[PATCH] D149636: [AArch64] Combine concat through rshrn

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, samtebbs, jaykang10, bipmis.
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This tries to push the concat in `trunc(concat(rshr, rshr))` into the leaves, so that we can generate `rshrn(concat)`. This helps improve the codegen for small types, using the existing rshrn patterns.


https://reviews.llvm.org/D149636

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/neon-rshrn.ll

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