#11611: Equal PARI integers have different hashes
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Reporter: jdemeyer | Owner: jdemeyer
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.2
Component: number fields | Keywords: pari cgetg integer ideal hnf
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Changes (by jdemeyer):
* keywords: pari integer ideal hnf => pari cgetg integer ideal hnf
Old description:
> In the code below, `a5` and `b5` are PARI integers equal to 5 but they
> have different hashes:
>
> {{{
> sage: pariK=pari("nfinit(x^2-x-1)"); b5 = pari(5); b5.debug(); a5 =
> pari(5); a5.debug(); print a5.__hash__(), b5.__hash__()
> [&=00000000049437b0] INT(lg=3):0200000000000003
> (+,lgefint=3):4000000000000003 0000000000000005
> [&=000000000493cfe0] INT(lg=3):0200000000000003
> (+,lgefint=3):7000000000000003 0000000000000005
> -1729382256910270461 -8646911284551352317
> }}}
>
> This bug was discovered for ideals having different hashes.
New description:
In the code below, `a5` and `b5` are PARI integers equal to 5 but they
have different hashes:
{{{
sage: pariK=pari("nfinit(x^2-x-1)"); b5 = pari(5); b5.debug(); a5 =
pari(5); a5.debug(); print a5.__hash__(), b5.__hash__()
[&=00000000049437b0] INT(lg=3):0200000000000003
(+,lgefint=3):4000000000000003 0000000000000005
[&=000000000493cfe0] INT(lg=3):0200000000000003
(+,lgefint=3):7000000000000003 0000000000000005
-1729382256910270461 -8646911284551352317
}}}
This bug was discovered for ideals having different hashes.
The problem is with the initialization of integers in
`new_gen_from_mpz_t()`. The attached patch fixes various instances of bad
PARI object initialization.
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11611#comment:5>
Sage <http://www.sagemath.org>
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