一种高能效双发射处理器的设计与实现

Design and Implementation of an Energy Efficient Dual-Issue Processor

为了提高高能效处理器的性能,基于ECore嵌入式处理器平台,在单反射按序流水线结构中引入两种轻量化的超标量结构——压缩指令双发射结构和选择性重命名结构。在Verilator生成的C++模型上进行的模拟实验结果表明,通过增加压缩指令双发射结构,流水线双发利用率平均值达到28%。通过增加选择性重命名结构,因名称冒险导致的流水线停顿占比从7.2%降至0.6%。相对于优化前,处理器的IPC提升4.8%,而功耗仅增加2.5%。

In order to improve performance with stable power consumption,based on ECore embedded processor platform,which had a single-issue in-order pipeline structure originally,two lightweight superscalar structures were introduced:selective register renaming and dual issue of compact instructions.The experimental data showed that the average utilization of dual-issue structure reached 28%by adding dual issue logic.Using selective register renaming,the average stalling rate caused by name hazard reduced from 7.2%to 0.6%.Compared with the original design,the IPC increased 4.8%and the power consumption only increased 2.5%.