因为 y 是在输出操作数部分中指定的，所以 %edx 中更新的值存储在 -8(%ebp)，堆栈上 y 的位置中。
Since y is specified in the output operand section, the updated value in %edx is stored in -8(%ebp), the location of y on stack.
可以在输入和输出部分中同时使用多个操作数。
In some cases, a single variable may serve as both the input and the output operand.
也就是说，优先级和结合性决定了表达式的哪个部分用作哪个操作符的操作数。
That is, precedence and associativity determine which part of the expression is the operand for each of the operators in the expression.
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