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A survey on bit dimension optimization strategies of microprograms

机译:微程序的位尺寸优化策略研究

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摘要

Microprogram optimization is one way to increase efficiency, and optimization can be crucial in some applications. Optimization refers to a reduction of execution time of microprograms, or of the control store size, B × W, where W represents the word dimension of the control store which is the number of words of control store required for certain application, and B represents the bit dimension which is the number of bits per word of control store. The various optimization strategies can be broadly classified under four categories : bit dimension reduction, word dimension reduction, state reduction, and heuristic reduction. A survey of the various bit dimension optimization techniques has been presented by Agerwala in his 1976 paper, where the techniques are critically analyzed and compared, and the results of analysis are discussed. This paper further augments the work of Agerwala, taking into account the optimization methods developed later and hence not discussed by him. Also, the present study considers the optimization problem in the case of polyphase microinstructions in addition to that for monophase microinstructions. The prospective, current status, and future trends in this direction are also briefly outlined.

机译:

微程序优化是提高效率的一种方法,优化在某些应用程序中可能至关重要。优化是指减少微程序或控制存储区大小B×W的执行时间,其中W表示控制存储区的字长,它是某些应用程序所需的控制存储区的字数,B表示位尺寸,它是控制存储区每个字的位数。各种优化策略可以大致分为以下四类:位维缩减,字维缩减,状态缩减和启发式缩减。 Agerwala在1976年的论文中对各种位维优化技术进行了调查,对这些技术进行了严格的分析和比较,并讨论了分析结果。考虑到以后开发的优化方法,因此他没有对其进行讨论,因此本文进一步扩大了Agerwala的工作。此外,本研究还考虑了多相微指令的优化问题,以及单相微指令的优化问题。还将简要概述该方向上的预期,当前状态和未来趋势。

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