[all-commits] [llvm/llvm-project] 070877: [DAG] MaskedVectorIsZero - don't bother with (-1)....

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0708771cce056c3bf9b89793ebb5aa5305b194b5
      https://github.com/llvm/llvm-project/commit/0708771cce056c3bf9b89793ebb5aa5305b194b5
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-07-24 (Sun, 24 Jul 2022)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/lib/Target/X86/X86ISelLowering.cpp

  Log Message:
  -----------
  [DAG] MaskedVectorIsZero - don't bother with (-1).isSubsetOf mask check. NFC.

Just use KnownBits::isZero() to ensure all the bits are known zero.