#14888: Make FiniteField_pari_ffelt the default for generic finite fields
-------------------------------------+-------------------------------------
Reporter: pbruin | Owner: cpernet
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.13
Component: finite rings | Resolution:
Keywords: FiniteField | Merged in:
performance | Reviewers: Jean-Pierre Flori,
Authors: Peter Bruin | Jeroen Demeyer
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #12142, #15124, | Stopgaps:
#15125 |
-------------------------------------+-------------------------------------
Comment (by pbruin):
Replying to [comment:31 jdemeyer]:
> I agree that is a mistake, but on the other hand, we are not handling
any errors here, so the non-reentrant error handling code isn't called. So
that cannot explain the problem.
Probably true; the only sort of thing that I could imagine happening here
is that PARI runs out of stack space, the call has to be restarted, and
the error handler does a `longjmp()` to the wrong stack frame. However,
this can hardly be the problem, because nothing is using a lot of PARI
memory here.
> > In the line `ret = ret + c`, could you replace `c` by `base(c)`
> With that change, I no longer get the error (which unfortunately doesn't
imply that the bug is fixed).
Mysterious. I checked that the coercion system does exactly the same
thing internally, as it should (convert the Python int `c` to `pari_ffelt`
and then add this to `ret` in `base`), so there is no other intermediate
conversion that could go wrong.
--
Ticket URL: <http://trac.sagemath.org/ticket/14888#comment:32>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/groups/opt_out.
