"The first operand is the destination register and the second is the D-Form address to load."
第一个操作数是目标寄存器，第二个操作数是要加载的D - Form地址。
"o" : A memory operand is allowed, but only if the address is offsettable. ie, adding a small offset to the address gives a valid address.
对内存的操作被允许，但是必须支持地址偏移值，即，对于给出的地址，加上一个偏移量，此时也是一个合法的地址。
This is because a call or jump statement's machine code operand is a relative address.
这是因为调用或跳转语句的机器码操作数是相对地址。
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