does MKL FFT use pre-calculated twiddle factor table or calculates the twiddle factor when doing FFT?

[Wei_Z_Intel]

 Hi,

         I'm evaluating the MKL FFT performance, I have a quick question,  does MKL FFT use pre-calculated twiddle factor table or calculate the twiddle factor parallely when doing FFT?

Thank you

John

[Evarist_F_Intel]

Hi John,

MKL FFT precomputes twiddle factors during CommitDescriptor phase for minimizing overhead for DftiCompute function.

[Wei_Z_Intel]

Thanks a lot for the quick response.

John