PyPy Project looking for sponsorship to add support for Apple Silicon

Re:PyPy Project looking for sponsorship to add support for A... by oblio on Thursday December 31, 2020 @01:47PM (#25595699)

Isn't Apple doing the exact same thing with their proprietary ARM ISA extensions?

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Re:PyPy Project looking for sponsorship to add support for A... by my123 on Thursday December 31, 2020 @03:21PM (#25596706)

Their ISA extension is an ML-specific one, and macOS runs fine with it disabled. Their public compilers do not support it either.

You are supposed to use it through Accelerate.framework, which exposes a more traditional interface to that capability.

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Re:PyPy Project looking for sponsorship to add support for A... by skissane on Thursday December 31, 2020 @05:08PM (#25597751)

> Their ISA extension is an ML-specific one

Apple Silicon has more than one ISA extension.

There is also the x86 memory ordering extension used by Rosetta 2.

Maybe there are yet others too.

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Re:PyPy Project looking for sponsorship to add support for A... by my123 on Thursday December 31, 2020 @05:11PM (#25597770)

> There is also the x86 memory ordering extension used by Rosetta 2.

That one isn't really a requirement either, and is handled fully in kernel mode.

Wkdm and friends are handled fully in kernel mode.

APRR? Not a strict requirement for user-mode, JIT regions are just left as RWX without it.

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Re:PyPy Project looking for sponsorship to add support for A... by saagarjha on Thursday December 31, 2020 @06:35PM (#25598563)

Apple enforces APRR on macOS; you need to use their APIs to work within the confines of W^X.

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Re:PyPy Project looking for sponsorship to add support for A... by saagarjha on Thursday December 31, 2020 @06:35PM (#25598574)

There are more but they are not exposed to applications. Apple wants you to ship standard arm64 code.

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