opencl-1.2-html-doc 1.0~svn27110-1 / usr / share / doc / opencl-1.2-html-doc / select.html

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</style>
    <title>select</title>
    <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
    <meta name="keywords" content="select" />
  </head>
  <body>
    <div class="refentry">
      <a id="idp35062212"></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 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>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <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 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>.
    </p>
        <p>
      The argument type <span class="type">ugentype</span> refers to 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 appropriate versions of functions that take <span class="type">half</span>, and
      <span class="type">half{2|3|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-1.2.pdf#page=264" 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 © 2007-2011 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
in all copies or substantial portions of the Materials. 
</div>
    </div>
  </body>
</html>

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