A program references storage using the effective address computed by the processor when it executes a storage Access or Branch instruction or when it fetches the next sequential instruction.
在程序执行Storage Access或Branch指令或者在存取下一条顺序指令时，它将使用处理器计算出的有效地址引用存储设备。
hbr hint_trigger, $register -- This tells the processor that the branch instruction at the relative address hint_trigger is likely to branch to the address specified in register $register.
hbr hint_trigger, $register —— 告诉处理器相对地址 hint_trigger 处的分支指令可能会跳转到寄存器 $register 所指定的地址。
Similarly, whenever the processor develops an instruction address, the low-order two bits are zero.
同样，只要处理器利用指令地址，低阶的两位就为零。
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