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What does common subexpression elimination achieve?

Practice Questions

Q1
What does common subexpression elimination achieve?
  1. It reduces the number of variables
  2. It eliminates duplicate calculations
  3. It simplifies control flow
  4. 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.
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