Instructor note:

Hint:

Use "add", "jal" instructions in the main assembly. Do not use $"$lw$","$sw$"$ instructions.

Notice that when the Sum$()$ and Dif$()$ functions are called, the arguments are flipped: $($x$,$ y$)$ and $($y$,$ x$)$

Given the following C program and the mapping of registers to variables, complete the MIPS implementation of Main. Do not implement return $0$; in main$().$

int Dif$($int a$,$ int b$)\{$

return a $-$ b;

$\}$

int Sum$($int a$,$ int b$)\{$

return a $+$ b;

$\}$

int main$()\{$

int x$,$ y;

w $=$ Sum$($x$,$ y$)$;

z $=$ Dif$($y$,$ x$)$;

return $0$; $//$ Do not implement

$\}$

Registers Variables

$s$0$ x

$s$1$ y

$s$2$ w

$s$3$ z

Hint: Use a$0,$ a$1$ as arguments and v$0$ as return value, according to the register conventions.

Ex: If the values of $s$0$ and $s$1$ are initialized in the simulator as:

Registers Data

$s$05$

$s$110$

the results are stored in $s$2$ and $s$3$:

Registers Data

$s$05$

$s$110$

$s$215$

$s$35$

Note: Use the $\text{'}+\text{'}$ button under the Registers display to initialize register values for $s$0$ and $s$1.$

Assembly Code:

Main:

# Type your code here.

j End

# Procedure Sum $($Do not modify$)$

Sum:

add $v$0,$ $a$0,$ $a$1$

jr $ra

# Procedure Dif $($Do not modify$)$

Dif:

sub $v$0,$ $a$0,$ $a$1$

jr $ra

End:

$-----$

Registers:

$s$0$: $0$

$s$1$: $0$

$-------$

Please provide the correct answer by using the assembly code I provided and any adjustments to the registers provided as well $($ as shown in the screenshot$)$