[PATCH] D151742: [RISCV] Use v(f)slide1down for shuffle+insert idiom

[Philip Reames via Phabricator via llvm-commits]

reames created this revision.
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This is a follow up to D151468 <https://reviews.llvm.org/D151468> which added the vslide1down case as a sub-case of vslide1down matching.  This generalizes that code into generic mask matching - specifically to point out the sub-vector insert restriction in the original patch.  Since the matching logic is basically the same, go ahead and support vslide1up at the same time.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151742

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vector-shuffle-vslide1down.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vector-shuffle-vslide1up.ll

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