[PATCH] D65713: [TargetLowering][X86] Teach SimplifyDemandedVectorElts to replace the base vector of INSERT_SUBVECTOR with undef if none of the elements are demanded even if the node has other users.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

The SimplifyDemandedVectorElts function can replace with undef
when no elements are demanded, but due to how it interacts with
TargetLoweringOpts, it can only do this when the node has
no other users.

Remove a now unneeded DAG combine from the X86 backend.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D65713

Files:
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/masked_expandload.ll
  llvm/test/CodeGen/X86/x86-interleaved-access.ll

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