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Annotation of OpenXM_contrib/gmp/mpf/div_ui.c, Revision 1.1

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