[PATCH] D65902: [ObjC][ARC] Upgrade calls to ARC runtime functions to intrinsic calls if the bitcode has the arm64 retainAutoreleasedReturnValue marker

[Akira Hatanaka via Phabricator via llvm-commits]

ahatanak added a comment.

Since ARC optimizer needs `clang.arc.use` to correctly move or remove retain/release pairs (see the comment in `TopDownPtrState::HandlePotentialAlterRefCount`), I think we should unconditionally upgrade the intrinsic calls instead of removing them  even when the bitcode doesn't have the arm64 marker. I'll update the patch to convert `clang.arc.use` to `llvm.objc.clang.arc.use`.


Repository:
  rL LLVM

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https://reviews.llvm.org/D65902