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    <title>signbit</title>
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        <a xmlns="http://www.w3.org/1999/xhtml" id="signbit"></a>
        <h1>signbit</h1>
        <p>
            Test for sign bit.
        </p>
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        <h2></h2>
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                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="_top">int</a>


                    <strong class="fsfunc">                   
                        signbit
                    </strong>
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                    <a class="link" href="scalarDataTypes.html" target="_top">int</a>

<em class="replaceable">n</em>
                    <strong class="fsfunc">                   
                        signbit
                    </strong>
                (</code>
                <td>float<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">n</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam"></var><code>)</code></td>
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        <a id="double"></a>
        <h3></h3>
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int <code class="function">signbit</code> (<span class="type">double</span>)      // if double extension enabled 

<span class="type">long<em class="replaceable"><code>n</code></em></span> <code class="function">signbit</code> (<span class="type">double<em class="replaceable"><code>n</code></em></span>)      // if double extension enabled 
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int <code class="function">signbit</code> (<span class="type">half</span>)      // if half extension enabled 

<span class="type">short<em class="replaceable"><code>n</code></em></span> <code class="function">signbit</code> (<span class="type">half<em class="replaceable"><code>n</code></em></span>)      // if half extension enabled 
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      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
The built-in function <code class="function">signbit</code> tests for sign bit. The scalar version of the function returns a 1 if the sign bit in the float is set else returns 0. The vector version of the function returns the following for each component in float<code class="varname">n</code>: <code class="varname">a</code> -1 if the sign bit in the float is set else returns 0.
		</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> or <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> to enable <span class="type">double</span> or <span class="type">half</span> respectively, then <code class="function">signbit</code> returns -1 if the sign bit in the float is set; otherwise returns 0.		
		</p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
		This function returns a 0 if the specified relation is <span class="emphasis"><em>false</em></span> and a 1 if the specified relation is <span class="emphasis"><em>true</em></span> for scalar argument types. It returns a 0 if the specified relation is <span class="emphasis"><em>false</em></span> and a -1 (i.e. all
bits set) if the specified relation is <span class="emphasis"><em>true</em></span> for vector argument types. 
		</p>
        <p>
The built-in relational functions can be used with built-in scalar or vector types as
arguments and return a scalar vector integer result. The argment type <span class="type">gentype</span> can be <span class="type">char</span>, <span class="type">char<em class="replaceable"><code>n</code></em></span>, <span class="type">uchar</span>, <span class="type">uchar<em class="replaceable"><code>n</code></em></span>, <span class="type">short</span>, <span class="type">short<em class="replaceable"><code>n</code></em></span>, <span class="type">ushort</span>, <span class="type">ushort<em class="replaceable"><code>n</code></em></span>, <span class="type">int</span>, <span class="type">intn</span>, <span class="type">uint</span>, <span class="type">uint<em class="replaceable"><code>n</code></em></span>, <span class="type">long</span>, <span class="type">long<em class="replaceable"><code>n</code></em></span>, <span class="type">ulong</span>, <span class="type">ulong<em class="replaceable"><code>n</code></em></span>, <span class="type">float</span>, and <span class="type">float<em class="replaceable"><code>n</code></em></span>. The argument type <span class="type">igentype</span> refers to signed integer vector types i.e. <span class="type">char</span>, <span class="type">char<em class="replaceable"><code>n</code></em></span>, <span class="type">short</span>, <span class="type">short<em class="replaceable"><code>n</code></em></span>, <span class="type">int</span>, <span class="type">int<em class="replaceable"><code>n</code></em></span>, <span class="type">long</span>, and <span class="type">long<em class="replaceable"><code>n</code></em></span>. The argument type <span class="type">ugentype</span> refers to unsigned integer vector types i.e. <span class="type">uchar</span>, <span class="type">uchar<em class="replaceable"><code>n</code></em></span>, <span class="type">ushort</span>, <span class="type">ushort<em class="replaceable"><code>n</code></em></span>, <span class="type">uint</span>, <span class="type">uint<em class="replaceable"><code>n</code></em></span>, <span class="type">ulong</span>, and <span class="type">ulong<em class="replaceable"><code>n</code></em></span>.
        </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>
      </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.x-latest.pdf#page=184" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="relationalFunctions.html"><span class="citerefentry"><span class="refentrytitle">Relational 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
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