Question: The subroutine-call instructions described in Chapter 2 always use the same generalpurpose register, LINK, to store the return address. Hence, the return register address is

The subroutine-call instructions described in Chapter 2 always use the same generalpurpose register, LINK, to store the return address. Hence, the return register address is not included in the instruction. However, the address LINK is included in bits IR3127 of subroutine-return instructions. Why are the two instructions treated differently?

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