[PATCH] D138883: [SelectionDAG][PowerPC] Memset reuse vector element for tail store

[Ting Wang via Phabricator via llvm-commits]

tingwang created this revision.
tingwang added reviewers: shchenz, nemanjai, rzurob, PowerPC.
tingwang added a project: LLVM.
Herald added subscribers: kbarton, hiraditya.
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tingwang requested review of this revision.
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On PPC there are instructions to store element from vector(e.g. stxsdx/stxsiwx), and these instructions can be leveraged to avoid tail constant in memset.

This patch tries to add callback in SDAG to allow the reuse.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D138883

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.h
  llvm/test/CodeGen/PowerPC/memset-tail.ll

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