No, doing it in hardware makes more sense. If you expect overflows you disable overflow checks in the hardware and everything is as before. If you don't expect

No, doing it in hardware makes more sense. If you expect overflows you disable overflow checks in the hardware and everything is as before. If you don't expect overflows you enable overflow checks in the hardware and if you have a bug you get the exception. If you do it in software you have to execute additional instruction every time but they will do nothing useful if your program is correct.