wide-int, fortran

[Tobias Schlüter]

Hi,

On 2013-11-24 22:38, N.M. Maclaren wrote:
> The main problem is that integer constant expressions in C are limited to
> the built-in operators, of which the only tricky ones are division and
> remainder (and, occasionally, multiplication) - see C11 6.6#3.  Fortran
> is not so limited, and there are much wider requirements for expression
> evaluation at compile time.

please note that the standard-mandated compile-time evaluation is 
handled almost [*] entirely inside the Fortran frontend, viz. arith.c, 
resolve.c, simplify.c, intrinsic.c, maybe others, whereas the wide-int 
changes deal with the middle-end interface and touches none of these files.

Cheers,
- Tobi

[*] TRANSFER the a special case because it needs to know memory layouts

>> But at both ends of the compiler there are still limits.
>
> And my point is that this is NOT an area that separates cleanly into
> front and back end!
>
> However, from your description, this is one component of any solution
> for gfortran, and it doesn't sound as if it will cause trouble until
> and unless someone wants to extend gfortran to wider types.  They will
> then have to implement the other components ....
>
>
> Regards,
> Nick Maclaren.
>
>
>