[PATCH] D48666: [ScheduleDAG] Fix unfolding of SUnits to already existent nodes.

[Nirav Dave via Phabricator via llvm-commits]

niravd created this revision.
niravd added reviewers: davide, eli.friedman, fhahn, bogner.
Herald added subscribers: hiraditya, MatzeB.

If unfolding an SUnit results in both load or the operation using it which
already exist in the DAG, abort the unfold if they are already scheduled.
If not, make sure we don't add duplicate dependencies.

This fixes PR37916.


Repository:
  rL LLVM

https://reviews.llvm.org/D48666

Files:
  llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
  llvm/test/CodeGen/X86/pr37916.ll

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