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/* ========================================================================== HTML5 display definitions ========================================================================== */
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#header .details span.email a { color: #333333; }
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#header .details br + span:before { content: "\00a0\2013\00a0"; }
#header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: #333333; }
#header .details br + span#revremark:before { content: "\00a0|\00a0"; }
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.admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { text-rendering: optimizeLegibility; text-align: left; }

table.tableblock > caption.title { white-space: nowrap; overflow: visible; max-width: 0; }

.paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { color: black; }

table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p { font-size: inherit; }

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.admonitionblock > table td.icon .title { font-weight: bold; font-family: Noto, sans-serif; text-transform: uppercase; }
.admonitionblock > table td.content { padding-left: 1.125em; padding-right: 1.25em; border-left: 1px solid #dddddd; color: #5e93b8; }
.admonitionblock > table td.content > :last-child > :last-child { margin-bottom: 0; }

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.exampleblock > .content > :first-child { margin-top: 0; }
.exampleblock > .content > :last-child { margin-bottom: 0; }

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<body class="book">
<div id="header">
<h1>cl_intel_subgroups_long</h1>
<div class="details">
<span id="revnumber">version V2.2-11-93-g2eccabe,</span>
<span id="revdate">Fri, 13 Mar 2020 20:13:54 +0000</span>
<br><span id="revremark">from git branch: cl_intel_subgroups_char_long commit: 2eccabe9a2ee707c76ba080b99c0edfe95f199a1</span>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_name_strings">Name Strings</h2>
<div class="sectionbody">
<div class="paragraph">
<p><code>cl_intel_subgroups_long</code></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_contact">Contact</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Ben Ashbaugh, Intel (ben 'dot' ashbaugh 'at' intel 'dot' com)</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_contributors">Contributors</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Ben Ashbaugh, Intel<br>
Konrad Trifunovic, Intel</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_notice">Notice</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright (c) 2020 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: 2020-03-13<br>
Revision: 1</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 <code>cl_intel_subgroups</code> 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 <code>cl_intel_subgroups</code> specification.</p>
</div>
<div class="paragraph">
<p>This extension requires OpenCL support for SPIR-V, either via OpenCL 2.1 or via the <code>cl_khr_il_program</code> extension.</p>
</div>
<div class="paragraph">
<p>This extension interacts with the <code>cl_intel_spirv_subgroups</code> extension.</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 64-bit data types by extending the subgroup functions described in the <code>cl_intel_subgroups</code> extension to support 64-bit integer data types (<code>longs</code> and <code>ulongs</code>).
Specifically, the extension:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Extends the Intel subgroup block read and write functions to allow reading and writing 64-bit integer data from images and buffers.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Note that <code>cl_intel_subgroups</code> and <code>cl_khr_subgroups</code> already support broadcasts, scans, and reductions for 64-bit integer types, and that <code>cl_intel_subgroups</code> already supports shuffles for 64-bit integer types.</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>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 <code>ulong</code> variants of the subgroup block read and write functions: </dt>
<dd>
<div class="openblock">
<div class="content">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>ulong   intel_sub_group_block_read_ul( const __global ulong* p )
ulong2  intel_sub_group_block_read_ul2( const __global ulong* p )
ulong4  intel_sub_group_block_read_ul4( const __global ulong* p )
ulong8  intel_sub_group_block_read_ul8( const __global ulong* p )
ulong   intel_sub_group_block_read_ul( image2d_t image, int2 byte_coord )
ulong2  intel_sub_group_block_read_ul2( image2d_t image, int2 byte_coord )
ulong4  intel_sub_group_block_read_ul4( image2d_t image, int2 byte_coord )
ulong8  intel_sub_group_block_read_ul8( image2d_t image, int2 byte_coord )

