Mercurial > hg > js-dsp-test

annotate fft/fftw/fftw-3.3.4/doc/html/Generating-your-own-code.html @ 40:223f770b5341 kissfft-double tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Try a double-precision kissfft
author Chris Cannam
date Wed, 07 Sep 2016 10:40:32 +0100
parents 26056e866c29
children
rev   line source
Chris@19 1 <html lang="en">
Chris@19 2 <head>
Chris@19 3 <title>Generating your own code - FFTW 3.3.4</title>
Chris@19 4 <meta http-equiv="Content-Type" content="text/html">
Chris@19 5 <meta name="description" content="FFTW 3.3.4">
Chris@19 6 <meta name="generator" content="makeinfo 4.13">
Chris@19 7 <link title="Top" rel="start" href="index.html#Top">
Chris@19 8 <link rel="up" href="Installation-and-Customization.html#Installation-and-Customization" title="Installation and Customization">
Chris@19 9 <link rel="prev" href="Cycle-Counters.html#Cycle-Counters" title="Cycle Counters">
Chris@19 10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
Chris@19 11 <!--
Chris@19 12 This manual is for FFTW
Chris@19 13 (version 3.3.4, 20 September 2013).
Chris@19 14
Chris@19 15 Copyright (C) 2003 Matteo Frigo.
Chris@19 16
Chris@19 17 Copyright (C) 2003 Massachusetts Institute of Technology.
Chris@19 18
Chris@19 19 Permission is granted to make and distribute verbatim copies of
Chris@19 20 this manual provided the copyright notice and this permission
Chris@19 21 notice are preserved on all copies.
Chris@19 22
Chris@19 23 Permission is granted to copy and distribute modified versions of
Chris@19 24 this manual under the conditions for verbatim copying, provided
Chris@19 25 that the entire resulting derived work is distributed under the
Chris@19 26 terms of a permission notice identical to this one.
Chris@19 27
Chris@19 28 Permission is granted to copy and distribute translations of this
Chris@19 29 manual into another language, under the above conditions for
Chris@19 30 modified versions, except that this permission notice may be
Chris@19 31 stated in a translation approved by the Free Software Foundation.
Chris@19 32 -->
Chris@19 33 <meta http-equiv="Content-Style-Type" content="text/css">
Chris@19 34 <style type="text/css"><!--
Chris@19 35 pre.display { font-family:inherit }
Chris@19 36 pre.format { font-family:inherit }
Chris@19 37 pre.smalldisplay { font-family:inherit; font-size:smaller }
Chris@19 38 pre.smallformat { font-family:inherit; font-size:smaller }
Chris@19 39 pre.smallexample { font-size:smaller }
Chris@19 40 pre.smalllisp { font-size:smaller }
Chris@19 41 span.sc { font-variant:small-caps }
Chris@19 42 span.roman { font-family:serif; font-weight:normal; }
Chris@19 43 span.sansserif { font-family:sans-serif; font-weight:normal; }
Chris@19 44 --></style>
Chris@19 45 </head>
Chris@19 46 <body>
Chris@19 47 <div class="node">
Chris@19 48 <a name="Generating-your-own-code"></a>
Chris@19 49 <p>
Chris@19 50 Previous:&nbsp;<a rel="previous" accesskey="p" href="Cycle-Counters.html#Cycle-Counters">Cycle Counters</a>,
Chris@19 51 Up:&nbsp;<a rel="up" accesskey="u" href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>
Chris@19 52 <hr>
Chris@19 53 </div>
Chris@19 54
Chris@19 55 <h3 class="section">10.4 Generating your own code</h3>
Chris@19 56
Chris@19 57 <p><a name="index-code-generator-625"></a>
Chris@19 58 The directory <code>genfft</code> contains the programs that were used to
Chris@19 59 generate FFTW's &ldquo;codelets,&rdquo; which are hard-coded transforms of small
Chris@19 60 sizes.
Chris@19 61 <a name="index-codelet-626"></a>We do not expect casual users to employ the generator, which is a rather
Chris@19 62 sophisticated program that generates directed acyclic graphs of FFT
Chris@19 63 algorithms and performs algebraic simplifications on them. It was
Chris@19 64 written in Objective Caml, a dialect of ML, which is available at
Chris@19 65 <a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>.
Chris@19 66 <a name="index-Caml-627"></a>
Chris@19 67
Chris@19 68 <p>If you have Objective Caml installed (along with recent versions of
Chris@19 69 GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you
Chris@19 70 can change the set of codelets that are generated or play with the
Chris@19 71 generation options. The set of generated codelets is specified by the
Chris@19 72 <code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add
Chris@19 73 efficient REDFT codelets of small sizes by modifying
Chris@19 74 <code>rdft/codelets/r2r/Makefile.am</code>.
Chris@19 75 <a name="index-REDFT-628"></a>After you modify any <code>Makefile.am</code> files, you can type <code>sh
Chris@19 76 bootstrap.sh</code> in the top-level directory followed by <code>make</code> to
Chris@19 77 re-generate the files.
Chris@19 78
Chris@19 79 <p>We do not provide more details about the code-generation process, since
Chris@19 80 we do not expect that most users will need to generate their own code.
Chris@19 81 However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if
Chris@19 82 you are interested in the subject.
Chris@19 83
Chris@19 84 <p><a name="index-monadic-programming-629"></a>You might find it interesting to learn Caml and/or some modern
Chris@19 85 programming techniques that we used in the generator (including monadic
Chris@19 86 programming), especially if you heard the rumor that Java and
Chris@19 87 object-oriented programming are the latest advancement in the field.
Chris@19 88 The internal operation of the codelet generator is described in the
Chris@19 89 paper, &ldquo;A Fast Fourier Transform Compiler,&rdquo; by M. Frigo, which is
Chris@19 90 available from the <a href="http://www.fftw.org">FFTW home page</a> and also
Chris@19 91 appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on
Chris@19 92 Programming Language Design and Implementation (PLDI)</cite>.
Chris@19 93
Chris@19 94 </body></html>
Chris@19 95