Question $4$: Program Logic Design and Implementation $(15$ minutes$)$

You are given a task to write an ARM assembly language program that emulates the following

logic:

Problem Statement: Implement a simple if$-$else structure to determine the greatest of three

integers. Assume the values are stored in registers r$0,$ r$1,$ and r$2.$ The program should:

$1.$ Compare the three values.

$2.$ Store the greatest value in register r$3.$

$3.$ Use conditional branching instructions such as BEQ, BNE, BLT$,$ BGT$,$ etc.

$4.$ If all three values are equal, output $0$ in r$3.$

$5.$ If there is a unique maximum value, output that value in r$3.$

Write the assembly code for this program with detailed comments explaining the purpose of each

line.

Question Analysis:

$$ Identify which comparisons are needed.

$$ Explain how conditional branching can control the flow.

$$ Consider edge cases $($all values equal or two values equal$).$

Question $5$: Instruction Set Analysis $(10$ minutes$)$

Consider the ARM assembly instruction ADDSEQ r$0,$ r$0,$ #$1.$ Answer the following questions:

$1.$ Explain what each part of the instruction means and how it affects the register values.

$2.$ Describe a scenario in which this instruction would be used.

$3.$ What condition must be true for this instruction to execute?

$4.$ Modify this instruction to increment r$1$ if the last subtraction resulted in zero, and explain

the changes.

Question Analysis:

$$ Requires understanding of suffixes $($EQ$,$ NE$,$ etc.$)$ and how condition codes work.