From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001 From: Duncan Wilkie Date: Sat, 18 Nov 2023 06:11:09 -0600 Subject: Initial commit. --- gmp-6.3.0/mpn/generic/bdiv_dbm1c.c | 58 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 gmp-6.3.0/mpn/generic/bdiv_dbm1c.c (limited to 'gmp-6.3.0/mpn/generic/bdiv_dbm1c.c') diff --git a/gmp-6.3.0/mpn/generic/bdiv_dbm1c.c b/gmp-6.3.0/mpn/generic/bdiv_dbm1c.c new file mode 100644 index 0000000..543bb6e --- /dev/null +++ b/gmp-6.3.0/mpn/generic/bdiv_dbm1c.c @@ -0,0 +1,58 @@ +/* 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-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; +} -- cgit v1.2.3