More than 2 bits

• Performance studies show it’s not worthwhile

• 2 bits scheme used in:

  • Alpha 21164
  • UltraSparc
  • Pentium
  • Power PC 604 and 620 with variations
  • MIPS R10000

• PA-8000 uses a variation

  • Majority of the last 3 outcomes (no need to update; just a shift register)

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