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Editorial Team
Asked: May 12, 20262026-05-12T11:23:51+00:00 2026-05-12T11:23:51+00:00

I once saw a programming pattern (not design), how to implement a fast copy

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I once saw a programming pattern (not design), how to implement a fast copy of buffers. It included an interleaved loop and switch. The thing was, it copied 4 bytes most of the time, only the last few bytes of the buffer were copied using smaller datatypes.

Can someone tell me the name of it? It’s named after a person. It’s done in C and the compiler output is nearly optimal.

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    Editorial Team
    2026-05-12T11:23:52+00:00Added an answer on May 12, 2026 at 11:23 am

    It sounds like you’re thinking of Duff’s device.

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