Question

Which technique replaces a sequence of instructions with a faster one?

• A. Syntax Analysis
• B. Code Expansion
• C. Peephole Optimization
• D. Parsing

Hint:

Peephole Optimization performs:
• Redundant instruction elimination
• Strength reduction
• Constant folding
• Flow-of-control optimization

Answer 1

The Correct Option is C

Concept: Optimization techniques improve program efficiency without changing program behavior. Peephole optimization examines a small window of consecutive instructions and replaces inefficient instruction sequences with more efficient ones.

Step 1: Understand peephole optimization.
The compiler looks through a small "peephole" of instructions. It identifies redundant or inefficient code patterns.

Step 2: Apply replacement.
Example: \[ MOV\;R1,R1 \] does nothing and can be removed. Similarly, multiple instructions may be replaced with a single faster instruction.

Step 3: Determine the answer.
Therefore the technique that replaces instruction sequences with faster ones is \[ \boxed{\text{Peephole Optimization}} \]