Re: denormalized FP numbers causing exceptions

[Uncle George <gatgul voicenet com>]

try cc -mieee

all denorns are trapped. the -mieee option sets u with the ieee
standards of float numbers & exception handling. u should be aware that
there is a cost, as denorms are processed via kernel software. but at
least u keep goin'
/gat

"Robert M. Riches Jr." wrote:

> On Redhat 7.1, default GCC version 2.96, I'm getting floating
> exceptions on what appear to be denormalized numbers.  The code
> is the Bow (or rainbow) information retrieval toolkit, and it's
> blowing up in the following code:
>
>           double scores_sum = 0;
>           for (ci = 0; ci < barrel->cdocs->length; ci++)
>             scores_sum += scores[ci];
>
> It appears whenever an input to the '+=' operator is less than
> 10^300, 10^308, or so, I get the floating exception.  At least
> one of the numbers is around 1, so the tiny numbers could be
> rounded to zero and it wouldn't affect the final result.  I
> suppose I could try to add code to change an array element to
> zero if it was less than about 10^290, but this may hit the same
> exception as the addition attempt.
>
> Is there a compiler option to either not generate denormalized
> numbers or to handle them gracefully?
>
> Thanks.
>
> Robert Riches
> richesr1@inetarena.com
> rriches@cse.ogi.edu
>
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