sdk/3.0/docs/man/html/subgroupFunctions.html - external/github.com/KhronosGroup/OpenCL-Registry - Git at Google

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 <body class="manpage">
 <div id="header">
 <h1>subgroupFunctions(3) Manual Page</h1>
 <h2 id="_name">Name</h2>
 <div class="sectionbody">
 <p>subgroupFunctions - Subgroup Functions</p>
 </div>
 </div>
 <div id="content">
 <div class="sect1">
 <h2 id="_description"><a class="anchor" href="#_description"></a>Description</h2>
 <div class="sectionbody">
 <div class="admonitionblock note">
 <table>
 <tr>
 <td class="icon">
 <i class="fa icon-note" title="Note"></i>
 </td>
 <td class="content">
 The functionality described in this section <a href="https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_C.html#unified-spec" target="_blank" rel="noopener">requires</a>
 support for OpenCL C 3.0 or newer and the <code>__opencl_c_<wbr>subgroups</code> feature.
 </td>
 </tr>
 </table>
 </div>
 <div class="paragraph">
 <p>The table below describes OpenCL C programming language built-in functions that operate on a subgroup level.
 These built-in functions must be encountered by all work-items in the subgroup executing the kernel.
 For the functions below, the generic type name <code>gentype</code> may be the one of the
 supported built-in scalar data types <code>int</code>, <code>uint</code>, <code>long</code>
 <sup class="footnote">[<a id="_footnoteref_1" class="footnote" href="#_footnotedef_1" title="View footnote.">1</a>]</sup>, <code>ulong</code>, <code>half</code> <sup class="footnote">[<a id="_footnoteref_2" class="footnote" href="#_footnotedef_2" title="View footnote.">2</a>]</sup>,
 <code>float</code>, and <code>double</code> <sup class="footnote">[<a id="_footnoteref_3" class="footnote" href="#_footnotedef_3" title="View footnote.">3</a>]</sup>.</p>
 </div>
 <table class="tableblock frame-all grid-all stretch">
 <caption class="title">Table 1. Built-in Subgroup Collective Functions</caption>
 <colgroup>
 <col style="width: 50%;">
 <col style="width: 50%;">
 </colgroup>
 <thead>
 <tr>
 <th class="tableblock halign-left valign-top"><strong>Function</strong></th>
 <th class="tableblock halign-left valign-top"><strong>Description</strong></th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">int <strong>sub_group_all</strong> (int <em>predicate</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Evaluates <em>predicate</em> for all work-items in the subgroup and returns a
   non-zero value if <em>predicate</em> evaluates to non-zero for all work-items in
   the subgroup.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">int <strong>sub_group_any</strong> (int <em>predicate</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Evaluates <em>predicate</em> for all work-items in the subgroup and returns a
   non-zero value if <em>predicate</em> evaluates to non-zero for any work-items in
   the subgroup.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">gentype <strong>sub_group_broadcast</strong> (<br>
   gentype <em>x</em>, uint <em>sub_group_local_id</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Broadcast the value of <em>x</em> for work-item identified by
   <em>sub_group_local_id</em> (value returned by <strong>get_sub_group_local_id</strong>) to all
   work-items in the subgroup.</p>
 <p class="tableblock">  Behavior is undefined when the value of <em>sub_group_local_id</em> is not
   equivalent for all work-items in the subgroup.</p>
 <p class="tableblock">  Behavior is undefined when <em>sub_group_local_id</em> is greater or equal to the
   subgroup size.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">gentype <strong>sub_group_reduce_&lt;op&gt;</strong> (<br>
   gentype <em>x</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Return result of reduction operation specified by <strong>&lt;op&gt;</strong> for all values of
   <em>x</em> specified by work-items in a subgroup.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">gentype <strong>sub_group_scan_exclusive_&lt;op&gt;</strong> (<br>
   gentype <em>x</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Do an exclusive scan operation specified by <strong>&lt;op&gt;</strong> of all values specified
   by work-items in a subgroup.
   The scan results are returned for each work-item.</p>
 <p class="tableblock">  The scan order is defined by increasing subgroup local ID within the
   subgroup.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">gentype <strong>sub_group_scan_inclusive_&lt;op&gt;</strong> (<br>
   gentype <em>x</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Do an inclusive scan operation specified by <strong>&lt;op&gt;</strong> of all values specified
   by work-items in a subgroup.
