--- Comment #9 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 17 May 2018, wrote:

> --- Comment #8 from Andreas Schwab <> ---
> > Is there sth like -NaN?!
> signbit can tell you.

True.  I guess that also asks for the guarantee on the operand
for tree_single_nonnegative_warnv_p returning true.  Does it
guarantee that OP >= 0 compares as true?  Or merely !(OP < 0)?
So does it make sense for the function to return true for +NaN
or should we err on the side of caution and not do that?

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