[PATCH] D123414: [AArch64] Break up larger shuffle-masks into legal sizes in getShuffleCost

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, labrinea, samtebbs, jaykang10.
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Given a larger-than-legal shuffle mask, the final codegen will split into multiple sub-vectors. This attempts to model that in AArch64TTIImpl::getShuffleCost, splitting masks up according to the size of the legalized vectors. If the sub-masks have at most 2 input sources we can call getShuffleCost on them and sum the costs, to get a more accurate final cost for the entire shuffle. The call to improveShuffleKindFromMask helps to improve the shuffle kind for the sub-mask cost call.


https://reviews.llvm.org/D123414

Files:
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/AArch64/shuffle-other.ll

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