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| author | Chris Cannam |
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| date | Wed, 20 Mar 2013 15:35:50 +0000 |
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| 1 <html lang="en"> | |
| 2 <head> | |
| 3 <title>Generating your own code - FFTW 3.3.3</title> | |
| 4 <meta http-equiv="Content-Type" content="text/html"> | |
| 5 <meta name="description" content="FFTW 3.3.3"> | |
| 6 <meta name="generator" content="makeinfo 4.13"> | |
| 7 <link title="Top" rel="start" href="index.html#Top"> | |
| 8 <link rel="up" href="Installation-and-Customization.html#Installation-and-Customization" title="Installation and Customization"> | |
| 9 <link rel="prev" href="Cycle-Counters.html#Cycle-Counters" title="Cycle Counters"> | |
| 10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> | |
| 11 <!-- | |
| 12 This manual is for FFTW | |
| 13 (version 3.3.3, 25 November 2012). | |
| 14 | |
| 15 Copyright (C) 2003 Matteo Frigo. | |
| 16 | |
| 17 Copyright (C) 2003 Massachusetts Institute of Technology. | |
| 18 | |
| 19 Permission is granted to make and distribute verbatim copies of | |
| 20 this manual provided the copyright notice and this permission | |
| 21 notice are preserved on all copies. | |
| 22 | |
| 23 Permission is granted to copy and distribute modified versions of | |
| 24 this manual under the conditions for verbatim copying, provided | |
| 25 that the entire resulting derived work is distributed under the | |
| 26 terms of a permission notice identical to this one. | |
| 27 | |
| 28 Permission is granted to copy and distribute translations of this | |
| 29 manual into another language, under the above conditions for | |
| 30 modified versions, except that this permission notice may be | |
| 31 stated in a translation approved by the Free Software Foundation. | |
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| 45 </head> | |
| 46 <body> | |
| 47 <div class="node"> | |
| 48 <a name="Generating-your-own-code"></a> | |
| 49 <p> | |
| 50 Previous: <a rel="previous" accesskey="p" href="Cycle-Counters.html#Cycle-Counters">Cycle Counters</a>, | |
| 51 Up: <a rel="up" accesskey="u" href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a> | |
| 52 <hr> | |
| 53 </div> | |
| 54 | |
| 55 <h3 class="section">10.4 Generating your own code</h3> | |
| 56 | |
| 57 <p><a name="index-code-generator-622"></a> | |
| 58 The directory <code>genfft</code> contains the programs that were used to | |
| 59 generate FFTW's “codelets,” which are hard-coded transforms of small | |
| 60 sizes. | |
| 61 <a name="index-codelet-623"></a>We do not expect casual users to employ the generator, which is a rather | |
| 62 sophisticated program that generates directed acyclic graphs of FFT | |
| 63 algorithms and performs algebraic simplifications on them. It was | |
| 64 written in Objective Caml, a dialect of ML, which is available at | |
| 65 <a href="http://caml.inria.fr/ocaml/index.en.html">http://caml.inria.fr/ocaml/index.en.html</a>. | |
| 66 <a name="index-Caml-624"></a> | |
| 67 | |
| 68 <p>If you have Objective Caml installed (along with recent versions of | |
| 69 GNU <code>autoconf</code>, <code>automake</code>, and <code>libtool</code>), then you | |
| 70 can change the set of codelets that are generated or play with the | |
| 71 generation options. The set of generated codelets is specified by the | |
| 72 <code>{dft,rdft}/{codelets,simd}/*/Makefile.am</code> files. For example, you can add | |
| 73 efficient REDFT codelets of small sizes by modifying | |
| 74 <code>rdft/codelets/r2r/Makefile.am</code>. | |
| 75 <a name="index-REDFT-625"></a>After you modify any <code>Makefile.am</code> files, you can type <code>sh | |
| 76 bootstrap.sh</code> in the top-level directory followed by <code>make</code> to | |
| 77 re-generate the files. | |
| 78 | |
| 79 <p>We do not provide more details about the code-generation process, since | |
| 80 we do not expect that most users will need to generate their own code. | |
| 81 However, feel free to contact us at <a href="mailto:fftw@fftw.org">fftw@fftw.org</a> if | |
| 82 you are interested in the subject. | |
| 83 | |
| 84 <p><a name="index-monadic-programming-626"></a>You might find it interesting to learn Caml and/or some modern | |
| 85 programming techniques that we used in the generator (including monadic | |
| 86 programming), especially if you heard the rumor that Java and | |
| 87 object-oriented programming are the latest advancement in the field. | |
| 88 The internal operation of the codelet generator is described in the | |
| 89 paper, “A Fast Fourier Transform Compiler,” by M. Frigo, which is | |
| 90 available from the <a href="http://www.fftw.org">FFTW home page</a> and also | |
| 91 appeared in the <cite>Proceedings of the 1999 ACM SIGPLAN Conference on | |
| 92 Programming Language Design and Implementation (PLDI)</cite>. | |
| 93 | |
| 94 </body></html> | |
| 95 |