A new cost model for high-level power optimization and its application

Optimizing power at high level needs less computational effort than that at lower levels and has significant effect as the designer con explore the design space from a global view point. Correct power cost model is essential to estimate during the optimizing process which design alternative consumes less power. We devise a new power cost model for each execution unit. It is based on the behavior of the cells contained in the execution unit. It is simple but more accurate than the conventional Hamming distance model. Applying it to operand interchange, we obtained significantly better results than Hamming distance model. We also propose an optimal algorithm for operand interchange