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FPU

FPU： 　　(Float Point Unit，浮點運算單元)FPU是專用于浮點運算的處理器，以前的FPU是一種單獨芯片，在486之后，英特爾把FPU與集成在CPU之內(nèi)。 　　A floating point unit (FPU) is a part of a computer system specially designed to carry out operations on floating point numbers。 Typical operations are addition， subtraction， multiplication， division， and square root。 Some systems (particularly older， microcode-based architectures) can also perform various transcendental functions such as exponential or trigonometric calculations， though in most modern processors these are done with software library routines。

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