关键词: 访问亲和度,结构体拆分,地址映射,SIMD向量化

Abstract: Sturcture is used more extensively to promote the performance of application program such as scientific computing.The noncontinuity and the nonalignment of its non-array memory address have a dramatic influence on the efficiency of program’s vectorization.To reduce the access to these addresses during the SIMD’s vectorization,this paper applied a structure peeling model based on the structure which combines field access affinity with type to eliminate the “clearance” of memory between field storage,and proposed an address conversion method of structure array one by one mapping to the two dimensional array to meet the request of the continuity and the alignment of its non-array memory address,further reducing the failure rate of Cache,so as to improve application performance.By using the test suites of gcc-vec,spec2000 and spec2006,the experimental results on the compiler of automatic vector show that using the me-thod,the performance of optimized programs can be improved by more than eight percent.

Key words: Access affinity,Structure peeling,Address mapping,SIMD vectorization