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49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* mpn_bdiv_dbm1c -- divide an mpn number by a divisor of B-1, where B is the
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limb base. The dbm1c moniker means "Divisor of B Minus 1 with Carry".
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THE FUNCTION IN THIS FILE IS INTERNAL WITH A MUTABLE INTERFACE. IT IS ONLY
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SAFE TO REACH IT THROUGH DOCUMENTED INTERFACES. IN FACT, IT IS ALMOST
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GUARANTEED THAT IT'LL CHANGE OR DISAPPEAR IN A FUTURE GNU MP RELEASE.
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Copyright 2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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mp_limb_t
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mpn_bdiv_dbm1c (mp_ptr qp, mp_srcptr ap, mp_size_t n, mp_limb_t bd, mp_limb_t h)
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{
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mp_limb_t a, p0, p1, cy;
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mp_size_t i;
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for (i = 0; i < n; i++)
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{
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a = ap[i];
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umul_ppmm (p1, p0, a, bd << GMP_NAIL_BITS);
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p0 >>= GMP_NAIL_BITS;
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cy = h < p0;
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h = (h - p0) & GMP_NUMB_MASK;
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qp[i] = h;
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h = h - p1 - cy;
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}
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return h;
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}
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