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The article claims this is portable C. Given the use of intel intrinsics, what happens if you try to compile it for ARM64?

I think they mean portable between modern x86 CPUs as opposed to truly portable.

You'd need first to convert it to portable SIMD intrinsics. There are several libraries.

Apparently it also needs Clang to achieve the same performance: https://news.ycombinator.com/item?id=40875968