[all-commits] [llvm/llvm-project] 71cbaa: [AArch64] Combine truncate(buildvector) -> buildve...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 71cbaace075d39f87063afa9d0da165ee04345b3
      https://github.com/llvm/llvm-project/commit/71cbaace075d39f87063afa9d0da165ee04345b3
  Author: David Green <david.green at arm.com>
  Date:   2026-09-28 (Mon, 28 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/binopshuffles.ll
    M llvm/test/CodeGen/AArch64/fp-intrinsics-vector.ll
    M llvm/test/CodeGen/AArch64/neon-truncstore.ll
    M llvm/test/CodeGen/AArch64/store.ll
    M llvm/test/CodeGen/AArch64/sve-extract-vector-to-predicate-store.ll
    M llvm/test/CodeGen/AArch64/vec3-loads-ext-trunc-stores.ll

  Log Message:
  -----------
  [AArch64] Combine truncate(buildvector) -> buildvector (#223787)

If late in the pipeline we are left with truncate(buildvector), we can
generate the buildvector directly. This helps remove the xtn and can
lead to other simplification.



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