[PATCH] D40830: [RISCV] Implement support for the BranchRelaxation pass

[Alex Bradbury via Phabricator via llvm-commits]

asb created this revision.
Herald added subscribers: jordy.potman.lists, simoncook, johnrusso, rbar.

Branch relaxation is needed to support branch displacements that overflow the instruction's immediate field.

This is the last non-trivial patch required for a 100% pass rate of the GCC torture suite targeting RV32I.

The churn in bswap-ctlz-cttz-ctpop.ll and jumptable.ll seems unfortunate, but I don't think it's caused by lib/Target/RISCV logic.


https://reviews.llvm.org/D40830

Files:
  lib/Target/RISCV/RISCVInstrInfo.cpp
  lib/Target/RISCV/RISCVInstrInfo.h
  lib/Target/RISCV/RISCVMCInstLower.cpp
  lib/Target/RISCV/RISCVRegisterInfo.h
  lib/Target/RISCV/RISCVTargetMachine.cpp
  test/CodeGen/RISCV/analyze-branch.ll
  test/CodeGen/RISCV/branch-relaxation.ll
  test/CodeGen/RISCV/bswap-ctlz-cttz-ctpop.ll
  test/CodeGen/RISCV/jumptable.ll

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