Combining breadth-first with depth-first search algorithms for VLSI wire routing

A breadth-first search (BFS) algorithm usually needs less time but consumes more computer memory space than a depth-first search (DFS) algorithm to find the shortest path between two nodes. This paper attempts to combine BFS with DFS algorithms to find all shortest paths in the VLSI (Very Large Integration Circuits) wire routing. BFS is used to compute the shortest distance between every position and the start one. DFS is used to traverse all shortest paths in the course of backtracking from the end position to the start one. The effectiveness of the method is proved by the theoretical analysis and the experiment results.