You are evaluating three branch prediction strategies: (1) predict always taken,

(2) predict always not taken and (3) use the 2-bit branch predictor. Experimentally, your

measurements show that conditional branches account for 20% of all instructions and

70% of all branches are taken. The 2-bit predictor has an accuracy of 70%. Assuming

that the penalty of a misprediction is 4 cycles and 0 cycles for a correct prediction,

compute the average stall cycles per instruction of the three strategies.