Exercise

$4\mathrm{.}19\mathrm{.}3$: $[5].$

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Consider the following instruction mix:

$($a$)$

What fraction of all instructions use data memory?

$($b$)$

What fraction of all instructions use instruction memory?

$($c$)$

What fraction of all instructions use the sign extend?

$($d$)$

What is the sign extend doing during cycles in which its output is not needed?