71 lines
2.1 KiB
C
71 lines
2.1 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) 2010 Sebastian Pancratz
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******************************************************************************/
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#include <stdio.h>
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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 "ulong_extras.h"
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#include "fmpz.h"
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void
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fmpz_fdiv_q_si(fmpz_t f, const fmpz_t g, slong h)
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{
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fmpz c1 = *g;
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slong c2 = h;
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if (h == 0)
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{
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flint_printf("Exception (fmpq_fdiv_q_si). Division by zero.\n");
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abort();
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}
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if (!COEFF_IS_MPZ(c1)) /* g is small */
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{
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fmpz q = c1 / c2; /* compute C quotient */
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fmpz r = c1 - c2 * q; /* compute remainder */
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if (r && ((c1 ^ c2) < 0))
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--q;
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fmpz_set_si(f, q);
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}
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else /* g is large */
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{
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__mpz_struct *mpz_ptr = _fmpz_promote(f);
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if (c2 > 0)
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{
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flint_mpz_fdiv_q_ui(mpz_ptr, COEFF_TO_PTR(c1), c2);
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}
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else
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{
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flint_mpz_cdiv_q_ui(mpz_ptr, COEFF_TO_PTR(c1), -(ulong) c2);
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mpz_neg(mpz_ptr, mpz_ptr);
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}
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_fmpz_demote_val(f); /* division by h may result in small value */
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}
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}
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