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<title>cl_khr_fp64</title>
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<h1>cl_khr_fp64</h1>
<p>
Support for <span xmlns="http://www.w3.org/1999/xhtml" class="type">double</span> floating-point precision.
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<div class="refsect2">
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#pragma OPENCL EXTENSION cl_khr_fp64 : enable
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<h2>Description</h2>
<p>
Support for double floating-point precision is a requirement for a class of scientific computing algorithms/applications. This class of applications can be enabled by adding support for double precision floating-point as an optional extension.
</p>
<p>
OpenCL 1.0 adds support for double precision floating-point as an optional extension. An application that wants to use <span class="type">double</span> will need to include the <code class="function">#pragma OPENCL EXTENSION cl_khr_fp64 : enable</code> directive before any double precision data type is declared in the kernel code.
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<p>
The lists of built-in <a class="citerefentry" href="scalarDataTypes.html"><span class="citerefentry"><span class="refentrytitle">scalar data types</span></span></a> and <a class="citerefentry" href="vectorDataTypes.html"><span class="citerefentry"><span class="refentrytitle">vector data types</span></span></a> are extended to include the following:
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<th align="left">Type in OpenCL Language</th>
<th align="left">Description</th>
<th align="left">API type for application</th>
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<td align="left">double</td>
<td align="left">A double precision vector</td>
<td align="left">cl_double</td>
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<td align="left">double2</td>
<td align="left">2-component double vector</td>
<td align="left">cl_double2</td>
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<td align="left">double4</td>
<td align="left">4-component double vector</td>
<td align="left">cl_double4</td>
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<td align="left">double8</td>
<td align="left">8-component double vector</td>
<td align="left">cl_double8</td>
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<td align="left">double16</td>
<td align="left">16-component double vector</td>
<td align="left">cl_double16</td>
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<p>
The double data type must confirm to the IEEE-754 double precision storage format.
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<p>
Conversions from <span class="type">double</span> to <span class="type">half</span> are correctly rounded. Conversions from <span class="type">half</span> to <span class="type">double</span> are lossless.
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<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
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<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=225" target="OpenCL Spec">OpenCL Specification</a>
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<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span>, <a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</span></span></a></span></a>
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<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 © 2007-2009 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,
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