I found the following link interesting, and it gives good explanation for aligned and unaligned memory accesses, and why some processors do not support it.
http://www-128.ibm.com/developerworks/library/pa-dalign/
But I am fully not convinced why some processors dont handle the unaligned accesses,
although the circuitry to perform the adjustment is going to be cheap. That part is not clearly stated, here.
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