[PATCH] D91457: [RISCV] Custom type legalize i32 bswap/bitreverse to GREVIW on RV64 with Zbp extension

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
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Currently we require a sra to pattern match these properly in isel. If the consumer didn't need the result sign extended we'll have an srl instead of sra and fail to match.

This patch switches to custom legalizing to GREVIW using portions of D91259 <https://reviews.llvm.org/D91259>.


https://reviews.llvm.org/D91457

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/lib/Target/RISCV/RISCVInstrInfoB.td
  llvm/test/CodeGen/RISCV/rv64Zbp.ll

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