[PATCH] D100882: [AArch64] Improve vector reverse lowering

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: RKSimon, fhahn, ABataev, sdesmalen.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.

This improves the lowering of v8i16 and v16i8 vector reverse shuffles. Instead of going via a generic tbl it uses a `rev64; ext` pair, as already happens for v4i32.


https://reviews.llvm.org/D100882

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/named-vector-shuffle-reverse-neon.ll
  llvm/test/CodeGen/AArch64/neon-reverseshuffle.patch

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