Feat/fri early termination#729
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Benchmark — ethrex 20 transfers (median of 3)Table parallelism: auto (cores / 3)
Commit: 4046577 · Baseline: cached · Runner: self-hosted bench |
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FRI stops folding when the polynomial reaches degree < 2^k (k = ProofOptions.fri_final_poly_log_degree, default 7) instead of folding to a single constant. The prover sends the 2^k final-polynomial coefficients (fri_final_poly_coeffs); the verifier reconstructs the terminal codeword via a coset FFT (base-field twiddles) and checks each query against it, with a structural degree-bound check and a clamp for tiny traces. k is bound into the Fiat-Shamir statement (DOMAIN_TAG _V3). Impact (blowup 2, 219 queries): ~225 KB smaller proof, constant across trace size (~16% at 2^20, 25% at 2^16); verifier does ~6,132 fewer Keccak compressions and ~1,840 fewer Fp3 muls per proof. - Prover interpolates the terminal poly on the minimal 2^k sub-coset (no oversized iFFT, no zero-trim). - GPU FRI commit (cuda) supports early termination, mirroring the CPU path; validated on a CUDA server (proof verifies, gpu_fri_calls fires). - Soundness: tampered / over-length / under-length coeffs and cross-k all reject; terminal codeword<->coeffs roundtrip; single-fold + clamp cases.
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