[PATCH] D159147: [DAGCombiner] Combine trunc (splat_vector x) -> splat_vector (trunc x)

[Luke Lau via Phabricator via llvm-commits]

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>From the discussion in https://reviews.llvm.org/D158853, moving the truncate
into the splat helps more splatted scalar operands get selected on RISC-V, and
also avoids the need for splat_vector_parts on RV32.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159147

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.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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