Clock 5: Execution of instruction B(Update of Reorder buffer)

Reorder Buffer

| Status | Dst | Value

0 | Finished_InValid | 8 | 25

1 | Finished_Valid | 8 | 55

2 | Issued_Valid | 9 | 0

3 | Issued_Valid | 10 | 0

4 | Empty | 0 | 0

Head =>

<=Tail

instr a

instr b

instr c

instr d

Also need to retire Instruction A. Since status of instruction A is Finished_Invalid, do not write to register file.

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