[PATCH] D135233: [VP][RISCV] Add vp.roundtozero and its RISC-V support

[Yueh-Ting (eop) Chen via Phabricator via llvm-commits]

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The scalar instruction of this is `llvm.trunc`. However the naming of
ISD::VP_TRUNC is already taken by `trunc` of the LLVM IR. Naming this as
`vp.ftrunc` would likely cause confusion with `vp.fptrunc`. So adding
`vp.roundtozero` that will look similar to `vp.roundeven`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135233

Files:
  llvm/docs/LangRef.rst
  llvm/include/llvm/IR/Intrinsics.td
  llvm/include/llvm/IR/VPIntrinsics.def
  llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-roundtozero-vp.ll
  llvm/test/CodeGen/RISCV/rvv/roundtozero-vp.ll
  llvm/unittests/IR/VPIntrinsicTest.cpp

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