[PATCH] D145272: [RISCV] Teach performCombineVMergeAndVOps to combine unmasked TU vpmerge with a masked MU TA op.

[Craig Topper via Phabricator via llvm-commits]

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We can form a MU TU operation and remove the merge if they use the
same merge value.

My primary interest was a case involving VP intrinsics from our downstream,
but it requires another optimization that isn't in upstream yet. So I've used
RVV intrinsics to get the desired instructions.

Co-authored-by: Nitin John Raj <nitin.raj at sifive.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145272

Files:
  llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
  llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-masked-vops.ll

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