[PATCH] D108987: [RISCV] Custom lower VP_SCATTER and VP_GATHER

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck created this revision.
frasercrmck added reviewers: craig.topper, HsiangKai, rogfer01, evandro.
Herald added subscribers: vkmr, luismarques, apazos, sameer.abuasal, s.egerton, Jim, benna, psnobl, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, edward-jones, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar, asb, hiraditya.
frasercrmck requested review of this revision.
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This patch adds support for the `VP_SCATTER` and `VP_GATHER` nodes by
lowering them to RVV's `vsox`/`vlux` instructions, respectively. This
process is almost identical to the existing `MSCATTER`/`MGATHER` support.

One extra change was made to `SelectionDAGLegalize` so that
`VP_SCATTER`'s operation action is derived from its stored "value"
operand rather than its return type (which is always the chain).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D108987

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-vpgather.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vpscatter.ll
  llvm/test/CodeGen/RISCV/rvv/vpgather-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vpscatter-sdnode.ll

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