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Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpz/get_si.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_get_si(integer) -- Return the least significant digit from INTEGER.
                      2:
                      3: Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Library General Public License as published by
                      9: the Free Software Foundation; either version 2 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Library General Public License
                     18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24:
                     25: signed long int
                     26: #if __STDC__
                     27: mpz_get_si (mpz_srcptr op)
                     28: #else
                     29: mpz_get_si (op)
                     30:      mpz_srcptr op;
                     31: #endif
                     32: {
                     33:   mp_size_t size = op->_mp_size;
                     34:   mp_limb_t low_limb = op->_mp_d[0];
                     35:
                     36:   if (size > 0)
                     37:     return low_limb % ((mp_limb_t) 1 << (BITS_PER_MP_LIMB - 1));
                     38:   else if (size < 0)
                     39:     /* This convoluted expression is necessary to properly handle 0x80000000 */
                     40:     return ~((low_limb - 1) % ((mp_limb_t) 1 << (BITS_PER_MP_LIMB - 1)));
                     41:   else
                     42:     return 0;
                     43: }