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<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="idm1"></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 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="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=252" 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 © 2007-2011 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
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