os doubt

Question

Answer 1

i think 2 is minimum value

Explanation
assuming Ri as a seperate reg 
as given initially count=0
after 1) count=0 but Ri=1
after 2) count=4
after 3) count=1 
after 4) count=1 but Ri=2
after 5) count=5
after 6) count=2
Ans=2

Comments

What do they mean by the last three lines i.e the assumption part..how it is working..

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i mean the note part not the preemption ..

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@Arnabi. THis the sequence:

Tally1()

Tally2()

 

Now, Tally1() executes count = count + 1      4 times and before Tally1() writes back into the register, Tally2() loads 0 into its register. Now, after Tally1() writes back 4 into the register and after that Tally2() increments value and writes 1 into the register.

 

Now, let the tally1() reads 1 from register for its final increment instruction.

Now, after this, tally2() executes all its increment operations. So, final value in register is 5.

Now, tally1() increments value to 2 and writes back 2 into the register.

 

Hence, value 2.