代码

#pragma GCC optimize(3)
unsigned int plus(register const unsigned int a,register const unsigned int b)
{
	register unsigned int res;
	__asm__ __volatile__ (
		"add %2, %1;"
		"mov %0, %2;"
		:"=r"(res)
		:"r"(a),"r"(b));
	return res;
}

评测结果