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| <title>hadd, rhadd</title> |
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| </head> |
| <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="hadd"></a> |
| <h1>hadd, rhadd</h1> |
| <p> |
| Returns (<code xmlns="http://www.w3.org/1999/xhtml" class="varname">x</code> + <code xmlns="http://www.w3.org/1999/xhtml" class="varname">y</code>) >> 1, or (<code xmlns="http://www.w3.org/1999/xhtml" class="varname">x</code> + <code xmlns="http://www.w3.org/1999/xhtml" class="varname">y</code> + 1) >> 1 |
| </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"> |
| hadd |
| </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 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"> |
| rhadd |
| </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">hadd</code> returns (<code class="varname">x</code>+<code class="varname">y</code>) >> |
| 1. The intermediate sum does not modulo overflow. |
| </p> |
| <p> |
| <code class="function">rhadd</code> returns (<code class="varname">x</code>+<code class="varname">y</code>+1) |
| >> 1. The intermediate sum does not modulo overflow. |
| </p> |
| <p> |
| Frequently vector operations need n + 1 bits temporarily to calculate a result. The |
| <code class="function">rhadd</code> instruction gives you an extra bit without needing to |
| upsample and downsample. This can be a profound performance win. |
| </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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