On 6/3/2020 8:11 PM, Dennis Lee Bieber wrote:
On Tue, 2 Jun 2020 12:26:16 -0500, Albert Chin
<python-l...@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".
Execute "print(1.0-eps, tiny)" and see if they differ.
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)?
This is a more likely source of the change than our code.
--
Terry Jan Reedy
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https://mail.python.org/mailman/listinfo/python-list
