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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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| 14:636c989477e7 | 15:585caf503ef5 |
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| 1 <html lang="en"> | |
| 2 <head> | |
| 3 <title>Memory Allocation - FFTW 3.2.1</title> | |
| 4 <meta http-equiv="Content-Type" content="text/html"> | |
| 5 <meta name="description" content="FFTW 3.2.1"> | |
| 6 <meta name="generator" content="makeinfo 4.8"> | |
| 7 <link title="Top" rel="start" href="index.html#Top"> | |
| 8 <link rel="up" href="Data-Types-and-Files.html#Data-Types-and-Files" title="Data Types and Files"> | |
| 9 <link rel="prev" href="Precision.html#Precision" title="Precision"> | |
| 10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> | |
| 11 <!-- | |
| 12 This manual is for FFTW | |
| 13 (version 3.2.1, 5 February 2009). | |
| 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. | |
| 32 --> | |
| 33 <meta http-equiv="Content-Style-Type" content="text/css"> | |
| 34 <style type="text/css"><!-- | |
| 35 pre.display { font-family:inherit } | |
| 36 pre.format { font-family:inherit } | |
| 37 pre.smalldisplay { font-family:inherit; font-size:smaller } | |
| 38 pre.smallformat { font-family:inherit; font-size:smaller } | |
| 39 pre.smallexample { font-size:smaller } | |
| 40 pre.smalllisp { font-size:smaller } | |
| 41 span.sc { font-variant:small-caps } | |
| 42 span.roman { font-family:serif; font-weight:normal; } | |
| 43 span.sansserif { font-family:sans-serif; font-weight:normal; } | |
| 44 --></style> | |
| 45 </head> | |
| 46 <body> | |
| 47 <div class="node"> | |
| 48 <p> | |
| 49 <a name="Memory-Allocation"></a> | |
| 50 Previous: <a rel="previous" accesskey="p" href="Precision.html#Precision">Precision</a>, | |
| 51 Up: <a rel="up" accesskey="u" href="Data-Types-and-Files.html#Data-Types-and-Files">Data Types and Files</a> | |
| 52 <hr> | |
| 53 </div> | |
| 54 | |
| 55 <h4 class="subsection">4.1.3 Memory Allocation</h4> | |
| 56 | |
| 57 <pre class="example"> void *fftw_malloc(size_t n); | |
| 58 void fftw_free(void *p); | |
| 59 </pre> | |
| 60 <p><a name="index-fftw_005fmalloc-142"></a><a name="index-fftw_005ffree-143"></a> | |
| 61 These are functions that behave identically to <code>malloc</code> and | |
| 62 <code>free</code>, except that they guarantee that the returned pointer obeys | |
| 63 any special alignment restrictions imposed by any algorithm in FFTW | |
| 64 (e.g. for SIMD acceleration). See <a href="Data-Alignment.html#Data-Alignment">Data Alignment</a>. | |
| 65 <a name="index-alignment-144"></a> | |
| 66 Data allocated by <code>fftw_malloc</code> <em>must</em> be deallocated by | |
| 67 <code>fftw_free</code> and not by the ordinary <code>free</code>. | |
| 68 | |
| 69 <p>These routines simply call through to your operating system's | |
| 70 <code>malloc</code> or, if necessary, its aligned equivalent | |
| 71 (e.g. <code>memalign</code>), so you normally need not worry about any | |
| 72 significant time or space overhead. You are <em>not required</em> to use | |
| 73 them to allocate your data, but we strongly recommend it. | |
| 74 | |
| 75 <p>Note: in C++, just as with ordinary <code>malloc</code>, you must typecast | |
| 76 the output of <code>fftw_malloc</code> to whatever pointer type you are | |
| 77 allocating. | |
| 78 <a name="index-C_002b_002b-145"></a> | |
| 79 <!-- --> | |
| 80 | |
| 81 </body></html> | |
| 82 |