#19280: MPIR gives incorrect result on 32-bit machines
-------------------------------------+-------------------------------------
Reporter: cheuberg | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: packages: | Resolution:
standard | Merged in:
Keywords: mpir | Reviewers:
Authors: Clemens Heuberger | Work issues:
Report Upstream: N/A | Commit:
Branch: u/cheuberg/mpir- | 0d48fb57205cb16d58380c9b022c39eb354c3a58
bug | Stopgaps:
Dependencies: |
-------------------------------------+-------------------------------------
Description changed by jdemeyer:
Old description:
> In [http://trac.sagemath.org/ticket/18546#comment:21 #18546], a bug in
> mpir only affecting i386 was described.
>
> {{{
> #include "mpir.h"
>
> int main()
> {
>
> mpz_t one, x, w;
> mpz_init(one);
> mpz_init(x);
> mpz_init(w);
> mpz_set_str(one,
> "62165404551223330269422781018352605012557018849668464680057997111644937126566671941632",
> 10);
> mpz_set_str(x, "39623752663112484341451587580", 10);
>
> mpz_tdiv_q(w, one, x);
> gmp_printf("%Zd\n", one, x, w);
>
> }
> }}}
> outputs 1568892406419848332919986945754866320479099155002496784035
> instead of the correct
> 1568892403497558507879962225846103176600476845510570267609.
New description:
In [http://trac.sagemath.org/ticket/18546#comment:21 #18546], a bug in
mpir only affecting 32 bit machines was described.
{{{
#include "mpir.h"
int main()
{
mpz_t one, x, w;
mpz_init(one);
mpz_init(x);
mpz_init(w);
mpz_set_str(one,
"62165404551223330269422781018352605012557018849668464680057997111644937126566671941632",
10);
mpz_set_str(x, "39623752663112484341451587580", 10);
mpz_tdiv_q(w, one, x);
gmp_printf("%Zd\n", one, x, w);
}
}}}
outputs 1568892406419848332919986945754866320479099155002496784035 instead
of the correct 1568892403497558507879962225846103176600476845510570267609.
--
--
Ticket URL: <http://trac.sagemath.org/ticket/19280#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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