In compiler optimization, operator strength reduction uses mathematical identities to replace slow math operations with faster operations. Which of the following code replacements is an illustration of operator strength reduction?
A)Replace P + P by 2 * P or Replace 3 + 4 by 7.
B)Replace P * 32 by P

Question

In compiler optimization, operator strength reduction uses mathematical identities to replace slow math operations with faster operations. Which of the following code replacements is an illustration of operator strength reduction?
A)Replace P + P by 2 * P or Replace 3 + 4 by 7.
B)Replace P * 32 by P < < 5
C)Replace P * 0 by 0
D)Replace (P < <4) - P by P * 15

Quizplus · Accepted Answer

Operator strength reduction aims to replace slower operations with faster ones without changing the result. Multiplication by a constant (like 32) can be replaced with a left shift operation (P << 5), which is typically faster in many architectures.

In Compiler Optimization, Operator Strength Reduction Uses Mathematical Identities to Replace