1 /*
2 Copyright (C) 2011 Fredrik Johansson
3
4 This file is part of FLINT.
5
6 FLINT 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 <stdlib.h>
13 #include "flint.h"
14 #include "fmpz_poly.h"
15 #include "fmpz_poly_mat.h"
16 #include "fmpz_mat.h"
17
18 void
fmpz_poly_mat_sqr_KS(fmpz_poly_mat_t B,const fmpz_poly_mat_t A)19 fmpz_poly_mat_sqr_KS(fmpz_poly_mat_t B, const fmpz_poly_mat_t A)
20 {
21 fmpz_mat_t AA, BB;
22 slong i, j, n;
23 slong A_len;
24 int signs;
25 slong A_bits, bit_size;
26
27 n = A->r;
28
29 if (n == 0)
30 {
31 fmpz_poly_mat_zero(B);
32 return;
33 }
34
35 A_len = fmpz_poly_mat_max_length(A);
36 A_bits = fmpz_poly_mat_max_bits(A);
37
38 signs = A_bits < 0;
39
40 bit_size = 2 * FLINT_ABS(A_bits) + signs;
41 bit_size += FLINT_BIT_COUNT(A_len);
42 bit_size += FLINT_BIT_COUNT(n);
43
44 fmpz_mat_init(AA, n, n);
45 fmpz_mat_init(BB, n, n);
46
47 for (i = 0; i < n; i++)
48 for (j = 0; j < n; j++)
49 fmpz_poly_bit_pack(fmpz_mat_entry(AA, i, j),
50 fmpz_poly_mat_entry(A, i, j), bit_size);
51
52 /* Should use fmpz_mat_sqr */
53 fmpz_mat_mul(BB, AA, AA);
54
55 for (i = 0; i < n; i++)
56 for (j = 0; j < n; j++)
57 if (signs)
58 fmpz_poly_bit_unpack(fmpz_poly_mat_entry(B, i, j),
59 fmpz_mat_entry(BB, i, j), bit_size);
60 else
61 fmpz_poly_bit_unpack_unsigned(fmpz_poly_mat_entry(B, i, j),
62 fmpz_mat_entry(BB, i, j), bit_size);
63
64 fmpz_mat_clear(AA);
65 fmpz_mat_clear(BB);
66 }
67