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/*
Copyright (C) 2016 Elias Tsigaridas
Copyright (C) 2017 Vincent Delecroix
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 "fmpz.h"
#include "fmpz_poly.h"
slong _fmpz_poly_remove_content_2exp(fmpz * pol, slong len)
{
slong cont, i, z;
i = 0;
while (i < len && fmpz_is_zero(pol + i))
i++;
if (i == len)
return 0;
cont = fmpz_val2(pol + i);
for ( ; (i < len) && cont; i++)
{
if (!fmpz_is_zero(pol + i))
{
z = fmpz_val2(pol + i);
if (z < cont)
cont = z;
}
}
if (cont == 0)
return 0;
for (i = 0; i < len; i++)
fmpz_fdiv_q_2exp(pol + i, pol + i, cont);
return cont;
}