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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/198013">198013</a></dd>
<dt>Author</dt> <dd>carlosgc@webkit.org</dd>
<dt>Date</dt> <dd>2016-03-11 06:14:11 -0800 (Fri, 11 Mar 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/197685">r197685</a> - [JSC] Remove a useless "Move" from baseline-JIT op_mul's fast path
https://bugs.webkit.org/show_bug.cgi?id=155071
Reviewed by Geoffrey Garen.
We do not need to multiply to a scratch and then move the result
to the destination. We can just multiply to the destination.
* jit/JITArithmetic.cpp:
(JSC::JIT::emit_op_mul):
* jit/JITMulGenerator.cpp:
(JSC::JITMulGenerator::generateFastPath):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#releasesWebKitGTKwebkit212SourceJavaScriptCoreChangeLog">releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit212SourceJavaScriptCorejitJITArithmeticcpp">releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITArithmetic.cpp</a></li>
<li><a href="#releasesWebKitGTKwebkit212SourceJavaScriptCorejitJITMulGeneratorcpp">releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITMulGenerator.cpp</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="releasesWebKitGTKwebkit212SourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/ChangeLog (198012 => 198013)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/ChangeLog 2016-03-11 14:05:55 UTC (rev 198012)
+++ releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/ChangeLog 2016-03-11 14:14:11 UTC (rev 198013)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2016-03-07 Benjamin Poulain <benjamin@webkit.org>
+
+ [JSC] Remove a useless "Move" from baseline-JIT op_mul's fast path
+ https://bugs.webkit.org/show_bug.cgi?id=155071
+
+ Reviewed by Geoffrey Garen.
+
+ We do not need to multiply to a scratch and then move the result
+ to the destination. We can just multiply to the destination.
+
+ * jit/JITArithmetic.cpp:
+ (JSC::JIT::emit_op_mul):
+ * jit/JITMulGenerator.cpp:
+ (JSC::JITMulGenerator::generateFastPath):
+
</ins><span class="cx"> 2016-03-06 Benjamin Poulain <benjamin@webkit.org>
</span><span class="cx">
</span><span class="cx"> [JSC] Improve DFG's Int32 ArithMul if one operand is a constant
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit212SourceJavaScriptCorejitJITArithmeticcpp"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITArithmetic.cpp (198012 => 198013)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITArithmetic.cpp 2016-03-11 14:05:55 UTC (rev 198012)
+++ releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITArithmetic.cpp 2016-03-11 14:14:11 UTC (rev 198013)
</span><span class="lines">@@ -822,8 +822,8 @@
</span><span class="cx"> #if USE(JSVALUE64)
</span><span class="cx"> JSValueRegs leftRegs = JSValueRegs(regT0);
</span><span class="cx"> JSValueRegs rightRegs = JSValueRegs(regT1);
</span><del>- JSValueRegs resultRegs = leftRegs;
- GPRReg scratchGPR = regT2;
</del><ins>+ JSValueRegs resultRegs = JSValueRegs(regT2);
+ GPRReg scratchGPR = regT3;
</ins><span class="cx"> FPRReg scratchFPR = InvalidFPRReg;
</span><span class="cx"> #else
</span><span class="cx"> JSValueRegs leftRegs = JSValueRegs(regT1, regT0);
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit212SourceJavaScriptCorejitJITMulGeneratorcpp"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITMulGenerator.cpp (198012 => 198013)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITMulGenerator.cpp 2016-03-11 14:05:55 UTC (rev 198012)
+++ releases/WebKitGTK/webkit-2.12/Source/JavaScriptCore/jit/JITMulGenerator.cpp 2016-03-11 14:14:11 UTC (rev 198013)
</span><span class="lines">@@ -60,9 +60,13 @@
</span><span class="cx"> // Try to do intVar * intConstant.
</span><span class="cx"> CCallHelpers::Jump notInt32 = jit.branchIfNotInt32(var);
</span><span class="cx">
</span><del>- m_slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constOpr.asConstInt32()), m_scratchGPR));
</del><ins>+ GPRReg multiplyResultGPR = m_result.payloadGPR();
+ if (multiplyResultGPR == var.payloadGPR())
+ multiplyResultGPR = m_scratchGPR;
</ins><span class="cx">
</span><del>- jit.boxInt32(m_scratchGPR, m_result);
</del><ins>+ m_slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constOpr.asConstInt32()), multiplyResultGPR));
+
+ jit.boxInt32(multiplyResultGPR, m_result);
</ins><span class="cx"> m_endJumpList.append(jit.jump());
</span><span class="cx">
</span><span class="cx"> if (!jit.supportsFloatingPoint()) {
</span></span></pre>
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