[PATCH] D48411: [RISCV] Support for __attribute__((interrupt))

[Ana Pazos via Phabricator via llvm-commits]

apazos created this revision.
apazos added a reviewer: asb.
Herald added subscribers: rogfer01, mgrang, edward-jones, zzheng, shiva0217, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar.

- Save all GRPs at prologue and restore them at epilogue of functions with  "interrupt" attribute.
- Emit special return instructions depending on "interrupt" attribute type.

Patch by Zhaoshi Zheng.


https://reviews.llvm.org/D48411

Files:
  lib/Target/RISCV/RISCVCallingConv.td
  lib/Target/RISCV/RISCVFrameLowering.cpp
  lib/Target/RISCV/RISCVISelLowering.cpp
  lib/Target/RISCV/RISCVISelLowering.h
  lib/Target/RISCV/RISCVInstrInfo.cpp
  lib/Target/RISCV/RISCVInstrInfo.td
  lib/Target/RISCV/RISCVRegisterInfo.cpp
  lib/Target/RISCV/RISCVSubtarget.cpp
  test/CodeGen/RISCV/interrupt-attr-args-error.ll
  test/CodeGen/RISCV/interrupt-attr-invalid.ll
  test/CodeGen/RISCV/interrupt-attr-ret-error.ll
  test/CodeGen/RISCV/interrupt-attr.ll

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