Branch Prediction Accuracy

• Simulation Results on SPEC benchmark suit

  • Fixed 62.5%
  • Static, displacement based 68.5%
  • Dynamic, 1-bit 89%
  • Dynamic, 2-bit 93%

• Measured results from processor implementations (Table 8.11)

  • 1-bit prediction 60 - 70%
  • 2 bit prediction > 90%
  • 3 bit prediction 80 % (HP PA 8000)

• The trend all major processor families is to dynamic, multi-bit prediction (Figure 8.29)

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