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int_lshift(): Simplified/sped overflow-checking.

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This commit is contained in:
Tim Peters 2002-08-11 17:54:42 +00:00
parent 45daeb093f
commit da1a2212c8
1 changed files with 2 additions and 4 deletions
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6
Objects/intobject.c
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@ -675,15 +675,13 @@ int_lshift(PyIntObject *v, PyIntObject *w)
return NULL;
return PyInt_FromLong(0L);
}
c = a < 0 ? ~a : a;
c >>= LONG_BIT - 1 - b;
if (c) {
c = a << b;
if (a != Py_ARITHMETIC_RIGHT_SHIFT(long, c, b)) {
if (PyErr_Warn(PyExc_DeprecationWarning,
"x<<y losing bits or changing sign "
"will return a long in Python 2.4 and up") < 0)
return NULL;
}
c = (long)((unsigned long)a << b);
return PyInt_FromLong(c);
}