[webkit-changes] [WebKit/WebKit] 3bc33c: [JSC] Do not emit jsUndefined constant

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 3bc33cf556e7a6b3c211af06777c10bc4984d34d
      https://github.com/WebKit/WebKit/commit/3bc33cf556e7a6b3c211af06777c10bc4984d34d
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2024-03-07 (Thu, 07 Mar 2024)

  Changed paths:
    M Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
    M Source/JavaScriptCore/llint/LLIntSlowPaths.cpp

  Log Message:
  -----------
  [JSC] Do not emit jsUndefined constant
https://bugs.webkit.org/show_bug.cgi?id=270662
rdar://124234204

Reviewed by Keith Miller.

We observed massive unnecessary mov due to this.

* Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp:
(JSC::PropertyListNode::emitBytecode):
* Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):

Canonical link: https://commits.webkit.org/275813@main



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