推 sasbluesea:因為如果要正負 那麼若用2補數表示 最大到 2^15 - 1 05/06 01:00
→ bernachom:我懂了，謝謝您 05/06 01:06
A displacement addressing mode has an offset specified relative to a
base value. An example is shown below:
Add R4,100(R1) (meaning: R4<-R4+M[100+R1])
The value 100 in the above example is called the displacement.
In a machine in which all instructions are 32 bits with a 6-bits opcode,
what is the maximum value of the displacement. Assume that the machine has
32 general-purpose registers.
書上寫:32－6－5－5＝16 bit
可是後面又寫了一句：如果以2's complement 來表示，最大正值為2^15 -1
這是什麼意思呢?
謝謝
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