[PATCH] D42133: [AArch64] Improve code generation of vector mask build

[Evandro Menezes via Phabricator via llvm-commits]

evandro created this revision.
evandro added reviewers: fhahn, sdesmalen.
Herald added subscribers: hiraditya, kristof.beyls, javed.absar, rengolin.

Instead of using, for example, `mov w0, #0xffff; dup v0.4s, w0`, which transfers between register files, use the more efficient `movi v0.4s, #-1` instead.


Repository:
  rL LLVM

https://reviews.llvm.org/D42133

Files:
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/test/CodeGen/AArch64/build-one-lane.ll

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