Although not directly related to the stack-alignement issue (remember, 
stack is 8-byte aligned at entry to a function so that ldrd can be used if 
desired for the target machine), it is also suggested that malloc(3) 
behave similarly.  In that way, when objects are known to be allocated 
from the heap, an ldrd/strd operation can be safely used.

Does our Malloc do this?

R.