[llvm] [AMDGPU] Fix GCNUpwardRPTracker. (WIP) (PR #71186)

[Valery Pykhtin via llvm-commits]

vpykhtin wrote:

> I can understand how the upward tracker can work like that, but how does the downward tracker work? When it sees a use operand, it does not know if it is the last use of that register.

Downward tracker is different, it wasn't supposed to be used like that, and therefore it has different interface.



https://github.com/llvm/llvm-project/pull/71186