4.15 The importance of having a good branch predictor depends on how often 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 BEQ JMP LW SW 40% 25% 5% 25% 5% Also, assume the following branch predictor accuracies: Always-Taken Always-Not-Taken 2-Bit 45% 55% 85% 4.15.1 [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 EX stage, that there are no data hazards, and that no delay slots are used.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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4.15 The importance of having a good branch predictor depends on how often
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
BEQ
JMP
LW
SW
40%
25%
5%
25%
5%
Also, assume the following branch predictor accuracies:
Always-Taken
Always-Not-Taken
2-Bit
45%
55%
85%
4.15.1 [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 EX stage, that there
are no data hazards, and that no delay slots are used.
Transcribed Image Text:4.15 The importance of having a good branch predictor depends on how often 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 BEQ JMP LW SW 40% 25% 5% 25% 5% Also, assume the following branch predictor accuracies: Always-Taken Always-Not-Taken 2-Bit 45% 55% 85% 4.15.1 [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 EX stage, that there are no data hazards, and that no delay slots are used.
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