Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 7aea7dd35f02e4dea28a15e47ee9ff486da0aeda
https://github.com/WebKit/WebKit/commit/7aea7dd35f02e4dea28a15e47ee9ff486da0aeda
Author: Yusuke Suzuki <[email protected]>
Date: 2026-04-07 (Tue, 07 Apr 2026)
Changed paths:
A JSTests/stress/constant-string-length-folding.js
M Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp
M Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h
M Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
M Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp
Log Message:
-----------
[JSC] Fold string length as much as possible in DFG / FTL
https://bugs.webkit.org/show_bug.cgi?id=311666
rdar://174257984
Reviewed by Keith Miller and Yijia Huang.
Add helper function to fold string length as much as possible in DFG and
FTL. This potentially skips unnecessary loading or removing dead code.
Test: JSTests/stress/constant-string-length-folding.js
* JSTests/stress/constant-string-length-folding.js: Added.
(shouldBe):
(testLength):
(testCharCodeAt):
(testCodePointAt):
(testSlice):
(testAt):
(testToUpperCase):
(testToLowerCase):
* Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileStringCodePointAt):
(JSC::DFG::SpeculativeJIT::compileGetCharCodeAt):
(JSC::DFG::SpeculativeJIT::compileGetByValOnString):
* Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h:
* Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp:
(JSC::DFG::StrengthReductionPhase::handleNode):
* Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileGetArrayLength):
(JSC::FTL::DFG::LowerDFGToB3::compileStringCharAtImpl):
(JSC::FTL::DFG::LowerDFGToB3::compileStringCharCodeAt):
(JSC::FTL::DFG::LowerDFGToB3::compileStringCodePointAt):
(JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
Canonical link: https://commits.webkit.org/310753@main
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