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<body class="article">
<div id="header">
<h1>cl_intel_spirv_media_block_io</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_spirv_media_block_io</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>
Biju George, Intel<br>
Pawel Jurek, 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: 2018-10-29<br>
Revision: 1</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_dependencies">Dependencies</h2>
<div class="sectionbody">
<div class="paragraph"><p>This extension is written against the OpenCL SPIR-V Environment Specification Version 2.2, Revision v2.2-3.</p></div>
<div class="paragraph"><p>This extension requires OpenCL support for SPIR-V, either via OpenCL 2.1 or via the <span class="monospaced">cl_khr_il_program</span> extension, and support for the <span class="monospaced">cl_intel_media_block_io</span> extension.</p></div>
<div class="paragraph"><p>This extension interacts with the <span class="monospaced">cl_intel_packed_yuv</span> extension.</p></div>
<div class="paragraph"><p>This extension interacts with the <span class="monospaced">cl_intel_planar_yuv</span> extension.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph"><p>This extension defines how modules using the SPIR-V extension <span class="monospaced">SPV_INTEL_media_block_io</span> may behave in an OpenCL environment.</p></div>
<div class="paragraph"><p>This extension is a companion to the <span class="monospaced">cl_intel_media_block_io</span> OpenCL extension, and the functionality described in this extension and <span class="monospaced">SPV_INTEL_media_block_io</span> is sufficient to implement the built-in functions defined in the <span class="monospaced">cl_intel_media_block_io</span> extension.</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="_modifications_to_the_opencl_spir_v_environment_specification">Modifications to the OpenCL SPIR-V Environment Specification</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_add_a_new_section_7_1_x_span_class_monospaced_cl_intel_spirv_media_block_io_span">Add a new Section 7.1.X - <span class="monospaced">cl_intel_spirv_media_block_io</span></h3>
<div class="paragraph"><p>If the OpenCL environment supports the extension <span class="monospaced">cl_intel_spirv_media_block_io</span>, then the environment must accept SPIR-V modules that declare use of the <span class="monospaced">SPV_INTEL_media_block_io</span> extension via <strong>OpExtension</strong>.</p></div>
<div class="paragraph"><p>If the OpenCL environment supports the extension <span class="monospaced">cl_intel_spirv_media_block_io</span> and use of the <span class="monospaced">SPV_INTEL_media_block_io</span> extension is declared in the module via <strong>OpExtension</strong>, then the environment must accept modules that declare the following SPIR-V capabilities:</p></div>
<div class="ulist"><ul>
<li>
<p>
<strong>SubgroupImageMediaBlockIOINTEL</strong>
</p>
</li>
</ul></div>
<div class="paragraph"><p>Additionally, the environment must accept the following types for <em>Result Type</em> for <strong>OpSubgroupImageMediaBlockReadINTEL</strong>, and for the type of <em>Data</em> for <strong>OpSubgroupImageMediaBlockWriteINTEL</strong>:</p></div>
<div class="ulist"><ul>
<li>
<p>
Scalars and <strong>OpTypeVectors</strong> with 2, 4, 8, or 16 <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 8 bits and <em>Signedness</em> of 0 (equivalent to <span class="monospaced">char</span> and <span class="monospaced">uchar</span>)
</p>
</li>
<li>
<p>
<strong>OpTypeInt</strong> with a <em>Width</em> of 16 bits and <em>Signedness</em> of 0 (equivalent to <span class="monospaced">short</span> and <span class="monospaced">ushort</span>)
</p>
</li>
<li>
<p>
<strong>OpTypeInt</strong> with a <em>Width</em> of 32 bits and <em>Signedness</em> of 0 (equivalent to <span class="monospaced">int</span> and <span class="monospaced">uint</span>)
</p>
</li>
</ul></div>
</li>
</ul></div>
<div class="paragraph"><p>For <em>Image</em>:</p></div>
<div class="ulist"><ul>
<li>
<p>
<em>Dim</em> must be <strong>2D</strong>
</p>
</li>
<li>
<p>
<em>Depth</em> must be 0 (not a depth image)
</p>
</li>
<li>
<p>
<em>Arrayed</em> must be 0 (non-arrayed content)
</p>
</li>
<li>
<p>
