说明：  许多现代浮点单元的一项主要体系结构功能,是能够将一个乘法与后面紧跟的加法作为单个运算执行,且没有中间舍入误差,例如,In
(One of the main architectural functions of many modern floating-point units is the ability to perform a multiplication with the following addition as a single operation without intermediate rounding errors, for example, In)