Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 06b27b91cf2cb5e6e4fc78f5410c065d75de1633
https://github.com/WebKit/WebKit/commit/06b27b91cf2cb5e6e4fc78f5410c065d75de1633
Author: Yusuke Suzuki <[email protected]>
Date: 2024-08-07 (Wed, 07 Aug 2024)
Changed paths:
A JSTests/microbenchmarks/construct-object.js
M Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h
M Source/JavaScriptCore/dfg/DFGConstantFoldingPhase.cpp
M Source/JavaScriptCore/dfg/DFGNode.h
Log Message:
-----------
[JSC] Fold super call with explicitly specified `Object` constructor
https://bugs.webkit.org/show_bug.cgi?id=277787
rdar://133426751
Reviewed by Keith Miller.
We do slow path when we explicitly specifying `Object` for the super class. We
found these patterns in some cases, so we would like to optimize it.
In DFG AI, we attempt to figure out that
1. super class is `Object`
2. new.target is something constant JSFunction
Then we do folding into NewObject by using internalFunctionAllocationProfile.
ToT Patched
construct-object 10.3615+-0.0283 ^ 2.9730+-0.0200 ^
definitely 3.4852x faster
* JSTests/microbenchmarks/construct-object.js: Added.
(A):
(B):
(test):
* Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h:
(JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
* Source/JavaScriptCore/dfg/DFGConstantFoldingPhase.cpp:
(JSC::DFG::ConstantFoldingPhase::foldConstants):
* Source/JavaScriptCore/dfg/DFGNode.h:
(JSC::DFG::Node::convertToNewObject):
Canonical link: https://commits.webkit.org/281981@main
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