Division issue with 3.8.2 on AIX 7.1

[Albert Chin]

On Wed, Jun 03, 2020 at 08:11:17PM -0400, Dennis Lee Bieber wrote:
> On Tue, 2 Jun 2020 12:26:16 -0500, Albert Chin
> <python-list at mlists.thewrittenword.com> declaimed the following:
> 
> >I've built Python 3.8.2 on AIX 5.2, 5.3, 6.1, and 7.1. I am seeing
> >different results for the following Python program:
> >  $ python3 -c "eps = 2.0 ** -53.0; tiny = 2.0 ** -1022.0; \
> >print ((1.0 - eps) / tiny * 4.0)"
> >
> >I get the correct result, 1.7976931348623157e+308, on AIX 5.2, 5.3,
> >and 6.1. But, on 7.1, I get "inf".
> >
> >Anyone know where can I look in the Python source code to investigate
> >this?
> 
> Have you considered that it might be something in an underlying C
> library (especially for the double-precision exponentiation)?

On Wed, Jun 03, 2020 at 08:44:47PM -0700, Miki Tebeka wrote:
> > Anyone know where can I look in the Python source code to investigate
> > this?
>
> Probably around
> https://github.com/python/cpython/blob/master/Objects/floatobject.c

Thanks to both of you. I applied some updated OS patches and the
problem went away.

-- 
albert chin (china at thewrittenword.com)