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        <h1>atom_sub</h1>
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            64-bit atom_sub functions. 
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                        atom_sub
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                        atom_sub
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                        atom_sub
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                    volatile __local
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      <div class="refsect1">
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        <h2>Description</h2>
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            Read the 64-bit value (referred to as <code class="varname">old</code>) stored at location pointed by 
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        <p>
            An application that wants to use this extension will need to include the <code class="code">#pragma 
            OPENCL EXTENSION cl_khr_int64_base_atomics : enable</code> in the OpenCL program source.
        </p>
        <p>
            This function is performed in one atomic transaction. These transactions are atomic for the device 
            executing these atomic functions. There is no guarantee of atomicity if the atomic operations to 
            the same memory location are being performed by kernels executing on multiple devices.
        </p>
        <p>
            Atomic operations on 64-bit integers and 32-bit integers (and float) are also atomic with regard to each other.
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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-1.2.pdf#page=279" 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="atomicFunctions.html"><span class="citerefentry"><span class="refentrytitle">Atomic Functions</span></span></a>,
            <a class="citerefentry" href="atomic_sub.html"><span class="citerefentry"><span class="refentrytitle">atomic_sub</span></span></a>,
            <a class="citerefentry" href="cl_khr_int64_base_atomics.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_int64_base_atomics</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 © 2007-2011 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. 
</div>
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