Question 9776 – Machine-Instructions
December 17, 2023Question 13130 – Computer-Networks
December 18, 2023Question 9626 – Machine-Instructions
Consider the following assembly language program for a hypothetical processor. A, B, and C are 8 bit registers. The meanings of various instructions are shown as comments.
MOV B, # 0 ; B ← 0 MOV C, # 8 ; C ← 8 Z : CMP C, # 0 ; compare C with 0 JZX ; jump to X if zero flag is set SUB C, # 1 ; C ← C - 1 RRC A, # 1 ; right rotate A through carry by one bit. Thus: ; if the initial values of A and the carry flag are a7...a0 and ; c0 respectively, their values after the execution of this ; instruction will be c0a7...a1 and a0 respectively. JC Y ; jump to Y if carry flag is set JMP Z ; jump to Z Y : ADD B, # 1 ; B ← B + 1 JMP Z ; jump to Z X :
If the initial value of register A is A0 the value of register B after the program execution will be
Correct Answer: B
Question 3 Explanation:
B is to be increments when a is moved to carry.
The code is counting the number of 1 bits in A0.
The code is counting the number of 1 bits in A0.
the number of 0 bits in A0
the number of 1 bits in A0
A0
8
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