What is the limitation on the number of registers (i.e., the user?visible register file) in a processor?
What will be an ideal response?
Once it was the availability of silicon. Today that is not usually a problem. The limitation is the number of bits required to specify a register address. If there are n registers, the number of bits required is m = log2n. If n = 8, then m = 3, if n = 16, then m = 4, … if n = 64, then m = 6. Suppose we have 64 registers in a machine with a 32? bit word. To support a register?to?register instruction set would require 3 × 6 = 18 address bits. That would
leave only 32 ? 18 = 14 bits for the op?code and any literal or other parameters.
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Which type of class represents real-world items?
A) entity B) interface C) abstract D) control
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At what levels should lab costs be broken down?
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