Message76890
| Author |
skip.montanaro |
| Recipients |
mark.dickinson, skip.montanaro |
| Date |
2008年12月04日.15:49:40 |
| SpamBayes Score |
7.260962e-07 |
| Marked as misclassified |
No |
| Message-id |
<18743.64529.80385.143932@montanaro-dyndns-org.local> |
| In-reply-to |
<1228339825.17.0.783504500876.issue4506@psf.upfronthosting.co.za> |
| Content |
Mark> If you have time, could you try the attached patch and report what
Mark> gets printed when cmath.exp(710+1.5j) is called? On my machine, I
Mark> get:
...
Looks similar here:
% ./python
Python 3.0 (r30:67503, Dec 3 2008, 14:46:39)
[GCC 4.2.2] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> import cmath
>>> cmath.exp(complex(710.0, 1.5))
r.real, r.imag: 1.58027e+307, Inf
Py_IS_INFINITY(r.real), Py_IS_INFINITY(r.imag): 0, 1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OverflowError: math range error
If I then comment back out your two printf statements and recompile, it once
again fails to raise OverflowError:
% ./python
Python 3.0 (r30:67503, Dec 3 2008, 14:46:39)
[GCC 4.2.2] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> import cmath ; cmath.exp(complex(710.0, 1.5))
(1.5802653829857376e+307+inf*j)
Very weird. If I uncomment either of your printf statements OverflowError
seems to be raised as expected. It's as if some register bit isn't being
set unless you reference r.real or r.imag multiple times.
Skip |
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