pqc/external/flint-2.4.3/nmod_poly_mat/mul.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 "flint.h"
#include "nmod_poly.h"
#include "nmod_poly_mat.h"
#define KS_MIN_DIM 10
#define INTERPOLATE_MIN_DIM 60
#define KS_MAX_LENGTH 128
void
nmod_poly_mat_mul(nmod_poly_mat_t C, const nmod_poly_mat_t A,
const nmod_poly_mat_t B)
{
slong ar, bc, br, dim;
ar = A->r;
br = B->r;
bc = B->c;
dim = FLINT_MIN(FLINT_MIN(ar, br), bc);
if (dim < KS_MIN_DIM)
{
nmod_poly_mat_mul_classical(C, A, B);
}
else
{
slong Alen, Blen;
mp_limb_t mod = nmod_poly_mat_modulus(A);
Alen = nmod_poly_mat_max_length(A);
Blen = nmod_poly_mat_max_length(B);
if ((FLINT_BIT_COUNT(mod) > FLINT_BITS / 4)
&& (dim > INTERPOLATE_MIN_DIM + n_sqrt(FLINT_MIN(Alen, Blen)))
&& (mod >= Alen + Blen - 1) && n_is_prime(mod))
nmod_poly_mat_mul_interpolate(C, A, B);
else if (Alen > KS_MAX_LENGTH || Blen > KS_MAX_LENGTH)
nmod_poly_mat_mul_classical(C, A, B);
else
nmod_poly_mat_mul_KS(C, A, B);
}
}