[PATCH] D108999: [RISCV] Custom lower VP_STORE and VP_LOAD

[Fraser Cormack via Phabricator via llvm-commits]

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This patch adds support for the vector-predicated `VP_STORE` and
`VP_LOAD` nodes. We do this in the same way we lower `MSTORE` and
`MLOAD`: to regular load/store instructions via intrinsics.

One necessary change was made to `SelectionDAGLegalize` so that
`VP_STORE` nodes' operation actions are taken from the stored "value"
operands, in the same vein as `STORE` or `MSTORE`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D108999

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vpload.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vpstore.ll
  llvm/test/CodeGen/RISCV/rvv/vpload.ll
  llvm/test/CodeGen/RISCV/rvv/vpstore.ll

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