在PCI总线一侧，其操作寄存器组（PCI Bus Operation Registers）的大小为64个字节（即16个连续的双字长），通过PCI配置空间的基地址寄存器BADR0（Base Address Register 0）映射到存储器空间或I...
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它还规定在存储设备与一组32位矢量寄存器(Vector Register, VR)之间存取和储存的字节、半字、字和四字操作数。
It also provides for byte, halfword, word, and quadword operand fetches and stores between storage and a set of 32 Vector Registers (VRs).
双%%前缀，指明这是一个寄存器名。 单%指明操作数。 这帮组GCC辨别操作数和寄存器。
There are two %'s prefixed to the register name. This helps GCC to distinguish between the operands and registers. operands have a single % as prefix.
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