The computation step for some FFT algorithms requires a scratch space for permutation or other purposes. To manage the use of the auxiliary storage, Intel MKL provides the configuration parameter DFTI_WORKSPACE with the following values:
DFTI_ALLOW |
(default) Permits the use of the auxiliary storage. |
DFTI_AVOID |
Instructs Intel MKL to avoid using the auxiliary storage if it is practical. Otherwise, the library can use the auxiliary storage. |
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