forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
908dae180b
A supernodal LDLᵀ on the Cholesky factor's symbolic factorization (ordering, supernodes, fill, cap and parallel subtree tasks shared through a Symbolic and a generic driver; the Cholesky numerics are unchanged bit for bit). Pivots by the bounded Bunch–Kaufman (rook) search of Ashcraft, Grimes & Lewis among each supernode's columns (Schenk & Gärtner's supernode Bunch–Kaufman), 1 × 1 and 2 × 2, right-looking panels whose trailing update reuses the tiled Cholesky kernels with L D formed on the fly. Reports the inertia; a column without a pivot above round-off is a located Singular error; NaN is refused. Symmetric::new picks Cholesky, LDLᵀ, or Cholesky with an LDLᵀ fallback; solve_refined adds iterative refinement. 1.1–1.2× the Cholesky time on a 140 000-equation hex8 pattern. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm