[webkit-changes] [WebKit/WebKit] 1dd4e8: [JSC] Fold GetArrayLength(String) in DFG

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 1dd4e87c56d58f0d85546b40e933a0c1699cb748
      https://github.com/WebKit/WebKit/commit/1dd4e87c56d58f0d85546b40e933a0c1699cb748
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2023-06-29 (Thu, 29 Jun 2023)

  Changed paths:
    M Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h

  Log Message:
  -----------
  [JSC] Fold GetArrayLength(String) in DFG
https://bugs.webkit.org/show_bug.cgi?id=258657
rdar://111492563

Reviewed by Michael Saboff.

Add DFG AI rule which folds GetArrayLength(constant-string) to constant number since String's length is immutable.

* Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h:
(JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):

Canonical link: https://commits.webkit.org/265613@main