SIMD指令函数包，对速度有要求的朋友赶快下，里面有FFT函数，比普通指令要快接近4倍。可用在GPS的数据密集运算中，可以达到实时运行。-SIMD instruction function, package, asked a friend of the speed quickly, the inside FFT function, than the average close to 4 times faster instruction. Can be used in GPS, data-inte