[all-commits] [llvm/llvm-project] 60be17: [RISCV] Add VFCVT pseudos with no mask

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 60be17a68521642ed2a5d59097065b86113808ef
      https://github.com/llvm/llvm-project/commit/60be17a68521642ed2a5d59097065b86113808ef
  Author: Luke Lau <luke at igalia.com>
  Date:   2023-07-05 (Wed, 05 Jul 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
    M llvm/test/CodeGen/RISCV/rvv/ctlz-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/cttz-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/double-round-conv.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-ctlz.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-cttz.ll
    M llvm/test/CodeGen/RISCV/rvv/float-round-conv.ll
    M llvm/test/CodeGen/RISCV/rvv/half-round-conv.ll

  Log Message:
  -----------
  [RISCV] Add VFCVT pseudos with no mask

When emitting a vfcvt with a rounding mode, we end up generating an unnecessary
vmset because the only rounding mode pseudos have a mask operand. This patch
adds a pseudo without a mask, and marks the masked variant with the
MaskedPseudo class so the doPeepholeMergeVMV optimisation knows to remove the
redundant vmset.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D154266