Suppose we have the following information about a code sequence: 1. The code sequence consists of two types of instructions type A and type B. 2. 25% of the instructions in the code are of type A and the rest are type B. 3. The CPI of type A is 4 and the CPI of type B is 1.33 1. Compute the overall CPI of the code sequence. 2. Assume an alternative design of the same ISA that tries to decrease the CPI of all type A instructions to 2.5. With the new design of the ISA what will be the overall CPI? Please note that the CPU is not changed. 3. Compare the performance of the old and the new design - which design is faster and by what factor.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Suppose we have the following information
about a code sequence:
1. The code sequence consists of two types of
instructions type A and type B.
2. 25% of the instructions in the code are of
type A and the rest are type B.
3. The CPI of type A is 4 and the CPI of type B is
1.33
1. Compute the overall CPI of the code
sequence.
2. Assume an alternative design of the
same ISA that tries to decrease the CPI
of all type A instructions to 2.5. With
the new design of the ISA what will be
the overall CPI? Please note that the
CPU is not changed.
3. Compare the performance of the old
and the new design - which design is
faster and by what factor.
Transcribed Image Text:Suppose we have the following information about a code sequence: 1. The code sequence consists of two types of instructions type A and type B. 2. 25% of the instructions in the code are of type A and the rest are type B. 3. The CPI of type A is 4 and the CPI of type B is 1.33 1. Compute the overall CPI of the code sequence. 2. Assume an alternative design of the same ISA that tries to decrease the CPI of all type A instructions to 2.5. With the new design of the ISA what will be the overall CPI? Please note that the CPU is not changed. 3. Compare the performance of the old and the new design - which design is faster and by what factor.
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