[PATCH] D84866: [AArch64][GlobalISel] Selection support for vector DUP[X]lane instructions

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
aemerson added a reviewer: paquette.
aemerson added a project: LLVM.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.
aemerson requested review of this revision.

In future, we'd like to use the perfect-shuffle mechanism to deal with these shuffle permutations. For now, this improves performance by avoidind the super-expensive const-pool load + tbl instruction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84866

Files:
  llvm/include/llvm/CodeGen/GlobalISel/Utils.h
  llvm/lib/CodeGen/GlobalISel/Utils.cpp
  llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
  llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerCombiner.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/select-shuffle-to-duplane.mir
  llvm/test/CodeGen/AArch64/GlobalISel/select-shuffle-vector.mir

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