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delta-stepping

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Apple Metal GPU backend for OrthoRoute PCB autorouter -- GPU-accelerated shortest-path routing on Apple Silicon (M1/M2/M3/M4) using Metal Shading Language, replacing CUDA/CuPy. 3.7x faster than RTX 3060 on 400K-node graphs. Zero-copy UMA, persistent thread SPFA, Delta-Stepping, SIMD block stealing.

  • Updated Jul 4, 2026
  • Python

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