[PATCH] D44886: [RISCV] Support linker relax function call from auipc and jalr to jal

[Shiva Chen via Phabricator via llvm-commits]

shiva0217 created this revision.
shiva0217 added reviewers: asb, apazos.
Herald added subscribers: kito-cheng, niosHD, sabuasal, jordy.potman.lists, simoncook, johnrusso, rbar.

To do this:

1. Add fixup_riscv_call and fixup_riscv_relax fixup types which eventually will transfer to R_RISCV_CALL and R_RISCV_RELAX relocation types.

2. Deine FeatureRelax to enable/disable linker relaxation.

3. Add VK_RISCV_CALL_HI and VK_RISCV_CALL_LO RISCVMCExpr to recognize the function call expression.

4. Leave relocation types when linker relaxation enabled.

5. Insert R_RISCV_CALL and R_RISCV_RELAX relocation types to auipc function call expression when linker relaxation enabled.


Repository:
  rL LLVM

https://reviews.llvm.org/D44886

Files:
  lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
  lib/Target/RISCV/MCTargetDesc/RISCVELFObjectWriter.cpp
  lib/Target/RISCV/MCTargetDesc/RISCVFixupKinds.h
  lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
  lib/Target/RISCV/MCTargetDesc/RISCVMCExpr.cpp
  lib/Target/RISCV/MCTargetDesc/RISCVMCExpr.h
  lib/Target/RISCV/RISCV.td
  lib/Target/RISCV/RISCVAsmPrinter.cpp
  lib/Target/RISCV/RISCVSubtarget.h
  test/CodeGen/RISCV/linker-relaxation.ll

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