[PATCH] D158853: [SDAG] Add SimplifyDemandedBits support for ISD::SPLAT_VECTOR_PARTS

[Luke Lau via Phabricator via llvm-commits]

luke created this revision.
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Similar to https://reviews.llvm.org/D158839, this allows some shift and rotate
operations on RV32 to better select an immediate or scalar operand, due to the
upper bits of the splat being marked as undef.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158853

Files:
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/vnsrl-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vwsll-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vwsll-vp.ll

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