[PATCH] D141984: [RISCV][MC] Add support for experimental zfa extension(FLI instruction not included)

[Jun Sha via Phabricator via llvm-commits]

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[1/4] This implements experimental support for the RISCV Zfa extension as specified here: https://github.com/riscv/riscv-isa-manual/releases/download/draft-20221119-5234c63/riscv-spec.pdf, Ch. 25. This extension has not been ratified. Once ratified, it'll move out of experimental status.

This change only adds assembly support for instructions except load-immediate instructions (fli.s/fli.d/fli.h).


https://reviews.llvm.org/D141984

Files:
  llvm/lib/Target/RISCV/RISCV.td
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZfa.td
  llvm/test/MC/RISCV/rv32zfa-only-valid.s
  llvm/test/MC/RISCV/rv32zfa-valid.s

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