[PATCH] D92345: [RISCV] WIP add DAG combining for rotates and GREVI

[Craig Topper via Phabricator via llvm-commits]

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This is an initial patch to enable combining (rotate (grev)) and (grev (rotate)). I've added a helper to match rotates that we care about. Not sure if I'm happy with it yet. The match needs more test cases.


https://reviews.llvm.org/D92345

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfoB.td

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