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Instruction folding in Java processor

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8 Author(s)
Lee-Ren Ton ; Dept. of Comput. Sci. & Inf. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Lung-Chung Chang ; Min-Fu Kao ; Han-Min Tseng
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Traditionally, the performance of a stack machine was limited by the true data dependency. A performance enhancement mechanism-Stack Operations Folding-was used in Sun Microelectronics' picoJava design and it can reduce up to 60% of all stack operations. In this paper, we use the Java bytecode language as the target machine language, and study its instruction folding on a proposed machine model. Three folding strategies: 2-foldable, 3-foldable and 4-foldable, were simulated and evaluated. Statistical data show that our third folding strategy eliminates 73% of all stack operations, and each strategy has an overall program speedup of 1.19, 1.25 and 1.26, respectively, as compared to a traditional stack machine. Moreover, a Java machine model suitable for instruction folding, together with its pipeline stages, are presented. It seems to have the best cost/performance effectiveness of a Java stack machine if six bytes decoder width and the second folding strategy-the three-foldable strategy-are adopted

Published in:

Parallel and Distributed Systems, 1997. Proceedings., 1997 International Conference on

Date of Conference:

10-13 Dec 1997

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