[ python-Bugs-1245381 ] log() on a big number fails on powerpc64

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Bugs item #1245381, was opened at 2005-07-26 09:38
Message generated for change (Comment added) made by nnorwitz
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Category: Python Interpreter Core
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Jiri Dluhos (jdluhos)
Assigned to: Nobody/Anonymous (nobody)
Summary: log() on a big number fails on powerpc64

Initial Comment:
The log() function seems to give incorrect results for
large numbers on a 64-bit powerpc architecture. The
test_math program from the Python test suite fails with
the following message:

math module, testing with eps 1e-05
constants
acos
asin
atan
atan2
ceil
cos
cosh
degrees
exp
fabs
floor
fmod
frexp
hypot
ldexp
log
Traceback (most recent call last):
  File "test_math.py", line 117, in ?
    testit('log(10**40, 10)', math.log(10**40, 10), 40)
  File "test_math.py", line 13, in testit
    raise TestFailed, '%s returned %f, expected %f'%test.test_support.TestFailed: log(10**40, 10) returned
21.938200, expected 40.000000

Tested on a SMP IBM PowerPC machine, with Python 2.3.4
(64-bit build).

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>Comment By: Neal Norwitz (nnorwitz)
Date: 2005-09-29 23:36

Message:
Logged In: YES 
user_id=33168

Can you test with newer versions of Python, preferrably 
2.4.2 or current CVS?  2.3.4 worked for me on 64-bit Opteron.

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