70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* mpn_preinv_mod_1 (dividend_ptr, dividend_size, divisor_limb,
|
|
divisor_limb_inverted) --
|
|
Divide (DIVIDEND_PTR,,DIVIDEND_SIZE) by the normalized DIVISOR_LIMB.
|
|
DIVISOR_LIMB_INVERTED should be 2^(2*BITS_PER_MP_LIMB) / DIVISOR_LIMB +
|
|
- 2^BITS_PER_MP_LIMB.
|
|
Return the single-limb remainder.
|
|
|
|
Copyright (C) 1991, 1993, 1994, Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Library General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MP Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
|
|
MA 02111-1307, USA. */
|
|
|
|
#include "gmp.h"
|
|
#include "gmp-impl.h"
|
|
#include "longlong.h"
|
|
|
|
#ifndef UMUL_TIME
|
|
#define UMUL_TIME 1
|
|
#endif
|
|
|
|
#ifndef UDIV_TIME
|
|
#define UDIV_TIME UMUL_TIME
|
|
#endif
|
|
|
|
mp_limb_t
|
|
#if __STDC__
|
|
mpn_preinv_mod_1 (mp_srcptr dividend_ptr, mp_size_t dividend_size,
|
|
mp_limb_t divisor_limb, mp_limb_t divisor_limb_inverted)
|
|
#else
|
|
mpn_preinv_mod_1 (dividend_ptr, dividend_size, divisor_limb, divisor_limb_inverted)
|
|
mp_srcptr dividend_ptr;
|
|
mp_size_t dividend_size;
|
|
mp_limb_t divisor_limb;
|
|
mp_limb_t divisor_limb_inverted;
|
|
#endif
|
|
{
|
|
mp_size_t i;
|
|
mp_limb_t n0, r;
|
|
int dummy;
|
|
|
|
i = dividend_size - 1;
|
|
r = dividend_ptr[i];
|
|
|
|
if (r >= divisor_limb)
|
|
r = 0;
|
|
else
|
|
i--;
|
|
|
|
for (; i >= 0; i--)
|
|
{
|
|
n0 = dividend_ptr[i];
|
|
udiv_qrnnd_preinv (dummy, r, r, n0, divisor_limb, divisor_limb_inverted);
|
|
}
|
|
return r;
|
|
}
|