the-fastest-fft-library-for-ios-android-arm-devices]