Overflow error in conversion Integer -> FiniteFieldElement_pari_ffelt

[pjbruin]

As reported by Samuel Neves on sage-support, the following raises a PARI error due to an overflow in converting from t_INT to long:

p = previous_prime(2^64)
F.<x> = GF(p^2)
x * 2**63

The problem is that the conversion is done using PARI's itos (t_INT to signed long) instead of itou (t_INT to unsigned long).

Component: finite rings

Keywords: pari overflow

Author: Peter Bruin

Branch/Commit: 596fc84

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/16807

[pjbruin]

Commit: 596fc84

[pjbruin]

Branch: u/pbruin/16807-finite_field_overflow

[jdemeyer]

Reviewer: Jeroen Demeyer

[vbraun]

Changed branch from u/pbruin/16807-finite_field_overflow to 596fc84