分簇VLIW DSP上支持单双字模式选择的SIMD编译优化  

SIMD compiler optimization by selecting single or double word mode for clustered VLIW DSP

作　　者：黄胜兵[1,2] 郑启龙[1,2] 郭连伟 

机构地区：[1]中国科学技术大学计算机科学与技术学院,合肥230027 [2]安徽省高性能计算重点实验室(中国科学技术大学),合肥230027

出　　处：《计算机应用》2015年第8期2371-2374,共4页journal of Computer Applications

基　　金：国家"核高基"重大专项(2012ZX01034-001-001)

摘　　要：BWDSP100是一款采用超长指令字(VLIW)和单指令多数据流(SIMD)架构的针对高性能计算领域而设计的32位静态标量数字信号处理器,其指令级并行(ILP)主要是通过其特殊的分簇体系结构和SIMD指令来实现,然而现有的编译框架无法对这些特殊的SIMD指令提供支持。由于BWDSP100拥有丰富的SIMD向量化资源,且其所运用的雷达数字信号处理领域对程序的性能要求极高,因此针对BWDSP100结构的特点,在传统Open64编译器中SIMD编译优化框架的基础上提出并实现了一种支持单双字模式选择的SIMD编译优化算法,通过该算法可以显著提高一些在DSP上有着广泛运用计算密集型程序的性能。实验结果表明,与优化前相比,该算法方案在BWDSP编译器上的实现能够平均取得5.66的加速比。BWDSP100 is a 32-bit static scalar Digital Signal Processor （DSP） with Very Long Instruction Word （VLIW） and Single Instruction Multiple Data （SIMD） features, which is designed for high-performance computing. Its Instruction Level Parallelism （ILP） is acquired though clustering and special SIMD instructions. However, the existing compiler framework can not provide support for these SIMD instructions. Since BWDSPIO0 has much SIMD vectorization resources and there are very high requirements in radar digital signal processing for the program performance, an SIMD optimization which surpported the selection of single or double word mode was put forward based on the traditional Open64 compiler according to the characteristics of BWDSP100 structure, and it can significantly improve the performance of some compute-intensive programs which are widely used in DSP field. The experimental results show that this algorithm can achieve speedup of 5.66 on average compared with before optimization.

关 键 词：编译优化 指令级并行 分簇体系数字信号处理器 超长指令字 单指令多数据流 Open64编译器 

分 类 号：TP311.54[自动化与计算机技术—计算机软件与理论]