指令4可以在指令3之后紧接的那个时钟周期执行，因为它不需要指令3的结果来执行。
Instruction 4 can be issued in the clock cycle immediately after instruction 3 because it does not require the result of instruction 3 to execute. You can visualize it like this.
调试这个问题的一种方法是对这个可执行程序执行objdump命令，并将其结果保存到一个文件中；然后查找出错的指令(在本例中，出错的操作码是98080000)。
One way of debugging this failure is to do an object dump of the executable and save it in a file, then search for the failed instruction (in this case, the failed opcode is 98080000).
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。
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.
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