[PATCH] D143982: [RISCV][CodeGen] Add codegen pattern for experimental zfa extension (FLI and FCVTMOD not included)

[Jun Sha via Phabricator via llvm-commits]

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This patch implements experimental support for the RISCV Zfa extension except FLI and FCVTMOD instructions 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 adds codegen support.


https://reviews.llvm.org/D143982

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfoZfa.td
  llvm/test/CodeGen/RISCV/double-zfa.ll
  llvm/test/CodeGen/RISCV/float-zfa.ll
  llvm/test/CodeGen/RISCV/half-zfa.ll

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