https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105924
Lin-Hui Ye <yelinhui at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |CLOSED
--- Comment #2 from Lin-Hui Ye <yelinhui at hotmail dot com> ---
Sorry I didn't know this is an underflow. I was expecting exp(-160000) to give
a value close to zero. Thanks for the explanation.
Linhui
(In reply to kargl from comment #1)
> Why do you thing that you should not get an exception?
>
> e = -400
> e*e = 160000
> -e*e = -160000
> exp(-e*e) = exp(-160000) <-- This is going to underflow to zero.
>
> You specifically asked gfortran to signal an exception if
> underflow occurs with the -ffpe-trap=underflow option. The
> underflow threshold occurs at x = -745 for exp(x).
