[llvm] [AMDGPU][Doc] GFX12.5 Barrier Execution Model (PR #185632)

[Nicolai Hähnle via llvm-commits]

https://github.com/nhaehnle commented:

I haven't had the chance to properly dig into this, but here's a random thought: Have you considered explicitly blessing the notion of a barrier phase? Basically, the phase is a natural number that counts how often the barrier has completed. We can then talk about signals "belonging" to a phase.

https://github.com/llvm/llvm-project/pull/185632