Predicate dominatingEdge

Holds if (bb1, bb2) is an edge that dominates bb2, that is, all other predecessors of bb2 are dominated by bb2. This implies that bb1 is the immediate dominator of bb2.

This is a necessary and sufficient condition for an edge to dominate anything, and in particular dominatingEdge(bb1, bb2) and bb2.bbDominates(bb3) means that the edge (bb1, bb2) dominates bb3.