基于间隔译码的处理器瞬时故障检测

同时冗余线程（SRT）重复的取指过程加剧了I-Cache和取指部件的负担，冗余线程间的取指冲突还会严重影响处理器的整体性能。在深入分析SRT故障检测机理和性能瓶颈的基础上，提出间隔译码的同时冗余线程（SD-SRT），特点如下：用统一取指队列和间隔译码技术取代间隔取指技术，在保持容错能力的前提下明确消除了冗余的取指过程，有效缓解了取指部件和I-Cache的压力，进而提高了整体性能；用统一的寄存器分配和验证机制，取代复杂的RC-Buf结构。实验表明，SD-SST比SRT性能提高20％以上，取指次数降低43％。此外，SD-SRT还显著降低了硬件设计的复杂度。

Detecting Transient Fault in Processors Via Slack-Decode

Simultaneously and Redundantly Threaded(SRT) demands a replicated fetch for almost all instructions,which not only increases pressures on I-Cache and fetch component,but also degrades the overall performance due to inter-thread conflicts.Having made an in-depth investigation of the mechanism and performance bottleneck of SRT,this paper propose Slack-Decode Simultaneously and Redundantly Threaded architecture (SD-SRT),which features the following improvements.First,a unified instruction-fetch-queue and a scheme called slack-decode substitute the slack-fetch scheme in SRT,to harmonize proceeding of redundant threads.Compared with SRT,SD-SRT definitely eliminates the redundant instruction fetches while retains the fault-tolerance capability,boosting the overall performance significantly.Second,a unified register renaming and checking scheme substitutes the complex register-check-buffer(RC-Buf).The simulations show SD-SRT outperforms SRT in terms of IPC by over 20%,while decreases I-Cache access by 43%.Meanwhile,SD-SRT decreases the hardware complexities.