1 /*
2 Copyright (C) 2013 Fredrik Johansson
3
4 This file is part of Arb.
5
6 Arb is free software: you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version. See <http://www.gnu.org/licenses/>.
10 */
11
12 #include "acb_poly.h"
13
14 void
_acb_poly_pow_ui(acb_ptr res,acb_srcptr f,slong flen,ulong exp,slong prec)15 _acb_poly_pow_ui(acb_ptr res, acb_srcptr f, slong flen, ulong exp, slong prec)
16 {
17 _acb_poly_pow_ui_trunc_binexp(res, f, flen, exp, exp * (flen - 1) + 1, prec);
18 }
19
20 void
acb_poly_pow_ui(acb_poly_t res,const acb_poly_t poly,ulong exp,slong prec)21 acb_poly_pow_ui(acb_poly_t res,
22 const acb_poly_t poly, ulong exp, slong prec)
23 {
24 slong flen, rlen;
25
26 flen = poly->length;
27
28 if (exp == 0)
29 {
30 acb_poly_one(res);
31 }
32 else if (flen == 0)
33 {
34 acb_poly_zero(res);
35 }
36 else
37 {
38 rlen = exp * (flen - 1) + 1;
39
40 if (res != poly)
41 {
42 acb_poly_fit_length(res, rlen);
43 _acb_poly_pow_ui(res->coeffs,
44 poly->coeffs, flen, exp, prec);
45 _acb_poly_set_length(res, rlen);
46 _acb_poly_normalise(res);
47 }
48 else
49 {
50 acb_poly_t t;
51 acb_poly_init2(t, rlen);
52 _acb_poly_pow_ui(t->coeffs,
53 poly->coeffs, flen, exp, prec);
54 _acb_poly_set_length(t, rlen);
55 _acb_poly_normalise(t);
56 acb_poly_swap(res, t);
57 acb_poly_clear(t);
58 }
59 }
60 }
61
62