Abstract: EPIC technology is applied not only to the designs of general-purpose CPU, but also to application specification instruction set processors (ASIPs) in application specific domain. But its high performance is at a cost of sharp expansion of EPIC program code. To solve it, this paper presents a new encoding method——dynamic variable-length encoding. Tests indicate that the method can achieves an average static code compression ratio of 62.8% in speech algorithm of low encoding code.

Key words: Explicitly parallel instruction computing (EPIC), ASIPs, Instruction encoding, Dynamic variable-length

摘要： EPIC技术不仅广泛应用于通用CPU的设计中，而且它还被应用于专用领域的专用指令集处理器(ASIPs)的设计中。目前使用的EPIC技术的性能提高是以程序代码量的急剧膨胀为代价的。为了减少EPIC程序代码长度，该文提出了一种新的指令编码方法——动态变长指令编码方法。测试结果表明，对于低编码率的语音编解码领域的ASIPs，动态变长指令编码方法可以将代码的压缩率提高到62.8%。

关键词: 显示并行指令计算, 专用指令集处理器, 指令编码, 动态变长