[PATCH] D120879: [AArch64] Turn UZP1 with undef operand into truncate

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: sdesmalen, samtebbs, SjoerdMeijer, jaykang10.
Herald added subscribers: hiraditya, kristof.beyls.
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dmgreen requested review of this revision.
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This turns `upz1(x, undef)` to `concat(truncate(x), undef)`, as the truncate is simpler and can often be optimized away, and it helps some of the insert-subvector tests optimize more cleanly.


https://reviews.llvm.org/D120879

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/insert-subvector.ll
  llvm/test/CodeGen/AArch64/neon-perm.ll

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