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

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    <title>vload[n]</title>
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    <div class="refentry">
      <a id="idp41320220"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="vloadn"></a>
        <h1>vloadn</h1>
        <p>
            Read vectors 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">
                    gentype<em class="replaceable">n</em>
                    <strong class="fsfunc">
                        vload<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="global.html" target="pagedisplay">__global</a> gentype
                     <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">
                    gentype<em class="replaceable">n</em>
                    <strong class="fsfunc">
                        vload<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="local.html" target="pagedisplay">__local</a> gentype  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var>
                <code>)</code></td>
            </tr>
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        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    gentype<em class="replaceable">n</em>
                    <strong class="fsfunc">
                        vload<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="constant.html" target="pagedisplay">__constant</a> gentype  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var>
                <code>)</code></td>
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    gentype<em class="replaceable">n</em>
                    <strong class="fsfunc">
                        vload<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="private.html" target="pagedisplay">__private</a> gentype
                     <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>
         Return sizeof (<span class="type">gentype<em class="replaceable"><code>n</code></em></span>) bytes of data read
         from address (<code class="varname">p</code> + (<code class="varname">offset</code> * <code class="varname">n</code>)).
       </p>
        <p>
         The address computed as (<code class="varname">p</code> + (<code class="varname">offset</code> *
         <code class="varname">n</code>)) must be 8-bit aligned if <span class="type">gentype</span> is <span class="type">char</span>
         or <span class="type">uchar</span>; 16-bit aligned if <span class="type">gentype</span> is <span class="type">short</span>
         or <span class="type">ushort</span>; 32-bit aligned if <span class="type">gentype</span> is <span class="type">int</span>,
         <span class="type">uint</span>, or <span class="type">float</span>; 64-bit aligned if <span class="type">gentype</span>
         is <span class="type">long</span> or  <span class="type">ulong</span>.
       </p>
        <p>
         If the <span class="type">half</span> extension is enabled, the 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 generic type <span class="type">gentype</span> is used to indicate the built-in data types
          <span class="type">char</span>, <span class="type">uchar</span>, <span class="type">short</span>, <span class="type">ushort</span>,
          <span class="type">int</span>, <span class="type">uint</span>, <span class="type">long</span>, <span class="type">ulong</span>,
          <span class="type">float</span>, or <span class="type">double</span>.
        </p>
        <p>
          The generic type name <span class="type">gentype<em class="replaceable"><code>n</code></em></span>
          represents <em class="replaceable"><code>n</code></em>-element vectors of <span class="type">gentype</span>
          elements. The suffix <em class="replaceable"><code>n</code></em> is also used in the
          function names (i.e.  <code class="function">vload<em class="replaceable"><code>n</code></em></code>,
          <code class="function">vstore<em class="replaceable"><code>n</code></em></code>, etc.), where
          <em class="replaceable"><code>n</code></em> = 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, <a class="citerefentry" href="constant.html"><span class="citerefentry"><span class="refentrytitle">__constant</span></span></a> or __private
          memory for load functions.
        </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="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=267" 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 © 2007-2011 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>
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