1451     SchedDAGReverseDFS DFS;  in compute()  local
1453     DFS.follow(&SU);  in compute()
1456       while (DFS.getPred() != DFS.getPredEnd()) {  in compute()
1457         const SDep &PredDep = *DFS.getPred();  in compute()
1458         DFS.advance();  in compute()
1466           Impl.visitCrossEdge(PredDep, DFS.getCurr());  in compute()
1470         DFS.follow(PredDep.getSUnit());  in compute()
1473       const SUnit *Child = DFS.getCurr();  in compute()
1474       const SDep *PredDep = DFS.backtrack();  in compute()
1477         Impl.visitPostorderEdge(*PredDep, DFS.getCurr());  in compute()
1478       if (DFS.isComplete())  in compute()