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</style>
<title>macros and limits</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
<meta name="keywords" content="macros, limits" />
</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="limits"></a>
<h1>Macros and Limits</h1>
<p>
Macros for math limits.
</p>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
The macro names given in the following list must use the values specified. These constant
expressions are suitable for use in <code class="code">#if</code> preprocessing directives.
</p>
<p>
</p>
<div class="informaltable">
<table class="informaltable" border="0">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
</colgroup>
<tbody>
<tr>
<td align="left">
<code class="code">#define FLT_DIG</code>
</td>
<td align="left">
<code class="code">6</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_MANT_DIG</code>
</td>
<td align="left">
<code class="code">24</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_MAX_10_EXP</code>
</td>
<td align="left">
<code class="code">+38</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_MAX_EXP</code>
</td>
<td align="left">
<code class="code">+128</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_MIN_10_EXP</code>
</td>
<td align="left">
<code class="code">-37</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_MIN_EXP</code>
</td>
<td align="left">
<code class="code">-125</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_RADIX</code>
</td>
<td align="left">
<code class="code">2</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_MAX</code>
</td>
<td align="left">
<code class="code">0x1.fffffep127f</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_MIN</code>
</td>
<td align="left">
<code class="code">0x1.0p-126f</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define FLT_EPSILON</code>
</td>
<td align="left">
<code class="code">0x1.0p-23f</code>
</td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
The macro names given in the following list (available if the double precision
option is supported) must use the values specified. These constant expressions
are suitable for use in <code class="code">#if</code> preprocessing directives.
</p>
<p>
</p>
<div class="informaltable">
<table class="informaltable" border="0">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
</colgroup>
<tbody>
<tr>
<td align="left"><code class="code">#define DBL_DIG</code> </td>
<td align="left">
<code class="code">15</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_MANT_DIG</code> </td>
<td align="left">
<code class="code">53</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_MAX_10_EXP</code> </td>
<td align="left">
<code class="code">+308</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_MAX_EXP</code> </td>
<td align="left">
<code class="code">+1024</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_MIN_10_EXP</code> </td>
<td align="left">
<code class="code">-307</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_MIN_EXP</code> </td>
<td align="left">
<code class="code">-1021</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_MAX</code> </td>
<td align="left">
<code class="code">0x1.fffffffffffffp1023</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_MIN</code> </td>
<td align="left">
<code class="code">0x1.0p-1022</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define DBL_EPSILON</code> </td>
<td align="left">
<code class="code">0x1.0p-52</code>
</td>
</tr>
</tbody>
</table>
</div>
<p>
</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="code">#if</code>
preprocessing directives. 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
<code class="code">#pragma OPENCL EXTENSION
<a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> : enable</code> directive.
</p>
<p>
</p>
<div class="informaltable">
<table class="informaltable" border="0">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
</colgroup>
<tbody>
<tr>
<td align="left"><code class="code">#define HALF_DIG</code> </td>
<td align="left">
<code class="code">3</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>
</tr>
<tr>
<td align="left"><code class="code">#define HALF_MAX_10_EXP</code> </td>
<td align="left">
<code class="code">+4</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>
</tr>
<tr>
<td align="left"><code class="code">#define HALF_MIN_10_EXP</code> </td>
<td align="left">
<code class="code">-4</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>
</tr>
<tr>
<td align="left"><code class="code">#define HALF_MAX</code> </td>
<td align="left">
<code class="code">0x1.ffcp15h</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>
</tr>
<tr>
<td align="left"><code class="code">#define HALF_EPSILON</code> </td>
<td align="left">
<code class="code">0x1.0p-10h</code>
</td>
</tr>
</tbody>
</table>
</div>
<p>
</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="code">#if</code> preprocessing directives.
</p>
<p>
</p>
<div class="informaltable">
<table class="informaltable" border="0">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
</colgroup>
<tbody>
<tr>
<td align="left">
<code class="code">#define CHAR_BIT</code>
</td>
<td align="left">
<code class="code">8</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define CHAR_MAX</code>
</td>
<td align="left">
<code class="code">SCHAR_MAX</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define CHAR_MIN</code>
</td>
<td align="left">
<code class="code">SCHAR_MIN</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define INT_MAX</code>
</td>
<td align="left">
<code class="code">2147483647</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define INT_MIN</code> </td>
<td align="left">
<code class="code">(-2147483647- 1)</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define LONG_MAX</code> </td>
<td align="left">
<code class="code">0x7fffffffffffffffL</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define LONG_MIN</code> </td>
<td align="left">
<code class="code">(-0x7fffffffffffffffL- 1)</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define SCHAR_MAX</code> </td>
<td align="left">
<code class="code">127</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define SCHAR_MIN</code> </td>
<td align="left">
<code class="code">(-127 - 1)</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define SHRT_MAX</code> </td>
<td align="left">
<code class="code">32767</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define SHRT_MIN</code> </td>
<td align="left">
<code class="code">(-32767- 1)</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define UCHAR_MAX</code> </td>
<td align="left">
<code class="code">255</code>
</td>
</tr>
<tr>
<td align="left">
<code class="code">#define USHRT_MAX</code>
</td>
<td align="left">
<code class="code">65535</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define UINT_MAX</code> </td>
<td align="left">
<code class="code">0xffffffff</code>
</td>
</tr>
<tr>
<td align="left"><code class="code">#define ULONG_MAX</code> </td>
<td align="left">
<code class="code">0xffffffffffffffffUL</code>
</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="https://www.khronos.org/registry/cl/specs/opencl-2.1-openclc.pdf#page=80" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">Math Functions</span></span></a>,
<a class="citerefentry" href="mathConstants.html"><span class="citerefentry"><span class="refentrytitle">Symbolic Math Constants</span></span></a>,
<a class="citerefentry" href="FP_CONTRACT.html"><span class="citerefentry"><span class="refentrytitle">Floating Point Pragma</span></span></a>,
<a class="citerefentry" href="scalarDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Scalar Data Types</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>
</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
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"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
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