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Silicon area, performance, and testability have been, so far, the major design constraints to be met during the development of digital very-large-scale-integration (VLSI) systems. In recent years, however, things have changed; increasingly, power has been given weight comparable to the other design parameters. This is primarily due to the remarkable success of personal computing devices and wireless communication systems, which demand high-speed computations with low power consumption. In addition, there exists a strong pressure for manufacturers of high-end products to keep power under control, due to the increased costs of packaging and cooling this type of device. Last, the need of ensuring high circuit reliability has turned out to be more stringent. The availability of tools for the automatic design of low-power VLSI systems has thus become necessary. More specifically, following a natural trend, the …