Question: What does common subexpression elimination achieve?
Options:
It reduces the number of variables
It eliminates duplicate calculations
It simplifies control flow
It increases the number of function calls
Correct Answer: It eliminates duplicate calculations
Solution:
Common subexpression elimination achieves the elimination of duplicate calculations, thus optimizing the code.
What does common subexpression elimination achieve?
Practice Questions
Q1
What does common subexpression elimination achieve?
It reduces the number of variables
It eliminates duplicate calculations
It simplifies control flow
It increases the number of function calls
Questions & Step-by-Step Solutions
What does common subexpression elimination achieve?
Step 1: Identify calculations in the code that are repeated multiple times.
Step 2: Replace the repeated calculations with a single variable that stores the result.
Step 3: Use this variable wherever the original calculation was used.
Step 4: This reduces the number of calculations the program has to perform.
Step 5: As a result, the code runs faster and is more efficient.
Common Subexpression Elimination – A compiler optimization technique that identifies and eliminates duplicate calculations of the same expression to improve efficiency.
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