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| <title>cl_khr_initialize_memory</title> |
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| <a xmlns="http://www.w3.org/1999/xhtml" id="cl_khr_initialize_memory"></a> |
| <h1>cl_khr_initialize_memory</h1> |
| <p> |
| Extension adds support for initializing local and private memory before a kernel begins execution. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
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| <colgroup> |
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| <tr> |
| <td align="left"> |
| #pragma OPENCL EXTENSION cl_khr_initialize_memory : enable |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| Memory is allocated in various forms in OpenCL both explicitly (global memory) or implicitly |
| (local, private memory). This allocation so far does not provide a straightforward mechanism to |
| initialize the memory on allocation. In other words what is lacking is the equivalent of calloc for |
| the currently supported malloc like capability. This functionality is useful for a variety of |
| reasons including ease of debugging, application controlled limiting of visibility to previous |
| contents of memory and in some cases, optimization. |
| </p> |
| <p> |
| This extension adds support for initializing local and private memory before a kernel begins |
| execution. This extension name is <code class="code">cl_khr_initialize_memory</code>. |
| </p> |
| <p> |
| Add a new context property to table 4.5 in section 4.4 |
| (see <a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>): |
| </p> |
| <div class="informaltable"> |
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| <col align="left" class="col2" /> |
| <col align="left" class="col3" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_context_properties enum</th> |
| <th align="left">Property value</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_CONTEXT_MEMORY_- |
| INITIALIZE_KHR</code> |
| </td> |
| <td align="left"> |
| <span class="type">cl_context_memory_- |
| initialize_khr</span> |
| </td> |
| <td align="left"> |
| <p> |
| Describes which memory types for the |
| context must be initialized. This is a |
| bit-field, where the following values are |
| currently supported: |
| </p> |
| |
| <p> |
| <code class="constant">CL_CONTEXT_MEMORY_INITIALIZE_LOCAL_KHR</code> – Initialize local memory |
| to zeros. |
| </p> |
| |
| <p> |
| <code class="constant">CL_CONTEXT_MEMORY_INITIALIZE_PRIVATE_KHR</code> – Initialize private |
| memory to zeros. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| Updates to section 6.9 –Restrictions: |
| </p> |
| <p> |
| |
| If the context is created with |
| <code class="constant">CL CONTEXT MEMORY INITIALIZE KHR</code>, appropriate memory |
| locations as specified by the bit-field is |
| initialized with zeroes, prior to the start of execution of |
| any kernel. The driver chooses when, prior to |
| kernel execution, the initialization of local and/or |
| private memory is performed. The only requirement |
| is there should be no values set from outside |
| the context, which can be read during a kernel execution. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="specification"></a> |
| <h2>Specification</h2> |
| <p> |
| <img src="pdficon_small1.gif" /> |
| |
| <a href="https://www.khronos.org/registry/cl/specs/opencl-2.1-extensions.pdf#page=120" 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" />Copyright © 2007-2015 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 |
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