The Essentials ofComputer(computer) 468

The Essentials ofComputer(computer) 468 - 7 A RISC...

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7. A RISC processor has 186 total registers, with 18 globals. There are 12 register win- dows, each with 10 locals. How many input/output registers are in each register win- dow? 8. Suppose a RISC machine uses overlapping register windows for passing parameters between procedures. The machine has 298 registers. Each register window has 32 registers, of which 10 are global variables and 10 are local variables. Answer the fol- lowing: a) How many registers would be available for use by input parameters? b) How many registers would be available for use by output parameters? c) How many register windows would be available for use? d) By how much would the current window pointer (CWP) be incremented at each procedure call? 9. Recall our discussions from Chapter 8 regarding context switches. These occur when one process stops using the CPU and another process begins. In this sense, register windows could be viewed as a potential weakness of RISC. Explain why this is the case.
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