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Merged revisions 69433,69436 via svnmerge from 

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r69433 | mark.dickinson | 2009-02-08 13:58:10 +0000 (Sun, 08 Feb 2009) | 2 lines

  Remove redundant assignment in _PyObject_LengthHint
........
  r69436 | mark.dickinson | 2009-02-08 14:42:28 +0000 (Sun, 08 Feb 2009) | 10 lines

  Issue #789290: make sure that hash(2**63) == hash(2.**63) on 64-bit
  platforms.  The previous code was fragile, depending on the twin
  accidents that:

    (1) in C, casting the double value 2.**63 to long returns the integer
        value -2**63, and
    (2) in Python, hash(-2**63) == hash(2**63).

  There's already a test for this in test_hash.
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This commit is contained in:
Mark Dickinson 2009-02-08 14:56:08 +00:00
parent 1e2ea82926
commit dd0989e7df
2 changed files with 2 additions and 2 deletions
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2
Objects/abstract.c
View File

@ -123,7 +123,7 @@ _PyObject_LengthHint(PyObject *o, Py_ssize_t defaultvalue)
PyErr_Clear();
return defaultvalue;
}
rv = rv = PyLong_Check(ro) ? PyLong_AsSsize_t(ro) : defaultvalue;
rv = PyLong_Check(ro) ? PyLong_AsSsize_t(ro) : defaultvalue;
Py_DECREF(ro);
return rv;
}

2
Objects/object.c
View File

@ -1023,7 +1023,7 @@ _Py_HashDouble(double v)
fractpart = modf(v, &intpart);
if (fractpart == 0.0) {
/* This must return the same hash as an equal int or long. */
if (intpart > LONG_MAX || -intpart > LONG_MAX) {
if (intpart > LONG_MAX/2 || -intpart > LONG_MAX/2) {
/* Convert to long and use its hash. */
PyObject *plong; /* converted to Python long */
if (Py_IS_INFINITY(intpart))