Q. What does common subexpression elimination achieve?
-
A.
It reduces the number of variables
-
B.
It eliminates duplicate calculations
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C.
It simplifies control flow
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D.
It increases the number of function calls
Solution
Common subexpression elimination achieves the elimination of duplicate calculations, thus optimizing the code.
Correct Answer:
B
— It eliminates duplicate calculations
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Q. What does dead code elimination refer to?
-
A.
Removing code that is never executed
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B.
Optimizing loops
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C.
Reducing variable declarations
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D.
Simplifying expressions
Solution
Dead code elimination refers to removing code that is never executed, which can help reduce the size of the code.
Correct Answer:
A
— Removing code that is never executed
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Q. What does the term 'register allocation' refer to in code generation?
-
A.
Assigning variables to CPU registers
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B.
Allocating memory for dynamic variables
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C.
Managing stack space for function calls
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D.
Distributing tasks among multiple processors
Solution
Register allocation refers to the process of assigning variables to CPU registers to optimize access speed.
Correct Answer:
A
— Assigning variables to CPU registers
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Q. What is loop unrolling?
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A.
A technique to increase the number of iterations in a loop
-
B.
A method to reduce the overhead of loop control
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C.
A way to eliminate loops entirely
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D.
A technique to optimize recursive functions
Solution
Loop unrolling is a method to reduce the overhead of loop control by increasing the number of operations performed in each iteration.
Correct Answer:
B
— A method to reduce the overhead of loop control
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Q. What is the main challenge of optimizing code for different architectures?
-
A.
Different programming languages
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B.
Varying instruction sets and performance characteristics
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C.
Inconsistent coding standards
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D.
Lack of documentation
Solution
The main challenge of optimizing code for different architectures is the varying instruction sets and performance characteristics.
Correct Answer:
B
— Varying instruction sets and performance characteristics
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Q. What is the primary goal of code optimization?
-
A.
To increase the size of the code
-
B.
To improve the execution speed of the code
-
C.
To make the code more readable
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D.
To reduce the number of comments in the code
Solution
The primary goal of code optimization is to improve the execution speed of the code.
Correct Answer:
B
— To improve the execution speed of the code
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Q. What is the purpose of constant folding in code optimization?
-
A.
To replace variables with their constant values
-
B.
To eliminate unnecessary function calls
-
C.
To simplify control flow
-
D.
To optimize memory allocation
Solution
Constant folding is used to replace variables with their constant values at compile time, reducing runtime calculations.
Correct Answer:
A
— To replace variables with their constant values
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Q. What is the purpose of register allocation in code generation?
-
A.
To minimize the use of memory
-
B.
To assign variables to CPU registers
-
C.
To optimize the execution speed of loops
-
D.
To eliminate redundant calculations
Solution
The purpose of register allocation in code generation is to assign variables to CPU registers to improve execution speed.
Correct Answer:
B
— To assign variables to CPU registers
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Q. What is the role of a peephole optimizer?
-
A.
To optimize entire functions
-
B.
To analyze the entire program
-
C.
To make local optimizations on small sections of code
-
D.
To generate intermediate code
Solution
A peephole optimizer makes local optimizations on small sections of code, often focusing on improving performance in a limited scope.
Correct Answer:
C
— To make local optimizations on small sections of code
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Q. Which of the following is a common technique used in code optimization?
-
A.
Inlining functions
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B.
Adding more comments
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C.
Increasing variable scope
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D.
Using more complex data structures
Solution
Inlining functions is a common technique used in code optimization to reduce function call overhead.
Correct Answer:
A
— Inlining functions
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Q. Which of the following is NOT a benefit of code optimization?
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A.
Improved performance
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B.
Reduced memory usage
-
C.
Increased code complexity
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D.
Faster execution time
Solution
Increased code complexity is NOT a benefit of code optimization; optimizations aim to maintain or reduce complexity.
Correct Answer:
C
— Increased code complexity
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Q. Which optimization technique can help reduce the number of memory accesses?
-
A.
Loop fusion
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B.
Function inlining
-
C.
Dead code elimination
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D.
Code hoisting
Solution
Loop fusion can help reduce the number of memory accesses by combining multiple loops that iterate over the same data.
Correct Answer:
A
— Loop fusion
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Q. Which optimization technique can lead to a trade-off between speed and memory usage?
-
A.
Function inlining
-
B.
Loop fusion
-
C.
Code hoisting
-
D.
Strength reduction
Solution
Function inlining can lead to a trade-off between speed and memory usage, as it increases code size but can reduce function call overhead.
Correct Answer:
A
— Function inlining
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Q. Which optimization technique focuses on reducing the number of instructions executed?
-
A.
Loop unrolling
-
B.
Constant folding
-
C.
Common subexpression elimination
-
D.
Code motion
Solution
Constant folding focuses on reducing the number of instructions executed by evaluating constant expressions at compile time.
Correct Answer:
B
— Constant folding
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