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    <title>select</title>
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    <div class="refentry">
      <a id="idm1"></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>
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        </div>
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            <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">
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                <td align="left">
<span class="type">double<em class="replaceable"><code>n</code></em></span> <code class="function">select</code> (<span class="type">double<em class="replaceable"><code>n</code></em></span> <code class="varname">a</code>, <span class="type">double<em class="replaceable"><code>n</code></em></span> <code class="varname">b</code>,
                <span class="type">long<em class="replaceable"><code>n</code></em></span> <code class="varname">c</code>)      // if double extension enabled 

<span class="type">double<em class="replaceable"><code>n</code></em></span> <code class="function">select</code> (<span class="type">double<em class="replaceable"><code>n</code></em></span> <code class="varname">a</code>, <span class="type">double<em class="replaceable"><code>n</code></em></span> <code class="varname">b</code>,
                <span class="type">ulong<em class="replaceable"><code>n</code></em></span> <code class="varname">c</code>)      // if double extension enabled 
</td>
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            </tbody>
          </table>
        </div>
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          <table class="informaltable" border="0">
            <colgroup>
              <col align="left" class="col1" />
            </colgroup>
            <tbody>
              <tr>
                <td align="left">
<span class="type">half<em class="replaceable"><code>n</code></em></span> <code class="function">select</code> (<span class="type">half<em class="replaceable"><code>n</code></em></span> <code class="varname">a</code>, <span class="type">half<em class="replaceable"><code>n</code></em></span> <code class="varname">b</code>,
              <span class="type">short<em class="replaceable"><code>n</code></em></span> <code class="varname">c</code>)      // if half extension enabled 
		   
<span class="type">half<em class="replaceable"><code>n</code></em></span> <code class="function">select</code> (<span class="type">half<em class="replaceable"><code>n</code></em></span> <code class="varname">a</code>, <span class="type">double<em class="replaceable"><code>n</code></em></span> <code class="varname">b</code>,
              <span class="type">ushort<em class="replaceable"><code>n</code></em></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>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
The built-in relational functions can be used with built-in scalar or vector types as
arguments and return a scalar vector integer result. The argment type <span class="type">gentype</span> can be <span class="type">char</span>, <span class="type">char<code class="varname">n</code></span>, <span class="type">uchar</span>, <span class="type">uchar<code class="varname">n</code></span>, <span class="type">short</span>, <span class="type">short<code class="varname">n</code></span>, <span class="type">ushort</span>, <span class="type">ushort<code class="varname">n</code></span>, <span class="type">int</span>, <span class="type">intn</span>, <span class="type">uint</span>, <span class="type">uint<code class="varname">n</code></span>, <span class="type">long</span>, <span class="type">long<code class="varname">n</code></span>, <span class="type">ulong</span>, <span class="type">ulong<code class="varname">n</code></span>, <span class="type">float</span>, and <span class="type">float<code class="varname">n</code></span>.  The argument type <span class="type">ugentype</span> refers to unsigned integer vector types i.e. <span class="type">uchar</span>, <span class="type">uchar<code class="varname">n</code></span>, <span class="type">ushort</span>, <span class="type">ushort<code class="varname">n</code></span>, <span class="type">uint</span>, <span class="type">uint<code class="varname">n</code></span>, <span class="type">ulong</span>, and <span class="type">ulong<code class="varname">n</code></span>.
        </p>
        <p>
		If extended with <a class="citerefentry" href="cl_khr_fp64.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp64</span></span></a>, generic type name <span class="type">gentype</span> may indicate <span class="type">double</span> and <span class="type">double{2|4|8|16}</span> as arguments and return values. If extended with <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>, generic type name <span class="type">gentype</span> may indicate <span class="type">half</span> and <span class="type">half{2|4|8|16}</span> as arguments and return values. 
		</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-1.0.pdf#page=184" 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 © 2007-2009 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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