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/*
Copyright (C) 2012 Fredrik Johansson
This file is part of Arb.
Arb 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 "arb_poly.h"
void _arb_poly_mul(arb_ptr C,
arb_srcptr A, slong lenA,
arb_srcptr B, slong lenB, slong prec)
{
_arb_poly_mullow(C, A, lenA, B, lenB, lenA + lenB - 1, prec);
}
void
arb_poly_mul(arb_poly_t res, const arb_poly_t poly1,
const arb_poly_t poly2, slong prec)
{
slong len_out;
if ((poly1->length == 0) || (poly2->length == 0))
{
arb_poly_zero(res);
return;
}
len_out = poly1->length + poly2->length - 1;
if (res == poly1 || res == poly2)
{
arb_poly_t temp;
arb_poly_init2(temp, len_out);
_arb_poly_mul(temp->coeffs, poly1->coeffs, poly1->length,
poly2->coeffs, poly2->length, prec);
arb_poly_swap(res, temp);
arb_poly_clear(temp);
}
else
{
arb_poly_fit_length(res, len_out);
_arb_poly_mul(res->coeffs, poly1->coeffs, poly1->length,
poly2->coeffs, poly2->length, prec);
}
_arb_poly_set_length(res, len_out);
_arb_poly_normalise(res);
}
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