[PATCH] D123222: [DAGCombiner][SVE] Ensure MGATHER/MSCATTER addressing mode combines preserve index scaling

[Paul Walker via Phabricator via llvm-commits]

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refineUniformBase and selectGatherScatterAddrMode both attempt the
transformation:

  base(0) + index(A+splat(B)) => base(B) + index(A)

However, this is only safe when index is not implicitly scaled.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123222

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-gather-scatter-addr-opts.ll

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