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Annotation of OpenXM_contrib/gmp/mpfr/ui_div.c, Revision 1.1

1.1     ! ohara       1: /* mpfr_ui_div -- divide a machine integer by a floating-point number
        !             2:
        !             3: Copyright 2000, 2001 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the MPFR Library.
        !             6:
        !             7: The MPFR Library is free software; you can redistribute it and/or modify
        !             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
        !            10: option) any later version.
        !            11:
        !            12: The MPFR 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 Lesser General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Lesser General Public License
        !            18: along with the MPFR 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 <stdio.h>
        !            23: #include "gmp.h"
        !            24: #include "gmp-impl.h"
        !            25: #include "longlong.h"
        !            26: #include "mpfr.h"
        !            27: #include "mpfr-impl.h"
        !            28:
        !            29: int
        !            30: mpfr_ui_div (mpfr_ptr y, unsigned long int u, mpfr_srcptr x, mp_rnd_t rnd_mode)
        !            31: {
        !            32:   mpfr_t uu;
        !            33:   mp_limb_t up[1];
        !            34:   unsigned long cnt;
        !            35:
        !            36:   if (MPFR_IS_NAN(x))
        !            37:     {
        !            38:       MPFR_SET_NAN(y);
        !            39:       MPFR_RET_NAN;
        !            40:     }
        !            41:
        !            42:   MPFR_CLEAR_NAN(y);
        !            43:
        !            44:   if (MPFR_IS_INF(x)) /* u/Inf = 0 */
        !            45:     {
        !            46:       MPFR_CLEAR_INF(y);
        !            47:       MPFR_SET_ZERO(y);
        !            48:       if (MPFR_SIGN(x) != MPFR_SIGN(y))
        !            49:        MPFR_CHANGE_SIGN(y);
        !            50:       MPFR_RET(0);
        !            51:     }
        !            52:
        !            53:   MPFR_CLEAR_INF(y);
        !            54:
        !            55:   if (u)
        !            56:     {
        !            57:       MPFR_INIT1(up, uu, BITS_PER_MP_LIMB, 1);
        !            58:       count_leading_zeros(cnt, (mp_limb_t) u);
        !            59:       *up = (mp_limb_t) u << cnt;
        !            60:       MPFR_EXP(uu) = BITS_PER_MP_LIMB-cnt;
        !            61:
        !            62:       return mpfr_div (y, uu, x, rnd_mode);
        !            63:     }
        !            64:   else /* u = 0 */
        !            65:     {
        !            66:       if (MPFR_IS_ZERO(x)) /* 0/0 */
        !            67:        {
        !            68:          MPFR_SET_NAN(y);
        !            69:          MPFR_RET_NAN;
        !            70:        }
        !            71:       else
        !            72:        {
        !            73:          MPFR_SET_ZERO(y); /* if u=0, then set y to 0 */
        !            74:          MPFR_RET(0);
        !            75:        }
        !            76:     }
        !            77: }