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/*
Copyright (C) 2014 Alex J. Best
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz_mat.h"
void
fmpz_mat_hnf(fmpz_mat_t H, const fmpz_mat_t A)
{
slong m = A->r, b = fmpz_mat_max_bits(A), cutoff = 2;
if (b < 0)
b = -b;
if (b <= 2)
cutoff = 52;
else if (b <= 4)
cutoff = 38;
else if (b <= 8)
cutoff = 30;
else if (b <= 16)
cutoff = 11;
else if (b <= 32)
cutoff = 11;
else if (b <= 64)
cutoff = 5;
else if (b <= 128)
cutoff = 4;
else if (b <= 512)
cutoff = 3;
/*
TODO: we should call Micciancio-Warisnchi or Pauderis-Storjohann
when implemented
*/
if (m < cutoff)
fmpz_mat_hnf_classical(H, A);
else {
flint_rand_t state;
flint_rand_init(state);
fmpz_mat_hnf_pernet_stein(H, A, state);
flint_rand_clear(state);
}
}