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SPV_KHR_physical_storage_buffer.html
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SPV_KHR_physical_storage_buffer.html
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<!DOCTYPE html>
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<head>
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<title>SPV_KHR_physical_storage_buffer</title>
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<body class="article">
<div id="header">
<h1>SPV_KHR_physical_storage_buffer</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>SPV_KHR_physical_storage_buffer</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_contact">Contact</h2>
<div class="sectionbody">
<div class="paragraph"><p>To report problems with this extension, please open a new issue at:</p></div>
<div class="paragraph"><p><a href="https://github.com/KhronosGroup/SPIRV-Registry">https://github.com/KhronosGroup/SPIRV-Registry</a></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_contributors">Contributors</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Jeff Bolz, NVIDIA
</p>
</li>
<li>
<p>
Neil Henning, AMD
</p>
</li>
<li>
<p>
Tobias Hector, AMD
</p>
</li>
<li>
<p>
Faith Ekstrand, Intel
</p>
</li>
<li>
<p>
Mariusz Merecki, Intel
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_notice">Notice</h2>
<div class="sectionbody">
<div class="paragraph"><p>Copyright (c) 2018 The Khronos Group Inc. Copyright terms at
<a href="http://www.khronos.org/registry/speccopyright.html">http://www.khronos.org/registry/speccopyright.html</a></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_status">Status</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Complete
</p>
</li>
<li>
<p>
Ratified by the Khronos Board 2019-08-23.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_version">Version</h2>
<div class="sectionbody">
<table class="tableblock frame-all grid-all"
style="
width:40%;
">
<col style="width:50%;">
<col style="width:50%;">
<tbody>
<tr>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Last Modified Date</p></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">2019-09-20</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" ><p class="tableblock">Revision</p></td>
<td class="tableblock halign-left valign-top" ><p class="tableblock">2</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="_dependencies">Dependencies</h2>
<div class="sectionbody">
<div class="paragraph"><p>This extension is written against the SPIR-V Specification,
Version 1.3, Revision 5, Unified.</p></div>
<div class="paragraph"><p>This extension requires SPIR-V 1.3.</p></div>
<div class="paragraph"><p>The result of <strong>OpConstantNull</strong> must not be a pointer into the
<strong>PhysicalStorageBufferEXT</strong> storage class.</p></div>
<div class="paragraph"><p>When used with SPIR-V 1.4 or higher, operands to <strong>OpPtrEqual</strong>, <strong>OpPtrNotEqual</strong>,
and <strong>OpPtrDiff</strong> must not be pointers into the <strong>PhysicalStorageBufferEXT</strong> storage
class.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph"><p>This extension adds a new storage class <strong>PhysicalStorageBuffer</strong> which is
similar to <strong>StorageBuffer</strong> except pointers to the <strong>PhysicalStorageBuffer</strong>
storage class are treated as physical pointer types according to a new
addressing model <strong>PhysicalStorageBuffer64</strong>. This addressing model is a
hybrid of logical and physical addressing, with only pointers to
<strong>PhysicalStorageBuffer</strong> storage class being physical, and using 64-bit
addresses. It also adds a new capablity <strong>PhysicalStorageBufferAddresses</strong>
and enables a few instructions currently supported for <strong>Addresses</strong>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_extension_name">Extension Name</h2>
<div class="sectionbody">
<div class="paragraph"><p>To use this extension within a SPIR-V module, the following
<strong>OpExtension</strong> must be present in the module:</p></div>
<div class="listingblock">
<div class="content monospaced">
<pre>OpExtension "SPV_KHR_physical_storage_buffer"</pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_modifications_to_the_spir_v_specification_version_1_3">Modifications to the SPIR-V Specification, Version 1.3</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_2_2_terms">2.2 Terms</h3>
<div class="paragraph"><p>Add new terms to section 2.2.2 Types:</p></div>
<div class="paragraph"><p><a id="PhysicalPointerType"></a><em>Physical Pointer Type:</em> A pointer type is a physical
pointer type if the <a href="#Storage_Class">storage class</a> of the type pointed to uses physical
