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| <title>Scalar Data Types</title> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /> |
| <meta name="keywords" content="Scalar Data Types" /> |
| </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="Built-inScalarDataTypes"></a> |
| <h1>Scalar Data Types</h1> |
| <p> |
| Built-in scalar data types. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| These are the data types available in the OpenCL C programming language used to create |
| kernels that are executed on OpenCL device(s). The OpenCL C programming language (also |
| referred to as OpenCL C) is based on the ISO/IEC 9899:1999 C language specification |
| (a.k.a. C99 specification) with specific extensions and restrictions. Please refer |
| to the ISO/IEC 9899:1999 specification for a detailed description of the language |
| grammar. This section describes modifications and restrictions to ISO/IEC 9899:1999 |
| supported in OpenCL C. |
| </p> |
| <p> |
| Most built-in scalar data types 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 scalar data type in the OpenCL C programming language and the corresponding |
| data type available to the application: |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" 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 C Language</th> |
| <th align="left">Description</th> |
| <th align="left">API type for application</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> <span class="type">bool</span> </td> |
| <td align="left"> |
| A conditional data type which is either <code class="varname">true</code> or |
| <code class="varname">false</code>. The value <code class="varname">true</code> expands |
| to the integer constant 1 and the value <code class="varname">false</code> |
| expands to the integer constant 0. When any scalar value is converted |
| to bool, the result is 0 if the value compares equal to 0; otherwise, |
| the result is 1. |
| </td> |
| <td align="left"> n/a </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">char</span> </td> |
| <td align="left"> A signed two's complement 8-bit integer. </td> |
| <td align="left"> <span class="type">cl_char</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <div class="literallayout"><p><span class="type">unsigned char</span>,<br /> |
| <span class="type">uchar</span></p></div> |
| </td> |
| <td align="left"> An unsigned 8-bit integer. </td> |
| <td align="left"> <span class="type">cl_uchar</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">short</span> </td> |
| <td align="left"> A signed two's complement 16-bit integer. </td> |
| <td align="left"> <span class="type">cl_short</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <div class="literallayout"><p><span class="type">unsigned short</span>,<br /> |
| <span class="type">ushort</span></p></div> |
| </td> |
| <td align="left"> An unsigned 16-bit integer. </td> |
| <td align="left"> <span class="type">cl_ushort</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">int</span> </td> |
| <td align="left"> A signed two's complement 32-bit integer. </td> |
| <td align="left"> <span class="type">cl_int</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <div class="literallayout"><p><span class="type">unsigned int</span>,<br /> |
| <span class="type">uint</span></p></div> |
| </td> |
| <td align="left"> An unsigned 32-bit integer. </td> |
| <td align="left"> <span class="type">cl_uint</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">long</span> </td> |
| <td align="left"> A signed two's complement 64-bit integer. </td> |
| <td align="left"> <span class="type">cl_long</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <div class="literallayout"><p><span class="type">unsigned long</span>,<br /> |
| <span class="type">ulong</span></p></div> |
| </td> |
| <td align="left"> An unsigned 64-bit integer. </td> |
| <td align="left"> <span class="type">cl_ulong</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">float</span> </td> |
| <td align="left"> |
| A 32-bit floating point. The float data type must conform to the |
| IEEE 754 single precision storage format. |
| </td> |
| <td align="left"> <span class="type">cl_float</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">double</span> </td> |
| <td align="left"> |
| A 64-bit floating point. The <span class="type">double</span> data type must conform to the |
| IEEE 754 double precision storage format. The <span class="type">double</span> scalar |
| type is an optional type that is supported if <code class="constant">CL_DEVICE_DOUBLE_FP_CONFIG</code> |
| for a device is not zero. See the table for <code class="varname">param_name</code> for |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> |
| for details. |
| </td> |
| <td align="left"> <span class="type">cl_double</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">half</span> </td> |
| <td align="left"> |
| A 16-bit float. The <span class="type">half</span> data type must conform to the IEEE 754-2008 |
| half precision storage format. |
| </td> |
| <td align="left"> <span class="type">cl_half</span> </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">size_t</span> </td> |
| <td align="left"> |
| The unsigned integer type of the result of the sizeof |
| operator. This is a 32-bit unsigned integer if <code class="constant">CL_DEVICE_ADDRESS_BITS</code> |
| defined in <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> |
| is 32-bits and is a 64-bit unsigned integer if <code class="constant">CL_DEVICE_ADDRESS_BITS</code> |
