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<title>Scalar Data Types</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
<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-in Scalar Data Types"></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 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">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 single precision float. 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">half</span>
</td>
<td align="left">
A 16-bit float. The half 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 <code class="function">sizeof</code> operator. This is a 32-bit unsigned integer if CL_DEVICE_ADDRESS_BITS
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 CL_DEVICE_ADDRESS_BITS 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 CL_DEVICE_ADDRESS_BITS 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 CL_DEVICE_ADDRESS_BITS 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.
</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.
</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 Double Precision and Half Floating Point</h2>
<p>
OpenCL 1.0 adds support for double precision and half floating-point as optional extensions. The <span class="type">double</span> data type must confirm to the IEEE-754 double precision storage format.
</p>
<p>
An application that wants to use <span class="type">double</span> will need to include the <a class="citerefentry" href="cl_khr_fp64.html"><span class="citerefentry"><span class="refentrytitle">#pragma OPENCL
EXTENSION cl_khr_fp64 : enable</span></span></a> directive before any double precision data type is declared in the kernel code. This will extended the list of built-in vector and scalar data types to include the following:
</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">
<span class="type">double</span>
</td>
<td align="left">A double precision float.</td>
<td align="left">
<span class="type">cl_double</span>
</td>
</tr>
<tr>
<td align="left">
<span class="type">double2</span>
</td>
<td align="left">A 2-component double vector.</td>
<td align="left">
<span class="type">cl_double2</span>
</td>
</tr>
<tr>
<td align="left">
<span class="type">double3</span>
</td>
<td align="left">A 3-component double vector.</td>
<td align="left">
<span class="type">cl_double3</span>
</td>
</tr>
<tr>
<td align="left">
<span class="type">double4</span>
</td>
<td align="left">A 4-component double vector.</td>
<td align="left">
<span class="type">cl_double4</span>
</td>
</tr>
<tr>
<td align="left">
<span class="type">double8</span>
</td>
<td align="left">An 8-component double vector.</td>
<td align="left">
<span class="type">cl_double8</span>
</td>
</tr>
<tr>
<td align="left">
<span class="type">double16</span>
</td>
<td align="left">A 16-component double vector.</td>
<td align="left">
<span class="type">cl_double16</span>
</td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
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 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>
</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-1.1.pdf#page=156" 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="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 © 2007-2010 The Khronos Group Inc.
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"Materials"), to deal in the Materials without restriction, including
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