N body

AbstractSX-NBody is a high-performance framework for the exact all-pairs gravitational N-body problem, combining ARM NEON SIMD vectorization with a lock-free atomic work-dispatch mechanism. The inner force kernel leverages hardware reciprocal square-root instructions with Newton–Raphson refinement to achieve efficient and accurate computation.Evaluated on consumer-grade ARM big.LITTLE hardware with N = 20,000 bodies, the framework achieves a 12.20× speedup over a scalar single-thread baseline, sustaining 68.2 GFLOPS and demonstrating 95.1% parallel efficiency, indicating near-orthogonal composition of SIMD and multicore parallelism.This work is released as open prior art under the PolyForm Noncommercial License 1.0.0 to support noncommercial research, education, and reproducibility