Suppose that a machine with a 5-stage pipeline uses branch prediction. 12% of the instructions for...
Suppose that a machine with a 5-stage pipeline uses branch prediction. 12% of the instructions for a given test program are branches, of which 84% are correctly predicted. The other 16% of the branches suffer a 4-cycle mis-prediction penalty. (In other words, when the branch predictor predicts incorrectly, there are four instructions in the pipeline that must be discarded.) Assuming there are no other stalls, develop a formula for the number of cycles it will take to complete n lines of this program
Homework Answers
If we ignored the branches completely, our program would take n + 4 cycles: One cycle per instruction, plus 4 more cycles to flush the pipeline at the end. 12% of the instructions are branches; however, 84% of those branches cause no delay. Thus, only 16% of 12% of n, or 1.92% of the instructions cause a 4-cycle delay. These delays cannot be overlapped,
therefore our formula is: n + 4 + 0.0192n ∗ 4 =0.0768n + 4.
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Suppose that a machine with a 5-stage pipeline uses branch
prediction. 12% of the instructions for...
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Suppose the branch frequencies are as follows: Conditional branches 15% Unconditional branches 1% Taken conditional branches...
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We implemented a new 5-stage pipeline with the following features: the delay by data and control...
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1. Suppose we have a 5-stage pipeline CPU and run the following instructions: or $tl, $t2, $t3 or...
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The classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem....
The classic five-stage pipeline MIPS architecture is used to
execute the code fragments in this problem. Assume the
followings:
The architecture fully supports forwarding,
Register write is done in the first half of the clock cycle;
register read is performed in the second half of the clock
cycle,
Branches are resolved in the third stage of the pipeline and
the architecture does not utilize any branch prediction
mechanism,
Register R4 is initially 100.
L1: lw R1,
0(R4)
add R3, R1, R2
sw ...
12 po Iw add Question 11 The dassic five-stage pipeline MIPS architecture is used to execute...
12 po Iw add Question 11 The dassic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem. Assume the followings: • The architecture fully supports forwarding • Register write is done in the first half of the clock cycles register read is performed in the second half of the clock cyde. Branches are resolved in the third stage of the pipeline and the architecture does not utilize any branch prediction mechanism Register R4 is initially...
The classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem....
The classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem. Assume the followings: • The architecture fully supports forwarding, • Register write is done in the first half of the clock cycle; register read is performed in the second half of the clock cycle, • Branches are resolved in the third stage of the pipeline and the architecture does not utilize any branch prediction mechanism, • Register R4 is initially 100. L1: lw add...
A program that executes 12.3x107 instructions is run on a pipelined processor. The table below provides...
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he classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem....
he classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem. Assume the followings: The architecture fully supports forwarding, • Register write is done in the first half of the clock cycle; register read is performed in the second half of the clock cycle, • Branches are resolved in the third stage of the pipeline and the architecture does not utilize any branch prediction mechanism, • Register R4 is initially 100. Ll: lw add SW...
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The classic five-stage pipeline MIPS architecture is used to
execute the code fragments in this problem. Assume the
followings:
The architecture fully supports forwarding,
Register write is done in the first half of the clock cycle;
register read is performed in the second half of the clock
cycle,
Branches are resolved in the third stage of the pipeline and
the architecture does not utilize any branch prediction
mechanism,
Register R4 is initially 100.
L1: lw R1,
0(R4)
add R3, R1, R2
sw ...
12 po Iw add Question 11 The dassic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem. Assume the followings: • The architecture fully supports forwarding • Register write is done in the first half of the clock cycles register read is performed in the second half of the clock cyde. Branches are resolved in the third stage of the pipeline and the architecture does not utilize any branch prediction mechanism Register R4 is initially...
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