计算机科学 ›› 2017, Vol. 44 ›› Issue (5): 14-19.doi: 10.11896/j.issn.1002-137X.2017.05.003
丁丽丽,李雁冰,张素平,王鹏翔,张庆花
DING Li-li, LI Yan-bing, ZHANG Su-ping, WANG Peng-xiang and ZHANG Qing-hua
摘要： GCC编译器是一种受广大研究者青睐的开源优化编译器,但它仅仅能够对完美嵌套循环进行依赖分析。为了更好地挖掘嵌套循环粗粒度的并行,深入研究了GCC5.1数据依赖分析过程,提出了一种能够处理分支嵌套循环的依赖测试方法。首先识别出分支嵌套循环,然后分析数组下标与分支嵌套循环外层索引变量的关系,最后计算出外层循环索引变量的距离向量,并通过检测距离向量判断循环是否存在依赖。实验结果表明,该方法能够正确、有效地分析出分支嵌套循环的依赖关系。
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