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To complete the completion of the TL;DR : the 95% safe Rust Code using auto vectorization is even slightly faster than the C code.

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The 95% safe Rust Code does not use any auto-vectorization (https://cliffle.com/p/dangerust/5/nbody-5.rs)

Only the 100% Rust-safe implementation uses auto-vectorization and is at 0.73% of the RUNTIME of the C code. (https://cliffle.com/p/dangerust/6/#performance-evaluation)

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*73%