Register Allocation in Compilers: A Deep Dive
2025-02-17
This article provides a clear explanation of the complexities of register allocation in compilers. Starting with a simple function example, it demonstrates how variables are mapped to registers and how stack space (spilling) is used when registers are insufficient. The article details two algorithms, linear scan and graph coloring, and explores additional challenges in real-world architectures, such as calling conventions and instruction set limitations. Even seemingly simple register allocation is fraught with optimization and trade-off challenges, making it a remarkably challenging aspect of compiler implementation.
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