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| <refentry> |
| <refentryinfo> |
| <keywordset> |
| <keyword>cl_khr_int64_base_atomics</keyword> |
| </keywordset> |
| </refentryinfo> |
| |
| <refmeta> |
| <refentrytitle>cl_khr_int64_base_atomics</refentrytitle> |
| |
| <refmiscinfo> |
| <copyright> |
| <year>2007-2011</year> |
| <holder>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.</holder> |
| </copyright> |
| </refmiscinfo> |
| <manvolnum>3</manvolnum> |
| </refmeta> |
| |
| <!-- ================================ SYNOPSIS --> |
| |
| <refnamediv id="cl_khr_int64_base_atomics"> |
| <refname>cl_khr_int64_base_atomics</refname> |
| |
| <refpurpose> |
| Optional extensions that implement atomic operations on 64-bit signed and unsigned integers to locations in __global and __local memory. |
| </refpurpose> |
| </refnamediv> |
| |
| <!-- ALTERNATIVE SYNTAX SYNOPSIS (NON-FUNCTION) --> |
| |
| <refsect2 id="synopsis"> |
| <title> |
| </title> |
| |
| <informaltable frame="none"> |
| <tgroup cols="1" align="left" colsep="0" rowsep="0"> |
| <colspec colname="col1" colnum="1" /> |
| <tbody> |
| <row> |
| <entry> |
| #pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable |
| </entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </refsect2> |
| |
| <!-- ================================ DESCRIPTION --> |
| |
| <refsect1 id="description" xmlns:xlink="http://www.w3.org/1999/xlink"><title>Description</title> |
| <para> |
| An application that wants to use this extension will need to include the |
| <function>#pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable</function> |
| directive in the OpenCL program source. |
| </para> |
| |
| <para> |
| The atomic functions supported by the <function>cl_khr_int64_base_atomics</function> |
| extension are described in the following table. All of the functions listed in the |
| following table are performed in one atomic transaction. |
| </para> |
| |
| <para> |
| 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. |
| </para> |
| |
| <para> |
| Atomic operations on 64-bit integers and 32-bit integers (and float) are also atomic |
| w.r.t. each other. |
| </para> |
| |
| <informaltable frame="all"> |
| <tgroup cols="2" align="left" colsep="1" rowsep="1"> |
| <colspec colname="col1" colnum="1" /> |
| <colspec colname="col2" colnum="2" /> |
| |
| <thead> |
| <row> |
| <entry>Function</entry> |
| <entry>Description</entry> |
| </row> |
| </thead> |
| |
| <tbody> |
| <row> |
| <entry><citerefentry><refentrytitle>atom_add</refentrytitle></citerefentry></entry> |
| <entry>Compute (<varname>old</varname> + <varname>val</varname>)</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>atom_sub</refentrytitle></citerefentry></entry> |
| <entry>Compute (<varname>old</varname> - <varname>val</varname>)</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>atom_xchg</refentrytitle></citerefentry></entry> |
| <entry> Swaps the 32-bit value (<varname>old</varname>) stored at location |
| <varname>p</varname> with new value <varname>val</varname>.</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>atom_inc</refentrytitle></citerefentry></entry> |
| <entry>Compute (<varname>old</varname> + 1)</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>atom_dec</refentrytitle></citerefentry></entry> |
| <entry>Compute (<varname>old</varname> - 1)</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>atom_cmpxchg</refentrytitle></citerefentry></entry> |
| <entry>Compute (<varname>old</varname> == <varname>cmp</varname>) ? <varname>val</varname> : <varname>old</varname></entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </refsect1> |
| |
| <!-- ================================ NOTES --> |
| |
| <!-- refsect1 id="notes"><title>Notes</title> |
| <para> |
| |
| </para> |
| </refsect1 --> |
| |
| <!-- ================================ EXAMPLE --> |
| <!-- DO NOT DELETE IN CASE AN EXAMPLE IS ADDED IN THE FUTURE --> |
| <!-- |
| <refsect2 id="example1"> |
| <title> |
| Example |
| </title> |
| |
| <informaltable frame="none"> |
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| <colspec colname="col1" colnum="1" /> |
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| <entry> |
| Example goes here - it will be set in "code" type with white space preserved. |
| </entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </refsect2> |
| --> |
| |
| <!-- ================================ SPECIFICATION --> |
| <!-- Set the "uri" attribute in the <olink /> element to the "named destination" for the PDF page |
| --> |
| <refsect1 id="specification"><title>Specification</title> |
| <para> |
| <imageobject> |
| <imagedata fileref="pdficon_small1.gif" format="gif" /> |
| </imageobject> |
| |
| <olink uri="cl_khr_int64_base_atomics">OpenCL Specification</olink> |
| </para> |
| </refsect1> |
| |
| <!-- ================================ ALSO SEE --> |
| |
| <refsect1 id="seealso"><title>Also see</title> |
| <para> |
| <citerefentry><refentrytitle>EXTENSION</refentrytitle></citerefentry>, |
| <citerefentry><refentrytitle>cl_khr_int64_extended_atomics</refentrytitle></citerefentry>, |
| <citerefentry href="atomicFunctions"><refentrytitle>Atomic Functions</refentrytitle></citerefentry> |
| </para> |
| </refsect1> |
| |
| <!-- ============================== COPYRIGHT --> |
| <!-- Content included from copyright.inc.xsl --> |
| |
| <refsect3 id="Copyright"><title></title> |
| <imageobject> |
| <imagedata fileref="KhronosLogo.jpg" format="jpg" /> |
| </imageobject> |
| <para /> |
| </refsect3> |
| |
| <!-- 18-Oct-1011 --> |
| </refentry> |
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