通常，只需输入寄存器名便可以显示寄存器的内容。
Normally, you can display register contents just by entering the register name.
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.
您只需要为寄存器分配它自己的符号名并增加NUMREGS的值即可。
You would just assign the register its own symbolic name and increase the value of NUMREGS.
当生成多个专用寄存器时，必须用相关联的文件名指定对LINAGE - COUNTER的每个引用。
When more than one special register is generated, you must qualify each reference to a LINAGE-COUNTER with its related file name.
当生成多个专用寄存器时，必须用相关联的文件名指定对LINAGE - COUNTER的每个引用。
When more than one special register is generated, you must qualify each reference to a LINAGE-COUNTER with its related file name.
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