If any of the operands is a float, then all operands are evaluated as floats, and the results are floats.
如果任意一个操作数是浮点型的，则所有操作数都将按浮点型进行计算，并且结果也是浮点型的。
The input operands are the C expressions that serve as input operands to the instructions.
输入操作数是充当指令输入操作数使用的C表达式。
There are two %'s prefixed to the register name. This helps GCC to distinguish between the operands and registers. operands have a single % as prefix.
双%%前缀，指明这是一个寄存器名。单%指明操作数。 这帮组GCC辨别操作数和寄存器。
Multiplication and division have higher precedence than addition. Their operands are bound to the operator in preference to the operands to addition.
乘法和除法的优先级高于加法操作，于是它们的操作数先于加法操作的操作数计算。
Precedence specifies how the operands are grouped. It says nothing about the order in which the operands are evaluated.
优先级规定的是操作数的结合方式，但并没有说明操作数的计算顺序。
However, it can also concatenate numeric operands with string operands.
不过，它也可以串连数值运算元和字串运算元。
If there are no output operands but there are input operands, you must place two consecutive colons surrounding the place where the output operands would go.
如果没有输出操作，但是又有输入，你必须使用连续两个冒号，两个连续冒号中无内容，表示没有输出结果的数据操作。
If there are no output operands but there are input operands, you must place two consecutive colons surrounding the place where the output operands would go.
如果没有输出操作，但是又有输入，你必须使用连续两个冒号，两个连续冒号中无内容，表示没有输出结果的数据操作。
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