#11705: Port Sage to SUSE Linux Power 7 (ppc64).
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Reporter: was | Owner: drkirkby
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.0
Component: porting | Resolution:
Keywords: sd32 sd35.5 | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by zimmerma):
I believe I understand what happens. The fact that {{{__pyx_t_3}}} has the
wrong type is not a problem,
since it is a pointer, like what {{{mpz_t}}} expects as 2nd (and 3rd)
argument of {{{mpfi_interv_z}}}.
However my guess is that the {{{__Pyx_INCREF(__pyx_t_3)}}} call is
intended to increase a reference counter stored somewhere in the
{{{PyObject}}} struct. Since {{{__pyx_v_integ->value}}} is not a Python
object but a {{{mpz_t}}}, this call makes a side effect on the {{{mpz_t}}}
structure, which has the
effect to increase its "size" from 1 to 2, which explains why the
{{{mpz_t}}} object seen by
{{{mpfi_interv_z}}} is corrupted.
What is annoying is that this corruption **also happens** on other
configurations (in particular
little endian). For some reason it gets unnoticed, maybe because the
corrupted field is not the size
(maybe the allocated size). However one might be able to reproduce the
problem also by changing the
order of the fields in the {{{mpz_t}}} structure in {{{gmp.h}}}. Putting
{{{_mp_size}}} first seems to
break Sage on 64-bit Intel processors.
Paul
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11705#comment:68>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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