Subroutine call and return instructions

In computer organization, subroutine call and return instructions are essential components for structuring and organizing program logic. Subroutines are sections of code that perform a specific task and are designed to be reusable. By using subroutine call and return instructions, a program can efficiently call these sections of code as needed and return control to the main program after execution.

1. Subroutine Call Instruction:
   - The subroutine call instruction is used to transfer control from the main program to a specific subroutine.
   - It typically involves specifying the address or label of the subroutine in the instruction.
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