mirror of
https://github.com/vale981/arb
synced 2025-03-04 17:01:40 -05:00
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*
|
|
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);
|
|
}
|