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    <title>sign</title>
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        <h1>sign</h1>
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            Sign of a value.
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        <h2></h2>
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                    gentype
                    <strong class="fsfunc">                   
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      <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> &gt; 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> &lt; 0. Returns 0.0 if <span class="emphasis"><em>x</em></span> is a NaN.
		</span>
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        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
		Built-in common functions operate component-wise and the description is per-component. We use the generic type name <span class="type">gentype</span> to indicate that the
function can take <span class="type">float</span>, <span class="type">float2</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 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_fp64.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp64</span></span></a>, generic type name <span class="type">gentype</span> may indicate <span class="type">double</span> and <span class="type">double{2|4|8|16}</span> as arguments and return values. 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|4|8|16}</span> as arguments and return values. 
		</p>
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      <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-1.0.pdf#page=180" target="OpenCL Spec">OpenCL Specification</a>
        </p>
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      <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 © 2007-2009 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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