[PATCH] D148309: [AArch64] Change the type of i64 neon shifts to v1i64

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: jaykang10, SjoerdMeijer, efriedma, bipmis.
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This alters the lowering of shifts by a constant, so that the type is lowered to a v1i64 instead of a i64. This helps communicate that the type will live in a neon register, and can help clean up surrounding code. Note this is only currently for the scalar shifts of a constant that go through the nodes in tryCombineShiftImm.

ssra instructions are no longer being recognized in places, but that can be cleaned up in a followup patch that combines the i64 add into a v1i64 add.


https://reviews.llvm.org/D148309

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/arm64-vshift.ll

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