[llvm-branch-commits] [llvm] AMDGPU: Add a subtarget feature for fine-grained remote memory support (PR #96442)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

> Hmm, I might need to reparse this but I'm not entirely sure how this is expected to work in general since PCI-E attachment is not always / entirely knowable at compile time. Have I missed some preamble discussion here?

We do statically know for some of the targets (mostly gfx12 and gfx940) that it's supposed to work. This is the "scope downgrade" vs. "nop" cases in the atomic support table 

https://github.com/llvm/llvm-project/pull/96442