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Good point! It would be interesting to find out where the Rust version gets most of its speed from.

The Rust compiler can auto-vectorize loop code.

This blog post shows how to write simple idiomatic Rust code that will allow the compiler to auto-vectorize:

But, C and C++ compilers also can autovectorize quite well. I had some SSE & AVX algorithms where the compiler ended up doing the same or lightly better job in C++ for instance.

So maybe it's just the C benchmark being a cargo cult.

Yes, it could be mostly LLVM doing the heavy lifting here, for all we know.

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