As a result , your code will actually use a mixture of both x87 and sse sse2 for floating - point computations 因此,您的代码实际上将混合使用x87和sse / sse2来进行浮点计算。
Sse and sse2 instructions will be used for some scalar floating - point computations , when it is determined that it is faster to use the sse sse2 instructions and registers rather than the x87 floating - point register stack 时,优化程序将选择何时以及如何使用sse和sse2指令。当确定使用sse / sse2指令和寄存器肯定要比使用x87浮点寄存器堆栈更快时, sse和sse2指令将用于某些标量浮点计算。