| is 64-bits. |
| </td> |
| <td align="left"> n/a </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">ptrdiff_t</span> </td> |
| <td align="left"> |
| A signed integer type that is the result of subtracting two pointers. |
| This is a 32-bit signed integer if <code class="constant">CL_DEVICE_ADDRESS_BITS</code> defined in |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> |
| is 32-bits and is a 64-bit signed integer if <code class="constant">CL_DEVICE_ADDRESS_BITS</code> |
| is 64-bits. |
| </td> |
| <td align="left"> n/a </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">intptr_t</span> </td> |
| <td align="left"> |
| A signed integer type with the property that any valid pointer to |
| <span class="type">void</span> can be converted to this type, then converted back |
| to pointer to <span class="type">void</span>, and the result will compare equal |
| to the original pointer. This is a 32-bit signed integer if |
| <code class="constant">CL_DEVICE_ADDRESS_BITS</code> defined in table 4.3 is |
| 32-bits and is a 64-bit signed integer if <code class="constant">CL_DEVICE_ADDRESS_BITS</code> |
| is 64-bits. |
| </td> |
| <td align="left"> n/a </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">uintptr_t</span> </td> |
| <td align="left"> |
| An unsigned integer type with the property that any valid pointer to |
| <span class="type">void</span> can be converted to this type, then converted back |
| to pointer to <span class="type">void</span>, and the result will compare equal to |
| the original pointer. This is a 32-bit signed integer if |
| <code class="constant">CL_DEVICE_ADDRESS_BITS</code> defined in table 4.3 is |
| 32-bits and is a 64-bit signed integer if <code class="constant">CL_DEVICE_ADDRESS_BITS</code> |
| is 64-bits. |
| </td> |
| <td align="left"> n/a </td> |
| </tr> |
| <tr> |
| <td align="left"> <span class="type">void</span> </td> |
| <td align="left"> |
| The <span class="type">void</span> type comprises an empty set of values; it is an |
| incomplete type that cannot be completed. |
| </td> |
| <td align="left"> <span class="type">void</span> </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="optional"></a> |
| <h2>Optional Half Floating Point</h2> |
| <p> |
| The <span class="type">half</span> floating-point is supported as an optional |
| extension. An application that wants to use <span class="type">half</span> |
| and <span class="type">half<em class="replaceable"><code>n</code></em></span> will need to include the |
| <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">#pragma OPENCL EXTENSION cl_khr_fp16 |
| : enable</span></span></a> directive. This will extended the list of |
| built-in vector and scalar data types to include the following: |
| </p> |
| <p> |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" 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"> |
| <span class="type">half2</span> |
| </td> |
| <td align="left">A 2-component half-precision floating-point vector.</td> |
| <td align="left"> |
| <span class="type">cl_half2</span> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <span class="type">half3</span> |
| </td> |
| <td align="left">A 3-component half-precision floating-point vector.</td> |
| <td align="left"> |
| <span class="type">cl_half3</span> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <span class="type">half4</span> |
| </td> |
| <td align="left">A 4-component half-precision floating-point vector.</td> |
| <td align="left"> |
| <span class="type">cl_half4</span> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <span class="type">half8</span> |
| </td> |
| <td align="left">An 8-component half-precision floating-point vector.</td> |
| <td align="left"> |
| <span class="type">cl_half8</span> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <span class="type">half16</span> |
| </td> |
| <td align="left">A 16-component half-precision floating-point vector.</td> |
| <td align="left"> |
| <span class="type">cl_half16</span> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| </p> |
| <p> |
| The relational, equality, logical and logical unary operators 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 h and H suffix on floating point literals, indicating |
| the literal is typed as a <span class="type">half</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-2.1-openclc.pdf#page=6" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="macroLimits.html"><span class="citerefentry"><span class="refentrytitle">Macros and Limits</span></span></a>, |
| <a class="citerefentry" href="vectorDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Vector Data Types</span></span></a>, |
| <a class="citerefentry" href="reservedDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Reserved Data Types</span></span></a>, |
| <a class="citerefentry" href="otherDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Other Data Types</span></span></a>, |
| <a class="citerefentry" href="abstractDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Abstract Data Types</span></span></a>, |
| <a class="citerefentry" href="enums.html"><span class="citerefentry"><span class="refentrytitle">Enumerated Data Types</span></span></a>, |
| <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>, |
| <a class="citerefentry" href="cl_khr_fp64.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp64</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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