[PATCH] D62190: [RISCV] Allow shrink wrapping for RISC-V

[Alex Bradbury via Phabricator via llvm-commits]

asb added a comment.

I note that the TargetFrameLowering hooks `canUseAsPrologue` and `canUseAsEpilogue` are both called by the shrink wrapper. They default to true, but targets may need to override this for correctness. Looking at e.g. AArch64, I see it overrides `canUseAsPrologue` and returns false in the case that the function needs stack realignment and there are no scratch registers available. Are you certain that no such case is needed for RISC-V?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62190/new/

https://reviews.llvm.org/D62190