Mercurial > hg > sv-dependency-builds
diff src/fftw-3.3.3/doc/html/Generating-your-own-code.html @ 10:37bf6b4a2645
Add FFTW3
| author | Chris Cannam |
|---|---|
| date | Wed, 20 Mar 2013 15:35:50 +0000 |
| parents | |
| children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/fftw-3.3.3/doc/html/Generating-your-own-code.html Wed Mar 20 15:35:50 2013 +0000 @@ -0,0 +1,95 @@ +<html lang="en"> +<head> +<title>Generating your own code - FFTW 3.3.3</title> +<meta http-equiv="Content-Type" content="text/html"> +<meta name="description" content="FFTW 3.3.3"> +<meta name="generator" content="makeinfo 4.13"> +<link title="Top" rel="start" href="index.html#Top"> +<link rel="up" href="Installation-and-Customization.html#Installation-and-Customization" title="Installation and Customization"> +<link rel="prev" href="Cycle-Counters.html#Cycle-Counters" title="Cycle Counters"> +<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> +<!-- +This manual is for FFTW +(version 3.3.3, 25 November 2012). + +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. + --> +<meta http-equiv="Content-Style-Type" content="text/css"> +<style type="text/css"><!-- + pre.display { font-family:inherit } + pre.format { font-family:inherit } + pre.smalldisplay { font-family:inherit; font-size:smaller } + pre.smallformat { font-family:inherit; font-size:smaller } + pre.smallexample { font-size:smaller } + pre.smalllisp { font-size:smaller } + span.sc { font-variant:small-caps } + span.roman { font-family:serif; font-weight:normal; } + span.sansserif { font-family:sans-serif; font-weight:normal; } +--></style> +</head> +<body> +<div class="node"> +<a name="Generating-your-own-code"></a> +<p> +Previous: <a rel="previous" accesskey="p" href="Cycle-Counters.html#Cycle-Counters">Cycle Counters</a>, +Up: <a rel="up" accesskey="u" href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a> +<hr> +</div> + +<h3 class="section">10.4 Generating your own code</h3> + +<p><a name="index-code-generator-622"></a> +The directory <code>genfft</code> contains the programs that were used to +generate FFTW's “codelets,” which are hard-coded transforms of small +sizes. +<a name="index-codelet-623"></a>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>. +<a name="index-Caml-624"></a> + + <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>. +<a name="index-REDFT-625"></a>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>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><a name="index-monadic-programming-626"></a>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>. + + </body></html> +