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Improvement of Address Pointer Assignment in DSP Code Generation  

Lee, Hee-Jin (Division of Electronics and Information Engineering, Chonbuk National University)
Lee, Jong-Yeol (Division of Electronics and Information Engineering, Chonbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea CI / v.45, no.1, 2008 , pp. 37-47 More about this Journal
Abstract
Exploitation of address generation units which are typically provided in DSPs plays an important role in DSP code generation since that perform fast address computation in parallel to the central data path. Offset assignment is optimization of memory layout for program variables by taking advantage of the capabilities of address generation units, consists of memory layout generation and address pointer assignment steps. In this paper, we propose an effective address pointer assignment method to minimize the number of address calculation instructions in DSP code generation. The proposed approach reduces the time complexity of a conventional address pointer assignment algorithm with fixed memory layouts by using minimum cost-nodes breaking. In order to contract memory size and processing time, we employ a powerful pruning technique. Moreover our proposed approach improves the initial solution iteratively by changing the memory layout for each iteration because the memory layout affects the result of the address pointer assignment algorithm. We applied the proposed approach to about 3,000 sequences of the OffsetStone benchmarks to demonstrate the effectiveness of the our approach. Experimental results with benchmarks show an average improvement of 25.9% in the address codes over previous works.
Keywords
code generation; digital signal processors; offset assignment; address pointer assignment;
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