How fast can a 6502 transfer memory

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  • wuffs

    Wrangling Untrusted File Formats Safely

    Tom Duff's device was doing that because he's doing MMIO, you should not [I know you're not suggesting it, but just in case anybody reading thinks it's clever] do this today when you don't want MMIO, your compiler is very capable of just doing an actual copy quickly, so tell it that's what you want, don't write gymnastics like Duff's device.

    However, expressing these partially unrolled loops nicely is a nice performance-not-safety feature of WUFFS called "Iterate loops":

    https://github.com/google/wuffs/blob/main/doc/note/iterate-l...

    Well, I say performance not safety, as always they want both, but you could safely just write the never unrolled case, while the existence of Iterate loops allows you to express a much faster special case but know the compiler will fix things up properly no matter what.

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