Developer Replaces Division Ops with 16-bit Lookup Tables in Custom JIT Engine

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A developer building a bare-metal operating system called V.E.L.O.C.I.T.Y.-OS has published Part 5 of a 12-part series detailing low-level JIT compiler optimizations. Profiling revealed two key bottlenecks: variable lookup hashing via HashMaps and unoptimized packed-byte arithmetic. To address the first, a compile-time Variable Registry was introduced, replacing hash-based lookups with direct array index access for O(1) performance. The second optimization involved switching to a quaternary 2-bit format that packs eight elements per byte, enabling dot products to be computed entirely with bitwise operations and hardware popcounts instead of floating-point division. Together, these changes aim to close the performance gap between the custom JIT engine and native Rust compilation.

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ProgrammingDEV Community ·

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