1·Get operands and perform the operation.
获取操作数并执行运算。
2·These instructions perform element-by-element comparisons of their two operands.
这两条指令对自己的两个操作数逐元素进行比较。
3·Now let's take a look at how to specify individual registers as constraints for the operands.
现在让我们看一下如何将个别寄存器作为操作数的约束指定。
4·If the character is an operator, pop two operands, perform the appropriate operation, and then push the result onto the stack.
如果字符是个操作符，弹出两个操作数，执行恰当操作，然后把结果压入堆栈。
5·This will cause the other operands to be promoted to 64-bits and no further conversion is needed when the expression is assigned.
这会导致其他操作数也被转换成64位的类型，这样在对表达式进行赋值时就不需要再进行转换了。