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Re:Apple CPU tricks: memory reordering, JavaScript support, ... by _kbh_ on Friday November 27, 2020 @07:42PM (#25234014)
I think I found the answer in this tweet.

https://twitter.com/Catfish_Man/status/1326298205034696705

Heres a snipped quote.

"this further improvement is because uncontended acquire-release atomics are about the same speed as regular load/store on A14"

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