面向推断执行处理器的Trace压缩方法.pdfVIP

第 25 卷第 12 期 计算机辅助设计与图形学学报 Vo l. 25 No. 12 2013 年 12 月 lournal of Computer-Aided Design Computer Graphics Dec. 2013 面向推断执行处理器的 Trace 压缩方法 高瑛坷1·2〉，王 琪1·2〉，李泉泉13〉，张铁军I 〉，王东辉1 〉，侯朝映1) 1)(中国科学院声学研究所数字系统集成实验室 北京 100190) 2) (中国科学院大学 北京 100049) (gaoyingke@126. com) 摘 要:实时收集应用程序在处理器中的 trace 信息对于硅后验证和软件调试具有重要意义.受限于处理器片上存 储资源和通信带宽，为了提高 trace 信息的压缩效率以进行实时调试，提出一种面向推断执行处理器的实时 trace 压 缩方法.该方法充分利用推断位和程序计数器(PC) 的冗余特性，分别采用两级压缩后输出，保证了 PC 值的局部性和 整个 trace 信息的完整性.在 SuperV DSP 中进行验证的结果表明，文中方法比传统方法的压缩率平均提高 2 l. 95% ， 可以更好地满足推断执行处理器的实时调试需求. 关键词:推断执行;trace 压缩;SuperV 处理器 中图法分类号: TP368 A Trace Compression Approach for Predicative Execution Processor 2 1 1 1 Gao Yingk e1. ) , Wang Qi • 幻， Li Quanquanl.幻， Zhang Tiejunj} , Wang Donghui ) , and Hou Chaohuan ) 川 (Digital System Integration Laboratory , Institute of Acoustics , Chinese Academy of Sciences , Beijing 100190) 2) (University of Chinese Academy of Sciences , Beijing 100049) Abstract: Collecting the program execution traces in real time is essential to both the post-silicon verification and software debugging. Limited by on-chip storage resource and communication bandwidth supplied by processor , a trace compression approach is proposed for predicative execution processor in order to improving compression ratio. The predicative bits and program counters are compressed through two stages respectively by considering the redundant features of them so that the locality of PC and the integrity of whole trace are held. With SuperV DSP as the research prototype , in comparison with traditional approach , the average compression radio is increased by 2 1. 95 %. The real-time debugging requirements could be well met by adopting this approach.