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| </head> |
| <body class="article"> |
| <div id="header"> |
| <h1>cl_intel_required_subgroup_size</h1> |
| <div id="toc"> |
| <div id="toctitle">Table of Contents</div> |
| <noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript> |
| </div> |
| </div> |
| <div id="content"> |
| <div class="sect1"> |
| <h2 id="_name_strings">Name Strings</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p><span class="monospaced">cl_intel_required_subgroup_size</span></p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_contact">Contact</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Ben Ashbaugh, Intel (ben <em>dot</em> ashbaugh <em>at</em> intel <em>dot</em> com)</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_contributors">Contributors</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Ben Ashbaugh, Intel</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_notice">Notice</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Copyright (c) 2018 Intel Corporation. All rights reserved.</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_status">Status</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Final Draft</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_version">Version</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Built On: 2018-11-16<br> |
| Revision: 2</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_dependencies">Dependencies</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Support for OpenCL 2.1, <span class="monospaced">cl_khr_subgroups, or `cl_intel_subgroups</span> is required. |
| This extension is written against revision 23 of the OpenCL 2.1 API specification, against revision 30 of the OpenCL 2.0 OpenCL C specification, against version 31 of the OpenCL 2.0 Extensions specification, and against version 3 of the <span class="monospaced">cl_intel_subgroups</span> specification.</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>The goal of this extension is to allow programmers to optionally specify the required subgroup size for a kernel function. |
| This information is important for the correctness of many subgroup algorithms, and in some cases may be used by the compiler to generate more optimal code.</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_new_api_functions">New API Functions</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>None.</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_new_api_enums">New API Enums</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Accepted as the <em>param_name</em> parameter of <strong>clGetDeviceInfo</strong>:</p></div> |
| <div class="listingblock"> |
| <div class="content"><!-- Generator: GNU source-highlight 3.1.8 |
| by Lorenzo Bettini |
| http://www.lorenzobettini.it |
| http://www.gnu.org/software/src-highlite --> |
| <pre><tt>CL_DEVICE_SUB_GROUP_SIZES_INTEL <span style="color: #993399">0x4108</span></tt></pre></div></div> |
| <div class="paragraph"><p>Accepted as the <em>param_name</em> parameter of <strong>clGetKernelWorkGroupInfo</strong>:</p></div> |
| <div class="listingblock"> |
| <div class="content"><!-- Generator: GNU source-highlight 3.1.8 |
| by Lorenzo Bettini |
| http://www.lorenzobettini.it |
| http://www.gnu.org/software/src-highlite --> |
| <pre><tt>CL_KERNEL_SPILL_MEM_SIZE_INTEL <span style="color: #993399">0x4109</span></tt></pre></div></div> |
| <div class="paragraph"><p>Accepted as the <em>param_name</em> parameter of <strong>clGetKernelSubGroupInfo</strong> and/or |
| <strong>clGetKernelSubGroupInfoKHR</strong>:</p></div> |
| <div class="listingblock"> |
| <div class="content"><!-- Generator: GNU source-highlight 3.1.8 |
| by Lorenzo Bettini |
| http://www.lorenzobettini.it |
| http://www.gnu.org/software/src-highlite --> |
| <pre><tt>CL_KERNEL_COMPILE_SUB_GROUP_SIZE_INTEL <span style="color: #993399">0x410A</span></tt></pre></div></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_new_opencl_c_optional_attribute_qualifiers">New OpenCL C Optional Attribute Qualifiers</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>Optional __kernel qualifier:</p></div> |
| <div class="listingblock"> |
| <div class="content"><!-- Generator: GNU source-highlight 3.1.8 |
| by Lorenzo Bettini |
| http://www.lorenzobettini.it |
| http://www.gnu.org/software/src-highlite --> |
| <pre><tt><span style="font-weight: bold"><span style="color: #000000">__attribute__</span></span><span style="color: #990000">((</span><span style="font-weight: bold"><span style="color: #000000">intel_reqd_sub_group_size</span></span><span style="color: #990000">(<</span><span style="color: #009900">int</span><span style="color: #990000">>)))</span></tt></pre></div></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_modifications_to_the_opencl_api_specification">Modifications to the OpenCL API Specification</h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="_additions_to_table_4_3_opencl_device_queries">Additions to Table 4.3 - "OpenCL Device Queries"</h3> |
| <table class="tableblock frame-all grid-all" |
| style=" |
| width:100%; |
| "> |
| <col style="width:30%;"> |
| <col style="width:20%;"> |
| <col style="width:50%;"> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top" > <strong>cl_device_info</strong> </th> |
| <th class="tableblock halign-left valign-top" > Return Type </th> |
| <th class="tableblock halign-left valign-top" > Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><strong>CL_DEVICE_SUB_GROUP_SIZES_INTEL</strong></p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><span class="monospaced">size_t[]</span></p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">Returns the set of subgroup sizes supported by the device.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="sect2"> |
| <h3 id="_additions_to_table_5_21_clgetkernelworkgroupinfo_parameter_queries">Additions to Table 5.21 - "clGetKernelWorkGroupInfo parameter queries":</h3> |
| <table class="tableblock frame-all grid-all" |
| style=" |
