使用verilog写的32位浮点数加法模块、浮点数乘法模块、浮点数除法模块、浮点数指数模块。指数模块是综合前面三个例化成泰勒级数求指数，迭代次数（可设置）决定了精度。-Use verilog write 32-bit floating-point addition module, floating-point multiplication module, floating-point division module, the floating point number index module.Index module is a comprehensive index of the front three cases into Taylor series for calculating index, the number of iterations can be set to determine the precision