[PATCH] D104471: [llvm][sve] Lowering for VLS truncating stores

[David Truby via Phabricator via llvm-commits]

DavidTruby created this revision.
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This adds custom lowering for truncating stores when operating on
fixed length vectors in SVE. It also includes a DAG combine to
fold extends followed by truncating stores into non-truncating
stores in order to prevent this pattern appearing once truncating
stores are supported.

Currently truncating stores are not used in certain cases where
the size of the vector is larger than the target vector width.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104471

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-fixed-length-trunc-stores.ll

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