Return to pre_mod_1.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpn / generic

Annotation of OpenXM_contrib/gmp/mpn/generic/pre_mod_1.c, Revision 1.1

1.1     ! maekawa     1: /* mpn_preinv_mod_1 (dividend_ptr, dividend_size, divisor_limb,
        !             2:                       divisor_limb_inverted) --
        !             3:    Divide (DIVIDEND_PTR,,DIVIDEND_SIZE) by the normalized DIVISOR_LIMB.
        !             4:    DIVISOR_LIMB_INVERTED should be 2^(2*BITS_PER_MP_LIMB) / DIVISOR_LIMB +
        !             5:    - 2^BITS_PER_MP_LIMB.
        !             6:    Return the single-limb remainder.
        !             7:
        !             8: Copyright (C) 1991, 1993, 1994, Free Software Foundation, Inc.
        !             9:
        !            10: This file is part of the GNU MP Library.
        !            11:
        !            12: The GNU MP Library is free software; you can redistribute it and/or modify
        !            13: it under the terms of the GNU Library General Public License as published by
        !            14: the Free Software Foundation; either version 2 of the License, or (at your
        !            15: option) any later version.
        !            16:
        !            17: The GNU MP Library is distributed in the hope that it will be useful, but
        !            18: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            19: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            20: License for more details.
        !            21:
        !            22: You should have received a copy of the GNU Library General Public License
        !            23: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            24: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            25: MA 02111-1307, USA. */
        !            26:
        !            27: #include "gmp.h"
        !            28: #include "gmp-impl.h"
        !            29: #include "longlong.h"
        !            30:
        !            31: #ifndef UMUL_TIME
        !            32: #define UMUL_TIME 1
        !            33: #endif
        !            34:
        !            35: #ifndef UDIV_TIME
        !            36: #define UDIV_TIME UMUL_TIME
        !            37: #endif
        !            38:
        !            39: mp_limb_t
        !            40: #if __STDC__
        !            41: mpn_preinv_mod_1 (mp_srcptr dividend_ptr, mp_size_t dividend_size,
        !            42:                  mp_limb_t divisor_limb, mp_limb_t divisor_limb_inverted)
        !            43: #else
        !            44: mpn_preinv_mod_1 (dividend_ptr, dividend_size, divisor_limb, divisor_limb_inverted)
        !            45:      mp_srcptr dividend_ptr;
        !            46:      mp_size_t dividend_size;
        !            47:      mp_limb_t divisor_limb;
        !            48:      mp_limb_t divisor_limb_inverted;
        !            49: #endif
        !            50: {
        !            51:   mp_size_t i;
        !            52:   mp_limb_t n0, r;
        !            53:   int dummy;
        !            54:
        !            55:   i = dividend_size - 1;
        !            56:   r = dividend_ptr[i];
        !            57:
        !            58:   if (r >= divisor_limb)
        !            59:     r = 0;
        !            60:   else
        !            61:     i--;
        !            62:
        !            63:   for (; i >= 0; i--)
        !            64:     {
        !            65:       n0 = dividend_ptr[i];
        !            66:       udiv_qrnnd_preinv (dummy, r, r, n0, divisor_limb, divisor_limb_inverted);
        !            67:     }
        !            68:   return r;
        !            69: }