Mercurial > cpython-lru_cache-weakref
diff Objects/object.c @ 51469:224d0efcbf6c
Merged revisions 69436 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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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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| author | Mark Dickinson <dickinsm@gmail.com> |
|---|---|
| date | Sun, 08 Feb 2009 15:09:21 +0000 |
| parents | debd14c489b9 |
| children | ff096d6a9222 |
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--- a/Objects/object.c Sun Feb 08 15:00:52 2009 +0000 +++ b/Objects/object.c Sun Feb 08 15:09:21 2009 +0000 @@ -655,7 +655,7 @@ 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))