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| <title>cl_khr_fp64</title> |
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| <a xmlns="http://www.w3.org/1999/xhtml" id="cl_khr_fp64"></a> |
| <h1>cl_khr_fp64</h1> |
| <p> |
| Support for <span xmlns="http://www.w3.org/1999/xhtml" class="type">double</span> floating-point precision. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
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| <tr> |
| <td align="left"> |
| #pragma OPENCL EXTENSION cl_khr_fp64 : enable |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <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. |
| </p> |
| <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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| <div class="informaltable"> |
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| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">Type in OpenCL Language</th> |
| <th align="left">Description</th> |
| <th align="left">API type for application</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left">double</td> |
| <td align="left">A double precision vector</td> |
| <td align="left">cl_double</td> |
| </tr> |
| <tr> |
| <td align="left">double2</td> |
| <td align="left">2-component double vector</td> |
| <td align="left">cl_double2</td> |
| </tr> |
| <tr> |
| <td align="left">double4</td> |
| <td align="left">4-component double vector</td> |
| <td align="left">cl_double4</td> |
| </tr> |
| <tr> |
| <td align="left">double8</td> |
| <td align="left">8-component double vector</td> |
| <td align="left">cl_double8</td> |
| </tr> |
| <tr> |
| <td align="left">double16</td> |
| <td align="left">16-component double vector</td> |
| <td align="left">cl_double16</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| </p> |
| <p> |
| The double data type must confirm to the IEEE-754 double precision storage format. |
| </p> |
| <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. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="specification"></a> |
| <h2>Specification</h2> |
| <p> |
| <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> |
| </p> |
| </div> |
| <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> |
| </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 © 2007-2009 The Khronos Group Inc. |
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| in all copies or substantial portions of the Materials. |
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