Mercurial > hg > batch-feature-extraction-tool
diff Lib/fftw-3.2.1/doc/html/.svn/text-base/64_002dbit-Guru-Interface.html.svn-base @ 15:585caf503ef5 tip
Tidy up for ROLI
| author | Geogaddi\David <d.m.ronan@qmul.ac.uk> |
|---|---|
| date | Tue, 17 May 2016 18:50:19 +0100 |
| parents | 636c989477e7 |
| children |
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--- a/Lib/fftw-3.2.1/doc/html/.svn/text-base/64_002dbit-Guru-Interface.html.svn-base Wed May 04 11:02:59 2016 +0100 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,112 +0,0 @@ -<html lang="en"> -<head> -<title>64-bit Guru Interface - FFTW 3.2.1</title> -<meta http-equiv="Content-Type" content="text/html"> -<meta name="description" content="FFTW 3.2.1"> -<meta name="generator" content="makeinfo 4.8"> -<link title="Top" rel="start" href="index.html#Top"> -<link rel="up" href="Guru-Interface.html#Guru-Interface" title="Guru Interface"> -<link rel="prev" href="Guru-Real_002dto_002dreal-Transforms.html#Guru-Real_002dto_002dreal-Transforms" title="Guru Real-to-real Transforms"> -<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> -<!-- -This manual is for FFTW -(version 3.2.1, 5 February 2009). - -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"> -<p> -<a name="64-bit-Guru-Interface"></a> -<a name="g_t64_002dbit-Guru-Interface"></a> -Previous: <a rel="previous" accesskey="p" href="Guru-Real_002dto_002dreal-Transforms.html#Guru-Real_002dto_002dreal-Transforms">Guru Real-to-real Transforms</a>, -Up: <a rel="up" accesskey="u" href="Guru-Interface.html#Guru-Interface">Guru Interface</a> -<hr> -</div> - -<h4 class="subsection">4.5.6 64-bit Guru Interface</h4> - -<p><a name="index-g_t64_002dbit-architecture-252"></a> -When compiled in 64-bit mode on a 64-bit architecture (where addresses -are 64 bits wide), FFTW uses 64-bit quantities internally for all -transform sizes, strides, and so on—you don't have to do anything -special to exploit this. However, in the ordinary FFTW interfaces, -you specify the transform size by an <code>int</code> quantity, which is -normally only 32 bits wide. This means that, even though FFTW is -using 64-bit sizes internally, you cannot specify a single transform -dimension larger than -2<sup><small>31</small></sup>−1numbers. - - <p>We expect that few users will require transforms larger than this, but, -for those who do, we provide a 64-bit version of the guru interface in -which all sizes are specified as integers of type <code>ptrdiff_t</code> -instead of <code>int</code>. (<code>ptrdiff_t</code> is a signed integer type -defined by the C standard to be wide enough to represent address -differences, and thus must be at least 64 bits wide on a 64-bit -machine.) We stress that there is <em>no performance advantage</em> to -using this interface—the same internal FFTW code is employed -regardless—and it is only necessary if you want to specify very -large transform sizes. -<a name="index-ptrdiff_005ft-253"></a> -In particular, the 64-bit guru interface is a set of planner routines -that are exactly the same as the guru planner routines, except that -they are named with `<samp><span class="samp">guru64</span></samp>' instead of `<samp><span class="samp">guru</span></samp>' and they take -arguments of type <code>fftw_iodim64</code> instead of <code>fftw_iodim</code>. -For example, instead of <code>fftw_plan_guru_dft</code>, we have -<code>fftw_plan_guru64_dft</code>. - -<pre class="example"> fftw_plan fftw_plan_guru64_dft( - int rank, const fftw_iodim64 *dims, - int howmany_rank, const fftw_iodim64 *howmany_dims, - fftw_complex *in, fftw_complex *out, - int sign, unsigned flags); -</pre> - <p><a name="index-fftw_005fplan_005fguru64_005fdft-254"></a> -The <code>fftw_iodim64</code> type is similar to <code>fftw_iodim</code>, with the -same interpretation, except that it uses type <code>ptrdiff_t</code> instead -of type <code>int</code>. - -<pre class="example"> typedef struct { - ptrdiff_t n; - ptrdiff_t is; - ptrdiff_t os; - } fftw_iodim64; -</pre> - <p><a name="index-fftw_005fiodim64-255"></a> -Every other `<samp><span class="samp">fftw_plan_guru</span></samp>' function also has a -`<samp><span class="samp">fftw_plan_guru64</span></samp>' equivalent, but we do not repeat their -documentation here since they are identical to the 32-bit versions -except as noted above. - -<!-- --> -</body></html> -