93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* int mpz_fits_X_p (mpz_t z) -- test whether z fits signed type X.
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Copyright 1997, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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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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#if defined(_WIN64)
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#define FLINT_UI_MAX ((mp_limb_t)(~(mp_limb_t)0))
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#define FLINT_UI_HIBIT (FLINT_UI_MAX ^ (FLINT_UI_MAX >> 1))
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#define FLINT_SI_MAX ((mp_limb_signed_t)(FLINT_UI_MAX ^ FLINT_UI_HIBIT))
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#define FLINT_SI_MIN ((mp_limb_signed_t)FLINT_UI_HIBIT)
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int
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flint_mpz_fits_si_p(mpz_srcptr z)
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{
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mp_size_t n = z->_mp_size;
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mp_ptr p = z->_mp_d;
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mp_limb_t limb = p[0];
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if (n == 0)
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return 1;
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if (n == 1)
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return limb <= FLINT_SI_MAX;
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if (n == -1)
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return limb <= - (mp_limb_t) FLINT_SI_MIN;
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return 0;
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}
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#endif
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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 Sebastian Pancratz
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Copyright (C) 2013 William Hart
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******************************************************************************/
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int fmpz_fits_si(const fmpz_t f)
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{
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if (!COEFF_IS_MPZ(*f))
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{
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return 1;
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}
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else
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{
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#if defined(_WIN64)
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return flint_mpz_fits_si_p(COEFF_TO_PTR(*f));
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#else
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return mpz_fits_slong_p(COEFF_TO_PTR(*f));
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#endif
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}
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}
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