1 /*
2 Copyright (C) 2012 Lina Kulakova
3 Copyright (C) 2013 Mike Hansen
4
5 This file is part of FLINT.
6
7 FLINT is free software: you can redistribute it and/or modify it under
8 the terms of the GNU Lesser General Public License (LGPL) as published
9 by the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version. See <http://www.gnu.org/licenses/>.
11 */
12
13 #ifdef T
14
15 #include "templates.h"
16
17 #include <math.h>
18
19 void
TEMPLATE(T,poly_factor_kaltofen_shoup)20 TEMPLATE(T, poly_factor_kaltofen_shoup) (TEMPLATE(T, poly_factor_t) res,
21 const TEMPLATE(T, poly_t) poly,
22 const TEMPLATE(T, ctx_t) ctx)
23 {
24 TEMPLATE(T, poly_t) v;
25 TEMPLATE(T, poly_factor_t) sq_free, dist_deg;
26 slong i, j, k, l, res_num, dist_deg_num;
27 slong *degs;
28
29 if (!
30 (degs =
31 flint_malloc(TEMPLATE(T, poly_degree) (poly, ctx) * sizeof(slong))))
32 {
33 TEMPLATE_PRINTF("Exception (%s_poly_factor_kaltofen_shoup): \n", T);
34 flint_printf("Not enough memory.\n");
35 flint_abort();
36 }
37
38 TEMPLATE(T, poly_init) (v, ctx);
39
40 TEMPLATE(T, poly_make_monic) (v, poly, ctx);
41
42 /* compute squarefree factorisation */
43 TEMPLATE(T, poly_factor_init) (sq_free, ctx);
44 TEMPLATE(T, poly_factor_squarefree) (sq_free, v, ctx);
45
46 /* compute distinct-degree factorisation */
47 TEMPLATE(T, poly_factor_init) (dist_deg, ctx);
48 for (i = 0; i < sq_free->num; i++)
49 {
50 dist_deg_num = dist_deg->num;
51
52 TEMPLATE(T, poly_factor_distinct_deg) (dist_deg, sq_free->poly + i,
53 °s, ctx);
54
55 /* compute equal-degree factorisation */
56 for (j = dist_deg_num, l = 0; j < dist_deg->num; j++, l++)
57 {
58 res_num = res->num;
59
60 TEMPLATE(T, poly_factor_equal_deg) (res, dist_deg->poly + j,
61 degs[l], ctx);
62 for (k = res_num; k < res->num; k++)
63 res->exp[k] = TEMPLATE(T, poly_remove) (v, res->poly + k, ctx);
64 }
65 }
66
67 flint_free(degs);
68 TEMPLATE(T, poly_clear) (v, ctx);
69 TEMPLATE(T, poly_factor_clear) (dist_deg, ctx);
70 TEMPLATE(T, poly_factor_clear) (sq_free, ctx);
71 }
72
73
74 #endif
75