what is stack pointer?

Generated on 8/8/2024

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The stack pointer is a register that keeps track of the top of the stack in memory. In the context of function calls, it is used to manage the call frame, which is the memory allocated for a function's local variables and state. When a function is called, memory is allocated on the stack by subtracting from the stack pointer. This allocated memory is known as the call frame. When the function returns, the stack pointer is adjusted back to deallocate the memory.

For more details, you can refer to the session Explore Swift performance at timestamp 07:38.