[PATCH] D133238: [RISCV] Improve vector fceil/ffloor lowering by changing FRM.

[Craig Topper via Phabricator via llvm-commits]

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This adds new VFCVT pseudoinstructions that take a rounding mode operand. A custom inserter is used to insert additional instructions to change FRM around the
VFCVT.

Some of this is borrowed from D122860 <https://reviews.llvm.org/D122860>, but takes a somewhat different direction. We may migrate to that patch, but for now I was trying to keep this as independent from 
RVV intrinsics as I could.

A followup patch will use this approach for FROUND too.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133238

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
  llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td
  llvm/test/CodeGen/RISCV/rvv/fceil-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/ffloor-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp.ll

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