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<body class="article">
<div id="header">
<h1>cl_intel_subgroups_short</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_subgroups_short</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<br>
Felix J Degrood, Intel<br>
Biju George, Intel<br>
Raun M Krisch, Intel<br>
Konstantin A Pyjov, Intel<br>
Insoo Woo, 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>OpenCL 1.2 and support for <span class="monospaced">cl_intel_subgroups</span> is required.
This extension is written against the OpenCL API Specification Version 2.2 (revision v2.2-7), against the OpenCL C Language Specification Version 2.0 (revision v2.2-7), and against version 4 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 improve the performance of applications operating on 16-bit data types by extending the subgroup functions described in the <span class="monospaced">cl_intel_subgroups</span> extension to support 16-bit integer data types (<span class="monospaced">shorts</span> and <span class="monospaced">ushorts</span>).
Specifically, the extension:</p></div>
<div class="ulist"><ul>
<li>
<p>
Extends the subgroup broadcast function to allow 16-bit integer values to be broadcast from one work item to all other work items in the subgroup.
</p>
</li>
<li>
<p>
Extends the subgroup scan and reduction functions to operate on 16-bit integer data types.
</p>
</li>
<li>
<p>
Extends the Intel subgroup shuffle functions to allow arbitrarily exchanging 16-bit integer values among work items in the subgroup.
</p>
</li>
<li>
<p>
Extends the Intel subgroup block read and write functions to allow reading and writing 16-bit integer data from images and buffers.
</p>
</li>
</ul></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>None.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_new_opencl_c_functions">New OpenCL C Functions</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Add <span class="monospaced">short</span> and <span class="monospaced">ushort</span> to the list of supported data types for the subgroup broadcast, scan, and reduction functions: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<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="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_broadcast</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x<span style="color: #990000">,</span> <span style="color: #008080">uint</span> sub_group_local_id <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_broadcast</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x<span style="color: #990000">,</span> <span style="color: #008080">uint</span> sub_group_local_id <span style="color: #990000">)</span>

<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_add</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_min</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_max</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>

<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>

<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span></tt></pre></div></div>
</div></div>
</dd>
<dt class="hdlist1">
Add <span class="monospaced">short</span>, <span class="monospaced">short2</span>, <span class="monospaced">short4</span>, <span class="monospaced">short8</span>, <span class="monospaced">short16</span>, <span class="monospaced">ushort</span>, <span class="monospaced">ushort2</span>, <span class="monospaced">ushort4</span>, <span class="monospaced">ushort8</span>, and <span class="monospaced">ushort16</span> to the list of <span class="monospaced">gentype</span> data types supported by the <span class="monospaced">sub_group_shuffle</span>, <span class="monospaced">sub_group_shuffle_down</span>, <span class="monospaced">sub_group_shuffle_up</span>, and <span class="monospaced">sub_group_shuffle_xor</span> functions: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<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="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_shuffle</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> data<span style="color: #990000">,</span> <span style="color: #008080">uint</span> c <span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_shuffle_down</span></span><span style="color: #990000">(</span>
                <span style="color: #008080">gentype</span> current<span style="color: #990000">,</span> <span style="color: #008080">gentype</span> next<span style="color: #990000">,</span> <span style="color: #008080">uint</span> delta <span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_shuffle_up</span></span><span style="color: #990000">(</span>
                <span style="color: #008080">gentype</span> previous<span style="color: #990000">,</span> <span style="color: #008080">gentype</span> current<span style="color: #990000">,</span> <span style="color: #008080">uint</span> delta <span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_shuffle_xor</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> data<span style="color: #990000">,</span> <span style="color: #008080">uint</span> value <span style="color: #990000">)</span></tt></pre></div></div>
</div></div>
</dd>
<dt class="hdlist1">
Add <span class="monospaced">ushort</span> variants of the subgroup block read and write functions: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<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="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">ushort2</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us2</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">ushort4</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us4</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">ushort8</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us8</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">ushort2</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us2</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">ushort4</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us4</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">ushort8</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us8</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>

