#11986: inconsistent integer hashing on 64bit systems with python 2.7
-----------------------------+----------------------------------------------
Reporter: fbissey | Owner: jdemeyer
Type: PLEASE CHANGE | Status: new
Priority: major | Milestone: sage-4.7.3
Component: c_lib | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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With python 2.7 integer hashing is broken on 64bit systems in a similar
way than [
http://trac.sagemath.org/sage_trac/ticket/4957#comment:3] in #4957 which
was fixed 3 years ago. The following tests
{{{
sage -t -long -force_lib "devel/sage-
main/sage/rings/padics/padic_capped_relative_element.pyx"
**********************************************************************
File "/usr/share/sage/devel/sage-
main/sage/rings/padics/padic_capped_relative_element.pyx", line 2339:
sage: hash(R(-1))
Expected:
95367431640624
Got:
1977800240
**********************************************************************
}}}
and (which is reminiscent of #4957):
{{{
sage -t -long -force_lib "devel/sage-main/sage/rings/integer.pyx"
**********************************************************************
File "/usr/share/sage/devel/sage-main/sage/rings/integer.pyx", line 3046:
sage: n = -920390823904823094890238490238484; n.__hash__()
Expected:
6874330978542788722
Got:
-2623069716
**********************************************************************
File "/usr/share/sage/devel/sage-main/sage/rings/integer.pyx", line 3061:
sage: hash(n)
Expected:
-9223372036854767616
Got:
8192
**********************************************************************
File "/usr/share/sage/devel/sage-main/sage/rings/integer.pyx", line 3064:
sage: hash(n) == hash(int(n))
Expected:
True
Got:
False
**********************************************************************
}}}
On my 64bit system with python-2.7:
{{{
sage: n=2^63+2^13
sage: n
9223372036854784000
sage: hash(n)
8192
sage: int(n)
9223372036854784000L
sage: hash(int(n))
-9223372036854767616
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11986>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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