Discussion
One of the following is not a program control instruction :
Answer: D
The one that is not a program control instruction is System-control instructions.
Program control (transfer of control) instructions change the sequence in which instructions are executed: unconditional and conditional branches, jumps, skips, subroutine calls and returns, and the instructions involved in interrupt handling, which save the state and transfer control to a service routine.
System-control instructions are a separate category in Stallings' classification of instruction types. They are privileged instructions, executable only in kernel mode, that read or alter control registers and protection settings, and their purpose is to manage the system rather than to alter program flow.
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