pqc/external/flint-2.4.3/fmpz_poly_mat/mul_KS.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2011 Fredrik Johansson
******************************************************************************/
#include <stdlib.h>
#include "flint.h"
#include "fmpz_poly.h"
#include "fmpz_poly_mat.h"
#include "fmpz_mat.h"
void
fmpz_poly_mat_mul_KS(fmpz_poly_mat_t C, const fmpz_poly_mat_t A,
const fmpz_poly_mat_t B)
{
slong i, j;
slong A_len, B_len;
int signs;
slong A_bits, B_bits, bit_size;
fmpz_mat_t AA, BB, CC;
if (B->r == 0)
{
fmpz_poly_mat_zero(C);
return;
}
A_len = fmpz_poly_mat_max_length(A);
B_len = fmpz_poly_mat_max_length(B);
A_bits = fmpz_poly_mat_max_bits(A);
B_bits = fmpz_poly_mat_max_bits(B);
signs = (A_bits < 0 || B_bits < 0);
bit_size = FLINT_ABS(A_bits) + FLINT_ABS(B_bits) + signs;
bit_size += FLINT_BIT_COUNT(FLINT_MIN(A_len, B_len));
bit_size += FLINT_BIT_COUNT(B->r);
/*
flint_printf("A: BITS %wd LEN %wd\n", A_bits, A_len);
flint_printf("B: BITS %wd LEN %wd\n", B_bits, B_len);
flint_printf("bit_size: %wd\n", bit_size);
*/
fmpz_mat_init(AA, A->r, A->c);
fmpz_mat_init(BB, B->r, B->c);
fmpz_mat_init(CC, C->r, C->c);
for (i = 0; i < A->r; i++)
for (j = 0; j < A->c; j++)
fmpz_poly_bit_pack(fmpz_mat_entry(AA, i, j),
fmpz_poly_mat_entry(A, i, j), bit_size);
for (i = 0; i < B->r; i++)
for (j = 0; j < B->c; j++)
fmpz_poly_bit_pack(fmpz_mat_entry(BB, i, j),
fmpz_poly_mat_entry(B, i, j), bit_size);
fmpz_mat_mul(CC, AA, BB);
for (i = 0; i < C->r; i++)
for (j = 0; j < C->c; j++)
if (signs)
fmpz_poly_bit_unpack(fmpz_poly_mat_entry(C, i, j),
fmpz_mat_entry(CC, i, j), bit_size);
else
fmpz_poly_bit_unpack_unsigned(fmpz_poly_mat_entry(C, i, j),
fmpz_mat_entry(CC, i, j), bit_size);
fmpz_mat_clear(AA);
fmpz_mat_clear(BB);
fmpz_mat_clear(CC);
}