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More bug 460020. Disable a number of long optimizations for long subclasses.

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This commit is contained in:
Tim Peters 2001-09-11 22:31:33 +00:00
parent 0280cf79a7
commit 69c2de3ad6
2 changed files with 39 additions and 18 deletions
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24
Lib/test/test_descr.py
View file

@ -1389,6 +1389,30 @@ def inherits():
a = octlong(12345) a = octlong(12345)
verify(long(a) == 12345L) verify(long(a) == 12345L)
verify(long(a).__class__ is long) verify(long(a).__class__ is long)
verify((+a).__class__ is long)
verify((-a).__class__ is long)
verify((-octlong(0)).__class__ is long)
verify((a >> 0).__class__ is long)
verify((a << 0).__class__ is long)
verify((a - 0).__class__ is long)
verify((a * 1).__class__ is long)
verify((a ** 1).__class__ is long)
verify((a // 1).__class__ is long)
verify((1 * a).__class__ is long)
verify((a | 0).__class__ is long)
verify((a ^ 0).__class__ is long)
verify((a & -1L).__class__ is long)
verify((octlong(0) << 12).__class__ is long)
verify((octlong(0) >> 12).__class__ is long)
verify(abs(octlong(0)).__class__ is long)
# Because octlong overrides __add__, we can't check the absence of +0
# optimizations using octlong.
class longclone(long):
pass
a = longclone(1)
verify((a + 0).__class__ is long)
verify((0 + a).__class__ is long)
class precfloat(float): class precfloat(float):
__slots__ = ['prec'] __slots__ = ['prec']

27
Objects/longobject.c
View file

@ -1820,27 +1820,26 @@ long_invert(PyLongObject *v)
static PyObject * static PyObject *
long_pos(PyLongObject *v) long_pos(PyLongObject *v)
{ {
Py_INCREF(v); if (PyLong_CheckExact(v)) {
return (PyObject *)v; Py_INCREF(v);
return (PyObject *)v;
}
else
return _PyLong_Copy(v);
} }
static PyObject * static PyObject *
long_neg(PyLongObject *v) long_neg(PyLongObject *v)
{ {
PyLongObject *z; PyLongObject *z;
int i, n; if (v->ob_size == 0 && PyLong_CheckExact(v)) {
n = ABS(v->ob_size);
if (n == 0) {
/* -0 == 0 */ /* -0 == 0 */
Py_INCREF(v); Py_INCREF(v);
return (PyObject *) v; return (PyObject *) v;
} }
z = _PyLong_New(ABS(n)); z = (PyLongObject *)_PyLong_Copy(v);
if (z == NULL) if (z != NULL)
return NULL; z->ob_size = -(v->ob_size);
for (i = 0; i < n; i++)
z->ob_digit[i] = v->ob_digit[i];
z->ob_size = -(v->ob_size);
return (PyObject *)z; return (PyObject *)z;
} }
@ -1849,10 +1848,8 @@ long_abs(PyLongObject *v)
{ {
if (v->ob_size < 0) if (v->ob_size < 0)
return long_neg(v); return long_neg(v);
else { else
Py_INCREF(v); return long_pos(v);
return (PyObject *)v;
}
} }
static int static int