Engineering a Compiler (3rd Edition) by Keith Cooper and Linda Torczon is widely regarded as one of the definitive textbooks for computer science students and professionals specializing in programming language implementation. As compiler technology advances, this book provides a modern, practical approach to building compilers, focusing on techniques used in state-of-the-art systems.

Engineering a Compiler breaks down the compilation process into a series of distinct phases, categorizing them into the front end, the middle end (optimizer), and the back end.

Choosing which target machine instructions best represent the operations in the IR.

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Updated discussions on infrastructure like LLVM that decouple front-end parsing from back-end code generation. The Role of GitHub in Compiler Engineering

This is the most critical section to understand.