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Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
cannam@127 7
cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@127 10 Permission is granted to make and distribute verbatim copies of this
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cannam@127 25 <title>FFTW 3.3.5: Generating your own code</title>
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cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="Generating-your-own-code"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 75 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> &nbsp; [<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>
cannam@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="Generating-your-own-code-1"></a>
cannam@127 79 <h3 class="section">10.4 Generating your own code</h3>
cannam@127 80 <a name="index-code-generator-1"></a>
cannam@127 81
cannam@127 82 <p>The directory <code>genfft</code> contains the programs that were used to
cannam@127 83 generate FFTW&rsquo;s &ldquo;codelets,&rdquo; which are hard-coded transforms of small
cannam@127 84 sizes.
cannam@127 85 <a name="index-codelet-2"></a>
cannam@127 86 We do not expect casual users to employ the generator, which is a rather
cannam@127 87 sophisticated program that generates directed acyclic graphs of FFT
cannam@127 88 algorithms and performs algebraic simplifications on them. It was
cannam@127 89 written in Objective Caml, a dialect of ML, which is available at
cannam@127 90 <a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>.
cannam@127 91 <a name="index-Caml"></a>
cannam@127 92 </p>
cannam@127 93
cannam@127 94 <p>If you have Objective Caml installed (along with recent versions of
cannam@127 95 GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you
cannam@127 96 can change the set of codelets that are generated or play with the
cannam@127 97 generation options. The set of generated codelets is specified by the
cannam@127 98 <code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add
cannam@127 99 efficient REDFT codelets of small sizes by modifying
cannam@127 100 <code>rdft/codelets/r2r/Makefile.am</code>.
cannam@127 101 <a name="index-REDFT-2"></a>
cannam@127 102 After you modify any <code>Makefile.am</code> files, you can type <code>sh
cannam@127 103 bootstrap.sh</code> in the top-level directory followed by <code>make</code> to
cannam@127 104 re-generate the files.
cannam@127 105 </p>
cannam@127 106 <p>We do not provide more details about the code-generation process, since
cannam@127 107 we do not expect that most users will need to generate their own code.
cannam@127 108 However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if
cannam@127 109 you are interested in the subject.
cannam@127 110 </p>
cannam@127 111 <a name="index-monadic-programming"></a>
cannam@127 112 <p>You might find it interesting to learn Caml and/or some modern
cannam@127 113 programming techniques that we used in the generator (including monadic
cannam@127 114 programming), especially if you heard the rumor that Java and
cannam@127 115 object-oriented programming are the latest advancement in the field.
cannam@127 116 The internal operation of the codelet generator is described in the
cannam@127 117 paper, &ldquo;A Fast Fourier Transform Compiler,&rdquo; by M. Frigo, which is
cannam@127 118 available from the <a href="http://www.fftw.org">FFTW home page</a> and also
cannam@127 119 appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on
cannam@127 120 Programming Language Design and Implementation (PLDI)</cite>.
cannam@127 121 </p>
cannam@127 122 <hr>
cannam@127 123 <div class="header">
cannam@127 124 <p>
cannam@127 125 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> &nbsp; [<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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