Question

Suppose the instruction set of the processor has only two registers. The code optimization allowed is code motion. What is the minimum number of spills to memory in the complied code? (A) 0 (B) 1 (C) 2 (D) 3

Name: Problem 4, Chapter 10: Computer Science and Information Technology
Uploaded: 2025-09-09T23:32:46-08:00
Duration: 1 min 42 s
Channel: James Kiss
Description: Suppose the instruction set of the processor has only two registers. The code optimization allowed is code motion. What is the minimum number of spills to memory in the complied code? (A) 0 (B) 1 (C) 2 (D) 3

   Suppose the instruction set of the processor has only two registers. The code optimization allowed is code motion. What is the minimum number of spills to memory in the complied code?
(A) 0
(B) 1
(C) 2
(D) 3

Computer Science and Information Technology

Trishna Knowledge… 2018 Edition

Chapter 10, Problem 4

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Solved by Expert James Kiss

09/09/2025

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We have only two registers available in the processor. Show more…

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Suppose the instruction set of the processor has only two registers. The code optimization allowed is code motion. What is the minimum number of spills to memory in the complied code? (A) 0 (B) 1 (C) 2 (D) 3

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Key Concepts

Register allocation is the process of mapping a program's variables to a limited number of CPU registers. Effective register allocation minimizes memory accesses and is crucial for achieving optimal performance in systems with a small number of registers.

Spilling

Spilling occurs when there are more active variables than available registers, causing some variables to be temporarily stored in memory. This process, while necessary, can degrade performance because accessing memory is slower than accessing registers.

Code Motion Optimization

Code motion is a compiler optimization technique that rearranges the sequence of instructions to improve performance and reduce redundant computations. By strategically moving code, compilers attempt to limit register pressure and thus decrease the number of necessary spills to memory.

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