[all-commits] [llvm/llvm-project] c75353: [X86] combineConcatVectorOps - add 256-bit concat(...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c75353313ed73c6dc04beb322954bb905906f4a1
      https://github.com/llvm/llvm-project/commit/c75353313ed73c6dc04beb322954bb905906f4a1
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-11-06 (Wed, 06 Nov 2024)

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

  Log Message:
  -----------
  [X86] combineConcatVectorOps - add 256-bit concat(shuffle(),shuffle()) handling

Improve IsConcatFree detection to handle splat vector-loads (which can be folded as X86ISD::SUBV_BROADCAST_LOAD).

Fixes #114959



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