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</style>
<title>select</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
<meta name="keywords" content="select" />
</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="select"></a>
<h1>select</h1>
<p>
For each component of a vector type, result[<code xmlns="http://www.w3.org/1999/xhtml" class="varname">i</code>] = if MSB of <code xmlns="http://www.w3.org/1999/xhtml" class="varname">c</code>[<code xmlns="http://www.w3.org/1999/xhtml" class="varname">i</code>] is set ? <code xmlns="http://www.w3.org/1999/xhtml" class="varname">b</code>[<code xmlns="http://www.w3.org/1999/xhtml" class="varname">i</code>] : <code xmlns="http://www.w3.org/1999/xhtml" class="varname">a</code>[<code xmlns="http://www.w3.org/1999/xhtml" class="varname">i</code>]. For scalar type, <span xmlns="http://www.w3.org/1999/xhtml" class="emphasis"><em>result</em></span> = <code xmlns="http://www.w3.org/1999/xhtml" class="varname">c</code> ? <code xmlns="http://www.w3.org/1999/xhtml" class="varname">b</code> : <code xmlns="http://www.w3.org/1999/xhtml" class="varname">a</code>.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
gentype
<strong class="fsfunc">
select
</strong>
(</code>
<td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">a</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">b</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>igentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">c</var><code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
gentype
<strong class="fsfunc">
select
</strong>
(</code>
<td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">a</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">b</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>ugentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">c</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect2">
<a id="double"></a>
<h3></h3>
<div class="informaltable">
<table class="informaltable" border="0">
<colgroup>
<col align="left" class="col1" />
</colgroup>
<tbody>
<tr>
<td align="left">
<span class="type"><a class="link" href="vectorDataTypes.html" target="pagedisplay">half<em class="replaceable"><code>n</code></em></a></span> <code class="function">select</code> (<span class="type"><a class="link" href="vectorDataTypes.html" target="_top">half<em class="replaceable"><code>n</code></em></a></span> <code class="varname">a</code>, <span class="type"><a class="link" href="vectorDataTypes.html" target="_top">half<em class="replaceable"><code>n</code></em></a></span> <code class="varname">b</code>,
<span class="type"><a class="link" href="vectorDataTypes.html" target="pagedisplay">short<em class="replaceable"><code>n</code></em></a></span> <code class="varname">c</code>) // if half extension enabled
<span class="type"><a class="link" href="vectorDataTypes.html" target="pagedisplay">half<em class="replaceable"><code>n</code></em></a></span> <code class="function">select</code> (<span class="type"><a class="link" href="vectorDataTypes.html" target="_top">half<em class="replaceable"><code>n</code></em></a></span> <code class="varname">a</code>, <span class="type"><a class="link" href="vectorDataTypes.html" target="_top">half<em class="replaceable"><code>n</code></em></a></span> <code class="varname">b</code>,
<span class="type"><a class="link" href="vectorDataTypes.html" target="pagedisplay">ushort<em class="replaceable"><code>n</code></em></a></span> <code class="varname">c</code>) // if half extension enabled
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
For each component of a vector type, result[<code class="varname">i</code>]
= if MSB of <code class="varname">c</code>[<code class="varname">i</code>]
is set ? <code class="varname">b</code>[<code class="varname">i</code>] :
<code class="varname">a</code>[<code class="varname">i</code>].
</p>
<p>
For scalar type, <span class="emphasis"><em>result</em></span> = <code class="varname">c</code>
? <code class="varname">b</code> : <code class="varname">a</code>.
</p>
<p>
<span class="type">igentype</span> and <span class="type">ugentype</span> must have the same number of elements
and bits as <span class="type">gentype</span>.
</p>
<p>
NOTE: The above definition means that the
behavior of select and the ternary operator for
vector and scalar types is dependent on different
interpretations of the bit pattern of <code class="varname">c</code>.
</p>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
General information about relational functions:
</p>
<p>
The argment type <span class="type">gentype</span> can be <span class="type">char</span>,
<span class="type">char<em class="replaceable"><code>n</code></em></span>, <span class="type">uchar</span>,
<span class="type">uchar<em class="replaceable"><code>n</code></em></span>, <span class="type">short</span>,
<span class="type">short<em class="replaceable"><code>n</code></em></span>, <span class="type">ushort</span>,
<span class="type">ushort<em class="replaceable"><code>n</code></em></span>, <span class="type">int</span>,
<span class="type">int<em class="replaceable"><code>n</code></em></span>, <span class="type">uint</span>,
<span class="type">uint<em class="replaceable"><code>n</code></em></span>, <span class="type">long</span>,
<span class="type">long<em class="replaceable"><code>n</code></em></span>, <span class="type">ulong</span>,
<span class="type">ulong<em class="replaceable"><code>n</code></em></span>, <span class="type">float</span>,
<span class="type">float<em class="replaceable"><code>n</code></em></span>, <span class="type">double</span>, and
<span class="type">double<em class="replaceable"><code>n</code></em></span>.
</p>
<p>
The argument type <span class="type">igentype</span> refers to the built-in signed integer types,
i.e. <span class="type">char</span>, <span class="type">char<em class="replaceable"><code>n</code></em></span>,
<span class="type">short</span>, <span class="type">short<em class="replaceable"><code>n</code></em></span>, <span class="type">int</span>,
<span class="type">int<em class="replaceable"><code>n</code></em></span>, <span class="type">long</span>, and
<span class="type">long<em class="replaceable"><code>n</code></em></span>.
<em class="replaceable"><code>n</code></em> is 2, 3, 4, 8, or 16.
</p>
<p>
The argument type <span class="type">ugentype</span> refers to the built-in unsigned integer types,
i.e. <span class="type">uchar</span>, <span class="type">uchar<em class="replaceable"><code>n</code></em></span>,
<span class="type">ushort</span>, <span class="type">ushort<em class="replaceable"><code>n</code></em></span>,
<span class="type">uint</span>, <span class="type">uint<em class="replaceable"><code>n</code></em></span>, <span class="type">ulong</span>,
and <span class="type">ulong<em class="replaceable"><code>n</code></em></span>. <em class="replaceable"><code>n</code></em> is 2,
3, 4, 8, or 16.
</p>
<p>
If an implementation extends this specification to support IEEE-754 flags or
exceptions, then all built-in relational functions shall proceed without raising the
<code class="varname">invalid</code> floating-point exception when one or more of the operands
are NaNs.
</p>
<p>
The built-in relational functions are extended with
<a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> to
include versions that take <span class="type">half</span>, and
<span class="type">half{2|3|4|8|16}</span> as arguments.
</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-2.0-openclc.pdf#namedest=relationalFunctions" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="relationalFunctions.html"><span class="citerefentry"><span class="refentrytitle">Relational Functions</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
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