[all-commits] [llvm/llvm-project] acd264: [AArch64][GlobalISel] Prefer DUPLANE to REV and ot...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: acd264d0ace52c7fd4d10a20bd20a739040058c7
      https://github.com/llvm/llvm-project/commit/acd264d0ace52c7fd4d10a20bd20a739040058c7
  Author: David Green <david.green at arm.com>
  Date:   2025-06-09 (Mon, 09 Jun 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64Combine.td
    M llvm/test/CodeGen/AArch64/GlobalISel/postlegalizer-lowering-ext.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/postlegalizer-lowering-rev.mir
    M llvm/test/CodeGen/AArch64/arm64-neon-add-pairwise.ll
    M llvm/test/CodeGen/AArch64/arm64-neon-v8.1a.ll
    M llvm/test/CodeGen/AArch64/bitcast.ll
    M llvm/test/CodeGen/AArch64/dup.ll
    M llvm/test/CodeGen/AArch64/shufflevector.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Prefer DUPLANE to REV and other shuffles (#142725)

Some shuffles containing undefs can match multiple instructions, such as
<3,u,u,u> being either a duplane or a rev. This changes the order that
different shuffles are considered, so that duplane is preferred which is
simpler and more likely to lead to further combines.



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