96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*=============================================================================
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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_mul_KS(fmpz_poly_mat_t C, const fmpz_poly_mat_t A,
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const fmpz_poly_mat_t B)
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{
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slong i, j;
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slong A_len, B_len;
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int signs;
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slong A_bits, B_bits, bit_size;
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fmpz_mat_t AA, BB, CC;
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if (B->r == 0)
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{
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fmpz_poly_mat_zero(C);
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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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B_len = fmpz_poly_mat_max_length(B);
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A_bits = fmpz_poly_mat_max_bits(A);
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B_bits = fmpz_poly_mat_max_bits(B);
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signs = (A_bits < 0 || B_bits < 0);
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bit_size = FLINT_ABS(A_bits) + FLINT_ABS(B_bits) + signs;
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bit_size += FLINT_BIT_COUNT(FLINT_MIN(A_len, B_len));
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bit_size += FLINT_BIT_COUNT(B->r);
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/*
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flint_printf("A: BITS %wd LEN %wd\n", A_bits, A_len);
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flint_printf("B: BITS %wd LEN %wd\n", B_bits, B_len);
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flint_printf("bit_size: %wd\n", bit_size);
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*/
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fmpz_mat_init(AA, A->r, A->c);
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fmpz_mat_init(BB, B->r, B->c);
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fmpz_mat_init(CC, C->r, C->c);
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for (i = 0; i < A->r; i++)
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for (j = 0; j < A->c; 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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for (i = 0; i < B->r; i++)
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for (j = 0; j < B->c; j++)
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fmpz_poly_bit_pack(fmpz_mat_entry(BB, i, j),
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fmpz_poly_mat_entry(B, i, j), bit_size);
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fmpz_mat_mul(CC, AA, BB);
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for (i = 0; i < C->r; i++)
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for (j = 0; j < C->c; j++)
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if (signs)
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fmpz_poly_bit_unpack(fmpz_poly_mat_entry(C, i, j),
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fmpz_mat_entry(CC, i, j), bit_size);
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else
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fmpz_poly_bit_unpack_unsigned(fmpz_poly_mat_entry(C, i, j),
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fmpz_mat_entry(CC, i, j), bit_size);
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fmpz_mat_clear(AA);
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fmpz_mat_clear(BB);
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fmpz_mat_clear(CC);
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}
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