[PATCH] D115224: [RISCV] Support named opcodes in .insn directive.

[Nelson Chu via Phabricator via llvm-commits]

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This patch is one of the TODO of commit, 283879793dc787225992496587581ec77b6b0610 <https://reviews.llvm.org/rG283879793dc787225992496587581ec77b6b0610>

We build the GenericTable for these opcodes, and also extend class RISCVOpcode, to store the names of opcodes.  Then we call the parseInsnDirectiveOpcode to parse the opcode filed in .insn directive. 
 We only allow users to write the recognized opcode names, or just write the immediate values in the 7 bits range.

Besides, for the llvm/lib/Target/RISCV/RISCVInstrInfoZb.td, replace RISCVOpcode<xxx> with the defined OPC_OP_IMM and OPC_OP_IMM_32.

Documentation: https://sourceware.org/binutils/docs-2.37/as/RISC_002dV_002dFormats.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115224

Files:
  llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
  llvm/lib/Target/RISCV/RISCVInstrFormats.td
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
  llvm/test/MC/RISCV/insn-invalid.s
  llvm/test/MC/RISCV/insn.s

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