Clarification: This is INTEGER subtract.
On Sun, Jan 13, 2013 at 1:31 PM, Timothy Normand Miller <[email protected]>wrote: > For addition, overflow is easy: Keep track of the sign bits of the inputs > and output and do a little logic. (Overflow if the A and B have the same > sign, while C has a different sign.) > > For subtract, we compute the 1's complement of B and then add with a carry > in. If we compute overflow based on B's sign after the 1's complement, is > that mathematically the same? I think the one place where this could go > wrong is if we subtract zero and don't consider that the sign doesn't > change, but I can special-case that. > > -- > Timothy Normand Miller, PhD > Assistant Professor of Computer Science, Binghamton University > http://www.cs.binghamton.edu/~millerti/ > Open Graphics Project > -- Timothy Normand Miller, PhD Assistant Professor of Computer Science, Binghamton University http://www.cs.binghamton.edu/~millerti/ Open Graphics Project
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