[PATCH] D126449: [AArch64] Reuse larger DUP if available

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, samtebbs, jaykang10, sdesmalen.
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If both a `v2i32 DUP(x)` and a `v4i32 DUP(x)` node exists, we can re-use the larger node using a vector extract to obtain the smaller. This comes up in the smull/smlal code, but needs a small fixup to allow the smull2 code in tryExtendDUPToExtractHigh/performAddSubLongCombine to still match smull2 extracts.


https://reviews.llvm.org/D126449

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/aarch64-matrix-umull-smull.ll

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