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| <title>cl_khr_fp16</title> |
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| <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="cl_khr_fp16"></a> |
| <h1>cl_khr_fp16</h1> |
| <p> |
| Optional half floating-point support. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| #pragma OPENCL EXTENSION cl_khr_fp16 : enable |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| This extension adds support for half scalar and vector types as built-in types that |
| can be used for arithmetic operations, conversions, etc. An application that wants |
| to use <span class="type">half</span> and <span class="type">half<em class="replaceable"><code>n</code></em></span> types will |
| need to include the directive shown above. |
| </p> |
| <p> |
| The list of built-in scalar and vector data types are extended to include the types |
| in the table below. |
| </p> |
| <p> |
| The built-in vector data types for |
| <span class="type">half<em class="replaceable"><code>n</code></em></span> are also declared as |
| appropriate types in the OpenCL API (and header files) that can be used by an |
| application. The following table describes the built-in vector data types for |
| <span class="type">half<em class="replaceable"><code>n</code></em></span> as defined in the OpenCL C programming |
| language and the corresponding data type available to the application: |
| </p> |
| <p> |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| <col align="left" class="col3" /> |
| </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">half2</td> |
| <td align="left">2-component half-precision floating-point |
| vector</td> |
| <td align="left">cl_half2</td> |
| </tr> |
| <tr> |
| <td align="left">half3</td> |
| <td align="left">3-component half-precision floating-point vector</td> |
| <td align="left">cl_half3</td> |
| </tr> |
| <tr> |
| <td align="left">half4</td> |
| <td align="left">4-component half-precision floating-point |
| vector</td> |
| <td align="left">cl_half4</td> |
| </tr> |
| <tr> |
| <td align="left">half8</td> |
| <td align="left">8-component half-precision floating-point |
| vector</td> |
| <td align="left">cl_half8</td> |
| </tr> |
| <tr> |
| <td align="left">half16</td> |
| <td align="left">16-component half-precision floating-point |
| vector</td> |
| <td align="left">cl_half16</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| </p> |
| <p> |
| The relational, equality, logical and logical unary |
| <a class="citerefentry" href="operators.html"><span class="citerefentry"><span class="refentrytitle">operators</span></span></a> can be used |
| with <span class="type">half</span> scalar and <span class="type">half<em class="replaceable"><code>n</code></em></span> |
| vector types and shall produce a scalar <span class="type">int</span> and vector |
| <span class="type">short<em class="replaceable"><code>n</code></em></span> result respectively. |
| </p> |
| <p> |
| The OpenCL compiler accepts an <code class="constant">h</code> and <code class="constant">H</code> suffix |
| on floating point literals, indicating the literal is typed as a <span class="type">half</span>. |
| </p> |
| <p> |
| The macro names given in the following list must use the values specified. These constant |
| expressions are suitable for use in <code class="constant">#if</code> preprocessing directives. |
| </p> |
| <p> |
| The following table also describes the corresponding macro names available to the |
| application. |
| </p> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| <col align="left" class="col3" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">Macro in OpenCL Language</th> |
| <th align="left">value</th> |
| <th align="left">Macro for application</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_DIG</code> |
| </td> |
| <td align="left"> |
| <code class="code">3</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_DIG</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_MANT_DIG</code> |
| </td> |
| <td align="left"> |
| <code class="code">11</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_MANT_DIG</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_MAX_10_EXP</code> |
| </td> |
| <td align="left"> |
| <code class="code">+4</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_MAX_10_EXP</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_MAX_EXP</code> |
| </td> |
| <td align="left"> |
| <code class="code">+16</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_MAX_EXP</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_MIN_10_EXP</code> |
| </td> |
| <td align="left"> |
| <code class="code">-4</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_MIN_10_EXP</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_MIN_EXP</code> |
| </td> |
| <td align="left"> |
| <code class="code">-13</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_MIN_EXP</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_RADIX</code> |
| </td> |
| <td align="left"> |
| <code class="code">2</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_RADIX</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_MAX</code> |
| </td> |
| <td align="left"> |
