Developer Reference

Contents

FFTW3 Interface to Intel® Math Kernel Library

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 FFTW3 wrappers provide a limited functionality compared to the original FFTW 3.x 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
.
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 )
See also these resources:
Intel® MKL
Release Notes
for the version of the FFTW3 library supported by the wrappers.
for a description of the FFTW interface.
for a description of the
Intel® MKL
FFT interface.
for a description of
Intel® MKL
TT interface.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804