Chunk 16.2

This chunk focuses on integrating the Pre-Compiled Constraint Evaluator (PCE) into the actual proof pipeline after establishing the foundational `cuzk-pce` crate. The assistant initially explored adding a dedicated synthesis function directly to `bellperson`'s `supraseal.rs`, but quickly pivoted to a cleaner architecture: keeping the PCE logic entirely within `cuzk-core` and `cuzk-pce`. The key insight was constructing `ProvingAssignment` objects directly from the PCE's MatVec output via a new `from_pce` constructor, feeding them into the existing `prove_from_assignments()` function without modifying `bellperson`'s core synthesis interface. The implementation involved several coordinated changes across the workspace. In `cuzk-core/pipeline.rs`, a new `synthesize_auto` function was created as the unified synthesis entry point, backed by a PCE cache. All six existing synthesis call sites (PoRep, WinningPoSt, WindowPoSt, SnapDeals) were updated to use `synthesize_auto` instead of `synthesize_with_hint`. To enable validation and benchmarking, a `PceExtract` subcommand was added to the `cuzk-bench` tool, along with a public `extract_pce_from_c1` helper in the pipeline module. Warnings in `cuzk-pce` were cleaned up, and all relevant crates (`cuzk-pce`, `cuzk-bench`, `cuzk-core`) compiled cleanly, confirming the structural integrity of the integration. This chunk represents the critical "wiring" phase of Phase 5, transitioning the PCE from a standalone crate into a fully integrated component of the proof pipeline. The systematic replacement of all synthesis call sites and the addition of a dedicated benchmark command demonstrate a methodical approach to validation. With the infrastructure now in place, the stage is set to empirically validate whether the PCE MatVec approach delivers the projected speedup over the traditional synthesis path, directly targeting the computational bottleneck identified at the end of Phase 4.

Wiring the Revolution: How the Pre-Compiled Constraint Evaluator Was Integrated into the cuzk Proving Pipeline 2988 words

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