Anatomy of a compiler

  • front-end: parse text into AST, generate HIR
  • middle-end: MIR, opt/analysis
  • back-end: literally just LLVM


Mid-level Intermediate Representation - mid-level refers to the back-end stage of the compiler. MIR is the desugaring of complex code into simpler code. By having simpler code, optimizers will only have to deal with a part of the language, becoming more efficient at their job. Tl;Dr: desugar complex code into simpler code which is easier to optimize.

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