void  intel_sub_group_block_write_ul( __global ulong* p, ulong data )
void  intel_sub_group_block_write_ul2( __global ulong* p, ulong2 data )
void  intel_sub_group_block_write_ul4( __global ulong* p, ulong4 data )
void  intel_sub_group_block_write_ul8( __global ulong* p, ulong8 data )
void  intel_sub_group_block_write_ul( image2d_t image, int2 byte_coord, ulong data )
void  intel_sub_group_block_write_ul2( image2d_t image, int2 byte_coord, ulong2 data )
void  intel_sub_group_block_write_ul4( image2d_t image, int2 byte_coord, ulong4 data )
void  intel_sub_group_block_write_ul8( image2d_t image, int2 byte_coord, ulong8 data )</code></pre>
</div>
</div>
</div>
</div>
</dd>
<dt class="hdlist1">For naming consistency, also add suffixed aliases of the <code>uint</code> subgroup block read and write functions described in the <code>cl_intel_subgroups</code> extension: </dt>
<dd>
<div class="openblock">
<div class="content">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>uint  intel_sub_group_block_read_ui( const __global uint* p )
uint2 intel_sub_group_block_read_ui2( const __global uint* p )
uint4 intel_sub_group_block_read_ui4( const __global uint* p )
uint8 intel_sub_group_block_read_ui8( const __global uint* p )
uint  intel_sub_group_block_read_ui( image2d_t image, int2 byte_coord )
uint2 intel_sub_group_block_read_ui2( image2d_t image, int2 byte_coord )
uint4 intel_sub_group_block_read_ui4( image2d_t image, int2 byte_coord )
uint8 intel_sub_group_block_read_ui8( image2d_t image, int2 byte_coord )

void  intel_sub_group_block_write_ui( __global uint* p, uint data )
void  intel_sub_group_block_write_ui2( __global uint* p, uint2 data )
void  intel_sub_group_block_write_ui4( __global uint* p, uint4 data )
void  intel_sub_group_block_write_ui8( __global uint* p, uint8 data )
void  intel_sub_group_block_write_ui( image2d_t image, int2 byte_coord, uint data )
void  intel_sub_group_block_write_ui2( image2d_t image, int2 byte_coord, uint2 data )
void  intel_sub_group_block_write_ui4( image2d_t image, int2 byte_coord, uint4 data )
void  intel_sub_group_block_write_ui8( image2d_t image, int2 byte_coord, uint8 data )</code></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="_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 <code>cl_intel_subgroups</code> 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 stretch">
<colgroup>
<col style="width: 55.5555%;">
<col style="width: 44.4445%;">
</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"><div class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">uint  intel_sub_group_block_read(
        const __global uint* p )
uint2 intel_sub_group_block_read2(
        const __global uint* p )
uint4 intel_sub_group_block_read4(
        const __global uint* p )
uint8 intel_sub_group_block_read8(
        const __global uint* p )

uint  intel_sub_group_block_read_ui(
        const __global uint* p )
uint2 intel_sub_group_block_read_ui2(
        const __global uint* p )
uint4 intel_sub_group_block_read_ui4(
        const __global uint* p )
uint8 intel_sub_group_block_read_ui8(
        const __global uint* p )</code></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;&#8203;</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">uint  intel_sub_group_block_read(
        image2d_t image,
        int2 byte_coord )
uint2 intel_sub_group_block_read2(
        image2d_t image,
        int2 byte_coord )
uint4 intel_sub_group_block_read4(
        image2d_t image,
        int2 byte_coord )
uint8 intel_sub_group_block_read8(
        image2d_t image,
        int2 byte_coord )

uint  intel_sub_group_block_read_ui(
        image2d_t image,
        int2 byte_coord )
uint2 intel_sub_group_block_read_ui2(
        image2d_t image,
        int2 byte_coord )
uint4 intel_sub_group_block_read_ui4(
        image2d_t image,
        int2 byte_coord )
uint8 intel_sub_group_block_read_ui8(
        image2d_t image,
        int2 byte_coord )</code></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;&#8203;</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">void  intel_sub_group_block_write(
        __global uint* p, uint data )
void  intel_sub_group_block_write2(
        __global uint* p, uint2 data )
void  intel_sub_group_block_write4(
        __global uint* p, uint4 data )
void  intel_sub_group_block_write8(
        __global uint* p, uint8 data )

void  intel_sub_group_block_write_ui(
        __global uint* p, uint data )
void  intel_sub_group_block_write_ui2(
        __global uint* p, uint2 data )
void  intel_sub_group_block_write_ui4(
        __global uint* p, uint4 data )
void  intel_sub_group_block_write_ui8(
        __global uint* p, uint8 data )</code></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;&#8203;</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">void  intel_sub_group_block_write(
        image2d_t image,
        int2 byte_coord, uint data )
void  intel_sub_group_block_write2(
        image2d_t image,
        int2 byte_coord, uint2 data )
void  intel_sub_group_block_write4(
        image2d_t image,
        int2 byte_coord, uint4 data )
void  intel_sub_group_block_write8(
        image2d_t image,
        int2 byte_coord, uint8 data )

