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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="pagedisplay">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="pagedisplay">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="scalarDataTypes.html" target="pagedisplay">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="pagedisplay">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="pagedisplay">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 constant <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">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 sizeof(<span class="type">half<code class="varname">n</code></span>) 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 <span class="type">half<em class="replaceable"><code>n</code></em></span> value.
      </p>
        <p>
        The <span class="type">half<em class="replaceable"><code>n</code></em></span> value read is
        converted to a <span class="type">float<em class="replaceable"><code>n</code></em></span> value and the
        <span class="type">float<em class="replaceable"><code>n</code></em></span> 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 suffix <code class="varname">n</code> in the function names 
            (i.e. vload<code class="varname">n</code>, vstore<code class="varname">n</code> etc.) 
            represent <code class="varname">n</code>-element 
            vectors, where <code class="varname">n</code> = 2, 3, 4, 8 or 16.
        </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, 
          constant or private memory for load functions.
        </p>
        <p>
            NOTE: The vector data load and store functions 
            variants that take pointer arguments which 
            point to the generic address space are also supported.
        </p>
        <p>
        We use the type name <span class="type">half<em class="replaceable"><code>n</code></em></span> to represent 
        n-element vectors of <span class="type">half</span> elements.
      </p>
        <p>
        When extended by the
        <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> extension,
        the generic type <span class="type">gentype<em class="replaceable"><code>n</code></em></span> is extended to
        include <span class="type">half</span>, <span class="type">half2</span>, <span class="type">half3</span>, <span class="type">half4</span>,
        <span class="type">half8</span>, and <span class="type">half16</span>.
      </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.
      </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-2.1-openclc.pdf#page=93" 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 © 2007-2015 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
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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