<em>MS</em> must be 0 (single-sampled content)
</p>
</li>
<li>
<p>
(equivalent to <span class="monospaced">image2d_t</span>)
</p>
</li>
</ul></div>
<div class="paragraph"><p>For <em>Coordinate</em>, the following types are supported:</p></div>
<div class="ulist"><ul>
<li>
<p>
<strong>OpTypeVectors</strong> with 2 <em>Component Count</em> components of <em>Component Type</em> <strong>OpTypeInt</strong> with a <em>Width</em> of 32 bits and <em>Signedness</em> of 0 (equivalent to <span class="monospaced">int2</span>)
</p>
</li>
</ul></div>
<div class="paragraph"><p>For <em>Width</em> and <em>Height</em>, the following type is supported:</p></div>
<div class="ulist"><ul>
<li>
<p>
Scalars of <strong>OpTypeInt</strong> with a <em>Width</em> of 32 bits and a <em>Signedness</em> of 0 (equivalent to <span class="monospaced">int</span>)
</p>
</li>
</ul></div>
</div>
<div class="sect2">
<h3 id="_add_a_new_section_7_1_x_1_notes_and_restrictions">Add a new Section 7.1.X.1 - Notes and Restrictions</h3>
<div class="paragraph"><p>Both <strong>OpSubgroupImageMediaBlockReadINTEL</strong> and <strong>OpSubgroupImageMediaBlockWriteINTEL</strong> must be encountered by all work items in the subgroup executing the kernel, otherwise the behavior is undefined (i.e. they can only be used in convergent control flow where all the work items in the subgroup are enabled).</p></div>
<div class="paragraph"><p>The block <em>Width</em> determines the maximum <em>Height</em> for <strong>OpSubgroupImageMediaBlockReadINTEL</strong> and <strong>OpSubgroupImageMediaBlockWriteINTEL</strong>, and is summarized in the following table:</p></div>
<table class="tableblock frame-all grid-all"
style="
width:100%;
">
<col style="width:50%;">
<col style="width:50%;">
<thead>
<tr>
<th class="tableblock halign-left valign-top" ><strong>Width (bytes)</strong></th>
<th class="tableblock halign-left valign-top" ><strong>Maximum Height (rows)</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top" ><p class="tableblock">4</p></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">64</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><p class="tableblock">8</p></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">32</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><p class="tableblock">12, 16</p></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">16</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><p class="tableblock">20, 24, 28, 32</p></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">8</p></td>
</tr>
</tbody>
</table>
<div class="paragraph"><p>Both the first component of <em>Component</em>, which represents the byte offset into the <em>Image</em>, and the block <em>Width</em> must be four byte aligned.</p></div>
<div class="paragraph"><p>Both the block <em>Width</em> and <em>Height</em> must be compile time constants.</p></div>
<div class="paragraph"><p>The <em>Image</em> operand must only be used by other <strong>SubgroupImageMediaBlockIOINTEL</strong> instructions or image query instructions.  They may not be used by any other instructions that read texels from or write texels to the <em>Image</em>.</p></div>
<div class="paragraph"><p>Behavior is undefined if <em>Image</em> is a planar YUV image, however <em>Image</em> may represent an individual plane of a planar YUV image.</p></div>
<div class="paragraph"><p>The <em>Image</em> operand must be created such that the image byte width, defined as the image width multiplied by the <em>Image Format</em> size, is a multiple of four bytes.</p></div>
<div class="paragraph"><p>For <strong>OpSubgroupImageMediaBlockReadINTEL</strong>, if the <em>Image Format</em> size is smaller than the block read <em>Component Type</em>, then an out-of-bounds read will return data replicated from the nearest edge element, otherwise out-of-bound read behavior is undefined.  For example:</p></div>
<div class="ulist"><ul>
<li>
<p>
For an image with <em>Image Format</em> size equal to a single byte (for example <strong>R8</strong>), and a 32-bit boundary value <span class="monospaced">B0B1B2B3</span>, replicating off the left edge may result in the 32-bit value <span class="monospaced">B0B0B0B0</span>, and replicating off the right edge may result in the 32-bit value <span class="monospaced">B3B3B3B3</span>.
