| /* mpn_preinv_mod_1 (up, un, d, dinv) -- Divide (UP,,UN) by the normalized D. |
| DINV should be 2^(2*GMP_LIMB_BITS) / D - 2^GMP_LIMB_BITS. |
| Return the single-limb remainder. |
| |
| Copyright 1991, 1993, 1994, 2000, 2001, 2002, 2004, 2005 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" |
| |
| |
| /* This function used to be documented, but is now considered obsolete. It |
| continues to exist for binary compatibility, even when not required |
| internally. */ |
| |
| mp_limb_t |
| mpn_preinv_mod_1 (mp_srcptr up, mp_size_t un, mp_limb_t d, mp_limb_t dinv) |
| { |
| mp_size_t i; |
| mp_limb_t n0, r; |
| mp_limb_t dummy; |
| |
| ASSERT (un >= 1); |
| ASSERT (d & GMP_LIMB_HIGHBIT); |
| |
| r = up[un - 1]; |
| if (r >= d) |
| r -= d; |
| |
| for (i = un - 2; i >= 0; i--) |
| { |
| n0 = up[i]; |
| udiv_qrnnd_preinv (dummy, r, r, n0, d, dinv); |
| } |
| return r; |
| } |