high-order bit

Because channels are written using a register's preferred word-sized slot, the 64-bit address already has the high-order bits in the preferred slot.

由于信道是通过寄存器单字大小的首选槽写入的，所以64位地址在首选槽内已经有了高阶位。

The effective address is, under the hood, always split into a pair of 32-bit registers; the high-order register is optional and if it's not specified, it is treated as zero.

在这种情况下，有效地址总是分为两个32位的寄存器；高位寄存器是可选的，如果没有指定，就会被当作零进行处理。

Hexadecimal constants without a suffix are defined as an unsigned int if it will fit into 32-bits and if the high order bit is turned on.

如果一个没有后缀的16进制的常量是32位的，并且其高位被置位了，那么它就可以作为无符号整型进行定义。