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| <title>EXTENSION</title> |
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| <meta name="keywords" content=" EXTENSION " /> |
| </head> |
| <body> |
| <div class="refentry"> |
| <a id="idm1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="EXTENSION"></a> |
| <h1>EXTENSION</h1> |
| <p> |
| A #pragma directive to set the behavior for OpenCL extensions. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
| <table class="informaltable" border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| #pragma OPENCL EXTENSION <code class="varname">extension_name</code> : <code class="varname">behavior</code> |
| #pragma OPENCL EXTENSION all : <code class="varname">behavior</code> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="parameters"></a> |
| <h2>Parameters</h2> |
| <div class="variablelist"> |
| <dl class="variablelist"> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| extension_name |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The name of the extension. The extension_name will have names of the form <code class="function">cl_khr_</code><<code class="varname">name</code>> for an extension approved by the OpenCL working group and will have |
| names of the form <code class="function">cl_</code><<code class="varname">vendor_name</code>>_<<code class="varname">name</code>> for vendor extensions. The token <code class="function">all</code> means that the behavior applies to all extensions supported by the compiler. The table below shows the legal values for <code class="varname">extension_name</code>: |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">Extension name</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_fp64.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_fp64</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Double precision floating-point</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_select_fprounding_mode.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_select_fprounding_mode</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Specify rounding mode</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_global_int32_base_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_global_int32_base_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">32-bit global integer base atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_global_int32_extended_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_global_int32_extended_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">32-bit global integer extended atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_local_int32_base_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_local_int32_base_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">32-bit local integer base atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_local_int32_extended_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_local_int32_extended_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">32-bit local integer extended atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_int64_base_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_int64_base_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">64-bit integer base atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_int64_extended_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_int64_extended_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">64-bit integer extended atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_3d_image_writes.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_3d_image_writes</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Writes to 3D image objects</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_byte_addressable_store.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_byte_addressable_store</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Allow byte addressible stores</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_fp16.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_fp16</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Half-precision floating-point</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="gl_sharing.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">CL_APPLE_gl_sharing</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">MacOS X OpenGL sharing</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="gl_sharing.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">CL_KHR_gl_sharing</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">OpenGL sharing</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| behavior |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| One of the following values: |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">behavior</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left">require</td> |
| <td align="left"><div class="literallayout"><p>Behave as specified by the extension <code class="varname">extension_name</code>.<br /> |
| <br /> |
| Report an error on the <code class="function">#pragma OPENCL EXTENSION</code> if the<br /> |
| <code class="varname">extension_name</code> is not supported, or if <code class="function">all</code> is specified.</p></div> |
| </td> |
| </tr> |
| <tr> |
| <td align="left">disable</td> |
| <td align="left">Behave (including issuing errors and warnings) as if the extension <code class="varname">extension_name</code> is not part of the language definition. |
| |
| If <code class="function">all</code> is specified, then behavior must revert back to that of the non-extended core version of the language being compiled to. |
| |
| Warn on the <code class="function">#pragma OPENCL EXTENSION</code> if the extension <code class="varname">extension_name</code> is not supported. |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The <code class="function">#pragma OPENCL EXTENSION</code> directive is a simple, low-level mechanism to set the behavior for each extension. It does not define policies such as which combinations are appropriate; those must be defined elsewhere. The order of directives matter in setting the behavior for each extension. Directives that occur later override those seen earlier. The <code class="function">all</code> |
| variant sets the behavior for all extensions, overriding all previously issued extension directives, but only if the <code class="varname">behavior</code> is set to <code class="function">disable</code>. |
| </p> |
| <p> |
| The initial state of the compiler is as if the directive <code class="constant">#pragma OPENCL EXTENSION all : disable</code> was issued, telling the compiler that all error and warning reporting must be done according to this specification, ignoring any extensions. |
| </p> |
| <p> |
| Every extension which affects the OpenCL language semantics, syntax or adds built-in functions to the language must create a preprocessor <code class="constant">#define</code> that matches the extension name string. This <code class="constant">#define</code> would be available in the language if and only if the extension is supported on a given implementation. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="example1"></a> |
| <h3> |
| Example |
| </h3> |
| <p> |
| An extension which adds the extension string "<code class="function">cl_khr_fp64</code>" should also add a preprocessor |
| <code class="function">#define</code> called <code class="function">cl_khr_fp64</code>. A kernel can now use this preprocessor <code class="constant">#define</code> to do something like the following: |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| #ifdef cl_khr_fp64 |
| // do something using the extension |
| #else |
| // do something else or #error! |
| #endif |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </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-1.0.pdf#page=223" target="OpenCL Spec">OpenCL Specification</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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