GCC Lowers Your Switch Statement Three Different Ways: Bitsets, Jump Tables, and a Probability-Balanced Tree
A switch statement is not a branching instruction. It is a small optimization problem that you hand to the compiler: here is a set of integer values, here is what each value should do, now figure out the cheapest machine code that respects the semantics. GCC treats that problem seriously enough to…
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- 2026-10-31 17:48 · DEV Community — AI
GCC Lowers Your Switch Statement Three Different Ways: Bitsets, Jump Tables, and a Probability-Balanced Tree