65 lines
2.0 KiB
C
65 lines
2.0 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) 2009 William Hart
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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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void
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fmpz_set_mpz(fmpz_t f, const mpz_t x)
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{
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slong size = (slong) x->_mp_size;
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if (size == WORD(0)) /* x is zero */
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{
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fmpz_zero(f);
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}
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else if (size == WORD(1)) /* x is positive and 1 limb */
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{
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fmpz_set_ui(f, flint_mpz_get_ui(x));
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}
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else if (size == WORD(-1)) /* x is negative and 1 limb */
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{
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ulong uval = flint_mpz_get_ui(x);
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if (uval <= COEFF_MAX) /* x is small */
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{
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_fmpz_demote(f);
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*f = -uval;
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}
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else /* x is large but one limb */
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{
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__mpz_struct *mpz_ptr = _fmpz_promote(f);
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flint_mpz_set_ui(mpz_ptr, uval);
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mpz_neg(mpz_ptr, mpz_ptr);
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}
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}
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else /* x is more than one limb */
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{
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__mpz_struct *mpz_ptr = _fmpz_promote(f);
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mpz_set(mpz_ptr, x);
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}
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}
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