Finalizing Pipelined Execution- Retirement and Write-Back
Retiring means removal from the scheduler with or without the commitment of operation results, whichever is appropriate.
- Retiring an operation does not imply the results of the operation are either permanent or non permanent.
A result is made permanent:
- either by making the mapping of architectural to physical register permanent (if no separate physical registers exist) or
- by copying the result value from the rename register to the architectural register ( in case of separate physical and architectural registers)in an own write-back stage after the commitment!