   The scan results are returned for each work-item.</p>
 <p class="tableblock">  The scan order is defined by increasing subgroup local ID within the
   subgroup.</p></td>
 </tr>
 </tbody>
 </table>
 <div class="paragraph">
 <p>The <strong>&lt;op&gt;</strong> in <strong>sub_group_reduce_&lt;op&gt;</strong>, <strong>sub_group_scan_inclusive_&lt;op&gt;</strong> and <strong>sub_group_scan_exclusive_&lt;op&gt;</strong> defines the operator and can be <strong>add</strong>, <strong>min</strong> or <strong>max</strong>.</p>
 </div>
 <div class="paragraph">
 <p>The exclusive scan operation takes a binary operator <strong>op</strong> with an identity I and <em>n</em> (where <em>n</em> is the size of the sub-group) elements [a<sub>0</sub>, a<sub>1</sub>, &#8230;&#8203; a<sub>n-1</sub>] and returns [I, a<sub>0</sub>, (a<sub>0</sub> <strong>op</strong> a<sub>1</sub>), &#8230;&#8203; (a<sub>0</sub> <strong>op</strong> a<sub>1</sub> <strong>op</strong> &#8230;&#8203; <strong>op</strong> a<sub>n-2</sub>)].</p>
 </div>
 <div class="paragraph">
 <p>The inclusive scan operation takes a binary operator <strong>op</strong> with an identity I and <em>n</em> (where <em>n</em> is the size of the sub-group) elements [a<sub>0</sub>, a<sub>1</sub>, &#8230;&#8203; a<sub>n-1</sub>] and returns [a<sub>0</sub>, (a<sub>0</sub> <strong>op</strong> a<sub>1</sub>), &#8230;&#8203; (a<sub>0</sub> <strong>op</strong> a<sub>1</sub> <strong>op</strong> &#8230;&#8203; <strong>op</strong> a<sub>n-1</sub>)].</p>
 </div>
 <div class="paragraph">
 <p>If <strong>op</strong> = <strong>add</strong>, the identity I is 0.
 If <strong>op</strong> = <strong>min</strong>, the identity I is <code>INT_MAX</code>, <code>UINT_MAX</code>, <code>LONG_MAX</code>, <code>ULONG_MAX</code>, for <code>int</code>, <code>uint</code>, <code>long</code>, <code>ulong</code> types and is <code>+INF</code> for
 floating-point types.
 Similarly if <strong>op</strong> = max, the identity I is <code>INT_MIN</code>, 0, <code>LONG_MIN</code>, 0 and <code>-INF</code>.</p>
 </div>
 <div class="admonitionblock note">
 <table>
 <tr>
 <td class="icon">
 <i class="fa icon-note" title="Note"></i>
 </td>
 <td class="content">
 <div class="paragraph">
 <p>The order of floating-point operations is not guaranteed for the <strong>sub_group_reduce_&lt;op&gt;</strong>, <strong>sub_group_scan_inclusive_&lt;op&gt;</strong> and <strong>sub_group_scan_exclusive_&lt;op&gt;</strong> built-in functions that operate on <code>half</code>, <code>float</code> and <code>double</code> data types.
 The order of these floating-point operations is also non-deterministic for a given sub-group.</p>
 </div>
 </td>
 </tr>
 </table>
 </div>
 <div class="admonitionblock note">
 <table>
 <tr>
 <td class="icon">
 <i class="fa icon-note" title="Note"></i>
 </td>
 <td class="content">
 The functionality described in the following table <a href="https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_C.html#unified-spec" target="_blank" rel="noopener">requires</a> support for OpenCL C 3.0 or newer and the <code>__opencl_c_<wbr>subgroups</code>
 and <code>__opencl_c_<wbr>pipes</code> features.
 </td>
 </tr>
 </table>
 </div>
 <div class="paragraph">
 <p>The following table describes built-in pipe functions that operate at a
 subgroup level.
 These built-in functions must be encountered by all work-items in a subgroup
 executing the kernel with the same argument values, otherwise the behavior
 is undefined.
 We use the generic type name <code>gentype</code> to indicate the built-in OpenCL C
 scalar or vector integer or floating-point data types or any user defined
 type built from these scalar and vector data types can be used as the type
 for the arguments to the pipe functions listed in <em>table 6.29</em>.</p>
 </div>
 <table class="tableblock frame-all grid-all stretch">
 <caption class="title">Table 2. Built-in Subgroup Pipe Functions</caption>
 <colgroup>
 <col style="width: 50%;">
 <col style="width: 50%;">
 </colgroup>
 <thead>
 <tr>
 <th class="tableblock halign-left valign-top"><strong>Function</strong></th>
 <th class="tableblock halign-left valign-top"><strong>Description</strong></th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">reserve_id_t <strong>sub_group_reserve_read_pipe</strong> (<br>
   read_only pipe gentype <em>pipe</em>,<br>
   uint <em>num_packets</em>)</p>
 <p class="tableblock">  reserve_id_t <strong>sub_group_reserve_write_pipe</strong> (<br>
   write_only pipe gentype <em>pipe</em>,<br>
   uint <em>num_packets</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Reserve <em>num_packets</em> entries for reading from or writing to <em>pipe</em>.
