Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: fdb282b50fa810129e6d14c95010a1d30e246fe9
https://github.com/WebKit/WebKit/commit/fdb282b50fa810129e6d14c95010a1d30e246fe9
Author: Sosuke Suzuki <[email protected]>
Date: 2026-01-16 (Fri, 16 Jan 2026)
Changed paths:
A JSTests/microbenchmarks/scoped-arguments-slice-double.js
A JSTests/microbenchmarks/scoped-arguments-slice-int32.js
A JSTests/microbenchmarks/scoped-arguments-slice.js
A JSTests/stress/slice-scoped-arguments.js
M Source/JavaScriptCore/runtime/JSArray.cpp
M Source/JavaScriptCore/runtime/ScopedArguments.cpp
M Source/JavaScriptCore/runtime/ScopedArguments.h
Log Message:
-----------
[JSC] Add fast path for Array.prototype.slice on ScopedArguments
https://bugs.webkit.org/show_bug.cgi?id=304838
Reviewed by Yusuke Suzuki.
This change adds a fast path for Array.prototype.slice when called on
ScopedArguments objects, similar to the existing optimization for
DirectArguments.
TipOfTree Patched
scoped-arguments-slice 155.2137+-1.8613 ^ 63.0061+-1.4876
^ definitely 2.4635x faster
scoped-arguments-slice-int32 155.8805+-5.8409 ^ 60.1825+-1.5710
^ definitely 2.5901x faster
scoped-arguments-slice-double 156.4347+-4.6210 ^ 68.9260+-1.2236
^ definitely 2.2696x faster
* JSTests/microbenchmarks/scoped-arguments-slice-double.js: Added.
* JSTests/microbenchmarks/scoped-arguments-slice-int32.js: Added.
* JSTests/microbenchmarks/scoped-arguments-slice.js: Added.
* JSTests/stress/slice-scoped-arguments.js: Added.
* Source/JavaScriptCore/runtime/JSArray.cpp:
(JSC::JSArray::fastSlice): Add ScopedArgumentsType case.
* Source/JavaScriptCore/runtime/ScopedArguments.cpp:
(JSC::ScopedArguments::fastSlice): Added.
* Source/JavaScriptCore/runtime/ScopedArguments.h:
Canonical link: https://commits.webkit.org/305704@main
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