lib/CodeGen/MachineScheduler.cpp

330 bool ScheduleDAGMI::canAddEdge(SUnit *SuccSU, SUnit *PredSU) {
331   return SuccSU == &ExitSU || !Topo.IsReachable(PredSU, SuccSU);
384 /// FIXME: Adjust PredSU height based on MinLatency.
386   SUnit *PredSU = PredEdge->getSUnit();
389     --PredSU->WeakSuccsLeft;
391       NextClusterPred = PredSU;
395   if (PredSU->NumSuccsLeft == 0) {
397     PredSU->dump(this);
402   --PredSU->NumSuccsLeft;
403   if (PredSU->NumSuccsLeft == 0 && PredSU != &EntrySU)
404     SchedImpl->releaseBottomNode(PredSU);