[llvm-branch-commits] [llvm] release/22.x: [AArch64] Add new pass after VirtRegRewriter to add implicit-defs (#174188) (PR #176197)

[Cullen Rhodes via llvm-branch-commits]

c-rhodes wrote:

> > @gbossu @gbossu @sdesmalen-arm What do you think about merging this PR to the release branch?
> 
> We'd like to enable sub-register liveness for streaming functions to let the compiler make better use of SME2 multi-vector instructions. These patches allow us to do that. We've tested this on a variety of workloads with sub-register liveness tracking enabled (for non-streaming functions to expand coverage).

this seems like a pretty big change and given how little time it's been on main that makes me a bit nervous tbh, is this limited in scope so it can only affect streaming functions?

https://github.com/llvm/llvm-project/pull/176197