Exercise $3$

Consider the following assembly subroutine called PowerofTwo that performs the operation $R_0^2+R_1^2$ and stores the result in $R_2.$

PowerofTwo: MOVS R$2,$R$0$

MOV R$3,$ R$1$

MULS R$2,$R$0,$R$2$ ; to be compatible with Thumb$2$ format

MULS R$3,$ R$1,$ R$3$

ADD R$2,$ R$2,$ R$3$

BX LR

$1-$ How many read and write from$/$to stack memory are done in the above subroutine?

$2-$ Design an assembly function, called MySubroutine, that calls the above function PowerofTwo a few times to compute the following numerical equation:

$4^2+{10}^2-6^2-7^4$