mirror of https://github.com/python/cpython
Fix integer negation and absolute value to not rely
on undefined behaviour of the C compiler anymore. Will backport to 2.5 and 2.4.
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@ -116,6 +116,7 @@ class BuiltinTest(unittest.TestCase):
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self.assertEqual(abs(0), 0)
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self.assertEqual(abs(1234), 1234)
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self.assertEqual(abs(-1234), 1234)
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self.assertTrue(abs(-sys.maxint-1) > 0)
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# float
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self.assertEqual(abs(0.0), 0.0)
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self.assertEqual(abs(3.14), 3.14)
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@ -12,6 +12,9 @@ What's New in Python 2.6 alpha 1?
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Core and builtins
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-----------------
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- Integer negation and absolute value were fixed to not rely
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on undefined behaviour of the C compiler anymore.
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- Bug #1566800: make sure that EnvironmentError can be called with any
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number of arguments, as was the case in Python 2.4.
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@ -754,10 +754,9 @@ int_pow(PyIntObject *v, PyIntObject *w, PyIntObject *z)
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static PyObject *
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int_neg(PyIntObject *v)
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{
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register long a, x;
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register long a;
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a = v->ob_ival;
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x = -a;
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if (a < 0 && x < 0) {
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if (a < 0 && (unsigned long)a == 0-(unsigned long)a) {
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PyObject *o = PyLong_FromLong(a);
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if (o != NULL) {
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PyObject *result = PyNumber_Negative(o);
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@ -766,7 +765,7 @@ int_neg(PyIntObject *v)
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}
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return NULL;
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}
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return PyInt_FromLong(x);
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return PyInt_FromLong(-a);
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}
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static PyObject *
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