[PATCH] D62686: [WIP][RISCV] Add support for save/restore of callee-saved registers via libcalls

[Lewis Revill via Phabricator via llvm-commits]

lewis-revill updated this revision to Diff 202421.
lewis-revill added a comment.
Herald added a subscriber: mgorny.

- Replaced split fixed/nonfixed vectors by simply interpreting the CSI vector differently depending if save/restore calls will be used or not.

- Add `UseSaveRestoreLibCalls` to `RISCVMachineFunctionInfo`, along with a modifying `getUseSaveRestoreLibCalls` accessor and a non-modifying `useSaveRestoreLibCalls` accessor.

- Add 'RISCVMachineFunctionInfo.cpp' to avoid having a `cl::opt` declared in a header file.

- Simplify `spillCalleeSavedRegisters` and `restoreCalleeSavedRegisters`.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62686/new/

https://reviews.llvm.org/D62686

Files:
  lib/Target/RISCV/CMakeLists.txt
  lib/Target/RISCV/RISCVFrameLowering.cpp
  lib/Target/RISCV/RISCVFrameLowering.h
  lib/Target/RISCV/RISCVMachineFunctionInfo.cpp
  lib/Target/RISCV/RISCVMachineFunctionInfo.h
  lib/Target/RISCV/RISCVRegisterInfo.cpp
  lib/Target/RISCV/RISCVRegisterInfo.h
  test/CodeGen/RISCV/saverestore.ll

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