[llvm-dev] Optimizing diamond pattern in DAGCombine

[Amaury SECHET via llvm-dev]

I'm trying to optimize a pattern that goes roughly as:
    A
   / \
  B   C
   \ /
    D

Problem is, when A gets modified, B and C get added back to the worklist,
but D doesn't. Readding D to the worklist just create an infinite loop
where one process D again and again.

Is there a proper way to make this work ?
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