关键词: 代码优化, ARM内核, 流水线互锁, FFT, 浮点数

Abstract: With the development of the architecture of ARM，ARM processor can be used in many DSP applications.In order to thoroughly explore the ability of DSP in ARM processor，the high-efficient ARM program of radical 4-FFT is designed according to the architecture characters of ARM core.In the process of code designing，instruction scheduling and register allocation are controlled subtly and the fixed-point number’s storage format and computing method of float number are provided.Barrel shifter and 5-level pipeline are fully utilized and pipeline interlock is avoided.The experimental results indicate that the instruction cycles of optimized code are greatly shortened and the result is more precise.These methods of code optimization have practical meaning to optimization of ARM programs.

Key words: code optimization, ARM core, pipeline interlock, FFT, floating number