Abstract: There are two ways to get vector program,one is handwritten,and the other is generated automatically by the compiler.Limited to programmers and parallel compiler’ ability,there always is some optimization space in vector program.The optimizing compiler concernes most about how to transform the serial program into vector form,rarely do further optimization after the vector form generating.We proposed a memory access optimization method for vector program of SIMD form.Firstly it determines that whether the program needs to be optimized.If optimization is needed,redundancy optimization and align optimization will be implemented for the vector form program.Experimental data show that the proposed method can significantly improve the running efficiency of the program,and the goal is achieved.

Key words: Vectorization,Single instruction multiple data,Memory access redundant,Alignment optimization