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...alloca. 2. Add an intrinsic gcref.copy which copies a gcref between two allocas. 3. Add intrinsics gcref.load_gcref(GCREF*, GCREF*, offset) and gcref.store_gcref(GCREF*, GCREF*, offset, value) which load and store a gcref through a gcref. 4. Add intrinsics gcref.load_value(GCREF*, offset) and gcref.store_value(GCREF*, offset, value) which load and store normal values a gcref. 5. The statepoint lowering pass gets rid of the allocas. Keeping GCREFs exclusively in memory means the LLVM optimizer will handle them conservatively, but correctly. I guess the problem with this is precisely that the LLVM optim...

This is a proposal to add strong GC reference types to LLVM. We have some local (downstream) patches that are needed to prevent LLVM's optimizer from making transforms that are problematic in the presence of a precise relocating GC. Adding a notion of a strong GC reference to LLVM will let us upstream these patches in a principled manner, and will act as a measure to avoid new problematic