Consider three different processors P1, P2, and P3 executing the same instructio

Question

Consider three different processors P1, P2, and P3 executing the same instruction set with the clock rates and CPI given in the following table. 1. [2] Which Processor has the highest performance? 2. [2] If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions. B. [4] Write a procedure called ReturnSmaller that accepts two numbers, compares those two numbers and returns the smaller one. C. Represent -1.5 in Binary 1. [2] IEEE-754 Single precision representation 2. [2] IEEE-754 double precision representation

Explanation / Answer

A)
1)

Performance = 1/ (execution time)
We know execution time = CPI * C
   where CPI = Cycles per instruction
       C = clock rate

P1 = execution time = 1.5 * (1/2 GHz) = 1.5 * 0.5 * 10^-9 = 0.75 * 10^-9 seconds
P2 = execution time = 1      * (1/1.5 GHz) = 1 * 0.6 * 10^-9 = 0.6 * 10^-9 seconds
P3 = execution time = 3   * (1/2.5 Ghz) = 3 * 0.4 * 10^-9 = 1.2 * 10^-9 seconds

Therefore Performance of Processor P2 is the highest

B)

SMALLER :
   move $t1,$a1
   move $t2,$a2
   bl $t1,$t2,SKIP
   move $v1,$t2
jal $ra
   SKIP:
   move $v1,$t1
jal $ra

C.
   Decimal representation is -1.5 :-

   SINGLE PRECISION BINARY REPRESENTATION :- 1 0111111 110000000000000000000000
   DOUBLE PRECISION BINARY REPRESENTATION :- 1 01111111111 1000000000000000000000000000000000000000000000000000

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