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_qr.c | 84 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 gmp-6.3.0/mpn/generic/bdiv_qr.c (limited to 'gmp-6.3.0/mpn/generic/bdiv_qr.c') diff --git a/gmp-6.3.0/mpn/generic/bdiv_qr.c b/gmp-6.3.0/mpn/generic/bdiv_qr.c new file mode 100644 index 0000000..a4f0f39 --- /dev/null +++ b/gmp-6.3.0/mpn/generic/bdiv_qr.c @@ -0,0 +1,84 @@ +/* mpn_bdiv_qr -- Hensel division with precomputed inverse, returning quotient + and remainder. + + Contributed to the GNU project by Torbjorn Granlund. + + THE FUNCTIONS IN THIS FILE ARE INTERNAL WITH MUTABLE INTERFACES. IT IS ONLY + SAFE TO REACH THEM THROUGH DOCUMENTED INTERFACES. IN FACT, IT IS ALMOST + GUARANTEED THAT THEY WILL CHANGE OR DISAPPEAR IN A FUTURE GMP RELEASE. + +Copyright 2006, 2007, 2009, 2012 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" + + +/* Computes Q = N / D mod B^n, + R = N - QD. */ + +mp_limb_t +mpn_bdiv_qr (mp_ptr qp, mp_ptr rp, + mp_srcptr np, mp_size_t nn, + mp_srcptr dp, mp_size_t dn, + mp_ptr tp) +{ + mp_limb_t di; + mp_limb_t rh; + + ASSERT (nn > dn); + if (BELOW_THRESHOLD (dn, DC_BDIV_QR_THRESHOLD) || + BELOW_THRESHOLD (nn - dn, DC_BDIV_QR_THRESHOLD)) + { + MPN_COPY (tp, np, nn); + binvert_limb (di, dp[0]); di = -di; + rh = mpn_sbpi1_bdiv_qr (qp, tp, nn, dp, dn, di); + MPN_COPY (rp, tp + nn - dn, dn); + } + else if (BELOW_THRESHOLD (dn, MU_BDIV_QR_THRESHOLD)) + { + MPN_COPY (tp, np, nn); + binvert_limb (di, dp[0]); di = -di; + rh = mpn_dcpi1_bdiv_qr (qp, tp, nn, dp, dn, di); + MPN_COPY (rp, tp + nn - dn, dn); + } + else + { + rh = mpn_mu_bdiv_qr (qp, rp, np, nn, dp, dn, tp); + } + + return rh; +} + +mp_size_t +mpn_bdiv_qr_itch (mp_size_t nn, mp_size_t dn) +{ + if (BELOW_THRESHOLD (dn, MU_BDIV_QR_THRESHOLD)) + return nn; + else + return mpn_mu_bdiv_qr_itch (nn, dn); +} -- cgit v1.2.3