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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/179621">179621</a></dd>
<dt>Author</dt> <dd>saambarati1@gmail.com</dd>
<dt>Date</dt> <dd>2015-02-04 12:03:52 -0800 (Wed, 04 Feb 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>TypeSet can use 1 byte instead of 4 bytes for its m_seenTypes member variable
https://bugs.webkit.org/show_bug.cgi?id=141204
Reviewed by Darin Adler.
There is no need to use 32 bits to store a TypeSet::RuntimeType set
bit-vector when the largest value for a single TypeSet::RuntimeType
is 0x80. 8 bits is enough to represent the set of seen types.
* dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::fixupNode):
* runtime/TypeSet.cpp:
(JSC::TypeSet::doesTypeConformTo):
* runtime/TypeSet.h:
(JSC::TypeSet::seenTypes):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGFixupPhasecpp">trunk/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeTypeSetcpp">trunk/Source/JavaScriptCore/runtime/TypeSet.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeTypeSeth">trunk/Source/JavaScriptCore/runtime/TypeSet.h</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (179620 => 179621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2015-02-04 19:41:45 UTC (rev 179620)
+++ trunk/Source/JavaScriptCore/ChangeLog 2015-02-04 20:03:52 UTC (rev 179621)
</span><span class="lines">@@ -1,3 +1,21 @@
</span><ins>+2015-02-04 Saam Barati <saambarati1@gmail.com>
+
+ TypeSet can use 1 byte instead of 4 bytes for its m_seenTypes member variable
+ https://bugs.webkit.org/show_bug.cgi?id=141204
+
+ Reviewed by Darin Adler.
+
+ There is no need to use 32 bits to store a TypeSet::RuntimeType set
+ bit-vector when the largest value for a single TypeSet::RuntimeType
+ is 0x80. 8 bits is enough to represent the set of seen types.
+
+ * dfg/DFGFixupPhase.cpp:
+ (JSC::DFG::FixupPhase::fixupNode):
+ * runtime/TypeSet.cpp:
+ (JSC::TypeSet::doesTypeConformTo):
+ * runtime/TypeSet.h:
+ (JSC::TypeSet::seenTypes):
+
</ins><span class="cx"> 2015-02-04 Mark Lam <mark.lam@apple.com>
</span><span class="cx">
</span><span class="cx"> Remove concept of makeUsableFromMultipleThreads().
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGFixupPhasecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp (179620 => 179621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp 2015-02-04 19:41:45 UTC (rev 179620)
+++ trunk/Source/JavaScriptCore/dfg/DFGFixupPhase.cpp 2015-02-04 20:03:52 UTC (rev 179621)
</span><span class="lines">@@ -1143,7 +1143,7 @@
</span><span class="cx"> // (The other direction does not hold in general).
</span><span class="cx">
</span><span class="cx"> RefPtr<TypeSet> typeSet = node->typeLocation()->m_instructionTypeSet;
</span><del>- uint32_t seenTypes = typeSet->seenTypes();
</del><ins>+ uint8_t seenTypes = typeSet->seenTypes();
</ins><span class="cx"> if (typeSet->doesTypeConformTo(TypeMachineInt)) {
</span><span class="cx"> node->convertToCheck();
</span><span class="cx"> if (node->child1()->shouldSpeculateInt32())
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeTypeSetcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/TypeSet.cpp (179620 => 179621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/TypeSet.cpp 2015-02-04 19:41:45 UTC (rev 179620)
+++ trunk/Source/JavaScriptCore/runtime/TypeSet.cpp 2015-02-04 20:03:52 UTC (rev 179621)
</span><span class="lines">@@ -157,7 +157,7 @@
</span><span class="cx"> return seen.toString();
</span><span class="cx"> }
</span><span class="cx">
</span><del>-bool TypeSet::doesTypeConformTo(uint32_t test) const
</del><ins>+bool TypeSet::doesTypeConformTo(uint8_t test) const
</ins><span class="cx"> {
</span><span class="cx"> // This function checks if our seen types conform to the types described by the test bitstring. (i.e we haven't seen more types than test).
</span><span class="cx"> // We are <= to those types if ANDing with the bitstring doesn't zero out any of our bits.
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeTypeSeth"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/TypeSet.h (179620 => 179621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/TypeSet.h 2015-02-04 19:41:45 UTC (rev 179620)
+++ trunk/Source/JavaScriptCore/runtime/TypeSet.h 2015-02-04 20:03:52 UTC (rev 179621)
</span><span class="lines">@@ -48,7 +48,7 @@
</span><span class="cx">
</span><span class="cx"> class JSValue;
</span><span class="cx">
</span><del>-enum RuntimeType {
</del><ins>+enum RuntimeType : uint8_t {
</ins><span class="cx"> TypeNothing = 0x0,
</span><span class="cx"> TypeFunction = 0x1,
</span><span class="cx"> TypeUndefined = 0x2,
</span><span class="lines">@@ -108,12 +108,12 @@
</span><span class="cx"> String leastCommonAncestor() const;
</span><span class="cx"> Ref<Inspector::Protocol::Runtime::TypeSet> inspectorTypeSet() const;
</span><span class="cx"> bool isEmpty() const { return m_seenTypes == TypeNothing; }
</span><del>- bool doesTypeConformTo(uint32_t test) const;
- uint32_t seenTypes() const { return m_seenTypes; }
</del><ins>+ bool doesTypeConformTo(uint8_t test) const;
+ uint8_t seenTypes() const { return m_seenTypes; }
</ins><span class="cx"> StructureSet structureSet() const { return m_structureSet; };
</span><span class="cx">
</span><span class="cx"> private:
</span><del>- uint32_t m_seenTypes;
</del><ins>+ uint8_t m_seenTypes;
</ins><span class="cx"> bool m_isOverflown;
</span><span class="cx"> Vector<RefPtr<StructureShape>> m_structureHistory;
</span><span class="cx"> StructureSet m_structureSet;
</span></span></pre>
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