Mercurial > hg > batch-feature-extraction-tool
diff Lib/fftw-3.2.1/doc/html/.svn/text-base/Memory-Allocation.html.svn-base @ 0:25bf17994ef1
First commit. VS2013, Codeblocks and Mac OSX configuration
author | Geogaddi\David <d.m.ronan@qmul.ac.uk> |
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date | Thu, 09 Jul 2015 01:12:16 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Lib/fftw-3.2.1/doc/html/.svn/text-base/Memory-Allocation.html.svn-base Thu Jul 09 01:12:16 2015 +0100 @@ -0,0 +1,82 @@ +<html lang="en"> +<head> +<title>Memory Allocation - 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="Data-Types-and-Files.html#Data-Types-and-Files" title="Data Types and Files"> +<link rel="prev" href="Precision.html#Precision" title="Precision"> +<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="Memory-Allocation"></a> +Previous: <a rel="previous" accesskey="p" href="Precision.html#Precision">Precision</a>, +Up: <a rel="up" accesskey="u" href="Data-Types-and-Files.html#Data-Types-and-Files">Data Types and Files</a> +<hr> +</div> + +<h4 class="subsection">4.1.3 Memory Allocation</h4> + +<pre class="example"> void *fftw_malloc(size_t n); + void fftw_free(void *p); +</pre> + <p><a name="index-fftw_005fmalloc-142"></a><a name="index-fftw_005ffree-143"></a> +These are functions that behave identically to <code>malloc</code> and +<code>free</code>, except that they guarantee that the returned pointer obeys +any special alignment restrictions imposed by any algorithm in FFTW +(e.g. for SIMD acceleration). See <a href="Data-Alignment.html#Data-Alignment">Data Alignment</a>. +<a name="index-alignment-144"></a> +Data allocated by <code>fftw_malloc</code> <em>must</em> be deallocated by +<code>fftw_free</code> and not by the ordinary <code>free</code>. + + <p>These routines simply call through to your operating system's +<code>malloc</code> or, if necessary, its aligned equivalent +(e.g. <code>memalign</code>), so you normally need not worry about any +significant time or space overhead. You are <em>not required</em> to use +them to allocate your data, but we strongly recommend it. + + <p>Note: in C++, just as with ordinary <code>malloc</code>, you must typecast +the output of <code>fftw_malloc</code> to whatever pointer type you are +allocating. +<a name="index-C_002b_002b-145"></a> +<!-- --> + + </body></html> +