[PATCH] D134472: [DAG] Move one-use add of splat to base of scatter/gather

[Philip Reames via Phabricator via llvm-commits]

reames created this revision.
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This extends the uniform base transform used with scatter/gather to support one-use vector adds-of-splats with a non-zero base.  This has the effect of essentially reassociating an add from vector to scalar domain.

The motivation is to improve the lowering of scatter/gather operations fed by complex geps.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134472

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AArch64/sve-gather-scatter-addr-opts.ll
  llvm/test/CodeGen/RISCV/rvv/mscatter-combine.ll

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