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In the LLVM Language Reference Manual, there is a section on Objective-C ARC Runtime Intrinsics. It seems to exist to handle ARC-related logic in LLVM IR.

I'm curious whether Swift's ARC is also processed using these OBJC ARC Intrinsics, or if there is a separate one for Swift.

Does anyone know about this?

LLVM Language Reference Manual — LLVM 18.0.0git documentation

Objective-C Automatic Reference Counting (ARC) — Clang 18.0.0git documentation

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I would love to understand how this all works as well. I have been pondering forking Swift so I can get objc interop (by adjusting gnustep libobjc2) on Linux and some of the documentation regarding how objc is handled in swift is old.

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