[all-commits] [llvm/llvm-project] c7bb36: [X86] SimplifyDemandedBitsForTargetNode - fold MOV...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c7bb3665a1c4a06754e486d8567182821fa32b55
      https://github.com/llvm/llvm-project/commit/c7bb3665a1c4a06754e486d8567182821fa32b55
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-01-28 (Fri, 28 Jan 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/combine-movmsk-avx.ll

  Log Message:
  -----------
  [X86] SimplifyDemandedBitsForTargetNode - fold MOVMSK(YMM) -> MOVMSK(XMM)

If we don't demand the upper elements of the 256-bit vector, then just perform as a 128-bit vector