Tournament/Meta predictor (McFarling ’93)

• Often happens that a predictor is better for some branches and another for other branches

• A bimodal predictor can then be used to drive a mux that will choose between the 2 predictors

• When the outcome is known the metapredictor is updated if one of the predictors was right and the other wrong

• In this case the states are the confidence on the 2 predictors

Author: Roberto Innocente