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C++ vs Rust: which is faster?

I ported some Advent of Code solutions from C/C++ to Rust, and used the opportunity to compare performance. When I couldn't explain why they performed differently, I had no choice but to disassemble both and look at what the codegen was like!

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Day 18 (Advent of Code 2022)

This time around, we're porting a solution from C++ to Rust and seeing how it feels, how it performs, and what we can learn about both languages by doing that.

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