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Better quality automatic layout of integrated circuits can be obtained by combining the placement and routing phases so that routing is used as the cost function for placement optimization. Conventional routers are too slow to make this feasible, and so this paper presents a parallel decomposition and implementation of an integrated circuit global router. The LocusRoute router is divided into three orthogonal “axes” of parallelism: routing several wires at once, routing segments of a wire in parallel, and dividing up the potential routes of a segment among different processors to be evaluated. The implementation of two of these approaches achieve significant speedup - wire-by-wire parallelism attains speedups from 6.9 to 13.6 using sixteen processors, and route-by-route achieves up to 4.6 using eight processors. When combined, these approaches can potentially provide speedups of as much as 55 times.

The parallel decomposition and implementation of an integrated circuit global router