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| <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="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> |
| </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">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> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="informaltable"> |
| <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. |
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