[PATCH] D147610: [RISCV][MC] Add support for experimental Zfbfmin extension

[Alex Bradbury via Phabricator via cfe-commits]

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As documented, this extension includes FLH, FSH, FMV.H.X, and FMH.X.H as defined in Zfh/Zfhmin, but doesn't require either extension.

No Zfbfinxmin has been defined (though you would expect one in the future, for symmetry with Zfhinxmin). See issue https://github.com/riscv/riscv-bfloat16/issues/27.

This patch is not ready for merging because the fcvt.bf16.s encoding collides with fround.h from zfa. See issue https://github.com/riscv/riscv-bfloat16/issues/33. Applying this patch causes tests failures due to this. Posting in order to allow early review, though I intended to wait for the encoding clash to be resolved before pushing to get this committed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147610

Files:
  clang/test/Preprocessor/riscv-target-features.c
  llvm/docs/RISCVUsage.rst
  llvm/docs/ReleaseNotes.rst
  llvm/lib/Support/RISCVISAInfo.cpp
  llvm/lib/Target/RISCV/RISCVFeatures.td
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZfbfmin.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td
  llvm/lib/Target/RISCV/RISCVSubtarget.h
  llvm/test/CodeGen/RISCV/attributes.ll
  llvm/test/MC/RISCV/attribute-arch.s
  llvm/test/MC/RISCV/rv32zfbfmin-invalid.s
  llvm/test/MC/RISCV/rv32zfbfmin-valid.s
  llvm/test/MC/RISCV/rv64zhinx-invalid.s
  llvm/test/MC/RISCV/rv64zhinxmin-invalid.s

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