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14(10 points) In this problem we want to examine the accuracy of branch predictors for the...
This exercise examines the accuracy of various branch predictors for the following repeating pattern (e.g. in...
This exercise examines the accuracy of various branch predictors for the following repeating pattern (e.g. in a loop) of branch outcomes: T, T, T, NT, T, NT. a. What is the accuracy of always-taken and always-not-taken predictors for this sequence of branch outcomes? b. What is the accuracy of the two-bit predictor for the first five branches in this pattern, i.e. T, T, T, NT, T? Assume that the predictor starts off in the bottom left state from Figure 4.63...
Ch04.4. [6 points] Branch Prediction. Consider the following sequence of actual outcomes for a si...
Ch04.4. [6 points] Branch Prediction. Consider the following sequence of actual outcomes for a single static branch. T means the branch is taken. N means the branch is not taken. For this question, assume that this is the only branch in the program. TTTNTNTTTNTNTTTNTN Assume that we try to predict this sequence with a Branch History Table (BHT) using one-bit counters. The counters in the BHT are initialized to the N state. Which of the branches in this sequence would...
Question 15 Assume that an architecture uses 2-bit branch predictor and the predictor is initially set...
Question 15 Assume that an architecture uses 2-bit branch predictor and the predictor is initially set to WNT. For the following branch outcomes, indicate if each outcome is correctly predicted or not. In the table, T and NT represent Taken and Not-Taken branch outcomes, respectively. The states for 2-bit branch are ST (Strong-Taken), WT (Weak-Taken), WNT (Weak-Not-Taken), SNT (Strong-Not-Taken). Please use C for correct prediction and I for incorrect prediction. Branch Outcome T T T T T NT NT NT...
1. Suppose we have a 5-stage pipeline CPU and run the following instructions: or $tl, $t2, $t3 or...
1. Suppose we have a 5-stage pipeline CPU and run the following instructions: or $tl, $t2, $t3 or $t2, $tl, $t4 or $tl, $tl, $t2 1.1. What dependencies are there in the code? 1.2. Suppose there is no forwarding. What hazard may happen? Draw the pipeline diagram and insert stall (nop) to prevent these hazard. 1.3. If the pipeline has full forwarding. Are there still hazard? If so, draw the pipeline diagram and insert stall (nop) to prevent the hazard....
Assume that an architecture uses 2-bit branch predictor and the predictor is initially set to SNT....
Assume that an architecture uses 2-bit branch predictor and the predictor is initially set to SNT. For the following branch outcomes, indicate if each outcome is correctly predicted or not. In the table, T and NT represent Taken and Not-Taken branch outcomes, respectively. The states for 2-bit branch are ST (Strong-Taken), WT (Weak-Taken), WNT (Weak-Not-Taken), SNT (Strong-Not-Taken). Please use C for correct prediction and I for incorrect prediction. T т т т NT NT NT T T T T NT...
The following sequence of branch outcomes is applied to a saturating counter branch predictor T T...
The following sequence of branch outcomes is applied to a saturating counter branch predictor T T T N T T N N N T N N N T T T T N T T T N N T T T T N T If the branch penalty is two additional cycles for an incorrectly predicted branch, how many additional cycles does the system incur for the above sequence of 30 branches? Assume that the predictor is initially in the strongly...
This exercise examines the accuracy of various branch predictors for the following repeating pattern (e.g. in a loop) of branch outcomes: T, T, T, NT, T, NT. a. What is the accuracy of always-taken and always-not-taken predictors for this sequence of branch outcomes? b. What is the accuracy of the two-bit predictor for the first five branches in this pattern, i.e. T, T, T, NT, T? Assume that the predictor starts off in the bottom left state from Figure 4.63...
Ch04.4. [6 points] Branch Prediction. Consider the following sequence of actual outcomes for a single static branch. T means the branch is taken. N means the branch is not taken. For this question, assume that this is the only branch in the program. TTTNTNTTTNTNTTTNTN Assume that we try to predict this sequence with a Branch History Table (BHT) using one-bit counters. The counters in the BHT are initialized to the N state. Which of the branches in this sequence would...
Question 15 Assume that an architecture uses 2-bit branch predictor and the predictor is initially set to WNT. For the following branch outcomes, indicate if each outcome is correctly predicted or not. In the table, T and NT represent Taken and Not-Taken branch outcomes, respectively. The states for 2-bit branch are ST (Strong-Taken), WT (Weak-Taken), WNT (Weak-Not-Taken), SNT (Strong-Not-Taken). Please use C for correct prediction and I for incorrect prediction. Branch Outcome T T T T T NT NT NT...
1. Suppose we have a 5-stage pipeline CPU and run the following instructions: or $tl, $t2, $t3 or $t2, $tl, $t4 or $tl, $tl, $t2 1.1. What dependencies are there in the code? 1.2. Suppose there is no forwarding. What hazard may happen? Draw the pipeline diagram and insert stall (nop) to prevent these hazard. 1.3. If the pipeline has full forwarding. Are there still hazard? If so, draw the pipeline diagram and insert stall (nop) to prevent the hazard....
Assume that an architecture uses 2-bit branch predictor and the predictor is initially set to SNT. For the following branch outcomes, indicate if each outcome is correctly predicted or not. In the table, T and NT represent Taken and Not-Taken branch outcomes, respectively. The states for 2-bit branch are ST (Strong-Taken), WT (Weak-Taken), WNT (Weak-Not-Taken), SNT (Strong-Not-Taken). Please use C for correct prediction and I for incorrect prediction. T т т т NT NT NT T T T T NT...
The following sequence of branch outcomes is applied to a saturating counter branch predictor T T T N T T N N N T N N N T T T T N T T T N N T T T T N T If the branch penalty is two additional cycles for an incorrectly predicted branch, how many additional cycles does the system incur for the above sequence of 30 branches? Assume that the predictor is initially in the strongly...
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