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1 <html lang="en">
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2 <head>
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3 <title>Generating your own code - FFTW 3.3.3</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.3">
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6 <meta name="generator" content="makeinfo 4.13">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="up" href="Installation-and-Customization.html#Installation-and-Customization" title="Installation and Customization">
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9 <link rel="prev" href="Cycle-Counters.html#Cycle-Counters" title="Cycle Counters">
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10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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11 <!--
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12 This manual is for FFTW
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13 (version 3.3.3, 25 November 2012).
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14
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15 Copyright (C) 2003 Matteo Frigo.
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16
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17 Copyright (C) 2003 Massachusetts Institute of Technology.
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18
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19 Permission is granted to make and distribute verbatim copies of
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20 this manual provided the copyright notice and this permission
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21 notice are preserved on all copies.
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22
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23 Permission is granted to copy and distribute modified versions of
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24 this manual under the conditions for verbatim copying, provided
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25 that the entire resulting derived work is distributed under the
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26 terms of a permission notice identical to this one.
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27
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28 Permission is granted to copy and distribute translations of this
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29 manual into another language, under the above conditions for
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30 modified versions, except that this permission notice may be
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31 stated in a translation approved by the Free Software Foundation.
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32 -->
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34 <style type="text/css"><!--
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44 --></style>
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45 </head>
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46 <body>
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47 <div class="node">
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48 <a name="Generating-your-own-code"></a>
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49 <p>
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50 Previous: <a rel="previous" accesskey="p" href="Cycle-Counters.html#Cycle-Counters">Cycle Counters</a>,
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51 Up: <a rel="up" accesskey="u" href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>
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52 <hr>
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53 </div>
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54
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55 <h3 class="section">10.4 Generating your own code</h3>
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56
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57 <p><a name="index-code-generator-622"></a>
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58 The directory <code>genfft</code> contains the programs that were used to
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59 generate FFTW's “codelets,” which are hard-coded transforms of small
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60 sizes.
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61 <a name="index-codelet-623"></a>We do not expect casual users to employ the generator, which is a rather
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62 sophisticated program that generates directed acyclic graphs of FFT
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63 algorithms and performs algebraic simplifications on them. It was
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64 written in Objective Caml, a dialect of ML, which is available at
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65 <a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>.
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66 <a name="index-Caml-624"></a>
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67
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68 <p>If you have Objective Caml installed (along with recent versions of
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69 GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you
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70 can change the set of codelets that are generated or play with the
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71 generation options. The set of generated codelets is specified by the
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72 <code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add
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73 efficient REDFT codelets of small sizes by modifying
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74 <code>rdft/codelets/r2r/Makefile.am</code>.
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75 <a name="index-REDFT-625"></a>After you modify any <code>Makefile.am</code> files, you can type <code>sh
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76 bootstrap.sh</code> in the top-level directory followed by <code>make</code> to
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77 re-generate the files.
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78
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79 <p>We do not provide more details about the code-generation process, since
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80 we do not expect that most users will need to generate their own code.
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81 However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if
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82 you are interested in the subject.
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83
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84 <p><a name="index-monadic-programming-626"></a>You might find it interesting to learn Caml and/or some modern
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85 programming techniques that we used in the generator (including monadic
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86 programming), especially if you heard the rumor that Java and
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87 object-oriented programming are the latest advancement in the field.
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88 The internal operation of the codelet generator is described in the
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89 paper, “A Fast Fourier Transform Compiler,” by M. Frigo, which is
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90 available from the <a href="http://www.fftw.org">FFTW home page</a> and also
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91 appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on
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92 Programming Language Design and Implementation (PLDI)</cite>.
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93
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94 </body></html>
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