Thread: Why registers?

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    Devshed Newbie (0 - 499 posts)

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    Why registers?

    i am a newcomer to OS....

    Why do we need registers for storing function parameters when the primary memory already has the parameters?
    For eg:

    int sum(int a, int b) {}
    the values a and b are already available in the primary memory, then why should the general purpose register store them?

    Or is it that the CPU fetches the data from primary memory and puts them in the registers and then executes them?
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    Lost in code
    Devshed Supreme Being (6500+ posts)

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    Getting a value out of a register is like you getting milk out of your refrigerator, while getting a value out of memory is like you going to the store to buy a new carton of milk. You get the milk either way, but one method is a lot faster.

    Originally Posted by Spad
    Ah USB, the only rectangular connector where you have to make 3 attempts before you get it the right way around

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