In some cases, FPUs may be specialized, and divided between simpler floating-point operations (mainly addition and multiplication) and more complicated operations, like division. In some cases, only the simple operations may be implemented in hardware and/or microcode, while the more complex operations are implemented as machine code routines (i.e. written in assembly language or a compiled high level language).
In some current architectures, the FPU functionality is combined with units to perform SIMD computation; an example of this is the replacement of the x87 instructions set with SSE instruction set in the x86-64 architecture used in newer Intel and AMD processors.
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