Return to set_d.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpz

Annotation of OpenXM_contrib/gmp/mpz/set_d.c, Revision 1.1.1.2

1.1       maekawa     1: /* mpz_set_d(integer, val) -- Assign INTEGER with a double value VAL.
                      2:
1.1.1.2 ! maekawa     3: Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc.
1.1       maekawa     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
1.1.1.2 ! maekawa     8: it under the terms of the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2 ! maekawa    14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    15: License for more details.
                     16:
1.1.1.2 ! maekawa    17: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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: void
                     26: #if __STDC__
                     27: mpz_set_d (mpz_ptr r, double d)
                     28: #else
                     29: mpz_set_d (r, d)
                     30:      mpz_ptr r;
                     31:      double d;
                     32: #endif
                     33: {
                     34:   int negative;
                     35:   mp_limb_t tp[3];
                     36:   mp_ptr rp;
1.1.1.2 ! maekawa    37:   mp_size_t rn;
1.1       maekawa    38:
                     39:   negative = d < 0;
                     40:   d = ABS (d);
                     41:
                     42:   /* Handle small arguments quickly.  */
                     43:   if (d < MP_BASE_AS_DOUBLE)
                     44:     {
                     45:       mp_limb_t tmp;
                     46:       tmp = d;
                     47:       PTR(r)[0] = tmp;
                     48:       SIZ(r) = negative ? -(tmp != 0) : (tmp != 0);
                     49:       return;
                     50:     }
                     51:
1.1.1.2 ! maekawa    52:   rn = __gmp_extract_double (tp, d);
1.1       maekawa    53:
1.1.1.2 ! maekawa    54:   if (ALLOC(r) < rn)
        !            55:     _mpz_realloc (r, rn);
1.1       maekawa    56:
                     57:   rp = PTR (r);
                     58:
                     59: #if BITS_PER_MP_LIMB == 32
1.1.1.2 ! maekawa    60:   switch (rn)
1.1       maekawa    61:     {
                     62:     default:
1.1.1.2 ! maekawa    63:       MPN_ZERO (rp, rn - 3);
        !            64:       rp += rn - 3;
        !            65:       /* fall through */
1.1       maekawa    66:     case 3:
                     67:       rp[2] = tp[2];
                     68:       rp[1] = tp[1];
                     69:       rp[0] = tp[0];
                     70:       break;
                     71:     case 2:
                     72:       rp[1] = tp[2];
                     73:       rp[0] = tp[1];
                     74:       break;
                     75:     case 1:
1.1.1.2 ! maekawa    76:       /* handled in "small aguments" case above */
1.1       maekawa    77:       abort ();
                     78:     }
                     79: #else
1.1.1.2 ! maekawa    80:   switch (rn)
1.1       maekawa    81:     {
                     82:     default:
1.1.1.2 ! maekawa    83:       MPN_ZERO (rp, rn - 2);
        !            84:       rp += rn - 2;
        !            85:       /* fall through */
1.1       maekawa    86:     case 2:
1.1.1.2 ! maekawa    87:       rp[1] = tp[1], rp[0] = tp[0];
1.1       maekawa    88:       break;
                     89:     case 1:
1.1.1.2 ! maekawa    90:       /* handled in "small aguments" case above */
1.1       maekawa    91:       abort ();
                     92:     }
                     93: #endif
                     94:
1.1.1.2 ! maekawa    95:   SIZ(r) = negative ? -rn : rn;
1.1       maekawa    96: }