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| <title>half_recip, native_recip</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="recip"></a> |
| <h1>half_recip, native_recip</h1> |
| <p> |
| Floating point reciprocal. |
| </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"> |
| half_recip |
| </strong> |
| (</code> |
| <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var><code>)</code></td> |
| </td> |
| </tr> |
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| </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"> |
| native_recip |
| </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>The <code class="function">half_recip</code> computes reciprocal.</p> |
| <p> |
| <code class="function">native_recip</code> computes reciprocal over an implementation-defined |
| range. The maximum error is implementation-defined. |
| </p> |
| <p> |
| The vector versions of the math functions operate component-wise. The description |
| is per-component. |
| </p> |
| <p> |
| The built-in math functions are not affected by the prevailing rounding mode in the |
| calling environment, and always return the same value as they would if called with |
| the round to nearest even rounding mode. |
| </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> |
| <h4><a id="id-1.5.7"></a>Half and Native forms</h4> |
| <p> |
| A subset of Math functions (table 6.8) are defined |
| with the <code class="code">half_</code> prefix. These |
| functions are implemented with a minimum of |
| 10-bits of accuracy i.e. an ULP value ≤ |
| 8192 ulp. |
| </p> |
| <p> |
| A subset of Math functions (table 6.8) are |
| defined with the <code class="code">native_</code> prefix. These |
| functions may map to one or more native device |
| instructions and will typically have |
| better performance compared to the corresponding |
| functions (without the <code class="code">native__</code> |
| prefix). The accuracy (and in some cases the |
| input range(s)) of |
| these functions is implementation-defined. |
| </p> |
| <p> |
| For the half and native forms, we use the |
| generic type name |
| gentype to indicate that the functions |
| (table 6.9) can take |
| <span class="type">float</span>, <span class="type">float2</span>, |
| <span class="type">float3</span>, |
| <span class="type">float4</span>, <span class="type">float8</span> |
| or <span class="type">float16</span> as the type for the |
| arguments. |
| </p> |
| <p> |
| Support for denormal values is optional for |
| <code class="code">half_</code> functions. The <code class="code">half_</code> |
| functions may return any |
| result allowed by section 7.5.3, even when |
| <code class="code">-cl-denorms-are-zero</code> (see section 5.8.4.2) is not in |
| force. Support for denormal values is |
| implementation-defined for <code class="code">native_</code> functions. |
| </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=72" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">Math 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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