CONCEPTS OF PROGRAMMING LANG.-TEXT
11th Edition
ISBN: 2810017678981
Author: Sebesta
Publisher: PEARSON
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Expert Solution & Answer
Chapter 6, Problem 1RQ
Explanation of Solution
Descriptor:
- The descriptor is nothing but collection of the attributes of a variable.
- It is an area of memory which stores the attributes of a variable in an implementation.
- If the attributes are all static, then the descriptors are required only at compile time. These descriptors are built by the compiler, usually as a part of the symbol table, and are used during compilation.
- For dynamic attributes, all of the descriptor must be maintained during execution. Here, the descriptor is used by the run-time system.
- Generally, it is used for type checking and building the code for the allocation and deallocation operations.
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Q.1. Architecture performance [10 marks]
Answer
A certain microprocessor requires either 2, 4, or 6 machine cycles to perform various operations.
⚫ (40+g+f)% require 2 machine cycles,
⚫ (30-g) % require 4 machine cycles, and
⚫ (30-f)% require 6 machine cycles.
(a) What is the average number of machine cycles per instruction for this microprocessor?
Answer
(b) What is the clock rate (machine cycles per second) required for this microprocessor to be a
"1000 MIPS" processor?
Answer
(c) Suppose that 35% of the instructions require retrieving an operand from memory which
needs an extra 8 machine cycles. What is the average number of machine cycles per
instruction, including the instructions that fetch operands from memory?
Chapter 6 Solutions
CONCEPTS OF PROGRAMMING LANG.-TEXT
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