| width:100%; |
| "> |
| <col style="width:34%;"> |
| <col style="width:33%;"> |
| <col style="width:33%;"> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top" > <strong>cl_kernel_work_group_info</strong> </th> |
| <th class="tableblock halign-left valign-top" > Return Type </th> |
| <th class="tableblock halign-left valign-top" > Info. returned in <em>param_value</em></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><strong>CL_KERNEL_SPILL_MEM_SIZE_INTEL</strong></p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><span class="monospaced">cl_ulong</span></p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">Returns the amount of spill memory used by a kernel. |
| The meaning of this value will vary from implementation-to-implementation, however a return value of 0 will always indicate that compiler was able to compile the kernel to fit into the device’s register file without spilling registers to memory.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="sect2"> |
| <h3 id="_additions_to_clgetkernelsubgroupinfo_parameter_queries">Additions to "clGetKernelSubGroupInfo parameter queries":</h3> |
| <div class="paragraph"><p>This is Table 5.22 - "<strong>clGetKernelSubGroupInfo</strong> parameter queries" in the OpenCL 2.1 API spec, in Section 9.17.2.1 for <strong>clGetKernelSubGroupInfoKHR</strong> in the OpenCL 2.0 Extensions spec, and in the section describing the changes to Section 5.9.3 for <strong>clGetKernelSubGroupInfoKHR</strong> in the <span class="monospaced">cl_intel_subgroups</span> spec:</p></div> |
| <table class="tableblock frame-all grid-all" |
| style=" |
| width:100%; |
| "> |
| <col style="width:25%;"> |
| <col style="width:25%;"> |
| <col style="width:25%;"> |
| <col style="width:25%;"> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top" > <strong>cl_kernel_sub_group_info</strong> </th> |
| <th class="tableblock halign-left valign-top" > Input Type </th> |
| <th class="tableblock halign-left valign-top" > Return Type </th> |
| <th class="tableblock halign-left valign-top" > Info. returned in <em>param_value</em></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><strong>CL_KERNEL_COMPILE_<br> |
| SUB_GROUP_SIZE_INTEL</strong></p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><span class="monospaced">ignored</span></p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><span class="monospaced">size_t</span></p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">Returns the subgroup size specified by the <span class="monospaced">__attribute__(( intel_reqd_sub_group_size(<int>) ))</span> qualifier. |
| Refer to section 6.7.2.</p> |
| <p class="tableblock">If the subgroup size is not specified using the above attribute qualifier then 0 is returned.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_modifications_to_the_opencl_c_specification">Modifications to the OpenCL C Specification</h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="_additions_to_section_6_7_2_optional_attribute_qualifiers">Additions to Section 6.7.2 - "Optional Attribute Qualifiers"</h3> |
| <div class="paragraph"><p>The optional <span class="monospaced">__attribute__((intel_reqd_sub_group_size(<int>)))</span> can be used to indicate that the kernel must be compiled and executed with the specified subgroup size. |
| When this attribute is present, <strong>get_max_sub_group_size</strong>() is guaranteed to return the specified integer value. |
| This is important for the correctness of many subgroup algorithms, and in some cases may be used by the compiler to generate more optimal code.</p></div> |
| <div class="paragraph"><p>Note that there is no guarantee for the value of <strong>get_sub_group_size</strong>() even when this attribute is present, particularly when the work-group size is not evenly divisible by the required subgroup size.</p></div> |
| <div class="paragraph"><p>Note as well that some devices may support a limited number of subgroup sizes, and that some devices may not support all language constructs with all subgroup sizes. |
| This means that some kernels may fail compilation with one required subgroup size and succeed with another required subgroup size, even if both subgroup sizes are supported by the device.</p></div> |
| <div class="paragraph"><p>Finally, note that requiring one subgroup size (particularly, a larger subgroup size) may require more spill memory than another subgroup size, and may negatively impact application performance."</p></div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_issues">Issues</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"><p>None.</p></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_revision_history">Revision History</h2> |
| <div class="sectionbody"> |
| <table class="tableblock frame-all grid-rows" |
| style=" |
| width:100%; |
| "> |
| <col style="width:4%;"> |
| <col style="width:14%;"> |
| <col style="width:14%;"> |
| <col style="width:66%;"> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top" >Rev</th> |
| <th class="tableblock halign-left valign-top" >Date</th> |
| <th class="tableblock halign-left valign-top" >Author</th> |
| <th class="tableblock halign-left valign-top" >Changes</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">1</p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">2016-07-14</p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">Ben Ashbaugh</p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock"><strong>First public revision.</strong></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">2</p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">2018-11-15</p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">Ben Ashbaugh</p></td> |
| <td class="tableblock halign-left valign-top" ><p class="tableblock">Conversion to asciidoc.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div id="footnotes"><hr></div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated |
| 2018-11-16 10:11:35 PST |
| </div> |
| </div> |
| </body> |
| </html> |
