APlace is a high quality, scalable analytical placer. This paper describes our recent efforts to improve APlace for speed and scalability. We explore various wirelength and density approximation functions. We speed up the placer using a hybrid usage of wirelength and density approximaions during he course of multi-level placement, and obtain 2-2.5 imes speedup of global placement on the IBM ISPD04 and ISPD05 benchmarks. Recent applications of the APlace framework to supply voltage degradation-aware placement and lens aberration-aware timing-driven placement are also briefly described.
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