ITPEC FE Morning October 2019 Question 20
ITPEC FE Morning October 2019 — Question 20 of 80
Compiler Optimization — main purpose is to reduce program execution time.
Compiler optimization transforms intermediate code to produce faster or smaller machine code.
Techniques include:
- Dead code elimination
- Loop unrolling
- Constant folding
- Register allocation
Why not others:
- (a) Improve maintainability — optimization makes generated code harder to read, not easier
- (b) Make debugging easier — optimized code is harder to debug (variables may be eliminated)
- (d) Reduce time to generate object codes — optimization increases compilation time
Key rule: Compiler optimization = faster execution, not faster compilation.
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