[PATCH] D62686: [WIP][RISCV] Add support for save/restore of CSRs via libcalls

[Lewis Revill via Phabricator via llvm-commits]

lewis-revill created this revision.
lewis-revill added reviewers: asb, edward-jones.
Herald added subscribers: llvm-commits, benna, psnobl, jocewei, PkmX, rkruppe, the_o, brucehoult, MartinMosbeck, rogfer01, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, apazos, johnrusso, rbar.
Herald added a project: LLVM.

This patch adds the support required for using the __riscv_save and __riscv_restore libcalls to implement a size-optimization for prologue and epilogue code, whereby the spill and restore code of callee-saved registers is implemented by common functions to reduce code duplication.

The initial prototype for this patch was implemented by @simoncook


Repository:
  rL LLVM

https://reviews.llvm.org/D62686

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

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