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| <title>sign</title> |
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| <div class="refentry"> |
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| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="sign"></a> |
| <h1>sign</h1> |
| <p> |
| Sign of a value. |
| </p> |
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| <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"> |
| sign |
| </strong> |
| (</code> |
| <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var><code>)</code></td> |
| </td> |
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| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| </p> |
| <div class="informalequation"> |
| <span class="mathphrase">Returns |
| 1.0 if <span class="emphasis"><em>x</em></span> > 0, -0.0 if <span class="emphasis"><em>x</em></span> = -0.0, +0.0 if <span class="emphasis"><em>x</em></span> = +0.0, or -1.0 if <span class="emphasis"><em>x</em></span> < 0. Returns 0.0 if <span class="emphasis"><em>x</em></span> is a NaN. |
| </span> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| These all operate component-wise. |
| The description is per-component. |
| The generic type name <span class="type">gentype</span> is used to indicate that the function 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>, <span class="type">float16</span>, <span class="type">double</span>, <span class="type">double2</span>, |
| <span class="type">double3</span>, <span class="type">double4</span>, <span class="type">double8</span>, or <span class="type">double16</span> |
| as the type for the arguments. |
| </p> |
| <p> |
| The generic type name <span class="type">gentypef</span> is used to indicate that the function 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> |
| The generic type name <span class="type">gentyped</span> is used to indicate that the function can take |
| <span class="type">double</span>, <span class="type">double2</span>, <span class="type">double3</span>, <span class="type">double4</span>, |
| <span class="type">double8</span>, or <span class="type">double16</span> as the type for the arguments. |
| </p> |
| <p> |
| The built-in common functions are implemented using the round to nearest even rounding mode. |
| </p> |
| <p> |
| If extended with <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>, |
| generic type name <span class="type">gentype</span> may indicate <span class="type">half</span> and |
| <span class="type">half{2|3|4|8|16}</span> as arguments and return values. |
| </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=commonFunctions" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="commonFunctions.html"><span class="citerefentry"><span class="refentrytitle">Common 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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