[PATCH] D151468: [RISCV] Use v(f)slide1up for shuffle+insert idiom

[Philip Reames via Phabricator via llvm-commits]

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This is pretty straight forward in the basic form.  I did need to move the slideup matching earlier, but that looks generally profitable on it's own.

As follow ups, I plan to explore the v(f)slide1down variants, and see what I can do to canonicalize the shuffle then insert pattern (see _inverse tests at the end of the vslide1up.ll test).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151468

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

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