[PATCH] D96681: [RISCV][LegalizeTypes] Try to expand BITREVERSE before promoting if the promoted BITREVERSE would expand anyway.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
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If we're going to end up expanding anyway, we should do it early
so we don't create extra operations to handle the bytes added by
promotion.

Simlilar was done for BSWAP previously.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96681

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/RISCV/rv32Zbp.ll
  llvm/test/CodeGen/RISCV/rv64Zbp.ll

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