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 $R2,R0$

MOV $R3,R1$

MULS $R2,R0,R2$ ; $tobe$ compatible with Thumb$2$ format

MULS $R3,R1,R3$

ADD $R2,R2,R3$

$BXLR$

$1-$ 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:

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