Re: The new 'isinf.c' function in port.

On Thu, 5 Feb 1998, Billy G. Allie wrote:

> Hi Marc,
>
> I was looking at the new 'isinf.c' function in the src/backend/port directory.
> I have a question about the inclusion of cases for FP_SNAN and FP_QNAN.
>
> Does the 'isinf' function mean "not finite" or "is infinity"?
>
> If it is to mean "not finite", then (IMHO) then checking for FP_SNAN and
> FP_QNAN is appropiate. If it is to mean "is infinity", then the function
> should only be checking (again, IHMO) for FP_NINF and FP_PINF.

Good question...

From FreeBSD's man page:

The isninf() function returns 1 if the number is ``infinity'', otherwise
0.

In my defence, those functions were just pulled in from the
various ports themselves...I believe you are correct about removing
FP_SNAN/FP_QNAN...