[PATCH] D41515: [AArch64] Improve code generation of vector build

[Evandro Menezes via Phabricator via llvm-commits]

evandro created this revision.
evandro added reviewers: sdesmalen, t.p.northover.
Herald added subscribers: hiraditya, kristof.beyls, javed.absar, rengolin, aemerson.

Instead of using, for example, `dup v0.4s, wzr`, which transfers between register files, use the more efficient `movi v0.4s, #0` instead.


Repository:
  rL LLVM

https://reviews.llvm.org/D41515

Files:
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/test/CodeGen/AArch64/arm64-build-vector.ll
  llvm/test/CodeGen/AArch64/arm64-vector-insertion.ll
  llvm/test/CodeGen/AArch64/build-one-lane.ll

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