In your own words, describe how does the ARM$9$ microprocessor achieve

an improvement in performance compared with the ARM$7$ microprocessor

for each of the three parameters;

$($i$)$ Ninst, the number of machine code instructions executed in the

program,

$($ii$)$ CPI, number of clock cycles per machine code instruction

$($iii$)$ fclk$,$ the clock frequency?

$9$

d$)$ In your own words, explain the terms $$semantic gap$$ and $$code density$.$