Q. 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