[webkit-changes] [WebKit/WebKit] 85de6d: [JSC] Implement Atomics.pause

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 85de6d11bebc5c44e11ddbab5e7129de3b457c69
      https://github.com/WebKit/WebKit/commit/85de6d11bebc5c44e11ddbab5e7129de3b457c69
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2024-10-09 (Wed, 09 Oct 2024)

  Changed paths:
    M JSTests/test262/config.yaml
    M Source/JavaScriptCore/runtime/AtomicsObject.cpp
    M Source/JavaScriptCore/runtime/Intrinsic.h
    M Source/JavaScriptCore/runtime/OptionsList.h

  Log Message:
  -----------
  [JSC] Implement Atomics.pause
https://bugs.webkit.org/show_bug.cgi?id=281121
rdar://137571229

Reviewed by Keith Miller.

This patch implements Atomics.pause[1] (currently it is stage-3).
We use,

1. On x64, using "pause"
2. On ARM64, using "isb sy" as it turned out that "yield" is effectively "nop"

[1]: https://tc39.es/proposal-atomics-microwait/

* JSTests/test262/config.yaml:
* Source/JavaScriptCore/runtime/AtomicsObject.cpp:
(JSC::AtomicsObject::finishCreation):
(JSC::JSC_DEFINE_HOST_FUNCTION):
* Source/JavaScriptCore/runtime/Intrinsic.h:
* Source/JavaScriptCore/runtime/OptionsList.h:

Canonical link: https://commits.webkit.org/284917@main



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