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<title>prefetch</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
<meta name="keywords" content="prefetch" />
</head>
<body>
<div class="refentry">
<a id="id-1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="prefetch"></a>
<h1>prefetch</h1>
<p>
Prefetch bytes into the global cache.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
prefetch
</strong>
(</code>
<td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="global.html" target="pagedisplay">__global</a> gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_gentypes</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
<code class="function">prefetch</code> prefetches
<code class="varname">num_gentypes</code> * sizeof(<span class="type">gentype</span>) bytes into
the global cache. The prefetch instruction is applied to a work-item in a work-group
and does not affect the functional behavior of the kernel.
</p>
<p>
The kernel must wait for the completion of all async copies using the
<code class="function">wait_group_events</code> built-in function before
exiting; otherwise the behavior is undefined.
</p>
<p>
General information about async copy functions:
The generic type name <span class="type">gentype</span> indicates the built-in data
types <span class="type">char</span>, <span class="type">char{2|3|4|8|16}</span>, <span class="type">uchar</span>,
<span class="type">uchar{2|3|4|8|16}</span>, <span class="type">short</span>, <span class="type">short{2|3|4|8|16}</span>,
<span class="type">ushort</span>, <span class="type">ushort{2|3|4|8|16}</span>, <span class="type">int</span>,
<span class="type">int{2|3|4|8|16}</span>, <span class="type">uint</span>, <span class="type">uint{2|3|4|8|16}</span>,
<span class="type">long</span>, <span class="type">long{2|3|4|8|16}</span>, <span class="type">ulong</span>,
<span class="type">ulong{2|3|4|8|16}</span>, <span class="type">float</span>, <span class="type">float{2|3|4|8|16}</span>, or
<span class="type">double</span>, <span class="type">double{2|3|4|8|16}</span>
as the type for the arguments unless otherwise stated.
</p>
<p>
When extended by the
<a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> extension,
the generic type <span class="type">gentype<em class="replaceable"><code>n</code></em></span> is extended to
include <span class="type">half</span>, <span class="type">half2</span>, <span class="type">half3</span>, <span class="type">half4</span>,
<span class="type">half8</span>, and <span class="type">half16</span>.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.0-openclc.pdf#namedest=asyncCopyFunctions" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="asyncCopyFunctions.html"><span class="citerefentry"><span class="refentrytitle">Async Copy and Prefetch Functions</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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