基于跳转轨迹的分支目标缓冲研究

发布时间：2018-06-04 14:02

本文选题：跳转轨迹 + 指令间隔　；参考：《计算机科学》2017年03期

【摘要】：现代计算机体系结构受两个方面的困扰:性能和能耗。为降低嵌入式处理器日益增长的功耗,提出基于跳转轨迹的分支目标缓冲结构(TG-BTB)。与传统分支目标缓冲每次提取指令时需要查询分支目标缓冲不同,TG-BTB只在执行轨迹预测为跳转时才查询分支目标缓冲。该结构通过在程序执行过程中动态分析跳转轨迹行为,可以实现只在轨迹跳转时查询分支目标缓冲,从而降低功耗。在动态分析过程中首先提取记录两条跳转分支指令之间的指令间隔,然后将提取的指令间隔存储在TG-BTB中,最后根据存储在TG-BTB中的指令间隔决定是否需要查询BTB。基于基准测试向量进行模型验证和性能测试,实验结果表明TG-BTB降低了81%的BTB查询能耗。
[Abstract]:Modern computer architecture is beset by two aspects: performance and energy consumption. In order to reduce the increasing power consumption of embedded processors, a branch target buffer structure based on jump trajectory is proposed. Unlike the traditional branch target buffer which needs to be queried each time the branch target buffer is extracted the branch target buffer is queried only when the execution trajectory prediction is a jump. By dynamically analyzing the jump trajectory behavior during the execution of the program, the structure can query the branch object buffer only when the trajectory jumps, thus reducing the power consumption. In the process of dynamic analysis, the instruction interval between two jump branch instructions is first extracted, then the extracted instruction interval is stored in the TG-BTB. Finally, according to the instruction interval stored in the TG-BTB, we decide whether or not we need to query the instruction interval. The model verification and performance test based on benchmark vector show that TG-BTB reduces the energy consumption of BTB query by 81%.
【作者单位】：同济大学电子与信息工程学院;同济大学微电子中心;
【分类号】：TP332

【相似文献】