DEC (now Compaq) Alpha pipelines

• Alpha 21064 (2-way superscalar, in order) and Alpha 21164 (4-way)

• 21064

  • Ibox (Ifetch and decode: 4 cycles) common to:
  • Ebox (Integer execution unit: 3 stages)
  • Fbox (Floating-point execution unit: 6 stages)
  • Abox (load-store unit: 3 stages)

• Stalls can occur only in the first 4 stages.

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