[all-commits] [llvm/llvm-project] 2b5222: [X86] SimplifyDemandedVectorEltsForTargetNode - ad...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2b5222b1927fbe89d9d6a72a63f5dca2d457565f
      https://github.com/llvm/llvm-project/commit/2b5222b1927fbe89d9d6a72a63f5dca2d457565f
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-05-16 (Fri, 16 May 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-shuffle-256-v4.ll

  Log Message:
  -----------
  [X86] SimplifyDemandedVectorEltsForTargetNode - add X86ISD::MOVDDUP handling (#140237)

Reduce YMM MOVDDUP node to XMM if the upper elements are not demanded

Noticed while working on #140234



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