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Malte UblandClaude Opus 5.5
8c8ee28413
Every box pointer of a captured binding is a value live from its binding to its last use. A factory whose methods share thousands of bindings hands LLVM thousands of such ranges, each crossing every call in between, in the factory and in each method that receives them, and the inliner, instruction selection and register allocation grow quadratically: Bun's large-environment AOT program (8,701 captured bindings) spent about three minutes in native code generation. A function holding at least 512 capture boxes (the self-hosted compiler's largest holds under 100) is now emitted `noinline optnone`, and its box slots are loaded and stored volatile so no IR pass promotes them, which the native helper's pipeline would otherwise still do for optnone bodies. Each use reloads its box pointer from the frame. Boxes, environments and semantics are unchanged; only those bodies' machine code is unoptimized. large-environment.ts now compiles in 16 s instead of 227 s (peak RSS 543 MB instead of 777 MB) and runs in the same 0.18 s. Corpus 5973 pins such a factory's behavior (shared mutation, per-iteration closures, a nested closure, a forward-captured read in its TDZ), and a harness test bounds compile-time growth between 500 and 4,000 bindings. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>