/* The original Duff's device, with unsupported switch/do combination
void send(short *to, short *from, int count)
	{
		int 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);
		}
	}
*/

/* The original Duff's device, altered for copying
void copy(short *to, short *from, int count)
	{
		int 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);
		}
	}
 */

/* Using goto instead: */
void copy(short *to, short *from, int count)
	{
		int n=(count+7)/8;
		switch(count%8){
		case 0:	dolab:	*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++;
			if (--n>0) goto dolab;
		}
	}

int main(void) {
  short arr1[3] = {1,2,3};
  short arr2[3];

  copy(arr2,arr1,3);

  return arr2[0] + arr2[1] + arr2[2];
}