Question $3$

The Cortex MO$+$ Thumb assembly subroutine below, named Exp, is used to compute the expression $A^B($ A power of $B)$ where A and $B$ are two integer values which are allocated to registers $rO$ and $r1$ respectively and the result is stored in register $r2.$

Note; As a reminder, all Cortex Mo$+$ instructions take one clock cycle, except unconditionat Branch instructions and conditional branch instruction if they are TRUE which take two clock cycles

Questions:

$1-[5$ Marks$]$ How many CPU clock cycles would it take for the subroutine to be executed to compute the expression $0^{17}?$

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Total number of clock cycles $=q,$ Cycles

$2-[5$ Marks$]$ Same question as above in order to compute the maximal value of $)=(2,$ without causing an overflow.

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Note: First, you need to find the value of A$,$ before determining the number of clock cycles.

Total number of clock cycles $=q,$ Cycles