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

Wei_Z_Intel
Employee
‎02-24-2015 10:25 PM
878 Views

 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

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Evarist_F_Intel
Employee
‎02-24-2015 10:59 PM
878 Views

Hi John,

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

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Wei_Z_Intel
Employee
‎02-24-2015 11:04 PM
878 Views

Thanks a lot for the quick response.

 

John

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