#include<stdio.h>
#include<stdlib.h>

long sum_array(long*, size_t);	

// Array pointer is in rdi
// length is in rsi
asm("sum_array: \n"
	"	mov $0, %rax\n"
	"top:\n"
	"	add (%rdi), %rax\n"
	"	add $8, %rdi\n"
	"	dec %rsi\n"
	"	cmp $0, %rsi\n"
	"	jne top\n"
	"	ret\n"
);

long other_sum_array(long* a, size_t len){
	long sum = 0;
	do {
		sum += *a;
		a++;
		len--;
	} while (len);
	return sum;
}

int main(int argc, char ** argv){
	long stack_array[] = {2, 4, 6, 8, 10};
	printf("Sum:  %ld\n", sum_array(stack_array, 5));

	long *heap_array = malloc(sizeof(long) * 5);
	heap_array[0] = 20;
	heap_array[1] = 40;
	heap_array[2] = 60;
	heap_array[3] = 80;
	heap_array[4] = 100;
	printf("Sum:  %ld\n", other_sum_array(heap_array, 5));
	free(heap_array);	

	return 0;
}