| <code class="code">0x1.ffcp15h</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_MAX</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_MIN</code> |
| </td> |
| <td align="left"> |
| <code class="code">0x1.0p-14h</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_MIN</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">#define HALF_EPSILON</code> |
| </td> |
| <td align="left"> |
| <code class="code">0x1.0p-10h</code> |
| </td> |
| <td align="left"> |
| <code class="constant">HALF_EPSILON</code> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| The following constants are also available. They are of type <span class="type">half</span> and |
| are accurate within the precision of the <span class="type">half</span> type. |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">Constant</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="code">M_E_H</code> |
| </td> |
| <td align="left">Value of e</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_LOG2E_H</code> |
| </td> |
| <td align="left"> Value of log2 e</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_LOG10E_H</code> |
| </td> |
| <td align="left">Value of log10 e</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_LN2_H</code> |
| </td> |
| <td align="left">Value of ln 2</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_LN10_H</code> |
| </td> |
| <td align="left"> Value of ln 10</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_PI_H</code> |
| </td> |
| <td align="left"> Value of π</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_PI_2_H</code> |
| </td> |
| <td align="left">Value of π / 2</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_PI_4_H</code> |
| </td> |
| <td align="left">Value of π / 4</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_1_PI_H</code> |
| </td> |
| <td align="left">Value of 1 / π</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_2_PI_H</code> |
| </td> |
| <td align="left">Value of 2 / π</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_2_SQRTPI_H</code> |
| </td> |
| <td align="left">Value of 2 / √π</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_SQRT2_H</code> |
| </td> |
| <td align="left">Value of √2</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="code">M_SQRT1_2_H</code> |
| </td> |
| <td align="left">Value of 1 / √2</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| Ann application may query the configuration information using |
| the op-code <code class="constant">CL_DEVICE_HALF_FP_CONFIG</code> with |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> for an |
| OpenCL device that supports half precision floating-point. |
| </p> |
| <h4><a id="id-1.5.14"></a>Conversions</h4> |
| <p> |
| The implicit conversion rules specified in section 6.2.1 |
| now include the <span class="type">half</span> scalar and |
| <span class="type">half<em class="replaceable"><code>n</code></em></span> |
| vector data types. |
| </p> |
| <p> |
| The explicit casts described in section 6.2.2 are |
| extended to take a <span class="type">half</span> scalar data type and a |
| <span class="type">half<em class="replaceable"><code>n</code></em></span> vector data type. |
| </p> |
| <p> |
| The explicit conversion functions described in section |
| 6.2.3 are extended to take a <span class="type">half</span> scalar |
| data type and a <span class="type">half<em class="replaceable"><code>n</code></em></span> |
| vector data type. |
| </p> |
| <p> |
| The as_typen() |
| function for re-interpreting types as described in section |
| 6.2.4.2 is extended to allow conversion-free casts between |
| <span class="type">short<em class="replaceable"><code>n</code></em></span>, |
| <span class="type">ushort<em class="replaceable"><code>n</code></em></span> and |
| <span class="type">half<em class="replaceable"><code>n</code></em></span> |
| scalar and vector data types. |
| </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-2.1-extensions.pdf#page=12" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</span></span></a>, |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>, |
| <a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">mathFunctions</span></span></a>, |
| <a class="citerefentry" href="commonFunctions.html"><span class="citerefentry"><span class="refentrytitle">commonFunctions</span></span></a>, |
| <a class="citerefentry" href="geometricFunctions.html"><span class="citerefentry"><span class="refentrytitle">geometricFunctions</span></span></a>, |
| <a class="citerefentry" href="relationalFunctions.html"><span class="citerefentry"><span class="refentrytitle">relationalFunctions</span></span></a>, |
| <a class="citerefentry" href="vectorDataLoadandStoreFunctions.html"><span class="citerefentry"><span class="refentrytitle">vectorDataLoadandStoreFunctions</span></span></a>, |
| <a class="citerefentry" href="asyncCopyFunctions.html"><span class="citerefentry"><span class="refentrytitle">asyncCopyFunctions</span></span></a>, |
| <a class="citerefentry" href="imageFunctions.html"><span class="citerefentry"><span class="refentrytitle">imageFunctions</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. |
| </div> |
| </div> |
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| </html> |
