[PATCH] D155041: [RISCV] Remove unnecessary move of undefined with subregister liveness enabled

[Philip Reames via Phabricator via llvm-commits]

reames added a comment.

Can you take a step back and describe what the motivating code here is?  The description on the change seems to start from a level of detail, which makes it hard to reverse back to your motivation.  I think you must be seeing overly constrained register allocation on some example, but which example?

Also, you may find https://reviews.llvm.org/D156709 partially addresses the same issue.  Not sure as without the original example, or something reasonable illustrative, it's hard to tell what you're trying to do here.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155041/new/

https://reviews.llvm.org/D155041