[all-commits] [llvm/llvm-project] 6cbd91: [AArch64][GlobalISel] Combine G_UNMERGE(G_DUPLANE1...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6cbd91ea52cbf2b27dc92557cea64f5fd305fcf1
      https://github.com/llvm/llvm-project/commit/6cbd91ea52cbf2b27dc92557cea64f5fd305fcf1
  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
    A llvm/test/CodeGen/AArch64/GlobalISel/postlegalizer-combiner-unmergedup.mir
    M llvm/test/CodeGen/AArch64/arm64-dup.ll
    M llvm/test/CodeGen/AArch64/arm64-neon-2velem.ll
    M llvm/test/CodeGen/AArch64/arm64-neon-copy.ll
    M llvm/test/CodeGen/AArch64/arm64-neon-v8.1a.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Combine G_UNMERGE(G_DUPLANE16) -> G_DUPLANE16 (#142731)

We will generate G_UNMERGE(G_DUPLANE16) due to the legalization of
shuffle vector splats with mismatching vector sizes. The G_DUPLANE
intrinsics can handle different vector sizes (128bit and 64bit output,
for example), and we can combine away the unmerge.



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