We present a new algorithm for VLSI placement. Our tool BonnPlace incorporates a partitioning-based legalization into a force-directed loop by iteratively pulling circuits towards their positions in a legalized placement. This self-stabilizing algorithm combines the accuracy of partitioning-based methods with the stability of force-directed placement strategies. Using information from earlier iterations, it is capable of improving netlength as well as more involved objective functions like routability and timing behavior. In contrast to previous techniques, we legalize with higher effort, which allows us to reduce the number of iterations. Performance is further improved by adapting a clustering heuristic that takes into account the current cell positions, both for clustering and unclustering. We tested our tool on recent instances from industry and on publicly available benchmark suites. In particular on the routability-driven placement instances of the DAC 2012 contest, our algorithm produces the best known results.
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