addressing according to the <a href="#Addressing_Model">addressing model</a>.</p></div>
<div class="paragraph"><p><a id="LogicalPointerType"></a><em>Logical Pointer Type:</em> A pointer type is a logical
pointer type if it is not a physical pointer type.</p></div>
<div class="paragraph"><p>Modify the following definitions:</p></div>
<div class="paragraph"><p><a id="ConcreteType"></a><em>Concrete Type:</em> A numerical scalar, vector, matrix type,
or physical pointer type, or any aggregate containing only these types.</p></div>
<div class="paragraph"><p><a id="AbstractType"></a><em>Abstract Type:</em> An <strong>OpTypeVoid</strong> or <strong>OpTypeBool</strong>, or logical
pointer type, or any aggregate type containing any of these.</p></div>
<div class="paragraph"><p>Modify the definition of <em>Memory Object Declaration</em>:</p></div>
<div class="paragraph"><p><a id="MemoryObjectDeclaration"></a><em>Memory Object Declaration:</em> An <strong>OpVariable</strong>, or
an <strong>OpFunctionParameter</strong> of pointer type, or the contents of an <strong>OpVariable</strong>
that holds a pointer to <strong>PhysicalStorageBuffer</strong> <a href="#Storage_Class">storage class</a>
or holds an array of such pointers.</p></div>
<div class="paragraph"><p>Modify the first part of the definition of <em>Variable pointer</em> from:</p></div>
<div class="paragraph"><p><a id="VariablePointer"></a><em>Variable pointer:</em> A pointer that results from one of the
following instructions: …</p></div>
<div class="paragraph"><p>to:</p></div>
<div class="paragraph"><p><a id="VariablePointer"></a><em>Variable pointer:</em> A pointer of logical pointer type that
results from one of the following instructions: …</p></div>
</div>
<div class="sect2">
<h3 id="_2_16_validation_rules">2.16 Validation Rules</h3>
<div class="paragraph"><p>Modify section 2.16.1. Universal Validation Rules:</p></div>
<div class="paragraph"><p>Change:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>"If the *Logical* <<Addressing_Model, addressing model>> is selected and the
*VariablePointers* <<Capability,capability>> is not declared:"</pre>
</div></div>
<div class="paragraph"><p>to:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>"If the *VariablePointers* <<Capability,capability>> is not declared, the
following rules apply to <<LogicalPointerType,logical pointer types>>:".</pre>
</div></div>
<div class="paragraph"><p>Change:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>*OpVariable* cannot allocate an object whose type is a pointer type (that
is, it cannot create an object in memory that is itself a pointer and
whose result would thus be a pointer to a pointer)</pre>
</div></div>
<div class="paragraph"><p>to:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>*OpVariable* cannot allocate an object whose type is a
<<LogicalPointerType,logical pointer type>> (that is, it cannot create an
object in memory that is itself a logical pointer and whose result would
thus be a pointer to a logical pointer)</pre>
</div></div>
<div class="paragraph"><p>Change:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>"If the *Logical *<<Addressing_Model, addressing model>> is selected and the
*VariablePointers* or *VariablePointersStorageBuffer* <<Capability,capability>> is
declared (in addition to what is allowed above by the *Logical* addressing model):"</pre>
</div></div>
<div class="paragraph"><p>to:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>"If the *VariablePointers* or *VariablePointersStorageBuffer* <<Capability,capability>>
is declared, the following are allowed for <<LogicalPointerType,logical pointer types>>:".</pre>
</div></div>
<div class="paragraph"><p>Change:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>*OpVariable* can allocate an object whose type is a pointer type, if the
<<Storage_Class, Storage Class>> of the *OpVariable* is one of the
following: ...</pre>
</div></div>
<div class="paragraph"><p>to:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>*OpVariable* can allocate an object whose type is a
<<LogicalPointerType,logical pointer type>>, if the
<<Storage_Class, Storage Class>> of the *OpVariable* is one of the
following: ...</pre>
</div></div>
<div class="paragraph"><p>Change:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>A <<VariablePointer,variable pointer>> with the Logical addressing model cannot ...</pre>
</div></div>
<div class="paragraph"><p>to:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>A <<VariablePointer,variable pointer>> cannot ...</pre>
</div></div>
<div class="paragraph"><p>Add the following rules:</p></div>