The first argument of ippsFFTInit is a double pointer to the FFT specification structure to be created. Do I need to call ippsFree() on *ppFFTSpec when I am done using it?
IppStatus ippsFFTInit_C_64f(IppsFFTSpec_C_64f** ppFFTSpec, int order, int flag, IppHintAlgorithm hint, Ipp8u* pSpec, Ipp8u* pSpecBuffer);
The parameter *ppFFTSpec points to the FFT specification structure that is located inside the allocated buffer pSpec. So the function ippsFree() should be called only for pSpec buffer, after using the pointer ppFFTSpec.
The example how to use FFTInit: https://software.intel.com/en-us/node/610221