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Postings from May 2008
On Thu, 22 May 2008 15:27:38 +0200, Abigail <abigail@abigail.be> wrote:
> On Wed, May 21, 2008 at 10:14:48AM -0700, Lourdes Pe??a Castillo wrote:
> > # New Ticket Created by "Lourdes Pe??a Castillo"
> > # Please include the string: [perl #54590]
> > # in the subject line of all future correspondence about this issue.
> > # <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=54590 >
> >
> >
> > Hi,
> >
> > If I run the following code in perl v5.8.8 built for
> > x86_64-linux-thread-multi, l get the error "Can't take log of 0 at - line
> > 1."
> >
> > perl
> > print log(2.5e-310)/log(10);
> > ^D
> >
> > But if I run it in perl v5.8.7 built for i486-linux-gnu-thread-multi, I get
> > the answer -309.602059991328.
> >
> > Is this a known issue with perl 5.8.8. for 64bits? Thanks!
>
> I see a difference depending on whether Perl was build using 64 bit
> integers or not, I get the error when running with 32 bit build, and
> -309.602059991327962 when running with a 64 bit build. The version
> (5.8.7, 5.8.8, 5.10.0) doesn't matter, nor does it matter whether it
> was build with threads or not.
>
> It seems that in a 32-bit build, 2.5e-310 gets constant folded to 0.
weird. both my perls were 64bitint. one of them 64bitall
that doesn't match your finding
--
H.Merijn Brand Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using & porting perl 5.6.2, 5.8.x, 5.10.x on HP-UX 10.20, 11.00, 11.11,
& 11.23, SuSE 10.1 & 10.2, AIX 5.2, and Cygwin. http://qa.perl.org
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http://www.goldmark.org/jeff/stupid-disclaimers/
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