[webkit-changes] [WebKit/WebKit] db79b7: [JSC] Implement `Array.prototype.copyWithin` in C++

[SUZUKI Sosuke]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: db79b71cfdc4b1d72a3c3665dee777fe7ba7249d
      
https://github.com/WebKit/WebKit/commit/db79b71cfdc4b1d72a3c3665dee777fe7ba7249d
  Author: Sosuke Suzuki <aosuk...@gmail.com>
  Date:   2025-03-07 (Fri, 07 Mar 2025)

  Changed paths:
    A JSTests/microbenchmarks/array-prototype-copyWithin-contiguous.js
    A JSTests/microbenchmarks/array-prototype-copyWithin-double.js
    A JSTests/microbenchmarks/array-prototype-copyWithin-int32.js
    A JSTests/stress/array-prototype-copyWithin-contiguous.js
    A JSTests/stress/array-prototype-copyWithin-double.js
    A JSTests/stress/array-prototype-copyWithin-int32.js
    M Source/JavaScriptCore/builtins/ArrayPrototype.js
    M Source/JavaScriptCore/runtime/ArrayPrototype.cpp
    M Source/JavaScriptCore/runtime/CommonIdentifiers.h
    M Source/JavaScriptCore/runtime/JSArray.cpp
    M Source/JavaScriptCore/runtime/JSArray.h

  Log Message:
  -----------
  [JSC] Implement `Array.prototype.copyWithin` in C++
https://bugs.webkit.org/show_bug.cgi?id=289237

Reviewed by Yusuke Suzuki.

This patch implements `Array#copyWithin` in C++ using `memmove`.

                                               TipOfTree                  
Patched

array-prototype-copyWithin-contiguous      451.9835+-25.0049    ^    
258.7830+-1.3483        ^ definitely 1.7466x faster
array-prototype-copyWithin-double          386.9415+-1.3776     ^    
258.2341+-4.6019        ^ definitely 1.4984x faster
array-prototype-copyWithin-int32           345.7076+-2.5341     ^    
244.2431+-1.7288        ^ definitely 1.4154x faster

* JSTests/microbenchmarks/array-prototype-copyWithin-int32.js: Added.
(test):
* Source/JavaScriptCore/runtime/ArrayPrototype.cpp:
(JSC::ArrayPrototype::finishCreation):
(JSC::JSC_DEFINE_HOST_FUNCTION):
* Source/JavaScriptCore/runtime/CommonIdentifiers.h:
* Source/JavaScriptCore/runtime/JSArray.cpp:
(JSC::JSArray::fastCopywithin):
* Source/JavaScriptCore/runtime/JSArray.h:

Canonical link: https://commits.webkit.org/291766@main



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