For the following data, what is the average number of cycles per instruction?

Operation Frequency Cycles

Arithmetic/logical operations 45% 1

Register load operations 18% 5

Register store operations 10% 2

Unconditional branch instructions 7% 1

Conditional branch instructions 20% 6

A) 3.65

B)2.82

C)1.87

D)2.10

2.82

Explanation:

The computation of the average number of cycles per instruction is shown below:

=  Arithmetic/logical operations × frequency cycles + Register load operations ×  frequency cycles  + Register store operations  ×  frequency cycles + Unconditional branch instructions ×  frequency cycles + Conditional branch instructions ×  frequency cycles

=  45% × 1 + 18% × 5 + 10% × 2 + 7% × 1 + 20% × 6

= 0.45 + 0.9 + 0.2+  0.07 + 1.2

= 2.82

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