2011-06-08 03:15:12 -04:00
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/*
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mpz_get_sx(mpz z) -- return an intmax_t integer that is the corresponding
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least significant integer part of z, with the same sign as z.
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Copyright 2011 Brian Gladman
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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 "config.h"
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#include "mpir.h"
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#include "gmp-impl.h"
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#ifdef HAVE_STDINT_H
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#define NLIMBS ((8 * SIZEOF_UINTMAX_T + GMP_NUMB_BITS - 1) / GMP_NUMB_BITS)
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intmax_t
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mpz_get_sx (mpz_srcptr z)
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{
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#if NLIMBS == 1
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uintmax_t v = (intmax_t)(z->_mp_size ? z->_mp_d[0] : 0);
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#else
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uintmax_t v = 0, n = MIN(NLIMBS, ABS(z->_mp_size));
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while(n--)
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v = (v << GMP_NUMB_BITS) | z->_mp_d[n];
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#endif
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return z->_mp_size < 0 ? -v : v;
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}
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#endif
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