IBM Power PC

• 601 -- 2-way issue; Slower but OOO

  • Branch unit, integer/load/store, f-p

• 620 -- 4-way issue; OOO

  • “Traditional” 5 stage pipeline
  • 2 integer ALU’s + 1 mult/div
  • 1 load/store unit
  • 1 FPU unit
  • 1 Branch unit (sophisticated) and branching based on CC’s
  • Misprediction penalty 2 or 3 cycles
  • See book (4.8) for more details. We’ll revisit after studying ooo execution

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