[all-commits] [llvm/llvm-project] 117d75: [DAG] SimplifyDemandedBits - use ComputeKnownBits ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 117d755b1b84c7d379ea5c3d93f8c2ab9bfcde82
      https://github.com/llvm/llvm-project/commit/117d755b1b84c7d379ea5c3d93f8c2ab9bfcde82
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-05-16 (Thu, 16 May 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/AArch64/sadd_sat_vec.ll
    M llvm/test/CodeGen/AArch64/ssub_sat_vec.ll
    M llvm/test/CodeGen/PowerPC/pr44183.ll
    M llvm/test/CodeGen/RISCV/rvv/bitreverse-sdnode.ll
    M llvm/test/CodeGen/X86/vector_splat-const-shift-of-constmasked.ll

  Log Message:
  -----------
  [DAG] SimplifyDemandedBits - use ComputeKnownBits instead of getValidShiftAmountConstant to check for constant shift amounts. (#92412)

This allows us to handle cases where the constant has already been type legalized behind a bitcast

Despite calling ComputeKnownBits I'm not seeing any notable change in compile time.



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