<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us2</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us4</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us8</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort8</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us2</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us4</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us8</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort8</span> data <span style="color: #990000">)</span></tt></pre></div></div>
</div></div>
</dd>
<dt class="hdlist1">
For naming consistency, also add suffixed aliases of the <span class="monospaced">uint</span> subgroup block read and write functions described in the <span class="monospaced">cl_intel_subgroups</span> extension: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<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="color: #008080">uint</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint2</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui2</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint4</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui4</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint8</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui8</span></span><span style="color: #990000">(</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint2</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui2</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint4</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui4</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint8</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui8</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>

<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui2</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui4</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui8</span></span><span style="color: #990000">(</span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint8</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui2</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui4</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui8</span></span><span style="color: #990000">(</span> <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span> <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint8</span> data <span style="color: #990000">)</span></tt></pre></div></div>
</div></div>
</dd>
</dl></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_13_15_work_group_functions">Additions to Section 6.13.15 - "Work Group Functions"</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
Add <span class="monospaced">short</span> and <span class="monospaced">ushort</span> to the list of supported data types for the subgroup broadcast, scan, and reduction functions: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<table class="tableblock frame-all grid-all"
style="
width:100%;
">
<col style="width:66%;">
<col style="width:33%;">
<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" ><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="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_broadcast</span></span><span style="color: #990000">(</span>
          <span style="color: #008080">gentype</span> x<span style="color: #990000">,</span>
          <span style="color: #008080">uint</span> sub_group_local_id <span style="color: #990000">)</span>

<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_broadcast</span></span><span style="color: #990000">(</span>
          <span style="color: #009900">short</span> x<span style="color: #990000">,</span>
          <span style="color: #008080">uint</span> sub_group_local_id <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_broadcast</span></span><span style="color: #990000">(</span>
          <span style="color: #008080">ushort</span> x<span style="color: #990000">,</span>
          <span style="color: #008080">uint</span> sub_group_local_id <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Broadcasts 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.
<em>sub_group_local_id</em> must be the same value for all work items in the subgroup.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><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="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_reduce_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x <span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_reduce_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x <span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_reduce_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x <span style="color: #990000">)</span>

<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_add</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_min</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_max</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_reduce_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Returns the result of the specified reduction operation 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" ><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="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_scan_exclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x <span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_scan_exclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x <span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_scan_exclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x <span style="color: #990000">)</span>

<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_exclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Performs the specified exclusive scan operation of all values <em>x</em> 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" ><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="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_scan_inclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x<span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_scan_inclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x<span style="color: #990000">)</span>
<span style="color: #008080">gentype</span> <span style="font-weight: bold"><span style="color: #000000">sub_group_scan_inclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">gentype</span> x<span style="color: #990000">)</span>