void  intel_sub_group_block_write_ui(
        image2d_t image,
        int2 byte_coord, uint data )
void  intel_sub_group_block_write_ui2(
        image2d_t image,
        int2 byte_coord, uint2 data )
void  intel_sub_group_block_write_ui4(
        image2d_t image,
        int2 byte_coord, uint4 data )
void  intel_sub_group_block_write_ui8(
        image2d_t image,
        int2 byte_coord, uint8 data )</code></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;&#8203;</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</dd>
<dt class="hdlist1">Also, add <code>ulong</code> 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 <code>cl_intel_subgroups</code> extension specification: </dt>
<dd>
<div class="openblock">
<div class="content">
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 55.5555%;">
<col style="width: 44.4445%;">
</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"><div class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">ulong   intel_sub_group_block_read_ul(
          const __global ulong* p )
ulong2  intel_sub_group_block_read_ul2(
          const __global ulong* p )
ulong4  intel_sub_group_block_read_ul4(
          const __global ulong* p )
ulong8  intel_sub_group_block_read_ul8(
          const __global ulong* p )</code></pre>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Reads 1, 2, 4, or 8 ulongs 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"><code>p[ sub_group_local_id ]</code></p>
<p class="tableblock">and the second value read is:</p>
<p class="tableblock"><code>p[ sub_group_local_id + max_sub_group_size ]</code></p>
<p class="tableblock">etc.</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 class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">ulong   intel_sub_group_block_read_ul(
          image2d_t image,
          int2 byte_coord )
ulong2  intel_sub_group_block_read_ul2(
          image2d_t image,
          int2 byte_coord )
ulong4  intel_sub_group_block_read_ul4(
          image2d_t image,
          int2 byte_coord )
ulong8  intel_sub_group_block_read_ul8(
          image2d_t image,
          int2 byte_coord )</code></pre>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Reads 1, 2, 4, or 8 ulongs 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 64-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 class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">void  intel_sub_group_block_write_ul(
        __global ulong* p, ulong data )
void  intel_sub_group_block_write_ul2(
        __global ulong* p, ulong2 data )
void  intel_sub_group_block_write_ul4(
        __global ulong* p, ulong4 data )
void  intel_sub_group_block_write_ul8(
        __global ulong* p, ulong8 data )</code></pre>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Writes 1, 2, 4, 8, or 16 ulongs 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"><code>p[ sub_group_local_id ]</code></p>
<p class="tableblock">and the second value is written to:</p>
<p class="tableblock"><code>p[ sub_group_local_id + max_sub_group_size ]</code></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 class="content"><div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">void  intel_sub_group_block_write_ul(
        image2d_t image,
        int2 byte_coord, ulong data )
void  intel_sub_group_block_write_ul2(
        image2d_t image,
        int2 byte_coord, ulong2 data )
void  intel_sub_group_block_write_ul4(
        image2d_t image,
        int2 byte_coord, ulong4 data )
void  intel_sub_group_block_write_ul8(
        image2d_t image,
        int2 byte_coord, ulong8 data )</code></pre>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Writes 1, 2, 4, or 8 ulongs 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 64-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="_modifications_to_the_opencl_spir_v_environment_specification">Modifications to the OpenCL SPIR-V Environment Specification</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The section numbers below refer to sections added by the <code>cl_intel_spirv_subgroups</code> extension.</p>
</div>
<div class="paragraph">
<p>Note that the restrictions described in Section 7.1.X.3 - <em>Notes and Restrictions</em> in the <code>cl_intel_spirv_subgroups</code> extension are unchanged and continue to apply for this extension.</p>
</div>
<div class="sect2">
<h3 id="_add_to_section_7_1_x_2_block_io_instructions">Add to Section 7.1.X.2 - Block IO Instructions</h3>
<div class="dlist">
<dl>
<dt class="hdlist1">Add to the description of supported types in this section: </dt>
<dd>
<div class="openblock">
<div class="content">
<div class="paragraph">
<p>Additionally, if the OpenCL environment supports the extension <code>cl_intel_subgroups_long</code>:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Scalars and <strong>OpTypeVectors</strong> with 2, 4, or 8 <em>Component Count</em> components of the following <em>Component Type</em> types:</p>
<div class="ulist">
<ul>
<li>
<p><strong>OpTypeInt</strong> with a <em>Width</em> of 64 bits and <em>Signedness</em> of 0 (equivalent to <code>long</code> and <code>ulong</code>)</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</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">
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<col style="width: 4.7619%;">
<col style="width: 14.2857%;">
<col style="width: 14.2857%;">
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<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>
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</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">2020-03-13</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>
</tbody>
</table>
</div>
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