   Returns a valid non-zero reservation ID if the reservation is successful
   and 0 otherwise.</p>
 <p class="tableblock">  The reserved pipe entries are referred to by indices that go from 0 &#8230;&#8203;
   <em>num_packets</em> - 1.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">void <strong>sub_group_commit_read_pipe</strong> (<br>
   read_only pipe gentype <em>pipe</em>,<br>
   reserve_id_t <em>reserve_id</em>)</p>
 <p class="tableblock">  void <strong>sub_group_commit_write_pipe</strong> (<br>
   write_only pipe gentype <em>pipe</em>,<br>
   reserve_id_t <em>reserve_id</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Indicates that all reads and writes to <em>num_packets</em> associated with
   reservation <em>reserve_id</em> are completed.</p></td>
 </tr>
 </tbody>
 </table>
 <div class="paragraph">
 <p>Note: Reservations made by a subgroup are ordered in the pipe as they are
 ordered in the program.
 Reservations made by different subgroups that belong to the same work-group
 can be ordered using subgroup synchronization.
 The order of subgroup based reservations that belong to different work
 groups is implementation defined.</p>
 </div>
 <div class="admonitionblock note">
 <table>
 <tr>
 <td class="icon">
 <i class="fa icon-note" title="Note"></i>
 </td>
 <td class="content">
 The functionality described in the following table <a href="https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_C.html#unified-spec" target="_blank" rel="noopener">requires</a> support for OpenCL C 3.0 or newer and the <code>__opencl_c_<wbr>subgroups</code>
 and <code>__opencl_c_<wbr>device_<wbr>enqueue</code> features.
 </td>
 </tr>
 </table>
 </div>
 <div class="paragraph">
 <p>The following table describes built-in functions to query subgroup
 information for a block to be enqueued.</p>
 </div>
 <table class="tableblock frame-all grid-all stretch">
 <caption class="title">Table 3. Built-in Subgroup Kernel Query Functions</caption>
 <colgroup>
 <col style="width: 55.5555%;">
 <col style="width: 44.4445%;">
 </colgroup>
 <thead>
 <tr>
 <th class="tableblock halign-left valign-top"><strong>Built-in Function</strong></th>
 <th class="tableblock halign-left valign-top"><strong>Description</strong></th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">uint <strong>get_kernel_sub_group_count_for_ndrange</strong> (<br>
   const ndrange_t <em>ndrange</em>,<br>
   void (^block)(void));</p>
 <p class="tableblock">  uint <strong>get_kernel_sub_group_count_for_ndrange</strong> (<br>
   const ndrange_t <em>ndrange</em>,<br>
   void (^block)(local void *, &#8230;&#8203;));</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the number of subgroups in each work-group of the dispatch (except
   for the last in cases where the global size does not divide cleanly into
   work-groups) given the combination of the passed ndrange and block.</p>
 <p class="tableblock">  <em>block</em> specifies the block to be enqueued.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">uint <strong>get_kernel_max_sub_group_size_for_ndrange</strong> (<br>
   const ndrange_t <em>ndrange</em>,<br>
   void (^block)(void));<br></p>
 <p class="tableblock">  uint <strong>get_kernel_max_sub_group_size_for_ndrange</strong> (<br>
   const ndrange_t <em>ndrange</em>,<br>
   void (^block)(local void *, &#8230;&#8203;));</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the maximum subgroup size for a block.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_see_also"><a class="anchor" href="#_see_also"></a>See Also</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>No cross-references are available</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_document_notes"><a class="anchor" href="#_document_notes"></a>Document Notes</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>For more information, see the <a href="https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_C.html#subgroup-functions" target="_blank" rel="noopener">OpenCL C Specification</a></p>
 </div>
 <div class="paragraph">
 <p>This page is extracted from the OpenCL C Specification.
 Fixes and changes should be made to the Specification, not directly.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_copyright"><a class="anchor" href="#_copyright"></a>Copyright</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Copyright 2014-2023 The Khronos Group Inc.</p>
 </div>
 <div class="paragraph">
 <p>SPDX-License-Identifier: CC-BY-4.0</p>
 </div>
 </div>
 </div>
 </div>
 <div id="footnotes">
 <hr>
 <div class="footnote" id="_footnotedef_1">
 <a href="#_footnoteref_1">1</a>. Only if 64-bit integers are supported. In OpenCL C 3.0 this will be indicated by the presence of the <code>__opencl_c_int64</code> feature macro.
 </div>
 <div class="footnote" id="_footnotedef_2">
 <a href="#_footnoteref_2">2</a>. Only if the <strong>cl_khr_fp16</strong> extension is supported and has been enabled.
 </div>
 <div class="footnote" id="_footnotedef_3">
 <a href="#_footnoteref_3">3</a>. Only if double precision is supported. In OpenCL C 3.0 this will be indicated by the presence of the <code>__opencl_c_fp64</code> feature macro.
 </div>
 </div>
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