A Design Automation System for the RT level of design is described. The System explores the design space by finding alternative implementations for a user given behavioral specification. The alternative solutions are obtained by transformations on a graph model. These transformations effect trade-offs between the cost of the hardware and the speed of the algorithm. Heuristic routines are used to reduce the design space by exploring only those alternatives whose characteristics approach a user given set of goals.
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Barbacci et al. (1973) studied this question.