Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 90c053c6e5131530d4fc78327183c30e1ddb4f3f
https://github.com/WebKit/WebKit/commit/90c053c6e5131530d4fc78327183c30e1ddb4f3f
Author: Yusuke Suzuki <[email protected]>
Date: 2026-04-29 (Wed, 29 Apr 2026)
Changed paths:
A JSTests/microbenchmarks/array-prototype-lastIndexOf-contiguous-long.js
A JSTests/microbenchmarks/array-prototype-lastIndexOf-int32-long.js
M Source/JavaScriptCore/runtime/ArrayPrototype.cpp
M Source/WTF/wtf/text/StringCommon.h
Log Message:
-----------
[JSC] Optimize Array.prototype.lastIndexOf
https://bugs.webkit.org/show_bug.cgi?id=313672
rdar://175874889
Reviewed by Yijia Huang.
Add reverseFind64 and use it in Array.prototype.lastIndexOf
implementation.
array-prototype-lastIndexOf-contiguous-long 102.3369+-0.1355 ^
96.2670+-3.3248 ^ definitely 1.0631x faster
Tests: JSTests/microbenchmarks/array-prototype-lastIndexOf-contiguous-long.js
JSTests/microbenchmarks/array-prototype-lastIndexOf-int32-long.js
* JSTests/microbenchmarks/array-prototype-lastIndexOf-contiguous-long.js: Added.
(test):
* JSTests/microbenchmarks/array-prototype-lastIndexOf-int32-long.js: Added.
(test):
* Source/JavaScriptCore/runtime/ArrayPrototype.cpp:
(JSC::fastIndexOf):
* Source/WTF/wtf/text/StringCommon.h:
(WTF::reverseFind64):
Canonical link: https://commits.webkit.org/312322@main
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