On Duff's Device and Coroutines Posted on Wednesday, January 30, 2008. At first glance, Duff's Device is one of the most mysterious pieces of C code you'll ever see: 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); } } It's an 8x-unrol...