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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam
date Tue, 19 Nov 2019 14:52:55 +0000
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Chris@82 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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Chris@82 3 <!-- This manual is for FFTW
Chris@82 4 (version 3.3.8, 24 May 2018).
Chris@82 5
Chris@82 6 Copyright (C) 2003 Matteo Frigo.
Chris@82 7
Chris@82 8 Copyright (C) 2003 Massachusetts Institute of Technology.
Chris@82 9
Chris@82 10 Permission is granted to make and distribute verbatim copies of this
Chris@82 11 manual provided the copyright notice and this permission notice are
Chris@82 12 preserved on all copies.
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Chris@82 14 Permission is granted to copy and distribute modified versions of this
Chris@82 15 manual under the conditions for verbatim copying, provided that the
Chris@82 16 entire resulting derived work is distributed under the terms of a
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Chris@82 22 approved by the Free Software Foundation. -->
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Chris@82 24 <head>
Chris@82 25 <title>FFTW 3.3.8: Generating your own code</title>
Chris@82 26
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Chris@82 69
Chris@82 70 <body lang="en">
Chris@82 71 <a name="Generating-your-own-code"></a>
Chris@82 72 <div class="header">
Chris@82 73 <p>
Chris@82 74 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>
Chris@82 75 </div>
Chris@82 76 <hr>
Chris@82 77 <a name="Generating-your-own-code-1"></a>
Chris@82 78 <h3 class="section">10.4 Generating your own code</h3>
Chris@82 79 <a name="index-code-generator-1"></a>
Chris@82 80
Chris@82 81 <p>The directory <code>genfft</code> contains the programs that were used to
Chris@82 82 generate FFTW&rsquo;s &ldquo;codelets,&rdquo; which are hard-coded transforms of small
Chris@82 83 sizes.
Chris@82 84 <a name="index-codelet-2"></a>
Chris@82 85 We do not expect casual users to employ the generator, which is a rather
Chris@82 86 sophisticated program that generates directed acyclic graphs of FFT
Chris@82 87 algorithms and performs algebraic simplifications on them. It was
Chris@82 88 written in Objective Caml, a dialect of ML, which is available at
Chris@82 89 <a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>.
Chris@82 90 <a name="index-Caml"></a>
Chris@82 91 </p>
Chris@82 92
Chris@82 93 <p>If you have Objective Caml installed (along with recent versions of
Chris@82 94 GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you
Chris@82 95 can change the set of codelets that are generated or play with the
Chris@82 96 generation options. The set of generated codelets is specified by the
Chris@82 97 <code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add
Chris@82 98 efficient REDFT codelets of small sizes by modifying
Chris@82 99 <code>rdft/codelets/r2r/Makefile.am</code>.
Chris@82 100 <a name="index-REDFT-2"></a>
Chris@82 101 After you modify any <code>Makefile.am</code> files, you can type <code>sh
Chris@82 102 bootstrap.sh</code> in the top-level directory followed by <code>make</code> to
Chris@82 103 re-generate the files.
Chris@82 104 </p>
Chris@82 105 <p>We do not provide more details about the code-generation process, since
Chris@82 106 we do not expect that most users will need to generate their own code.
Chris@82 107 However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if
Chris@82 108 you are interested in the subject.
Chris@82 109 </p>
Chris@82 110 <a name="index-monadic-programming"></a>
Chris@82 111 <p>You might find it interesting to learn Caml and/or some modern
Chris@82 112 programming techniques that we used in the generator (including monadic
Chris@82 113 programming), especially if you heard the rumor that Java and
Chris@82 114 object-oriented programming are the latest advancement in the field.
Chris@82 115 The internal operation of the codelet generator is described in the
Chris@82 116 paper, &ldquo;A Fast Fourier Transform Compiler,&rdquo; by M. Frigo, which is
Chris@82 117 available from the <a href="http://www.fftw.org">FFTW home page</a> and also
Chris@82 118 appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on
Chris@82 119 Programming Language Design and Implementation (PLDI)</cite>.
Chris@82 120 </p>
Chris@82 121 <hr>
Chris@82 122 <div class="header">
Chris@82 123 <p>
Chris@82 124 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>
Chris@82 125 </div>
Chris@82 126
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