FFT/IFFT algorithm acceleration from the hardware perspective. Apply TIE (Tensilica Instruction Extension) to configure the processor Xtensa developed by company Tensilica.
main.c : Input generate & Select the different implementations for FFT/IFFT
fft.h : Functions declaration & Macro definition
fft.c : Functions definitions & Precalculated Twiddle factors array "Sinewave[1024]".