[PATCH] D123983: [RISCV] Fold (xor (sllw 1, x), -1) -> (rolw ~1, x).

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
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There's an existing generic combine that does this for legal types.
This patch adds a RISCV specific combine for W instructions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123983

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rv32zbb-zbp-zbkb.ll
  llvm/test/CodeGen/RISCV/rv64zbb-zbp-zbkb.ll
  llvm/test/CodeGen/RISCV/sextw-removal.ll

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