[PATCH] D102839: [RISCV][Clang] Add -mno-idiv option to disable hardware int division

[ksyx via Phabricator via cfe-commits]

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With option `-mno-idiv`, hardware integral division and modulus instructions in M extension will be disabled, while leaving multiply instructions enabled.

I am not sure whether there is a better way of implementing this, so please point out if there is one, thanks.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102839

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/RISCV.cpp
  clang/lib/Basic/Targets/RISCV.h
  clang/lib/Driver/ToolChains/Arch/RISCV.cpp
  clang/test/Driver/riscv-no-idiv.c
  llvm/lib/Target/RISCV/RISCV.td
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfoM.td
  llvm/lib/Target/RISCV/RISCVSubtarget.h
  llvm/test/CodeGen/RISCV/no-idiv.ll
  llvm/test/MC/RISCV/rv32m-no-idiv-div.s
  llvm/test/MC/RISCV/rv32m-no-idiv-mul.s
  llvm/test/MC/RISCV/rv64m-no-idiv-div.s
  llvm/test/MC/RISCV/rv64m-no-idiv-mul.s

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