TOMASULO : CONCLUSIONS

• Yields improved performance through

  $\rightarrow$

  reduced latency via forwarding

  $\rightarrow$

  reduced stalls due to structural, WAR and WAW hazards

• Substantial hardware cost
  • Associative lookup needed for tag matching
  • For every register and reservation station
  • Tag matching must be very fast

• Performance could be improved by duplicating the CDB, but would need to do double tag matching at every register and reservation station