A processor uses a 2?bit saturation?counter dynamic branch predictor with the states strongly taken, weakly taken, weakly not taken, and strongly not taken. The symbol T indicates a branch that is taken and an N indicates a branch that is not taken. Suppose that the following predicted sequence of branches is recorded: T T T N T X What is the value of X?
What will be an ideal response?
In order to make the N prediction, the previous two states would have to be not taken states. If the next
prediction is T then the previous branch must have been T to move from the weakly not taken predicted state to
the weakly predicted taken state. Therefore the next prediction X will be T.
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