Tomasulo’s solution: hazards

• Structural hazards

  • No free reservation station (stall at issue time)

• RAW hazard (detected in each functional unit --decentralized)

  • Stall at execution time

• No WAR and WAW hazards

  • Because of register renaming through reservation stations

• Forwarding

  • Done at end of execution by use of a common (broadcast) data bus

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