[PATCH] D146747: [RISCV] Model select and insertsubvector shuffle kinds

[Luke Lau via Phabricator via llvm-commits]

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These types of shuffles get lowered as a vmerge with a potential
vslide{up,down}.
There is still room for improvement in modeling these types, including
concatenating shuffles which are designated SK_InsertSubvector. These
can be lowered to one vslideup provided the types are legal. (And
sometimes, if the concatenated shuffle is used in something like an
interleave shuffle, then it has no cost at all. But there isn't any way
to detect that from the target hooks.)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146747

Files:
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll
  llvm/test/Analysis/CostModel/RISCV/shuffle-insert.ll
  llvm/test/Analysis/CostModel/RISCV/shuffle-interleave.ll
  llvm/test/Analysis/CostModel/RISCV/shuffle-select.ll
  llvm/test/Transforms/SLPVectorizer/RISCV/reductions.ll

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