It is shown that coherent optimization strategies for multilevel synthesis should rely on a good link between the factorization, the technology mapping and the netlist optimization. Factorization options are shown to play a key role. The technology mapping should optimize both area and critical path and only netlist structure preserving optimization techniques (buffer insertion, gate replication) should be applied first. Only in a last step resynthesis of critical areas based on a local view is applied. The approach has been experimented on set of large combinational benchmarks.
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