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• 15:33, 14 November 2025 PC talk contribs created page Rust Error : The day I made my Rust code 80× slower by changing one number (Created page with "Summary:
No, Rust doesn’t have a “short array superpower.” What you’re seeing is LLVM’s optimization heuristics kicking in. For arrays below a certain size (here: 239 usizes), LLVM fully unrolls the loop, vectorizes it, and then realizes the inner sum doesn’t change across outer iterations—so it hoists/eliminates the repeated work. At CAPACITY >= 240, the loop is no longer fully unrolled, so LLVM can’t perform the same trick, and your runtime jumps dr...")