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/*
Copyright (C) 2022 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpzi.h"
void
fmpzi_gcd_euclidean(fmpzi_t res, const fmpzi_t X, const fmpzi_t Y)
{
fmpzi_t x, y, q, r;
if (fmpzi_is_zero(X))
{
fmpzi_canonicalise_unit(res, Y);
return;
}
if (fmpzi_is_zero(Y))
{
fmpzi_canonicalise_unit(res, X);
return;
}
fmpzi_init(x);
fmpzi_init(y);
fmpzi_init(q);
fmpzi_init(r);
fmpzi_set(x, X);
fmpzi_set(y, Y);
while (!fmpzi_is_zero(y))
{
fmpzi_divrem(q, r, x, y);
fmpzi_swap(x, y);
fmpzi_swap(y, r);
}
fmpzi_swap(res, x);
fmpzi_canonicalise_unit(res, res);
fmpzi_clear(x);
fmpzi_clear(y);
fmpzi_clear(q);
fmpzi_clear(r);
}