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[Kanalia]

Yep, just like Japo said, FPUs (or "math coprocessors") that are outside of the main CPU's die are a thing of the past. Since the times when Intel Pentium Pro/Pentium II processors reigned over the desktop highlands, FPUs sit inside the main CPU.

If you REALLY need to specifically do something on the FPU, you'd have to resort to some kind of specific math library for C/C++ or resort to x86 assembler code. Other then that, the compiler does the job for ya, just like Kippesoep said.