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| author | Christian Heimes <christian@cheimes.de> | 2008-04-21 13:08:03 +0000 |
|---|---|---|
| committer | Christian Heimes <christian@cheimes.de> | 2008-04-21 13:08:03 +0000 |
| commit | e57950fbfef77f327d79a73955b42e3696ecf9f0 (patch) | |
| tree | 67d0fdaadc4f912bc78626859b802b37ca1696dd /Modules/cmathmodule.c | |
| parent | 1a3239e94509ac236ee886ce64e6cb0c5a3fea9f (diff) | |
| download | cpython-git-e57950fbfef77f327d79a73955b42e3696ecf9f0.tar.gz | |
Merged revisions 62420-62421,62423-62424 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r62420 | mark.dickinson | 2008-04-20 20:30:05 +0200 (Sun, 20 Apr 2008) | 3 lines
Even more fixes for alpha Tru64, this time for
the phase and polar methods.
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r62421 | mark.dickinson | 2008-04-20 22:38:48 +0200 (Sun, 20 Apr 2008) | 2 lines
Add test for tanh(-0.) == -0. on IEEE 754 systems
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r62423 | amaury.forgeotdarc | 2008-04-20 23:02:21 +0200 (Sun, 20 Apr 2008) | 3 lines
Correct an apparent refleak in test_pkgutil: zipimport._zip_directory_cache contains
info for all processed zip files, even when they are no longer used.
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r62424 | mark.dickinson | 2008-04-20 23:39:04 +0200 (Sun, 20 Apr 2008) | 4 lines
math.atan2 is misbehaving on Windows; this patch
should fix the problem in the same way that
the cmath.phase problems were fixed.
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Diffstat (limited to 'Modules/cmathmodule.c')
| -rw-r--r-- | Modules/cmathmodule.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/Modules/cmathmodule.c b/Modules/cmathmodule.c index 347f88d9f8..d6d1f27cb0 100644 --- a/Modules/cmathmodule.c +++ b/Modules/cmathmodule.c @@ -264,7 +264,8 @@ c_atan(Py_complex z) return r; } -/* Windows screws up atan2 for inf and nan */ +/* Windows screws up atan2 for inf and nan, and alpha Tru64 5.1 doesn't follow + C99 for atan2(0., 0.). */ static double c_atan2(Py_complex z) { @@ -282,6 +283,14 @@ c_atan2(Py_complex z) /* atan2(+-inf, x) == +-pi/2 for finite x */ return copysign(0.5*Py_MATH_PI, z.imag); } + if (Py_IS_INFINITY(z.real) || z.imag == 0.) { + if (copysign(1., z.real) == 1.) + /* atan2(+-y, +inf) = atan2(+-0, +x) = +-0. */ + return copysign(0., z.imag); + else + /* atan2(+-y, -inf) = atan2(+-0., -x) = +-pi. */ + return copysign(Py_MATH_PI, z.imag); + } return atan2(z.imag, z.real); } |