/* mpn_bdiv_dbm1c -- divide an mpn number by a divisor of B-1, where B is the

   limb base.  The dbm1c moniker means "Divisor of B Minus 1 with Carry".

   THE FUNCTION IN THIS FILE IS INTERNAL WITH A MUTABLE INTERFACE.  IT IS ONLY

   SAFE TO REACH IT THROUGH DOCUMENTED INTERFACES.  IN FACT, IT IS ALMOST

   GUARANTEED THAT IT'LL CHANGE OR DISAPPEAR IN A FUTURE GNU MP RELEASE.

Copyright 2008, 2009 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 either:

  * the GNU Lesser General Public License as published by the Free

    Software Foundation; either version 3 of the License, or (at your

    option) any later version.

or

  * the GNU General Public License as published by the Free Software

    Foundation; either version 2 of the License, or (at your option) any

    later version.

or both in parallel, as here.

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 General Public License

for more details.

You should have received copies of the GNU General Public License and the

GNU Lesser General Public License along with the GNU MP Library.  If not,

see https://www.gnu.org/licenses/.  */

#include "gmp.h"

#include "gmp-impl.h"

#include "longlong.h"

mp_limb_t

mpn_bdiv_dbm1c (mp_ptr qp, mp_srcptr ap, mp_size_t n, mp_limb_t bd, mp_limb_t h)

{

  mp_limb_t a, p0, p1, cy;

  mp_size_t i;

  for (i = 0; i < n; i++)

    {

      a = ap[i];

      umul_ppmm (p1, p0, a, bd << GMP_NAIL_BITS);

      p0 >>= GMP_NAIL_BITS;

      cy = h < p0;

      h = (h - p0) & GMP_NUMB_MASK;

      qp[i] = h;

      h = h - p1 - cy;

    }

  return h;

}