81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011 Fredrik Johansson
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******************************************************************************/
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#include <stdlib.h>
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#include "flint.h"
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#include "fmpz_poly.h"
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#include "fmpz_poly_mat.h"
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#include "fmpz_mat.h"
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void
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fmpz_poly_mat_sqr_KS(fmpz_poly_mat_t B, const fmpz_poly_mat_t A)
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{
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fmpz_mat_t AA, BB;
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slong i, j, n;
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slong A_len;
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int signs;
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slong A_bits, bit_size;
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n = A->r;
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if (n == 0)
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{
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fmpz_poly_mat_zero(B);
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return;
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}
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A_len = fmpz_poly_mat_max_length(A);
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A_bits = fmpz_poly_mat_max_bits(A);
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signs = A_bits < 0;
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bit_size = 2 * FLINT_ABS(A_bits) + signs;
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bit_size += FLINT_BIT_COUNT(A_len);
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bit_size += FLINT_BIT_COUNT(n);
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fmpz_mat_init(AA, n, n);
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fmpz_mat_init(BB, n, n);
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for (i = 0; i < n; i++)
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for (j = 0; j < n; j++)
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fmpz_poly_bit_pack(fmpz_mat_entry(AA, i, j),
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fmpz_poly_mat_entry(A, i, j), bit_size);
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/* Should use fmpz_mat_sqr */
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fmpz_mat_mul(BB, AA, AA);
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for (i = 0; i < n; i++)
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for (j = 0; j < n; j++)
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if (signs)
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fmpz_poly_bit_unpack(fmpz_poly_mat_entry(B, i, j),
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fmpz_mat_entry(BB, i, j), bit_size);
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else
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fmpz_poly_bit_unpack_unsigned(fmpz_poly_mat_entry(B, i, j),
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fmpz_mat_entry(BB, i, j), bit_size);
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fmpz_mat_clear(AA);
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fmpz_mat_clear(BB);
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}
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