FFTW Interface Support

Developer Guide

Contents

FFTW Interface Support

 offers two collections of wrappers for the FFTW interface (www.fftw.org). The wrappers are the superstructure of FFTW to be used for calling the
Intel® oneAPI Math Kernel Library
 Fourier transform functions. These collections correspond to the FFTW versions 2.x and 3.x and the
Intel® oneAPI Math Kernel Library
 versions 7.0 and later.
These wrappers enable using
Intel® oneAPI Math Kernel Library
 Fourier transforms to improve the performance of programs that use FFTW without changing the program source code. See the "
FFTW Interface to
Intel® oneAPI
 Math Kernel Library
" appendix in the
Intel® oneAPI Math Kernel Library
 Developer Reference
 for details on the use of the wrappers.
For ease of use, the FFTW3 interface is also integrated in
Intel® oneAPI Math Kernel Library
.
The FFTW2 and FFTW3 interfaces are not compatible with each other. Avoid linking to both of them. If you must do so, first modify the wrapper source code for FFTW2:
  1. Change every instance of
    fftw_destroy_plan
     in the
    fftw2xc
     interface to
    fftw2_destroy_plan
    .
  2. Change all the corresponding file names accordingly.
  3. Rebuild the pertinent libraries.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.