Inlining always reduces the number of instructions executed (since at a minimum the call and return instructions are not executed), but it can (and often does), make the resulting code bigger.
内联总是减少指令执行的数量(这是由于最低限度的调用和返回指令没有被执行)，但是它能(并经常)让结果代码变得很大。
Cons: Overuse of inlining can actually make programs slower. Depending on a function's size, inlining it can cause the code size to increase or decrease.
限制：过度使用内联函数实际上会使减慢程序运行，取决于函数体大小，它决定了代码增加或减少。
The decision to inline is based on an estimate as to whether inlining will result in smaller code size.
决定内联是基于估计到是否内联将导致更小的代码尺寸。
The decision to inline is based on an estimate as to whether inlining will result in smaller code size.
决定内联是基于估计到是否内联将导致更小的代码尺寸。
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