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cannam@167: <title>FFTW 3.3.8: Generating your own code</title>
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cannam@167: Previous: <a href="Cycle-Counters.html#Cycle-Counters" accesskey="p" rel="prev">Cycle Counters</a>, Up: <a href="Installation-and-Customization.html#Installation-and-Customization" accesskey="u" rel="up">Installation and Customization</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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cannam@167: <a name="Generating-your-own-code-1"></a>
cannam@167: <h3 class="section">10.4 Generating your own code</h3>
cannam@167: <a name="index-code-generator-1"></a>
cannam@167:
cannam@167: <p>The directory <code>genfft</code> contains the programs that were used to
cannam@167: generate FFTW’s “codelets,” which are hard-coded transforms of small
cannam@167: sizes.
cannam@167: <a name="index-codelet-2"></a>
cannam@167: We do not expect casual users to employ the generator, which is a rather
cannam@167: sophisticated program that generates directed acyclic graphs of FFT
cannam@167: algorithms and performs algebraic simplifications on them. It was
cannam@167: written in Objective Caml, a dialect of ML, which is available at
cannam@167: <a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>.
cannam@167: <a name="index-Caml"></a>
cannam@167: </p>
cannam@167:
cannam@167: <p>If you have Objective Caml installed (along with recent versions of
cannam@167: GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you
cannam@167: can change the set of codelets that are generated or play with the
cannam@167: generation options. The set of generated codelets is specified by the
cannam@167: <code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add
cannam@167: efficient REDFT codelets of small sizes by modifying
cannam@167: <code>rdft/codelets/r2r/Makefile.am</code>.
cannam@167: <a name="index-REDFT-2"></a>
cannam@167: After you modify any <code>Makefile.am</code> files, you can type <code>sh
cannam@167: bootstrap.sh</code> in the top-level directory followed by <code>make</code> to
cannam@167: re-generate the files.
cannam@167: </p>
cannam@167: <p>We do not provide more details about the code-generation process, since
cannam@167: we do not expect that most users will need to generate their own code.
cannam@167: However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if
cannam@167: you are interested in the subject.
cannam@167: </p>
cannam@167: <a name="index-monadic-programming"></a>
cannam@167: <p>You might find it interesting to learn Caml and/or some modern
cannam@167: programming techniques that we used in the generator (including monadic
cannam@167: programming), especially if you heard the rumor that Java and
cannam@167: object-oriented programming are the latest advancement in the field.
cannam@167: The internal operation of the codelet generator is described in the
cannam@167: paper, “A Fast Fourier Transform Compiler,” by M. Frigo, which is
cannam@167: available from the <a href="http://www.fftw.org">FFTW home page</a> and also
cannam@167: appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on
cannam@167: Programming Language Design and Implementation (PLDI)</cite>.
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