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Re: [gfortran] Fix NEAREST constant folder
On Tue, Apr 12, 2005 at 01:16:19PM -0700, Richard E Maine wrote:
> On Apr 12, 2005, at 1:06 PM, Steve Kargl wrote:
>
> >AFAIK, the standard does not define
> >the meaning of "machine representable number".
>
> I think the normal English definition applies (as it generally does
> when there is a normal English meaning and there isn't an overriding
> technical definition in the standard). Namely...
>
> I would say that "machine representable number" means a number that the
> machine can represent.
>
> Note that this is definitely not the same thing as a "model number".
> The standard does define what a model number is, and it distinguishes
> model numbers from machine representable numbers. (Which isn't to say
> that there might not be places where it gets it wrong, but the
> distinction is made).
>
Yes, that's the interpretation that Tobi and I want to make.
nearest(0.,1.) should return a subnormal number if that is the
nearest "machine representable number". I'm somewhat surprised
that standard did not state "processor-dependent representable
number" in the sense of a Fortran processor. Afterall, a
Fortran processor does not need to be tied to a "machine".
--
Steve