Computers and Technology, 05.05.2020 16:40 loveoneonly4379
4.28 The importance of having a good branch predictor depends on how o en conditional branches are executed. Together with branch predictor accuracy, this will determine how much time is spent stalling due to mispredicted branches. In this exercise, assume that the breakdown of dynamic instructions into various instruction categories is as follows:
R-Type
CBZ/CBNZ
B
LDUR
STUR
40%
25%
5%
25%
5%
Also, assume the following branch predictor accuracies:
Always-Taken
Always-Not-Taken
2-Bit
45%
55%
85%
4.28.1 [10] <§4.8> Stall cycles due to mispredicted branches increase the CPI. What is the extra CPI due to mispredicted branches with the always-taken predictor? Assume that branch outcomes are determined in the ID stage and applied in the EX stage that there are no data hazards, and that no delay slots are used.
4.28.2 [10] <§4.8> Repeat 4.28.1 for the "always-not-taken" predictor.
4.28.3 [10] <§4.8> Repeat 4.28.1 for the 2-bit predictor.
4.28.4 [10] <§4.8> With the 2-bit predictor, what speedup would be achieved if we could convert half of the branch instructions to some ALU instruction? Assume that correctly and incorrectly predicted instructions have the same chance of being replaced.
4.28.5 [10] <§4.8> With the 2-bit predictor, what speedup would be achieved if we could convert half of the branch instructions in a way that replaced each branch instruction with two ALU instructions? Assume that correctly and incorrectly predicted instructions have the same chance of being replaced.
4.28.6 [10] <§4.8> Some branch instructions are much more predictable than others. If we know that 80% of all executed branch instructions are easy-to-predict loop-back branches that are always predicted correctly, what is the accuracy of the 2-bit predictor on the remaining 20% of the branch instructions?
Answers: 1
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Computers and Technology, 23.06.2019 09:00, vetterk1400
Design a class tictactoe that: holds the following information about the game: two-dimensional array (3 by 3), and winner. add additional variables as needed. includes the functions to perform the various operations on objects. for example, function to print the board, getting the move, checking if move is valid, determining if there is a winner after each move. add additional operations as needed. includes constructor(s). write the functions of the class, and write a program that uses the class. the program should declare an object of type tictactoe. the program will create the board and store it in the array. the program will allow two players to play the tic-tac-toe game. after every valid move update the array, check if there is a winner. if there is no winner and no tie, then print the board again to continue.
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Computers and Technology, 23.06.2019 17:00, evanwall91
What does the faves button do? a. users mark a web page as a favorite b. leads other readers to favor a specific page c. readers sort and align their favicons, or favorite icons d. leads users to a message board where they can post questions
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