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/* 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 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.
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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://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;
}
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