(j3.2006) exception message on termination

[Robert Corbett]

Thinking back on it, most of the complaints we received were about underflow 
also.  Underflow is usually harmless in codes such as root finders and 
quadrature routines.  On the under hand, underflow can cause silent bad results 
in some matrix computations.

Robert Corbett



On 06/12/13 00:38, Malcolm Cohen wrote:
> The only complaint we got was for reporting underflow, so we added an option to
> suppress that one.
>
> We never report inexact.  I agree it is completely pointless to report inexact,
> in my opinion it was an oversight not to make than an exception to the reporting
> rule.
>
> Cheers,
>
> -----Original Message-----
> From: Robert Corbett
> Date: ?? 25?6?12? 12:59
> To: j3
> Subject: (j3.2006) exception message on termination
>
> Can we delete the second and third sentences of paragraph 2 in Clause 8.4 in the
> upcoming revision?  They state
>
>        If an exception (14) is signaling on that image,
>        the processor shall issue a warning indicating
>        which exceptions are signaling; this warning
>        shall be on the unit identified by the named
>        constant ERROR_UNIT (13.8.2.8).  It is recommended
>        that the stop code is made available by formatted
>        output to the same unit.
>
> Sun FORTRAN 77 produced such output.  It was a constant source of complaints
> from users.  As bad as Sun FORTRAN 77 was in this regard, it did not report
> inexact exceptions, as is required by the text of the standard.
>
> Robert Corbett
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