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    <title>abs, abs_diff</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="abs"></a>
        <h1>abs, abs_diff</h1>
        <p>
            Absolute value functions.
        </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">
                    ugentype
                    <strong class="fsfunc">                   
                        abs
                    </strong>
                (</code>
                <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var><code>)</code></td>
              </td>
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          </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">
                    ugentype
                    <strong class="fsfunc">                   
                        abs_diff
                    </strong>
                (</code>
                <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">y</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
            <code class="function">abs</code> returns |<code class="varname">x</code>|.
        </p>
        <p>
            <code class="function">abs_diff</code> returns |<code class="varname">x</code>-<code class="varname">y</code>| without modulo overflow.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
            Built-in integer functions can be used to 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>.
        </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="http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf#page=211" 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 © 2007-2010 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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