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Algorithm Transformation to Improve Data Locality for Multimedia SOC

In this paper we propose a more systematic approach to improve data locality of multimedia algorithm that contain nested loop while still preserve the nested loop program semantic by algorithm transformation. We introduce procedure to evaluate the reuse vector of the data access. The reuse vectors represent the input dependencies of the program in the form of index vector which reveal the information of which loop carrying reuse and thus are used as a guide to select the loops subject to transformation. We use full search block matching motion estimation (FBME) algorithm as a case study because this algorithm has 6 level nested loop and thus is a good showcase of our method.