Merged revisions 69433,69436 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r69433 | mark.dickinson | 2009-02-08 13:58:10 +0000 (Sun, 08 Feb 2009) | 2 lines
Remove redundant assignment in _PyObject_LengthHint
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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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diff --git a/Objects/object.c b/Objects/object.c
index 7b82db9..daee6fb 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -1023,7 +1023,7 @@
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))