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    <title>clz</title>
    <meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
    <meta name="keywords" content="clz" />
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  <body>
    <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="clz"></a>
        <h1>clz</h1>
        <p>
            Returns the number of leading 0-bits in <code xmlns="http://www.w3.org/1999/xhtml" class="varname">x</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">
                        clz
                    </strong>
                (</code>
                <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var><code>)</code></td>
              </td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
          <code class="function">clz</code> returns the number of leading 0-bits in <code class="varname">x</code>,
          starting at the most significant bit position.
          If <code class="varname">x</code> is 0, 
          returns the size in bits of the type of <code class="varname">x</code> or
          component type of <code class="varname">x</code>, if <code class="varname">x</code> is a vector.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          General information about built-in integer functions:
           Built-in integer functions take
          scalar or vector arguments. The vector versions of the integer functions operate
          component-wise. The description is per component.
        </p>
        <p>
          We use the generic type name <span class="type">gentype</span> to indicate that the function
          can take <span class="type">char</span>, <span class="type">char{2|3|4|8|16}</span>, <span class="type">uchar</span>,
          <span class="type">uchar{2|3|4|8|16}</span>, <span class="type">short</span>, <span class="type">short{2|3|4|8|16}</span>,
          <span class="type">ushort</span>, <span class="type">ushort{2|3|4|8|16}</span>, <span class="type">int</span>,
          <span class="type">int{2|3|4|8|16}</span>, <span class="type">uint</span>, <span class="type">uint{2|3|4|8|16}</span>,
          <span class="type">long</span>, <span class="type">long{2|3|4|8|16}</span>, <span class="type">ulong</span>, or
          <span class="type">ulong{2|3|4|8|16}</span> as the type for the arguments.  We use the generic type
          name <span class="type">ugentype</span> to refer to unsigned versions of <span class="type">gentype</span>. For
          example, if <span class="type">gentype</span> is <span class="type">char4</span>, <span class="type">ugentype</span> is
          <span class="type">uchar4</span>.
        </p>
        <p>
          We also use the generic type name <span class="type">sgentype</span> to indicate that the function can
          take a scalar data type i.e. <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>, or
          <span class="type">ulong</span> as the type for the arguments.  For built-in integer functions that
          take <span class="type">gentype</span> and <span class="type">sgentype</span> arguments, the <span class="type">gentype</span>
          argument must be a vector or scalar version of the <span class="type">sgentype</span> argument. For
          example, if <span class="type">sgentype</span> is <span class="type">uchar</span>, <span class="type">gentype</span>
          must be <span class="type">uchar</span> or <span class="type">uchar{2|3|4|8|16}</span>.  For vector versions,
          <span class="type">sgentype</span> is implicitly widened to <span class="type">gentype</span> as described in section 6.3.a
          of the OpenCL specification.
        </p>
        <p>
          For any specific use of a function, the actual type has to be the same for all
          arguments and the return type unless otherwise specified.
        </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-2.0-openclc.pdf#namedest=integerFunctions" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="integerFunctions.html"><span class="citerefentry"><span class="refentrytitle">Integer 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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