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Annotation of OpenXM_contrib/gmp/mpf/div_ui.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpf_div_ui -- Divide a float with an unsigned integer.
                      2:
1.1.1.3 ! ohara       3: Copyright 1993, 1994, 1996, 2000, 2001, 2002 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: #include "longlong.h"
                     25:
                     26: void
                     27: mpf_div_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
                     28: {
                     29:   mp_srcptr up;
                     30:   mp_ptr rp, tp, rtp;
                     31:   mp_size_t usize;
                     32:   mp_size_t rsize, tsize;
                     33:   mp_size_t sign_quotient;
                     34:   mp_size_t prec;
                     35:   mp_limb_t q_limb;
                     36:   mp_exp_t rexp;
                     37:   TMP_DECL (marker);
1.1.1.3 ! ohara      38:
        !            39: #if GMP_NAIL_BITS != 0
        !            40:   if (v > GMP_NUMB_MAX)
        !            41:     {
        !            42:       mpf_t vf;
        !            43:       mp_limb_t vl[2];
        !            44:       SIZ(vf) = 2;
        !            45:       EXP(vf) = 2;
        !            46:       PTR(vf) = vl;
        !            47:       vl[0] = v & GMP_NUMB_MASK;
        !            48:       vl[1] = v >> GMP_NUMB_BITS;
        !            49:       mpf_div (r, u, vf);
        !            50:       return;
        !            51:     }
        !            52: #endif
1.1       maekawa    53:
                     54:   usize = u->_mp_size;
                     55:   sign_quotient = usize;
                     56:   usize = ABS (usize);
                     57:   prec = r->_mp_prec;
                     58:
                     59:   if (v == 0)
1.1.1.2   maekawa    60:     DIVIDE_BY_ZERO;
                     61:
1.1       maekawa    62:   if (usize == 0)
                     63:     {
                     64:       r->_mp_size = 0;
                     65:       r->_mp_exp = 0;
                     66:       return;
                     67:     }
                     68:
                     69:   TMP_MARK (marker);
                     70:
                     71:   rp = r->_mp_d;
                     72:   up = u->_mp_d;
                     73:
                     74:   tsize = 1 + prec;
                     75:   tp = (mp_ptr) TMP_ALLOC ((tsize + 1) * BYTES_PER_MP_LIMB);
                     76:
                     77:   if (usize > tsize)
                     78:     {
                     79:       up += usize - tsize;
                     80:       usize = tsize;
                     81:       rtp = tp;
                     82:     }
                     83:   else
                     84:     {
                     85:       MPN_ZERO (tp, tsize - usize);
                     86:       rtp = tp + (tsize - usize);
                     87:     }
                     88:
                     89:   /* Move the dividend to the remainder.  */
                     90:   MPN_COPY (rtp, up, usize);
                     91:
                     92:   mpn_divmod_1 (rp, tp, tsize, (mp_limb_t) v);
                     93:   q_limb = rp[tsize - 1];
                     94:
                     95:   rsize = tsize - (q_limb == 0);
                     96:   rexp = u->_mp_exp - (q_limb == 0);
                     97:   r->_mp_size = sign_quotient >= 0 ? rsize : -rsize;
                     98:   r->_mp_exp = rexp;
                     99:   TMP_FREE (marker);
                    100: }