The range of immediate addressing in the ARM instruction set-EEWORLD

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Why is this? After searching the Internet, I found many related discussion posts. Combined with my own understanding, I came to the following conclusion.

If you are interested, you can search for this keyword, 8-bit bitmap. It turns out that our second operand follows this rule.

The above explanation text comes from the ARM Processor Instruction Set, and two pictures are attached:

So, we can summarize it like this:

1. To determine whether a number conforms to the principle of 8-bit bitmap, first check whether the number of 1s in the binary representation of the number does not exceed 8. If not, then check whether these n 1s (n<=8) can be put into 8 binary bits at the same time. If they can be put in, then check whether these eight binary bits can be cyclically right-shifted by even bits to get the number we want to use. If so, this number conforms to the principle of 8-bit bitmap and is a legal immediate number. Otherwise, it does not conform.

2. The 32-bit number that cannot be represented can only be obtained through other means such as logical or arithmetic operations. For example, 0xFFFFFF00 can be obtained by bitwise inversion of 0x000000FF.

Keywords：ARM Reference address：The range of immediate addressing in the ARM instruction set

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