</p>
</li>
<li>
<p>
For an image with an <em>Image Format</em> size equal to two bytes (for example <strong>R16</strong>), replicating off the left edge may result in the 32-bit value <span class="monospaced">B0B1B0B1</span>, and replicating off the right edge may result in the 32-bit value <span class="monospaced">B2B3B2B3</span>.
</p>
</li>
<li>
<p>
For an image with an <em>Image Format</em> size equal to four bytes (for example <strong>Rgba8</strong>), the entire boundary value is replicated, for both the left or right edges.
</p>
</li>
<li>
<p>
Because the maximum <em>Component Type</em> is a four byte component type, there is no defined out-of-bounds behavior for images with an <em>Image Format</em> size greater than four bytes.
</p>
</li>
<li>
<p>
As a special case, an image with a packed YUV <em>Image Format</em> (and hence an <em>Image Format</em> size equal to two bytes) behaves as follows:
</p>
<div class="ulist"><ul>
<li>
<p>
Replicating off of the left edge replicates the UV components and the first Y component, so, for example, replicating the 32-bit boundary value <span class="monospaced">Y0U0Y1V0</span> will result in the 32-bit value <span class="monospaced">Y0U0Y0V0</span>.
</p>
</li>
<li>
<p>
Replicating off the right edge replicates the UV components and the second Y component, so, for example, replicating the 32-bit boundary value <span class="monospaced">Y0U0Y1V0</span> will result in the 32-bit value <span class="monospaced">Y1U0Y1V0</span>.
</p>
</li>
</ul></div>
</li>
</ul></div>
<div class="paragraph"><p>For <strong>OpSubgroupImageMediaBlockWriteINTEL</strong>, if the <em>Image Format</em> size is smaller than the block write <em>Component Type</em>, then out-of-bounds writes will be dropped, otherwise out-of-bounds write behavior is undefined.</p></div>
<div class="paragraph"><p>When reading or writing a 2D <em>Image</em> created from a buffer:</p></div>
<div class="ulist"><ul>
<li>
<p>
The <em>image row pitch</em> is required to be a multiple of 64-bytes, in addition to the <span class="monospaced">CL_DEVICE_IMAGE_PITCH_ALIGNMENT</span> requirements.
</p>
</li>
<li>
<p>
If the buffer is a <span class="monospaced">cl_mem</span> that was created with <span class="monospaced">CL_MEM_USE_HOST_PTR</span>, then the <em>host_ptr</em> must be 256-bit (32-byte) aligned.
</p>
</li>
<li>
<p>
If the buffer is a <span class="monospaced">cl_mem</span> that is a sub-buffer, then the <em>origin</em> must be a multiple of 32-bytes.  Additionally, if the <em>buffer</em> that the sub-buffer is created from was created with <span class="monospaced">CL_MEM_USE_HOST_PTR</span>, then the <em>host_ptr</em> for the <em>buffer</em> must be 256-bit (32-byte) aligned.
</p>
</li>
<li>
<p>
The maximum <em>Height</em> is further restricted to 16 rows or less.
</p>
</li>
</ul></div>
<div class="paragraph"><p>Behavior is undefined if the size of the 2D source region (defined by the type of <em>Data</em> and <strong>SubgroupMaxSize</strong>) is smaller than the size of the 2D region to write (defined by <em>Width</em>, <em>Height</em>, and block write <em>Component Type</em>).</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_issues">Issues</h2>
<div class="sectionbody">
<div class="paragraph"><p>None.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_revision_history">Revision History</h2>
<div class="sectionbody">
<table class="tableblock frame-all grid-rows"
style="
width:100%;
">
<col style="width:4%;">
<col style="width:14%;">
<col style="width:14%;">
<col style="width:66%;">
<thead>
<tr>
<th class="tableblock halign-left valign-top" >Rev</th>
<th class="tableblock halign-left valign-top" >Date</th>
<th class="tableblock halign-left valign-top" >Author</th>
<th class="tableblock halign-left valign-top" >Changes</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top" ><p class="tableblock">1</p></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">2018-10-29</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>Initial revision</strong></p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div id="footnotes"><hr></div>
<div id="footer">
<div id="footer-text">
Last updated
 2018-10-29 11:47:08 PDT
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