Re: [ANN] Lua 5.3.0 (work1) now available

[Philipp Janda <siffiejoe@...>]

Am 08.07.2013 11:46 schröbte Tony Finch:
> Miles Bader <miles@gnu.org> wrote:
> > I haven't looked at the implementation, but I suppose it may simply
> > use C unsigned values to represent integers, or when doing arithmetic
> > on them ...
>
> Yes. In lvm.h:
>
> #define intop(op,v1,v2) \
> 	cast_integer(cast_unsigned(v1) op cast_unsigned(v2))

That may not do what is expected, because it involves 
implementation-defined behavior:

3.2.1.2 Signed and unsigned integers
[...]  When an integer is demoted to a signed integer with smaller size, 
or an unsigned integer is converted to its corresponding signed integer, 
if the value cannot be represented the result is implementation-defined.

Philipp