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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/174091">174091</a></dd>
<dt>Author</dt> <dd>fpizlo@apple.com</dd>
<dt>Date</dt> <dd>2014-09-29 15:38:15 -0700 (Mon, 29 Sep 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>DFG HasStructureProperty codegen should use one fewer registers
https://bugs.webkit.org/show_bug.cgi?id=137235
Reviewed by Andreas Kling.
This was an obvious source of inefficiency and it was causing us to run out of registers on
x86-32.
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGSpeculativeJIT64.cpp:
(JSC::DFG::SpeculativeJIT::compile):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGSpeculativeJIT32_64cpp">trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGSpeculativeJIT64cpp">trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp</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 (174090 => 174091)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2014-09-29 22:25:51 UTC (rev 174090)
+++ trunk/Source/JavaScriptCore/ChangeLog 2014-09-29 22:38:15 UTC (rev 174091)
</span><span class="lines">@@ -1,5 +1,20 @@
</span><span class="cx"> 2014-09-29 Filip Pizlo <fpizlo@apple.com>
</span><span class="cx">
</span><ins>+ DFG HasStructureProperty codegen should use one fewer registers
+ https://bugs.webkit.org/show_bug.cgi?id=137235
+
+ Reviewed by Andreas Kling.
+
+ This was an obvious source of inefficiency and it was causing us to run out of registers on
+ x86-32.
+
+ * dfg/DFGSpeculativeJIT32_64.cpp:
+ (JSC::DFG::SpeculativeJIT::compile):
+ * dfg/DFGSpeculativeJIT64.cpp:
+ (JSC::DFG::SpeculativeJIT::compile):
+
+2014-09-29 Filip Pizlo <fpizlo@apple.com>
+
</ins><span class="cx"> Don't use GPRResult unless you're flushing registers and making a runtime function call
</span><span class="cx"> https://bugs.webkit.org/show_bug.cgi?id=137234
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGSpeculativeJIT32_64cpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp (174090 => 174091)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp 2014-09-29 22:25:51 UTC (rev 174090)
+++ trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT32_64.cpp 2014-09-29 22:38:15 UTC (rev 174091)
</span><span class="lines">@@ -4624,20 +4624,18 @@
</span><span class="cx"> JSValueOperand base(this, node->child1());
</span><span class="cx"> SpeculateCellOperand property(this, node->child2());
</span><span class="cx"> SpeculateCellOperand enumerator(this, node->child3());
</span><del>- GPRTemporary scratch(this);
</del><span class="cx"> GPRTemporary resultPayload(this);
</span><span class="cx"> GPRTemporary resultTag(this);
</span><span class="cx">
</span><span class="cx"> GPRReg baseTagGPR = base.tagGPR();
</span><span class="cx"> GPRReg basePayloadGPR = base.payloadGPR();
</span><span class="cx"> GPRReg propertyGPR = property.gpr();
</span><del>- GPRReg scratchGPR = scratch.gpr();
</del><span class="cx"> GPRReg resultPayloadGPR = resultPayload.gpr();
</span><span class="cx"> GPRReg resultTagGPR = resultTag.gpr();
</span><span class="cx">
</span><del>- m_jit.load32(MacroAssembler::Address(basePayloadGPR, JSCell::structureIDOffset()), scratchGPR);
</del><ins>+ m_jit.load32(MacroAssembler::Address(basePayloadGPR, JSCell::structureIDOffset()), resultTagGPR);
</ins><span class="cx"> MacroAssembler::Jump wrongStructure = m_jit.branch32(MacroAssembler::NotEqual,
</span><del>- scratchGPR,
</del><ins>+ resultTagGPR,
</ins><span class="cx"> MacroAssembler::Address(enumerator.gpr(), JSPropertyNameEnumerator::cachedStructureIDOffset()));
</span><span class="cx">
</span><span class="cx"> moveTrueTo(resultPayloadGPR);
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGSpeculativeJIT64cpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp (174090 => 174091)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp 2014-09-29 22:25:51 UTC (rev 174090)
+++ trunk/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp 2014-09-29 22:38:15 UTC (rev 174091)
</span><span class="lines">@@ -4691,17 +4691,15 @@
</span><span class="cx"> JSValueOperand base(this, node->child1());
</span><span class="cx"> SpeculateCellOperand property(this, node->child2());
</span><span class="cx"> SpeculateCellOperand enumerator(this, node->child3());
</span><del>- GPRTemporary scratch(this);
</del><span class="cx"> GPRTemporary result(this);
</span><span class="cx">
</span><span class="cx"> GPRReg baseGPR = base.gpr();
</span><span class="cx"> GPRReg propertyGPR = property.gpr();
</span><del>- GPRReg scratchGPR = scratch.gpr();
</del><span class="cx"> GPRReg resultGPR = result.gpr();
</span><span class="cx">
</span><del>- m_jit.load32(MacroAssembler::Address(baseGPR, JSCell::structureIDOffset()), scratchGPR);
</del><ins>+ m_jit.load32(MacroAssembler::Address(baseGPR, JSCell::structureIDOffset()), resultGPR);
</ins><span class="cx"> MacroAssembler::Jump wrongStructure = m_jit.branch32(MacroAssembler::NotEqual,
</span><del>- scratchGPR,
</del><ins>+ resultGPR,
</ins><span class="cx"> MacroAssembler::Address(enumerator.gpr(), JSPropertyNameEnumerator::cachedStructureIDOffset()));
</span><span class="cx">
</span><span class="cx"> moveTrueTo(resultGPR);
</span></span></pre>
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