<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_add</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_min</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span>
<span style="color: #009900">short</span>    <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #009900">short</span> x <span style="color: #990000">)</span>
<span style="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_scan_inclusive_max</span></span><span style="color: #990000">(</span> <span style="color: #008080">ushort</span> x <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Performs the specified inclusive scan operation of all values <em>x</em> 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></div>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_additions_to_section_6_13_x_sub_group_shuffle_functions">Additions to Section 6.13.X - "Sub Group Shuffle Functions"</h3>
<div class="paragraph"><p>This section was added by the <span class="monospaced">cl_intel_subgroups</span> extension.</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
Add <span class="monospaced">short</span>, <span class="monospaced">short2</span>, <span class="monospaced">short4</span>, <span class="monospaced">short8</span>, <span class="monospaced">short16</span>, <span class="monospaced">ushort</span>, <span class="monospaced">ushort2</span>, <span class="monospaced">ushort4</span>, <span class="monospaced">ushort8</span>, and <span class="monospaced">ushort16</span> to the list of data types supported by the <span class="monospaced">sub_group_shuffle</span>, <span class="monospaced">sub_group_shuffle_down</span>, <span class="monospaced">sub_group_shuffle_up</span>, and <span class="monospaced">sub_group_shuffle_xor</span> functions: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<div class="paragraph"><p>The OpenCL C programming language implements the following built-in functions to allow data to be exchanged among work items in a subgroup.
These built-in functions need not be encountered by all work items in a subgroup executing the kernel, however, data may only be shuffled among work items encountering the subgroup shuffle function.
Shuffling data from a work item that does not encounter the subgroup shuffle function will produce undefined results.
For these functions, <span class="monospaced">gentype</span> is <span class="monospaced">float</span>, <span class="monospaced">float2</span>, <span class="monospaced">float4</span>, <span class="monospaced">float8</span>, <span class="monospaced">float16</span>, <span class="monospaced">short</span>, <span class="monospaced">short2</span>, <span class="monospaced">short4</span>, <span class="monospaced">short8</span>, <span class="monospaced">short16</span>, <span class="monospaced">ushort</span>, <span class="monospaced">ushort2</span>, <span class="monospaced">ushort4</span>, <span class="monospaced">ushort8</span>, <span class="monospaced">ushort16</span>, <span class="monospaced">int</span>, <span class="monospaced">int2</span>, <span class="monospaced">int4</span>, <span class="monospaced">int8</span>, <span class="monospaced">int16</span>, <span class="monospaced">uint</span>, <span class="monospaced">uint2</span>, <span class="monospaced">uint4</span>, <span class="monospaced">uint8</span>, <span class="monospaced">uint16</span>, <span class="monospaced">long</span>, or <span class="monospaced">ulong</span>.</p></div>
<div class="paragraph"><p>If <span class="monospaced">cl_khr_fp16</span> is supported, <span class="monospaced">gentype</span> also includes <span class="monospaced">half</span>.</p></div>
<div class="paragraph"><p>If <span class="monospaced">cl_khr_fp64</span> or doubles are supported, <span class="monospaced">gentype</span> also includes <span class="monospaced">double</span>.</p></div>
</div></div>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_modifications_to_section_6_13_x_sub_group_read_and_write_functions">Modifications to Section 6.13.X "Sub Group Read and Write Functions"</h3>
<div class="paragraph"><p>This section was added by the <span class="monospaced">cl_intel_subgroups</span> extension.</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
Add suffixed aliases of the previously un-suffixed 32-bit block read and write functions. There is no change to the description or behavior of these functions: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<table class="tableblock frame-all grid-all"
style="
width:100%;
">
<col style="width:55%;">
<col style="width:44%;">
<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" ><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="color: #008080">uint</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint2</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read2</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint4</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read4</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint8</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read8</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>

<span style="color: #008080">uint</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint2</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui2</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint4</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui4</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">uint8</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui8</span></span><span style="color: #990000">(</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Reads 1, 2, 4, or 8 uints of data for each work item in the subgroup from the specified pointer as a block operation&#8230;</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><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="color: #008080">uint</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint2</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint4</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint8</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>

<span style="color: #008080">uint</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint2</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint4</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">uint8</span> <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_ui8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Reads 1, 2, 4, or 8 uints of data for each work item in the subgroup from the specified image at the specified coordinate as a block operation&#8230;</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><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="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint8</span> data <span style="color: #990000">)</span>

<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> uint<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">uint8</span> data <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Writes 1, 2, 4, or 8 uints of data for each work item in the subgroup to the specified pointer as a block operation&#8230;</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><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="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint8</span> data <span style="color: #990000">)</span>

