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Annotation of OpenXM_contrib/gmp/mpz/set_d.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_set_d(integer, val) -- Assign INTEGER with a double value VAL.
        !             2:
        !             3: Copyright (C) 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: 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_size_t size;
        !            36:   mp_limb_t tp[3];
        !            37:   mp_ptr rp;
        !            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:
        !            52:   size = __gmp_extract_double (tp, d);
        !            53:
        !            54:   if (ALLOC(r) < size)
        !            55:     _mpz_realloc (r, size);
        !            56:
        !            57:   rp = PTR (r);
        !            58:
        !            59: #if BITS_PER_MP_LIMB == 32
        !            60:   switch (size)
        !            61:     {
        !            62:     default:
        !            63:       MPN_ZERO (rp, size - 3);
        !            64:       rp += size - 3;
        !            65:     case 3:
        !            66:       rp[2] = tp[2];
        !            67:       rp[1] = tp[1];
        !            68:       rp[0] = tp[0];
        !            69:       break;
        !            70:     case 2:
        !            71:       rp[1] = tp[2];
        !            72:       rp[0] = tp[1];
        !            73:       break;
        !            74:     case 1:
        !            75:       abort ();
        !            76:     }
        !            77: #else
        !            78:   switch (size)
        !            79:     {
        !            80:     default:
        !            81:       MPN_ZERO (rp, size - 2);
        !            82:       rp += size - 2;
        !            83:     case 2:
        !            84:       rp[1] = tp[1];
        !            85:       rp[0] = tp[0];
        !            86:       break;
        !            87:     case 1:
        !            88:       abort ();
        !            89:     }
        !            90: #endif
        !            91:
        !            92:   SIZ(r) = negative ? -size : size;
        !            93: }