[llvm-branch-commits] [llvm] AMDGPU: Introduce a pass to replace VGPR MFMAs with AGPR (PR #145024)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

> > Do you assume that at this stage there are no accvgpr_write/read instructions, but only COPY?
> 
> Yes, you should never use those for actual copies. Not using COPY always hurts optimizations

But this only needs to handle the specific patterns produced by SplitKit, which always use copy 

https://github.com/llvm/llvm-project/pull/145024