it's just like C's switch, right? not at all, absolutely not. consider: switch (count % 8) { case 0: do { *to = *from++; case 7: *to = *from

it's just like C's switch, right? not at all, absolutely not. consider: 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); } https://en.wikipedia.org/wiki/Duff's_device https://en.wikipedia.org/wiki/Duff's_device