85 lines
2.8 KiB
C
85 lines
2.8 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) 2008-2011 William Hart
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******************************************************************************/
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#include <stdlib.h>
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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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#include "fmpz_poly.h"
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#include "fft.h"
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void _fmpz_vec_set_fft(fmpz * coeffs_m, slong length,
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const mp_ptr * coeffs_f, slong limbs, slong sign)
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{
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slong i, size;
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mp_limb_t * data;
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__mpz_struct * mpz_ptr;
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if (sign)
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{
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for (i = 0; i < length; i++)
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{
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mpz_ptr = _fmpz_promote(coeffs_m);
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if (mpz_ptr->_mp_alloc < limbs) _mpz_realloc(mpz_ptr, limbs);
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data = mpz_ptr->_mp_d;
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if ((coeffs_f[i][limbs - 1] >> (FLINT_BITS - 1)) || coeffs_f[i][limbs])
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{
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mpn_neg_n(data, coeffs_f[i], limbs);
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mpn_add_1(data, data, limbs, WORD(1));
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size = limbs;
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while ((size) && (data[size - 1] == 0)) size--; /* normalise */
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mpz_ptr->_mp_size = -size;
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if (size >= WORD(-1)) _fmpz_demote_val(coeffs_m); /* coefficient may be small*/
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} else
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{
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flint_mpn_copyi(data, coeffs_f[i], limbs);
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size = limbs;
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while ((size) && (data[size - 1] == WORD(0))) size--; /* normalise */
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mpz_ptr->_mp_size = size;
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if (size <= 1) _fmpz_demote_val(coeffs_m); /* coefficient may be small */
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}
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coeffs_m++;
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}
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} else
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{
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for (i = 0; i < length; i++)
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{
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mpz_ptr = _fmpz_promote(coeffs_m);
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if (mpz_ptr->_mp_alloc < limbs) _mpz_realloc(mpz_ptr, limbs);
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data = mpz_ptr->_mp_d;
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flint_mpn_copyi(data, coeffs_f[i], limbs);
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size = limbs;
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while ((size) && (data[size - 1] == WORD(0))) size--; /* normalise */
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mpz_ptr->_mp_size = size;
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if (size <= 1) _fmpz_demote_val(coeffs_m); /* coefficient may be small */
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coeffs_m++;
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}
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}
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}
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