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An index register contains an address that can be used during effective address generation, often along with an offset in the instruction or in another register. This is most useful when accessing elements of arrays or structures. A stack pointer is a specialized index register that points to a region of memory that can store temporary elements, in a last-in-first-out structure, such as return addresses, parameters, and local storage for function calls.

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Q: What is Difference between index register and stack pointer?
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