What is the difference between "in-order" and "out-of-order" issue with respect to a processor's "scoreboard" or "reservation stations"?
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Incorrect.
The correct answer is A) Reservation stations or a scoreboard track operand availability for waiting instructions, allowing dispatch to execution units as soon as operands are ready, regardless of original program order — enabling out-of-order issue
Correct Answer
Reservation stations or a scoreboard track operand availability for waiting instructions, allowing dispatch to execution units as soon as operands are ready, regardless of original program order — enabling out-of-order issue
Mechanisms like Tomasulo's algorithm use reservation stations to buffer instructions until their source operands become available, allowing the processor to issue instructions to functional units out of program order while still respecting true data dependencies.