$12\mathrm{.}12$ Zylab $1-$ ALU and Data Transfer Instructions

Given an array of $2$ integers, write a program to implement the following C code that appends elements to the array:

$//$ Declaration of variables

int$*$ A; $//$ Integer array A with the base address pointing to variable A

int a; char b$,$ c; short d;

$//$ Append array elements

$\{$ A$[3],$ A$[2]\}=$ A$[1]*$ A$[0]$;

A$[4]=$ A$[2]/230$;

a $=$ A$[2]\%230$;

b $=$ a $>>16$; $//\text{'}>>\text{'}=$ right shift

c $=$ a & $8$; $//\text{'}$&$\text{'}=$ bit$-$wise and

d $=$ a $<<2$; $//\text{'}<<\text{'}=$ left shift

A$[5]=\{$b$,$ c$,$ d$\}$; $//\{\}=$ concatenation

Registers Variables

$s$0$ A

Addresses Contents

$s$0$ A$[0]$

$s$0+4$ A$[1]$

You may use any temporary registers from $t$0$ to $t$9$ or saved registers from $s$1$ to $s$7.$ Clearly specify your choice of registers and explain your code using comments $(5$ points$).$

Example Test: If the values of $s$1$ through $s$7$ are initialized in the simulator as:

Registers Data

$s$04000$

Addresses Contents

$40004$

$40045$

the resultant array is:

Addresses Contents

$40004$

$40045$

$400820$

$40120$

$40160$

$402080$

Note: Use the $\text{'}+\text{'}$ button under the Registers display to initialize register values for $s$0$ and the $\text{'}+\text{'}$ button under the Memory display to initialize the first two array elements.