[PATCH] D86836: Support a list of CostPerUse values

[Alex Bradbury via Phabricator via llvm-commits]

asb added a comment.

It looks like others are reviewing the implementation details, but I just wanted to chime in to say that this looks like a useful feature for the RISC-V backend too. Currently we set CostPerUse for some registers in order to tweak register allocation in a way that benefits codegen when the compressed instruction set extension is enabled. Although the impact is _very_ minimal, this slightly harms targets that don't support the compressed instruction set (admittedly, this isn't really true of any shipping RISC-V processor so not a big concern). It would be good to use this vary the CostPerUse depending on target RISC-V features.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D86836/new/

https://reviews.llvm.org/D86836