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.
由於所有ARM指令將對齊，無論是32 - 或16位邊界本身，該地址的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.
如果要加載自的地址不是一個 16 字節的邊界，它就會將該地址的最後四位截斷然後再加載，以便使其能夠加載。

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UNESCO: MEDIA SERVICES