|
Chris@82
|
1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
Chris@82
|
2 <html>
|
|
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.
|
|
Chris@82
|
13
|
|
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
|
|
Chris@82
|
17 permission notice identical to this one.
|
|
Chris@82
|
18
|
|
Chris@82
|
19 Permission is granted to copy and distribute translations of this manual
|
|
Chris@82
|
20 into another language, under the above conditions for modified versions,
|
|
Chris@82
|
21 except that this permission notice may be stated in a translation
|
|
Chris@82
|
22 approved by the Free Software Foundation. -->
|
|
Chris@82
|
23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
|
|
Chris@82
|
24 <head>
|
|
Chris@82
|
25 <title>FFTW 3.3.8: Generating your own code</title>
|
|
Chris@82
|
26
|
|
Chris@82
|
27 <meta name="description" content="FFTW 3.3.8: Generating your own code">
|
|
Chris@82
|
28 <meta name="keywords" content="FFTW 3.3.8: Generating your own code">
|
|
Chris@82
|
29 <meta name="resource-type" content="document">
|
|
Chris@82
|
30 <meta name="distribution" content="global">
|
|
Chris@82
|
31 <meta name="Generator" content="makeinfo">
|
|
Chris@82
|
32 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
Chris@82
|
33 <link href="index.html#Top" rel="start" title="Top">
|
|
Chris@82
|
34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
|
|
Chris@82
|
35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
Chris@82
|
36 <link href="Installation-and-Customization.html#Installation-and-Customization" rel="up" title="Installation and Customization">
|
|
Chris@82
|
37 <link href="Acknowledgments.html#Acknowledgments" rel="next" title="Acknowledgments">
|
|
Chris@82
|
38 <link href="Cycle-Counters.html#Cycle-Counters" rel="prev" title="Cycle Counters">
|
|
Chris@82
|
39 <style type="text/css">
|
|
Chris@82
|
40 <!--
|
|
Chris@82
|
41 a.summary-letter {text-decoration: none}
|
|
Chris@82
|
42 blockquote.indentedblock {margin-right: 0em}
|
|
Chris@82
|
43 blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
Chris@82
|
44 blockquote.smallquotation {font-size: smaller}
|
|
Chris@82
|
45 div.display {margin-left: 3.2em}
|
|
Chris@82
|
46 div.example {margin-left: 3.2em}
|
|
Chris@82
|
47 div.lisp {margin-left: 3.2em}
|
|
Chris@82
|
48 div.smalldisplay {margin-left: 3.2em}
|
|
Chris@82
|
49 div.smallexample {margin-left: 3.2em}
|
|
Chris@82
|
50 div.smalllisp {margin-left: 3.2em}
|
|
Chris@82
|
51 kbd {font-style: oblique}
|
|
Chris@82
|
52 pre.display {font-family: inherit}
|
|
Chris@82
|
53 pre.format {font-family: inherit}
|
|
Chris@82
|
54 pre.menu-comment {font-family: serif}
|
|
Chris@82
|
55 pre.menu-preformatted {font-family: serif}
|
|
Chris@82
|
56 pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
Chris@82
|
57 pre.smallexample {font-size: smaller}
|
|
Chris@82
|
58 pre.smallformat {font-family: inherit; font-size: smaller}
|
|
Chris@82
|
59 pre.smalllisp {font-size: smaller}
|
|
Chris@82
|
60 span.nolinebreak {white-space: nowrap}
|
|
Chris@82
|
61 span.roman {font-family: initial; font-weight: normal}
|
|
Chris@82
|
62 span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
Chris@82
|
63 ul.no-bullet {list-style: none}
|
|
Chris@82
|
64 -->
|
|
Chris@82
|
65 </style>
|
|
Chris@82
|
66
|
|
Chris@82
|
67
|
|
Chris@82
|
68 </head>
|
|
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> [<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’s “codelets,” 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, “A Fast Fourier Transform Compiler,” 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> [<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
|
|
Chris@82
|
127
|
|
Chris@82
|
128
|
|
Chris@82
|
129 </body>
|
|
Chris@82
|
130 </html>
|
