[all-commits] [llvm/llvm-project] 7c3bbf: [X86] lowerShuffleAsLanePermuteAndPermute - simpli...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7c3bbfdcf62e0a8806e3ae3130e8dc537fe5c775
      https://github.com/llvm/llvm-project/commit/7c3bbfdcf62e0a8806e3ae3130e8dc537fe5c775
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-11-11 (Mon, 11 Nov 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/pr40730.ll
    M llvm/test/CodeGen/X86/vector-replicaton-i1-mask.ll
    M llvm/test/CodeGen/X86/vector-shuffle-256-v16.ll
    M llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll

  Log Message:
  -----------
  [X86] lowerShuffleAsLanePermuteAndPermute - simplify lane crossing mask based on demanded elts

Don't demand every element of each demanded sublane - set the undemanded mask elements to UNDEF to allow simplification (usually to a VBROADCAST).

Fixes #66150



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