代码

int plus(int a, int b) {
	int x = a, y = b;
	asm("add %0, %1" : "=r"(x), "=r"(y));
	if (x == a || y == b || x == a + b || y == a + b) {
		return a + b;
	} else {
		return 0;
	}
}

评测结果