topic does MKL FFT use pre-calculated twiddle factor table or calculates the twiddle factor when doing FFT? in Intel® oneAPI Math Kernel Library

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

Wei_Z_Intel — Wed, 25 Feb 2015 06:25:26 GMT

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

Hi Wei,

Evarist_F_Intel — Wed, 25 Feb 2015 06:59:00 GMT

Hi John,

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

Thanks a lot for the quick

Wei_Z_Intel — Wed, 25 Feb 2015 07:04:01 GMT

Thanks a lot for the quick response.

John