The article explores how GCC lowers switch statements into efficient jump tables at compile time. It demonstrates with code examples that GCC can handle both compact case ranges and offset-by-constant case values, generating optimal jump-table assembly. Bitset lowering is noted as GCC-specific, while other optimizations translate to clang.
Background
This is part of a blog series on compiler internals by Xoranth, examining how GCC transforms high-level control flow constructs into efficient machine code via optimization passes.
- Source
- Lobsters
- Published
- Oct 31, 2026 at 04:00 AM
- Score
- 5.0 / 10