maxval on -inf and nan in Fortran

[Jakub Jelinek]

On Fri, Feb 28, 2020 at 06:50:20PM +0100, Thomas Koenig wrote:
> Am 28.02.20 um 17:58 schrieb Steve Kargl:
> > Replacing MIN_EXPR/MAX_EXPR (everywhere?) would seem to
> > be a pessimization for correctly written code.
> 
> Also note the following part of changes.html for 9.2:
> 
> The MAX and MIN intrinsics are no longer guaranteed to return any
> particular value in case one of the arguments is a NaN. Note that this
> conforms to the Fortran standard and to what other Fortran compilers do.
> If there is a need to handle that case in some specific way, one needs
> to explicitly check for NaN's before calling MAX or MIN, e.g. by using
> the IEEE_IS_NAN function from the intrinsic module IEEE_ARITHMETIC.
> 
> This was discussed (and decided) at the time.

But then the tests shouldn't actually test it, or should be restricted
to targets where it will work anyway at least.

	Jakub