面向64位RISC-V的基础数学库自动化移植  

Automatic Porting of Basic Mathematics Library for 64-bit RISC-V

作　　者：曹浩 郭绍忠[1] 刘聃 许瑾晨[1] CAO Hao;GUO Shao-zhong;LIU Dan;XU Jin-chen(State Key Laboratory of Mathematical Engineering and Advanced Computing,PLA Information Engineering University,Zhengzhou 450002,China)

机构地区：[1]数学工程与先进计算国家重点实验室(信息工程大学),郑州450002

出　　处：《计算机科学》2021年第6期41-47,共7页Computer Science

基　　金：国家自然科学基金(61802434)。

摘　　要：受制于核心技术和知识产权等客观条件,国产自主芯片的研发困难重重。RISC-V作为一个开源指令集架构(ISA),具有简洁、模块化等优点,成为了国产处理器的新选择。基础数学库作为计算机系统最基础的核心软件库之一,对国产处理器的软件生态建设和健康发展尤为重要,而目前RISC-V还没有相关的基础数学库。因此,文中旨在将基于国产申威处理器的基础数学库移植到64位RISC-V平台。为了解决基础数学库的高效移植问题,首先设计了一个自动化移植框架,该框架通过功能模块间的松耦合,来实现高可扩展性;然后根据64位RISC-V指令集架构的特点,提出了基于全局的主动式寄存器分配方法和基于层次的指令选择策略;最后应用该框架,实现了对申威平台基础数学库中典型函数的移植,测试结果表明移植后函数功能正确且相对于GLIBC库在性能上有一定的提升。Subject to the core technology and intellectual property rights and other objective conditions,the research and development of domestic independent chip is highly restricted.RISC-V has the advantages of simplicity and modularity as an open source instruction set architecture(ISA),and it will become a new choice of domestic processor.As one of the most basic core software libraries of computer system,basic mathematics library is particularly important to the software ecological construction and healthy development of domestic processors.However,RISC-V has no relevant basic mathematics library at present.Therefore,this paper aims at porting basic mathematics library based on domestic Shenwei processor to the 64-bit RISC-V platform.In order to solve the problem of efficient transportation of the library,an automatic porting framework is designed at first,which can achieve high scalability through loose coupling between functional modules.Secondly,based on the characteristics of 64-bit RISC-V ISA,a global active register allocation method and a hierarchical instruction selection strategy are proposed.Finally,the framework is applied to bring about the transportation of some typical functions in the Shenwei basic mathematics library.Test results show that the ported functions are working correctly and the performance is improved compared with GLIBC.

关 键 词：RISC-V 基础数学库 汇编 自动化移植 

分 类 号：TP313[自动化与计算机技术—计算机软件与理论]