120 lines
5.6 KiB
HTML
120 lines
5.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This manual is for FFTW
|
|
(version 3.3.10, 10 December 2020).
|
|
|
|
Copyright (C) 2003 Matteo Frigo.
|
|
|
|
Copyright (C) 2003 Massachusetts Institute of Technology.
|
|
|
|
Permission is granted to make and distribute verbatim copies of this
|
|
manual provided the copyright notice and this permission notice are
|
|
preserved on all copies.
|
|
|
|
Permission is granted to copy and distribute modified versions of this
|
|
manual under the conditions for verbatim copying, provided that the
|
|
entire resulting derived work is distributed under the terms of a
|
|
permission notice identical to this one.
|
|
|
|
Permission is granted to copy and distribute translations of this manual
|
|
into another language, under the above conditions for modified versions,
|
|
except that this permission notice may be stated in a translation
|
|
approved by the Free Software Foundation. -->
|
|
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<title>Generating your own code (FFTW 3.3.10)</title>
|
|
|
|
<meta name="description" content="Generating your own code (FFTW 3.3.10)">
|
|
<meta name="keywords" content="Generating your own code (FFTW 3.3.10)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<link href="index.html" rel="start" title="Top">
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Installation-and-Customization.html" rel="up" title="Installation and Customization">
|
|
<link href="Acknowledgments.html" rel="next" title="Acknowledgments">
|
|
<link href="Cycle-Counters.html" rel="prev" title="Cycle Counters">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<span id="Generating-your-own-code"></span><div class="header">
|
|
<p>
|
|
Previous: <a href="Cycle-Counters.html" accesskey="p" rel="prev">Cycle Counters</a>, Up: <a href="Installation-and-Customization.html" 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" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<span id="Generating-your-own-code-1"></span><h3 class="section">10.4 Generating your own code</h3>
|
|
<span id="index-code-generator-1"></span>
|
|
|
|
<p>The directory <code>genfft</code> contains the programs that were used to
|
|
generate FFTW’s “codelets,” which are hard-coded transforms of small
|
|
sizes.
|
|
<span id="index-codelet-2"></span>
|
|
We do not expect casual users to employ the generator, which is a rather
|
|
sophisticated program that generates directed acyclic graphs of FFT
|
|
algorithms and performs algebraic simplifications on them. It was
|
|
written in Objective Caml, a dialect of ML, which is available at
|
|
<a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>.
|
|
<span id="index-Caml"></span>
|
|
</p>
|
|
|
|
<p>If you have Objective Caml installed (along with recent versions of
|
|
GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you
|
|
can change the set of codelets that are generated or play with the
|
|
generation options. The set of generated codelets is specified by the
|
|
<code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add
|
|
efficient REDFT codelets of small sizes by modifying
|
|
<code>rdft/codelets/r2r/Makefile.am</code>.
|
|
<span id="index-REDFT-2"></span>
|
|
After you modify any <code>Makefile.am</code> files, you can type <code>sh
|
|
bootstrap.sh</code> in the top-level directory followed by <code>make</code> to
|
|
re-generate the files.
|
|
</p>
|
|
<p>We do not provide more details about the code-generation process, since
|
|
we do not expect that most users will need to generate their own code.
|
|
However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if
|
|
you are interested in the subject.
|
|
</p>
|
|
<span id="index-monadic-programming"></span>
|
|
<p>You might find it interesting to learn Caml and/or some modern
|
|
programming techniques that we used in the generator (including monadic
|
|
programming), especially if you heard the rumor that Java and
|
|
object-oriented programming are the latest advancement in the field.
|
|
The internal operation of the codelet generator is described in the
|
|
paper, “A Fast Fourier Transform Compiler,” by M. Frigo, which is
|
|
available from the <a href="http://www.fftw.org">FFTW home page</a> and also
|
|
appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on
|
|
Programming Language Design and Implementation (PLDI)</cite>.
|
|
</p>
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Previous: <a href="Cycle-Counters.html" accesskey="p" rel="prev">Cycle Counters</a>, Up: <a href="Installation-and-Customization.html" 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" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|