Advantages/Benefits of Unreachable Code Elimination

• Performance Improvement: The compiler reduces pointless computations and instructions, which improves program performance by removing unreachable code. Dead code should be removed because it makes the program work less and completes operations more quickly.
• Reduced Memory Usage: The compiled program uses memory to store unreachable code. So if we eliminate this unreachable code, then the memory usage is minimized and we can use the memory for other computations. In some systems, the memory is limited for the operations, so unreachable code elimination is more useful for these systems.
• Improved Readability and Maintainability: Removing inaccessible code makes the codebase easier to read and maintain. The program is simpler to comprehend and modify because developers can concentrate on pertinent code.
• Optimization of Resource Utilisation: By eliminating unreachable code, less computation, and memory usage is required, which leads to optimized resource use. When aiming for devices with low processing power or memory, or in resource-constrained systems, this optimization is especially beneficial.

Unreachable Code is also known as dead code in Compiler Design that points to the portion of a program that is never executed under any condition or scenario. This dead code doesn’t do any functionality in the program but unnecessarily occupies the space in the application memory, and also due to this there are different problems of unnecessary computation, that describe the program’s performance. So, to avoid this issue in Compiler Design, we can use the technique of Unreachable Code Elimination. In this Compiler Design article, we will see Unreachable Code Elimination with its techniques, practical examples, and advantages.