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if you want to do fpu, decide which type you want, risc/cisc. if you want to risc, then you just focus on floating point add/sub/mul/divide, or maybe reciporcal or squar root.
but if you want cisc just like 80387, you have to learn more , for example , sin, cos, tan, arc tan, etc.
I think floating point arithmetic is not easy , you can check IEEE paper , there are hundreds on it.
i think i want to design a risc floating point architecture..now my question is how to go about framing the architecture??now that addition , subtraction , multiplication , division , square root are the operations that i want to perform..should my next type be choosing the type of adder & multiplier??