[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: infinity and beyond
In article <201111020203.WAA24875%Sparkle.Rodents-Montreal.ORG@localhost>,
Mouse <mouse%Rodents-Montreal.ORG@localhost> wrote:
>Note this is an _IEEE_ float. A couple of paragraphs earlier:
> Exceptional values usually result from a computation and include plus
> infinity, minus infinity, NaN, and denormalized numbers. Exceptional
> values and the representation of zero are associated only with IEEE
> S_float, T_float, and X_float formats (/FLOAT=IEEE_FLOAT qualifier),
> not with VAX floating-point formats.
>Note "only with IEEE...not with VAX".
>> Should we switch to that?
>Not on the VAX, I would argue. It isn't infinity in any useful sense.
Ok, I got confused by the page.
>> Either way, I think that programs expect to be able to do:
>> double x = INFINITY;
>> and that is currently broken on the vax.
>I think it's a defensible proposition that it _should_ break on the
>VAX, because VAX floating point does not have anything that acts the
>way generally expected by programs that try to manipulate infinities.
>The only useful things I can see that that could turn into on the VAX
>are (1) a reserved operand, (2) the largest representable positive
>value, and (3) a compile-time error.
I think it should compile, otherwise we are not going to be able to build
libm/complex/cproj*.c. I will make it HUGE_VAL or something.
Main Index |
Thread Index |