关键词: 单指令多数据流, 自动向量化, 数据依赖关系, 编译指示, 循环不变量, 向量寄存器

Abstract: Aiming at the problems that vectorization compiler tool can not perform auto-vectorization or does blind auto-vectorization because of the insufficient of program analysis ability, this paper proposes a vectorization method based on the compiler directive. The compiler directive is used to guide vectorization compiler tool to perform some special actions and produce high efficiency vectorization code automaticly when it is inserted into the program. Test results show that the method can effectively improve the performance of the object code.

Key words: Single Instruction Multiple Data(SIMD), automatic vectorization, data dependence relationship, compiler directive, loop invariant, vector register