On Wed, Nov 25, 2009 at 2:52 PM, Bingfeng Mei <b...@broadcom.com> wrote: > Hello, > It seems to me that tree balancing risk of producing wrong result due > to overflow of subexpression. > > Say a = INT_MIN, b = 10, c = 10, d = INT_MAX. > > If > ((a + b) + c) + d)) > > becomes > ((a + b) + (c + d)) > > c + d will overflow and the original won't. So the behaviour of > two are different. Though the architecture may manage to produce > correct result, it is undefined I think.
We only associate usigned arithmetic for exactly this reason. Richard.
