This section describes a collection of FFTW3 wrappers to Intel MKL. The wrappers translate calls of FFTW3 functions to the calls of the Intel MKL Fourier transform (FFT) or Trigonometric Transform (TT) functions. The purpose of FFTW3 wrappers is to enable developers whose programs currently use the FFTW3 library to gain performance with the Intel MKL Fourier transforms without changing the program source code.
The wrappers correspond to the FFTW release 3.2 and the Intel MKL releases starting with 10.2. For a detailed description of FFTW interface, refer to www.fftw.org. For a detailed description of Intel MKL FFT and TT functionality the wrappers use, see Fourier Transform Functions and Trigonometric Transform Routines, respectively.
The FFTW3 wrappers provide a limited functionality compared to the original FFTW 3.2 library, because of differences between FFTW and Intel MKL FFT and TT functionality. This section describes limitations of the FFTW3 wrappers and hints for their usage. Nevertheless, many typical FFT tasks can be performed using the FFTW3 wrappers to Intel MKL. More functionality may be added to the wrappers and Intel MKL in the future to reduce the constraints of the FFTW3 interface to Intel MKL.
The FFTW3 wrappers are integrated in Intel MKL. The only change required to use Intel MKL through the FFTW3 wrappers is to link your application using FFTW3 against Intel MKL.
A reference implementation of the FFTW3 wrappers is also provided in open source. You can find it in the interfaces directory of the Intel MKL distribution. You can use the reference implementation to create your own wrapper library (see Building Your Own Wrapper Library)
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