Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 14ddbfed34e8e1c6a26549f722dd690119bb1266
https://github.com/WebKit/WebKit/commit/14ddbfed34e8e1c6a26549f722dd690119bb1266
Author: Sosuke Suzuki <[email protected]>
Date: 2025-06-11 (Wed, 11 Jun 2025)
Changed paths:
A JSTests/microbenchmarks/array-prototype-concat-empty.js
M Source/JavaScriptCore/runtime/JSArray.cpp
Log Message:
-----------
[JSC] Skip index-type update in `tryCloneArrayFromFast` when `fillMode` is
`Empty`
https://bugs.webkit.org/show_bug.cgi?id=294247
Reviewed by Yusuke Suzuki.
`tryCloneArrayFromFast` adjusts the result’s index type
if the source array contains holes, on the assumption
that the holes will be filled with `undefined`.
This adjustment is valid only when `fillMode` is `Undefined`,
but the current implementation also performs it when
`fillMode` is `Empty`.
This patch changes to prevents the index-type update when
`fillMode` is `Empty`.
TipOfTree Patched
array-prototype-concat-empty 7.7375+-0.1340 ^
5.3688+-0.1247 ^ definitely 1.4412x faster
Canonical link: https://commits.webkit.org/296082@main
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