[all-commits] [llvm/llvm-project] 643c38: [AArch64] Remove EXT instr before UZP when extract...

[Lukacma via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 643c38333fc1b1e7e705e6e1035c595bbd95bc74
      https://github.com/llvm/llvm-project/commit/643c38333fc1b1e7e705e6e1035c595bbd95bc74
  Author: Lukacma <Marian.Lukac at arm.com>
  Date:   2024-05-09 (Thu, 09 May 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/aarch64-vuzp.ll
    M llvm/test/CodeGen/AArch64/complex-deinterleaving-f16-add-scalable.ll
    M llvm/test/CodeGen/AArch64/complex-deinterleaving-f16-mul-scalable.ll
    M llvm/test/CodeGen/AArch64/fixed-vector-deinterleave.ll
    M llvm/test/CodeGen/AArch64/neon-perm.ll
    M llvm/test/CodeGen/AArch64/sve-vector-deinterleave.ll

  Log Message:
  -----------
  [AArch64] Remove EXT instr before UZP when extracting elements from vector (#91328)

Assembly generated for getting odd/even elements from vector contained
extra EXT instruction. This was due to way llvm constructs DAGs when
vector_shuffling from larger type to smaller. This patch optimises DAG
in these situations, allowing for correct assembly to be emitted.



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