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    <title>vload_halfn</title>
    <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
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    <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="vload_halfn"></a>
        <h1>vload_halfn</h1>
        <p>
            Read a half float vector from a pointer to memory.
        </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">
                    <a class="link" href="vectorDataTypes.html" target="_top">float<em class="replaceable"><code>n</code></em></a>
                    <strong class="fsfunc">                   
                        vload_half<em class="replaceable">n</em>
                    </strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">offset</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="global.html" target="_top">__global</a> <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">half</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</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">
                    <a class="link" href="vectorDataTypes.html" target="_top">float<em class="replaceable"><code>n</code></em></a>
                    <strong class="fsfunc">                   
                        vload_half<em class="replaceable">n</em>
                    </strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">offset</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="local.html" target="_top">__local</a> <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">half</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</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">
                    <a class="link" href="vectorDataTypes.html" target="_top">float<em class="replaceable"><code>n</code></em></a>
                    <strong class="fsfunc">                   
                        vload_half<em class="replaceable">n</em>
                    </strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">offset</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="constant.html" target="_top">__constant</a> <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">half</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</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">
                    <a class="link" href="vectorDataTypes.html" target="_top">float<em class="replaceable"><code>n</code></em></a>
                    <strong class="fsfunc">                   
                        vload_half<em class="replaceable">n</em>
                    </strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">offset</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="private.html" target="_top">__private</a> <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">half</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
        Read <code class="constant">sizeof(<span class="type">half<code class="varname">n</code></span>)</code> bytes of data from address (<code class="varname">p</code> + (<code class="varname">offset</code> * <code class="varname">n</code>)). The data read is interpreted as a half<code class="varname">n</code> value.
        </p>
        <p>
The half<code class="varname">n</code> value read is converted to a float<code class="varname">n</code> value and the float<code class="varname">n</code> value is returned. The read address computed as (<code class="varname">p</code> + (<code class="varname">offset</code> * <code class="varname">n</code>)) must be 16-bit aligned.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
            Vector Data Load and Store Functions allow you to read and write vector types
            from a pointer to memory. 
        </p>
        <p>
            The results of vector data load and store functions are undefined if the address being read from
            or written to is not correctly aligned. The pointer argument <code class="varname">p</code> can be a
            pointer to <a class="citerefentry" href="global.html"><span class="citerefentry"><span class="refentrytitle">__global</span></span></a>, 
            <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a>, or 
            <a class="citerefentry" href="private.html"><span class="citerefentry"><span class="refentrytitle">__private</span></span></a> memory 
            for store functions. The pointer argument <code class="varname">p</code> can be a pointer to 
            __global, __local, <a class="citerefentry" href="constant.html"><span class="citerefentry"><span class="refentrytitle">__constant</span></span></a> 
            or __private memory for load functions.
        </p>
        <p>
        <code class="function">vload3</code> and <code class="function">vload_half3</code> read <code class="varname">x</code>, <code class="varname">y</code>, <code class="varname">z</code> components from address (<code class="varname">p</code> + (<code class="varname">offset</code> * 3)) into a 3-component vector. <code class="function">vstore3</code>, and <code class="function">vstore_half3</code> write <code class="varname">x</code>, <code class="varname">y</code>, <code class="varname">z</code> components from a 3-component vector to address (<code class="varname">p</code> + (<code class="varname">offset</code> * 3)).
        </p>
        <p>
In addition <code class="function">vloada_half3</code> reads <code class="varname">x</code>, <code class="varname">y</code>, <code class="varname">z</code> components from address (<code class="varname">p</code> + (<code class="varname">offset</code> * 4)) into a 3-
component vector and <code class="function">vstorea_half3</code> writes <code class="varname">x</code>, <code class="varname">y</code>, <code class="varname">z</code> components from a 3-component vector to
address (<code class="varname">p</code> + (<code class="varname">offset</code> * 4)).
        </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-1.1.pdf#page=220" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="vectorDataLoadandStoreFunctions.html"><span class="citerefentry"><span class="refentrytitle">Vector Data Load and Store 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 © 2007-2010 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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