Chapter 9, Problem 6E

Explanation of Solution

Explanation:

The total number of registers present in the Central Processing Unit (CPU) is 152.

The number of global registers for different functions is 12.

The number of register windows is 10.

The number of input parameter registers is 6.

The number of output parameter registers is 6.

The total number of local registers can be calculated using the following formula,

$\begin{array}{c}\text{Total}\text{number}\text{of}\text{local}\text{registers}\text{=}\text{(total}\text{registers}-\text{(global}\text{registers}\text{+}\\ \text{(register}\text{windows}\text{×}\text{common}\text{registers)))}\end{array}$

Substitute, “152” for “ total registers”, “12” for “global registers”, “10” for “register windows” and “6” for “common registers”  in the above formula,

$\begin{array}{c}\text{Total}\text{number}\text{of}\text{local}\text{registers}\text{=}(152-(12+(10\text{×}6\text{)))}\\ \text{=}\text{80}\end{array}$

Thus, the total number of local registers is 80