81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*=============================================================================
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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) 2010 Sebastian Pancratz
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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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void _fmpz_poly_pseudo_div(fmpz * Q, ulong * d, const fmpz * A, slong lenA,
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const fmpz * B, slong lenB, const fmpz_preinvn_t inv)
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{
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fmpz * R = _fmpz_vec_init(lenA);
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_fmpz_poly_pseudo_divrem(Q, R, d, A, lenA, B, lenB, inv);
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_fmpz_vec_clear(R, lenA);
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}
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void fmpz_poly_pseudo_div(fmpz_poly_t Q, ulong * d, const fmpz_poly_t A,
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const fmpz_poly_t B)
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{
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slong lenq;
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fmpz * q;
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if (B->length == 0)
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{
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flint_printf("Exception (fmpz_poly_pseudo_div). Division by zero.\n");
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abort();
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}
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if (A->length < B->length)
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{
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fmpz_poly_zero(Q);
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*d = 0;
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return;
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}
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lenq = A->length - B->length + 1;
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if (Q == A || Q == B)
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q = _fmpz_vec_init(lenq);
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else
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{
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fmpz_poly_fit_length(Q, lenq);
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q = Q->coeffs;
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}
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_fmpz_poly_pseudo_div(q, d, A->coeffs, A->length,
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B->coeffs, B->length, NULL);
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if (Q == A || Q == B)
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{
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_fmpz_vec_clear(Q->coeffs, Q->alloc);
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Q->coeffs = q;
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Q->alloc = lenq;
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Q->length = lenq;
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}
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else
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_fmpz_poly_set_length(Q, lenq);
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}
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