Abstract: FFT algorithm has a wide range of applications in computer science. Adaptive FI门software package with its excellent portability has been interested by many researchers and users. I_oongson 3A is developed by institute of compuling technology, Chinese academy of sciences. It is a quad-core CPU and compatible with MIPS instructions using RISC architecture. The article focused on three types of FFT adaptive libraries which are FFTW，UHFFTand SPIRAI.Firstly, we compared the difference between FFTW and UHFFT from two aspects of search framework and code generator. Then we elaborated SPIRAL's three layers schema which is used to produce optimized code automatically.Furthermore, we evaluated these libraries on the Loonson 3A platform and analyzed the results. Finally, we concluded the general method of current FIST adaptive software packages and provided a guideline for further development of adaptive FFT software package.

Key words: FFTW,UHFFT,SPIRAL,Loongson 3A,FFT