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Is the question related to microcontrollers or did you post in the wrong section?
In the former case, you would look for the instruction set description of your microcontroller first, does it support hardware multiply and division, and if so, which word length and what are the ececution times.
Generally speaking, add and sub are the same, multiply is slower and division much slower. Therefore, algorithm designer are trying to use multiply instead of division whereever possible.
I'm trying to use it for microcontrollers but that's good to know about instruction set, I'm looking for spatial computation microcontroller/processing for mapping and measuring/predicting based on heading, momentum, size, etc... the faster the better