[PATCH] D122563: [RISCV] Add DAGCombine to fold base operation and reduction.

[Yeting Kuo via Phabricator via llvm-commits]

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Transform (<bop> x, (reduce.<bop> vec, splat(neutral_element))) to
(reduce.<bop> vec, splat (x)).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122563

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-fp.ll
  llvm/test/CodeGen/RISCV/rvv/fold-binary-reduce.ll
  llvm/test/CodeGen/RISCV/rvv/vreductions-fp-sdnode.ll

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