如果CU是连续的(即完整地加载到内存中)，则可以获得编译单元的高位、低位内存地址值。
If the CU is contiguous (that is, it is loaded into memory in one piece) then there are values for the low and high memory addresses for the unit.
许多这些返回值是由宏生成的，它们设置低位为有效的Microsoft Win32错误码将高位设置为8007。
Many of these return values are generated by a macro that sets the low word to a valid Microsoft Win32 error code and the high word to 8007.
这就是说，在x86系统上，最低位字节(最小值)首先存储在ll的第一个字节中；在Power Architecture系统上，它们则存储到最后。
That is to say, on the x86 system, the least-significant byte (the smallest values) are stored in the first byte of ll; on the Power Architecture system, they're stored in the last.
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