Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 7a5475349dfc7d55a28b84ec9774963ed5210427
https://github.com/WebKit/WebKit/commit/7a5475349dfc7d55a28b84ec9774963ed5210427
Author: Yusuke Suzuki <ysuz...@apple.com>
Date: 2025-03-07 (Fri, 07 Mar 2025)
Changed paths:
M Source/JavaScriptCore/runtime/ArrayPrototype.cpp
M Source/JavaScriptCore/runtime/JSArray.cpp
Log Message:
-----------
[JSC] Use CoW immutable butterfly when we do not need to modify for concat /
clone
https://bugs.webkit.org/show_bug.cgi?id=289393
rdar://146527451
Reviewed by Yijia Huang.
When we found,
1. CoW.concat()
2. CoW.concat([]) or [].concat(CoW)
Then we do not need to clone entire butterfly. We can take immutable
butterfly from the input and wrap it with a new array.
* Source/JavaScriptCore/runtime/ArrayPrototype.cpp:
(JSC::concatAppendArray):
* Source/JavaScriptCore/runtime/JSArray.cpp:
(JSC::tryCloneArrayFromFast):
Canonical link: https://commits.webkit.org/291829@main
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