It’s not a standard ARM register; it’s implementation-defined and nobody gave it... | Hacker News

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		pthariensflame on May 26, 2021 \| parent \| context \| favorite \| on: M1racles: An Apple M1 covert channel vulnerability It’s not a standard ARM register; it’s implementation-defined and nobody gave it a meaningful name. It appears to do nothing much.

exikyut on May 26, 2021 [–]

Then why not unofficially standardize its use in GCC and Clang's register-pooling subsystem?

saagarjha on May 26, 2021 | [–]

Because GCC and Clang don't get to decide what hardware does with the register…

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