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/*
Copyright (C) 2020 Fredrik Johansson
This file is part of Calcium.
Calcium 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 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "ca_poly.h"
void
_ca_poly_sub(ca_ptr res, ca_srcptr poly1, slong len1,
ca_srcptr poly2, slong len2, ca_ctx_t ctx)
{
slong i, min = FLINT_MIN(len1, len2);
for (i = 0; i < min; i++)
ca_sub(res + i, poly1 + i, poly2 + i, ctx);
for (i = min; i < len1; i++)
ca_set(res + i, poly1 + i, ctx);
for (i = min; i < len2; i++)
ca_neg(res + i, poly2 + i, ctx);
}
void
ca_poly_sub(ca_poly_t res, const ca_poly_t poly1,
const ca_poly_t poly2, ca_ctx_t ctx)
{
slong max = FLINT_MAX(poly1->length, poly2->length);
ca_poly_fit_length(res, max, ctx);
_ca_poly_sub(res->coeffs, poly1->coeffs, poly1->length, poly2->coeffs,
poly2->length, ctx);
_ca_poly_set_length(res, max, ctx);
_ca_poly_normalise(res, ctx);
}
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