Developer builds x86-64 JIT compiler to run scalar loops directly in native machine code

A developer working on V.E.L.O.C.I.T.Y.-OS, a bare-metal operating system project, has detailed Part 6 of a 12-part build series focused on compiling scalar code directly into raw x86-64 machine instructions at runtime. The motivation was to eliminate closure dispatch overhead that slowed down simple scalar loops, even as vector operations were already outperforming native Rust. The implementation introduces a scalar detector that identifies eligible AST blocks and an x86-64 emitter that writes machine code bytes into executable memory pages. Variable slots are mapped directly to preserved CPU registers R12 through R15, with support capped at four scalar variables per compiled block. The broader project aims to build a self-healing OS running entirely within the CPU's L3 cache, with future parts covering classic compiler passes, Ring 0 kernel transition, and bare-metal driver development.