alt Hacker NewsAh, that's a great hypothesis. I wonder, then, how it works with x86 emulation on ARM. IIRC, atomic ops on ARM fault if the address isn't naturally aligned... but I guess the runtime could intercept that and handle it slowly.
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BobbyTables2 • today at 3:05 AM
An emulated x86 atomic instruction wouldn’t need to use atomic instructions on ARM.
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ARM macs apparently have some kind of specific handling in place for this when a process is running with x86_64 compatibility, but it’s not publicly documented anywhere that I can see.