基于程序特征分析的流处理器VLIW压缩技术与解压实现

代码体积和代码稀疏是VLIW处理器一直存在的问题.通过对一系列典型应用在流处理器上的程序特征进行分析,提出了一种新的VLIW分域压缩技术,剔除各个子域中的空操作,并设计了分布式指令存储器对压缩后的代码进行解压缩执行.实验证明,该技术能够减少MASA流处理器中近39％的片外指令访存,降低约65％的片上指令存储器空间需求；同时使得指令存储器面积和系统面积分别减少了约37％和8.9％.

Program characteristics analysis-based VLIW compression and decompression on stream processor

Huge code cubage and poor code density have always been a serious problem in VLIW processors.Through analyzing the code characteristics of a series of typical applications on stream processor,a novel domain-divided VLIW code compression scheme to eliminate the nop operations in each domain,and a distributed instruction memory to decompress and execute of the codes are proposed.The experiments show that this scheme can reduce nearly 39% of the off-chip instruction memory accessing and about 65% of the on-chip instruction memory space demand.Meanwhile,it can also depress the area of on-chip instruction memory and MASA stream processor by 37% and 8.9% respectively.