Optimisation prevents overflow?

[Davide Mancusi]

Janne Blomqvist wrote:
>> Would you say that "foo" is not portable?
> 
> Yes. If you need more precision or range than what real(8) provides
> you have to use a type with more precision and/or range rather than
> relying on the compiler to keep the variable in the 80-bit x87
> register stack.

But how do I identify those parts of the code that are relying on extra
precision? As you said, in principle all the code is doing it.

Davide