1392     SchedDAGReverseDFS DFS;  in compute()  local
1394     DFS.follow(&SU);  in compute()
1397       while (DFS.getPred() != DFS.getPredEnd()) {  in compute()
1398         const SDep &PredDep = *DFS.getPred();  in compute()
1399         DFS.advance();  in compute()
1407           Impl.visitCrossEdge(PredDep, DFS.getCurr());  in compute()
1411         DFS.follow(PredDep.getSUnit());  in compute()
1414       const SUnit *Child = DFS.getCurr();  in compute()
1415       const SDep *PredDep = DFS.backtrack();  in compute()
1418         Impl.visitPostorderEdge(*PredDep, DFS.getCurr());  in compute()
1419       if (DFS.isComplete())  in compute()