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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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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2 <html>
3 <!-- This manual is for FFTW
4 (version 3.3.8, 24 May 2018).
5
6 Copyright (C) 2003 Matteo Frigo.
7
8 Copyright (C) 2003 Massachusetts Institute of Technology.
9
10 Permission is granted to make and distribute verbatim copies of this
11 manual provided the copyright notice and this permission notice are
12 preserved on all copies.
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14 Permission is granted to copy and distribute modified versions of this
15 manual under the conditions for verbatim copying, provided that the
16 entire resulting derived work is distributed under the terms of a
17 permission notice identical to this one.
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19 Permission is granted to copy and distribute translations of this manual
20 into another language, under the above conditions for modified versions,
21 except that this permission notice may be stated in a translation
22 approved by the Free Software Foundation. -->
23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
24 <head>
25 <title>FFTW 3.3.8: Generating your own code</title>
26
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
36 <link href="Installation-and-Customization.html#Installation-and-Customization" rel="up" title="Installation and Customization">
37 <link href="Acknowledgments.html#Acknowledgments" rel="next" title="Acknowledgments">
38 <link href="Cycle-Counters.html#Cycle-Counters" rel="prev" title="Cycle Counters">
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68 </head>
69
70 <body lang="en">
71 <a name="Generating-your-own-code"></a>
72 <div class="header">
73 <p>
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>
75 </div>
76 <hr>
77 <a name="Generating-your-own-code-1"></a>
78 <h3 class="section">10.4 Generating your own code</h3>
79 <a name="index-code-generator-1"></a>
80
81 <p>The directory <code>genfft</code> contains the programs that were used to
82 generate FFTW&rsquo;s &ldquo;codelets,&rdquo; which are hard-coded transforms of small
83 sizes.
84 <a name="index-codelet-2"></a>
85 We do not expect casual users to employ the generator, which is a rather
86 sophisticated program that generates directed acyclic graphs of FFT
87 algorithms and performs algebraic simplifications on them. It was
88 written in Objective Caml, a dialect of ML, which is available at
89 <a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>.
90 <a name="index-Caml"></a>
91 </p>
92
93 <p>If you have Objective Caml installed (along with recent versions of
94 GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you
95 can change the set of codelets that are generated or play with the
96 generation options. The set of generated codelets is specified by the
97 <code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add
98 efficient REDFT codelets of small sizes by modifying
99 <code>rdft/codelets/r2r/Makefile.am</code>.
100 <a name="index-REDFT-2"></a>
101 After you modify any <code>Makefile.am</code> files, you can type <code>sh
102 bootstrap.sh</code> in the top-level directory followed by <code>make</code> to
103 re-generate the files.
104 </p>
105 <p>We do not provide more details about the code-generation process, since
106 we do not expect that most users will need to generate their own code.
107 However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if
108 you are interested in the subject.
109 </p>
110 <a name="index-monadic-programming"></a>
111 <p>You might find it interesting to learn Caml and/or some modern
112 programming techniques that we used in the generator (including monadic
113 programming), especially if you heard the rumor that Java and
114 object-oriented programming are the latest advancement in the field.
115 The internal operation of the codelet generator is described in the
116 paper, &ldquo;A Fast Fourier Transform Compiler,&rdquo; by M. Frigo, which is
117 available from the <a href="http://www.fftw.org">FFTW home page</a> and also
118 appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on
119 Programming Language Design and Implementation (PLDI)</cite>.
120 </p>
121 <hr>
122 <div class="header">
123 <p>
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>
125 </div>
126
127
128
129 </body>
130 </html>