[PATCH] D91719: [RISCV] Add support for using -msave-restore with tailcalls

[Edward Jones via Phabricator via llvm-commits]

edward-jones updated this revision to Diff 338542.
edward-jones added a comment.
Herald added a subscriber: vkmr.

I have updated this so that the generation of the address passed to the restore functions is done in a separate method `RISCVFrameLowering::buildAddr`. This handles both the code models and mirrors `RISCVISelLowering::getAddr` - it would be nice if these functions could share code, or at least be in a common place.

I've also opened a pull request to document the existing `-msave-restore` behaviour in riscv-toolchain-conventions <https://github.com/riscv/riscv-toolchain-conventions/pull/9>, and I have a follow up patch to document the tail call versions of the entry points too.

I've expanded the test to cover the different code models, and pic mode too.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91719/new/

https://reviews.llvm.org/D91719

Files:
  llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
  llvm/lib/Target/RISCV/RISCVFrameLowering.h
  llvm/lib/Target/RISCV/RISCVMachineFunctionInfo.h
  llvm/test/CodeGen/RISCV/saverestore.ll
  llvm/test/CodeGen/RISCV/saverestore_tailcall.ll

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