#include<stdio.h>

asm(
"quadruple: \n"
"	mov %rdi, %rax \n"
"	mov $4, %rdi \n"
"	mul %rdi \n"
"	ret\n" );

long unsigned quadruple(long unsigned);

int main(){
	printf("4 times 6 is %lu\n", quadruple(6));
	return 0;
}