Question

Which ONE of the following techniques used in compiler code optimization uses live variable analysis?

• A. Run-time function call management
• B. Register assignment to variables
• C. Strength reduction
• D. Constant folding

Hint:

Live variable analysis helps optimize the usage of registers by identifying variables that are still in use and need to be preserved.

Answer 1

The Correct Option is B

Live variable analysis is used to determine which variables hold values that may be used in the future.
It is especially useful for register allocation, where variables that are "live" (i.e., needed later) must be preserved in registers.
Strength reduction and constant folding do not directly involve live variable analysis; they are optimizations based on algebraic transformations or constant expressions.
Thus, the correct answer is \( \boxed{B} \).