92 lines
2.4 KiB
C
92 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 <gmp.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "fmpz_vec.h"
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slong
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_fmpz_vec_max_bits(const fmpz * vec, slong len)
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{
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slong i, sign, max_limbs;
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mp_limb_t max_limb;
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mp_size_t limbs;
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sign = 1;
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max_limb = 0;
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for (i = 0; i < len; i++)
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{
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fmpz c = vec[i];
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if (c >= 0)
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{
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if (c > COEFF_MAX)
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goto bignum;
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max_limb |= c;
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}
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else
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{
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if (c < COEFF_MIN)
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goto bignum;
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max_limb |= -c;
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sign = -1;
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}
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}
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return sign * FLINT_BIT_COUNT(max_limb);
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bignum:
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max_limbs = 1;
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for ( ; i < len; i++)
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{
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fmpz c = vec[i];
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if (COEFF_IS_MPZ(c))
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{
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__mpz_struct * z = COEFF_TO_PTR(c);
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limbs = z->_mp_size;
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if (limbs < 0)
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{
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sign = -1;
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limbs = -limbs;
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}
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if (limbs == max_limbs)
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max_limb |= z->_mp_d[limbs - 1];
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else if (limbs > max_limbs)
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{
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max_limb = z->_mp_d[limbs - 1];
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max_limbs = limbs;
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}
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}
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else if (c < 0)
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sign = -1;
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}
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return sign * ((max_limbs - 1) * FLINT_BITS + FLINT_BIT_COUNT(max_limb));
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}
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