[all-commits] [llvm/llvm-project] eb75f2: [RISCV][LegalizeTypes] Try to expand BITREVERSE be...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: eb75f250feb6822d57be95e8535e28724cde6e9d
      https://github.com/llvm/llvm-project/commit/eb75f250feb6822d57be95e8535e28724cde6e9d
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2021-02-15 (Mon, 15 Feb 2021)

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

  Log Message:
  -----------
  [RISCV][LegalizeTypes] Try to expand BITREVERSE before promoting if the promoted BITREVERSE would expand anyway.

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.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D96681