55 lines
1.6 KiB
C
55 lines
1.6 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 "ulong_extras.h"
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#include "fmpz.h"
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#if FLINT64 /* 2^53 */
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#define DOUBLE_MAX 9007199254740992.0
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#define DOUBLE_MIN -9007199254740992.0
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#else
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#define DOUBLE_MAX COEFF_MAX
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#define DOUBLE_MIN COEFF_MIN
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#endif
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void
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fmpz_set_d(fmpz_t f, double c)
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{
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if (c >= DOUBLE_MIN && c <= DOUBLE_MAX)
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{
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_fmpz_demote(f);
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/* guaranteed to fit, since c gets truncated */
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*f = (slong) c;
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}
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else
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{
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__mpz_struct * z = _fmpz_promote(f);
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mpz_set_d(z, c);
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_fmpz_demote_val(f);
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}
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}
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