llvm dev - May 2020 - Question about SUnits in a ScheduleDAG

Hello,

While trying to move upwards in a DAG using the Preds vector of a SUnit, I
encountered a situation where;

Given a SUnit A, and a successor B. SUnit A was not in the vector Preds of B,
even though B was in Succs of A.


I'm curious as to why this could be. Have I misinterpret the use of Succs
and Preds?

/Erik
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