This paper proposes a new algorithm for Instruction implementation hfethod Selection Problem (IMSP) in ASIP (Application Specific Integrated Processors) design automation.This problem is to be solved in the instruction set architecture and CPU core architecture designs. First, the IhUP is formalized as an integer programming problem, which is to maximize the performance of the CPU under the constraints of chip area and power consumption. Then, a branch-andbound algorithm to solve IMSP is described. According to the experimental results, the proposed algorithm is quite effective and eficient in solving the IMSP. This algorithm will autom,ate the complex parts of the ASIP chip design.
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