Overengineered calculator: Zig + QBE

A hands-on walkthrough of building a native-code-compiling arithmetic expression evaluator using Zig and QBE compiler backend. Covers all stages: defining a grammar with EBNF, implementing a tokenizer as a state machine, building a recursive descent parser to produce an AST, writing a direct AST interpreter, emitting QBE SSA intermediate language, and finally invoking QBE and zig cc to produce a native executable. Includes concrete code examples for each stage and observations about QBE's constant folding optimization.

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