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That has come up already. The M1 does thread local storage in a different way than other aarch64 CPUs.

http://www.jakubkonka.com/2021/01/21/llvm-tls-apple-silicon....




It’s not the M1 chip by itself, but rather is macOS/iOS.


I think it's both. Mimalloc had to use a different register: https://github.com/microsoft/mimalloc/issues/343


It’s the macOS/iOS ABI solely. It isn’t related in any way to the hardware itself.




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