Question

Which of the following invokes a function getReg(I)?

• A. Code optimization
• B. Code motion
• C. Code generation algorithm
• D. Intermediate code

Hint:

The getReg(I) function is invoked in code generation algorithms to efficiently allocate registers and optimize instruction execution.

Answer 1

The Correct Option is C

Step 1: Understanding the Function getReg(I) The function getReg(I) is typically used in code generation for selecting an appropriate register for an instruction \( I \).
Step 2: Role in Code Generation
- The code generation algorithm translates intermediate code into machine code.
- Register allocation and assignment are crucial in code generation to minimize memory access.
- getReg(I) helps assign registers efficiently to operands of an instruction.
Step 3: Evaluating options:
- (A) Incorrect: Code optimization improves performance but does not directly allocate registers.
- (B) Incorrect: Code motion moves instructions for efficiency but does not deal with register allocation.
- (C) Correct: The code generation algorithm invokes getReg(I) to handle register allocation.
- (D) Incorrect: Intermediate code is a high-level representation and does not manage hardware registers directly.