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English, 05.03.2021 22:50 valenzueladomipay09u
4.16 Th is exercise examines the accuracy of various branch predictors for the
following repeating pattern (e. g., in a loop) of branch outcomes: T, NT, T, T, NT
4.16.1 [5] <§4.8> What is the accuracy of always-taken and always-not-taken
predictors for this sequence of branch outcomes?
4.16.2 [5] <§4.8> What is the accuracy of the two-bit predictor for the fi rst 4
branches in this pattern, assuming that the predictor starts off in the bottom left
state from Figure 4.63 (predict not taken)?
4.16.3 [10] <§4.8> What is the accuracy of the two-bit predictor if this pattern is
repeated forever?
4.16.4 [30] <§4.8> Design a predictor that would achieve a perfect accuracy if
this pattern is repeated forever. You predictor should be a sequential circuit with
one output that provides a prediction (1 for taken, 0 for not taken) and no inputs
other than the clock and the control signal that indicates that the instruction is a
conditional branch.
4.16.5 [10] <§4.8> What is the accuracy of your predictor from 4.16.4 if it is
given a repeating pattern that is the exact opposite of this one?
4.16.6 [20] <§4.8> Repeat 4.16.4, but now your predictor should be able to
eventually (aft er a warm-up period during which it can make wrong predictions)
start perfectly predicting both this pattern and its opposite. Your predictor should
have an input that tells it what the real outcome was. Hint: this input lets your
predictor determine which of the two repeating patterns it is given
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4.16 Th is exercise examines the accuracy of various branch predictors for the
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