摘要： 为充分利用嵌入式多核ARM微处理器体积小、功耗低、成本低、性能高的优点,以此提高程序响应速度,研究ARM体系结构及基于该体系结构基础函数的优化问题。基于ARM Cortex-A72平台,结合ARM v8体系结构特点,对Bionic库中字符串和内存处理函数进行分析。实验结果表明,采用整字处理、循环展开、特殊指令等技术进行程序级优化后,Bionic库中常用基础函数的性能在ARM Cortex-A72平台上均有不同程度的提升。

关键词: 多核ARM, 体系结构, 整字处理, 循环展开, 特殊指令

Abstract: In order to make full use of the advantages of embedded multi-core ARM microprocessor,such as small size,low power consumption,low cost and high performance to improve the system speed,this paper studies the architecture of ARM and the optimization problem of basic function based on the architecture.It analyzes the string and memory processing functions in Bionic library based on the structural characteristics of ARM v8 on the ARM Cortex-A72 platform.Experimental results show that after program level optimization of whole word processing,loop unrolling and special instruction optimization techniques,the performance of commonly used base functions in the Bionic library is improved to varying degrees on the ARM Cortex-A72 platform.

Key words: multi-core ARM, architecture, whole word processing, loop unrolling, special instruction

中图分类号: 

• TP316