boundary address

基本解释

Since all ARM instructions will align themselves on either a 32- or 16-bit boundary, the LSB of the address is not used in the branch directly.
由于所有ARM指令将对齐，无论是32 - 或16位边界本身，该地址的LSB是不是用在直接分支。
czhihao2008.blog.163.com
If it is given an address to load from that is not at a 16-byte boundary, it simply zeroes out the last four bits of the address before loading it so that it will be an aligned load.
如果要加载自的地址不是一个 16 字节的边界，它就会将该地址的最后四位截断然后再加载，以便使其能够加载。

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UNESCO: MEDIA SERVICES