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bpo-29602: fix signed zero handling in complex constructor. (#203) (#205)

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* Fix incorrect handling of signed zeros for complex-related classes.

* Add Misc/NEWS entry.

(cherry picked from commit 112ec38c15)
This commit is contained in:
Mark Dickinson 2017-02-20 21:50:49 +00:00 • committed by GitHub
parent 66fa9d4205
commit 0936a00fe0
3 changed files with 30 additions and 3 deletions
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6
Objects/complexobject.c
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@ -1014,11 +1014,11 @@ complex_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
return NULL;
}
cr.real = PyFloat_AsDouble(tmp);
cr.imag = 0.0; /* Shut up compiler warning */
cr.imag = 0.0;
Py_DECREF(tmp);
}
if (i == NULL) {
ci.real = 0.0;
ci.real = cr.imag;
}
else if (PyComplex_Check(i)) {
ci = ((PyComplexObject*)i)->cval;
@ -1040,7 +1040,7 @@ complex_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
if (ci_is_complex) {
cr.real -= ci.imag;
}
if (cr_is_complex) {
if (cr_is_complex && i != NULL) {
ci.real += cr.imag;
}
return complex_subtype_from_doubles(type, cr.real, ci.real);