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• 17:36, 23 November 2025 PC talk contribs created page When Rust Won’t Vectorize: How to See Why, Prove Whose Fault It Is (rustc vs LLVM), and Fix It (x86 and AArch64) (Created page with "500px You’ve got a hot loop that blazes on x86_64 but stubbornly refuses to vectorize on aarch64. You peek at LLVM IR, you squint at Godbolt, you try a few tweaks…and still no SIMD on Apple M-series or modern ARM servers. Let’s solve this properly: * What’s happening? Your loop shape asks for gathers from src + an in-place RMW store to latents. x86 can often paper over this with AVX2 gathers and tolerant alias analys...")