<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_ui8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">uint8</span> data <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Writes 1, 2, 4, or 8 uints of data for each work item in the subgroup to the specified image at the specified coordinate as a block operation&#8230;</p></td>
</tr>
</tbody>
</table>
</div></div>
</dd>
<dt class="hdlist1">
Also, add <span class="monospaced">ushort</span> variants of the block read and write functions.  In the descriptions of these functions, the "note below describing out-of-bounds behavior" is in the <span class="monospaced">cl_intel_subgroups</span> extension specification: 
</dt>
<dd>
<div class="openblock">
<div class="content">
<table class="tableblock frame-all grid-all"
style="
width:100%;
">
<col style="width:55%;">
<col style="width:44%;">
<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" ><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="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us</span></span><span style="color: #990000">(</span>
          <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">ushort2</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us2</span></span><span style="color: #990000">(</span>
          <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">ushort4</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us4</span></span><span style="color: #990000">(</span>
          <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span>
<span style="color: #008080">ushort8</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us8</span></span><span style="color: #990000">(</span>
          <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Reads 1, 2, 4, or 8 ushorts of data for each work item in the subgroup from the specified pointer as a block operation.
The data is read strided, so the first value read is:</p>
<p class="tableblock"><span class="monospaced">p[ sub_group_local_id ]</span></p>
<p class="tableblock">and the second value read is:</p>
<p class="tableblock"><span class="monospaced">p[ sub_group_local_id + max_sub_group_size ]</span></p>
<p class="tableblock">etc.</p>
<p class="tableblock"><em>p</em> must be aligned to a 32-bit (4-byte) boundary.</p>
<p class="tableblock">There is no defined out-of-range behavior for these functions.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><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="color: #008080">ushort</span>   <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us</span></span><span style="color: #990000">(</span>
          <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
          <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">ushort2</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us2</span></span><span style="color: #990000">(</span>
          <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
          <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">ushort4</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us4</span></span><span style="color: #990000">(</span>
          <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
          <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span>
<span style="color: #008080">ushort8</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_read_us8</span></span><span style="color: #990000">(</span>
          <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
          <span style="color: #008080">int2</span> byte_coord <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Reads 1, 2, 4, or 8 ushorts of data for each work item in the subgroup from the specified <em>image</em> at the specified coordinate as a block operation.
Note that the coordinate is a byte coordinate, not an image element coordinate.
Also note that the image data is read without format conversion, so each work item may read multiple image elements
(for images with element size smaller than 16-bits).</p>
<p class="tableblock">The data is read row-by-row, so the first value read is from the row specified in the y-component of the provided <em>byte_coord</em>, the second value is read from the y-component of the provided <em>byte_coord</em> plus one, etc.</p>
<p class="tableblock">Please see the note below describing out-of-bounds behavior for these functions.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><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="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">__global</span> ushort<span style="color: #990000">*</span> p<span style="color: #990000">,</span> <span style="color: #008080">ushort8</span> data <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Writes 1, 2, 4, or 8 ushorts of data for each work item in the subgroup to the specified pointer as a block operation.
The data is written strided, so the first value is written to:</p>
<p class="tableblock"><span class="monospaced">p[ sub_group_local_id ]</span></p>
<p class="tableblock">and the second value is written to:</p>
<p class="tableblock"><span class="monospaced">p[ sub_group_local_id + max_sub_group_size ]</span></p>
<p class="tableblock">etc.</p>
<p class="tableblock"><em>p</em> must be aligned to a 128-bit (16-byte) boundary.</p>
<p class="tableblock">There is no defined out-of-range behavior for these functions.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><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="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us2</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort2</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us4</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort4</span> data <span style="color: #990000">)</span>
<span style="color: #009900">void</span>  <span style="font-weight: bold"><span style="color: #000000">intel_sub_group_block_write_us8</span></span><span style="color: #990000">(</span>
        <span style="color: #008080">image2d_t</span> image<span style="color: #990000">,</span>
        <span style="color: #008080">int2</span> byte_coord<span style="color: #990000">,</span> <span style="color: #008080">ushort8</span> data <span style="color: #990000">)</span></tt></pre></div></div></div></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Writes 1, 2, 4, or 8 ushorts of data for each work item in the subgroup to the specified <em>image</em> at the specified coordinate as a block operation.
Note that the coordinate is a byte coordinate, not an image element coordinate.
Unlike the image block read function, which may read from any arbitrary byte offset, the x-component of the byte coordinate for the image block write functions must be a multiple of four;
in other words, the write must begin at 32-bit boundary.
There is no restriction on the y-component of the coordinate.
Also, note that the image <em>data</em> is written without format conversion, so each work item may write multiple image elements (for images with element size smaller than 8-bits).</p>
<p class="tableblock">The data is written row-by-row, so the first value written is from the row specified by the y-component of the provided <em>byte_coord</em>, the second value is written from the y-component of the provided <em>byte_coord</em> plus one, etc.</p>
<p class="tableblock">Please see the note below describing out-of-bounds behavior for these functions.</p></td>
</tr>
</tbody>
</table>
</div></div>
</dd>
</dl></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">2016-10-20</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>
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<div id="footer-text">
Last updated
 2018-11-16 09:32:34 PST
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