Format		Address computation
(register)		address = contents of register
k		address = k
k(register)		address = k + contents of register
symbol		address = &symbol = address of symbol
symbol ± k		address = &symbol ± k
symbol ± k(register)		address = &symbol ± (k + contents of register)

where k is a literal constant value (e.g. 4 or 0x10000000)