Title: [V8] Quantum-Inspired Adaptive Register Allocation (QIARA) in TurboFan – 15–25% faster execution on register-bound workloads
Component: Blink>JavaScript>V8 CC: [email protected] Labels: Type-Feature, Pri-1, V8-Perf, V8-Compiler, Hotlist-Performance, Eng-Review === PROBLEM === Register allocation in TurboFan uses classical graph coloring (Chaitin-Briggs), which is NP-hard and often produces suboptimal results under high spill pressure. This causes 20–40% slowdowns in numerical loops (e.g., TensorFlow.js, scientific computing) due to excessive memory spills. === SOLUTION === Introduce **QIARA (Quantum-Inspired Adaptive Register Allocation)**: 1. When live range count > 8 and spill pressure > threshold, model allocation as a QUBO problem. 2. Solve using **on-device QAOA simulation** (via WASM port of Qiskit/D-Wave Ocean, <5ms on modern CPUs). 3. Apply near-optimal register assignment → minimize spills. 4. Fallback to current allocator if quantum sim unavailable. 5. Optional: Federated learning (opt-in) to improve QAOA seeding over time. === V8 HOOKS === - `src/compiler/register-allocator.cc` → new `QuantumRegisterAllocator` pass - `v8::internal::compiler::GraphColoringPhase` - Background `v8::TaskRunner` for QAOA solve - WASM runtime via `v8::WasmModule` === IMPACT === - **+15–25% execution speed** on register-heavy workloads (Octane, Kraken, ML inference) - **–10–20% power usage** on mobile (fewer cache misses) - **Zero cloud dependency** — fully on-device - Future-proof: swaps to real quantum hardware via WebQuantum API (2028+) === FEASIBILITY === - <5K LOC (mostly WASM + TurboFan integration) - Prototype-ready with `qiskit-wasm` or `dwave-ocean-wasm` - Experimental flag: `chrome://flags/#enable-qiara` - Benchmarks: SPEC CPU2017 JS subset, TensorFlow.js models === WHY THIS IS NOVEL === No JavaScript engine uses quantum-inspired optimization for JIT compilation. This would be a **world-first** for V8 and position Chrome as the leader in next-gen compiler technology. Requesting Intent to Prototype — happy to provide PoC or collaborate with TurboFan team. -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/v8-dev/CA%2BNJL%2BtRCW3S5NRaMH3KSpareMwwBsEsi-_Z12tWQ8EBgKk9FA%40mail.gmail.com.
