[PATCH] D62685: [RISCV] Add pseudo instruction for calls with explicit register

[Lewis Revill via Phabricator via llvm-commits]

lewis-revill created this revision.
lewis-revill added reviewers: asb, simoncook, 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 PseudoCALLReg instruction which allows using an explicit register operand as the destination for the return address.

GCC can successfully parse this form of the call instruction, which would be used for calls to functions which do not use `ra` as the return address register, such as the `__riscv_save` libcalls. This patch forms the first part of an implementation of `-msave-restore` for RISC-V.


Repository:
  rL LLVM

https://reviews.llvm.org/D62685

Files:
  lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
  lib/Target/RISCV/RISCVInstrInfo.cpp
  lib/Target/RISCV/RISCVInstrInfo.td
  test/MC/RISCV/function-call.s

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