[PATCH] D104217: [AArch64][SVE] Add support for fixed length MSCATTER/MGATHER

[Bradley Smith via Phabricator via llvm-commits]

bsmith created this revision.
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Since gather lowering can now lower to nodes that may need expansion via
the vector legalizer, do MGATHER lowering via vector legalizer.

As part of this, add a dag combine to optimize a SETCC_MERGE_ZERO of a
SETCC_MERGE_ZERO. This helps remove extra comparisons when generating
masks for fixed length masked operations.

Additionally, as part of adding passthru support for fixed typed
gathers, fix passthru support for scalable types.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104217

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-gather.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-loads.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-scatter.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-stores.ll
  llvm/test/CodeGen/AArch64/sve-masked-gather.ll

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