Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 9516ed8a4ffc897ddca5eebfbf7b7218a729c406
https://github.com/WebKit/WebKit/commit/9516ed8a4ffc897ddca5eebfbf7b7218a729c406
Author: Yusuke Suzuki <[email protected]>
Date: 2026-08-18 (Tue, 18 Aug 2026)
Changed paths:
A JSTests/stress/switch-string-substring-rope.js
M Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp
M Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h
M Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp
Log Message:
-----------
[JSC] Apply StringSwitch for substrings
https://bugs.webkit.org/show_bug.cgi?id=322078
rdar://185270122
Reviewed by Yijia Huang.
Like 313752@main, if rope is substring, we can access to the underlying
string data cheaply. This patch extends StringSwitch to substring 8-bit
ropes (previously only non-rope 8-bit string is supported).
Test: JSTests/stress/switch-string-substring-rope.js
* JSTests/stress/switch-string-substring-rope.js: Added.
(shouldBe):
(expectedFor):
(substringOfSubstring):
(check):
* Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::emitSwitchStringOnString):
* Source/JavaScriptCore/dfg/DFGSpeculativeJIT.h:
* Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
Canonical link: https://commits.webkit.org/319433@main
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