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Duff's device (ca. 1984)

register n = (count + 7) / 8; /* count > 0 assumed */

switch (count % 8)
{
case 0: do { *to = *from++;
case 7: *to = *from++;
case 6: *to = *from++;
case 5: *to = *from++;
case 4: *to = *from++;
case 3: *to = *from++;
case 2: *to = *from++;
case 1: *to = *from++;
} while (--n > 0);
}


Via jargon file, Kommentar von Tom Duff