Developer Reference

Contents

Creating the Wrapper Library

Two header files are used to compile the C wrapper library:
fftw2_mkl.h
and
fftw.h
. The
fftw2_mkl.h
file is located in the
.\interfaces\fftw2xc\wrappers
subdirectory in the
Intel® oneAPI Math Kernel Library
directory.
The file
fftw.h
, used to compile libraries and located in the
.\include\fftw
subdirectory in the
Intel® oneAPI Math Kernel Library
directory, slightly differs from the original FFTW (www.fftw.org) header file
fftw.h
.
The source code for the wrappers, makefiles, and files with lists of functions are located in the
.\interfaces\fftw2xc
subdirectory in the
Intel® oneAPI Math Kernel Library
directory.
A wrapper library contains wrappers for complex and real transforms in a serial and multi-threaded mode for double- or single-precision floating-point data types. A makefile parameter manages the data type.
Parameters of a makefile also specify the platform (required), compiler, and data precision. The makefile comment heading provides the exact description of these parameters.
To build the library, run the
make
command on Linux* OS and macOS* or the
nmake
command on Windows* OS with appropriate parameters.
For example, on Linux OS the command
make libintel64
builds a double-precision wrapper library for Intel® 64 architecture based applications using the
Intel® oneAPI
DPC++/C++
Compiler
or the Intel® Fortran Compiler (Compilers and data precision are chosen by default.)
Each makefile creates the library in the directory with
Intel® oneAPI Math Kernel Library
libraries corresponding to the platform used. For example,
./lib/ia32
(on Linux OS and macOS) or
.\lib\ia32
(on Windows* OS).
In the names of a wrapper library, the suffix corresponds to the compiler used and the letter preceding the underscore is
"c"
for the C
programming language.
For example,
fftw2xc_intel.lib
(on Windows OS);
libfftw2xc_intel.a
(on Linux OS and macOS);
fftw2xc_ms.lib
(on Windows OS);
libfftw2xc_gnu.a
(on Linux OS and macOS).

Product and Performance Information

1

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