Devisive

Duffs device
The original usenet posting
Google 20 year usenet timeline

I first saw this a few weeks back on googles 20 year usenet timeline. Sometimes optimisation can be so cool.

send(to, from, count)

register short *to, *from;

register count;

{

	register n=(count+7)/8;

	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);

	}

}