The x87 FPU data registers (shown in Figure 8-1) consist of eight 80-bit registers. Values are stored in these registers in the double extended-precision floating-point format shown in Figure 4-3. When floating-point, integer, or
packed BCD integer values are loaded from memory into any of the x87 FPU data registers, the values are automatically converted into double extended-precision floating-point format (if they are not already in that format).

【 在 BigCarrot 的大作中提到: 】
: 他们没有用sse时有问题，用了sse就好了
: 其实用x87时使用指定的精度保存数据，运算时可能采用80b，理论上结果可能会更加精确
: sse使用相同的精度来保存和计算
: ...................
--
FROM 14.21.238.*