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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* mpn_bdiv_q -- Hensel division with precomputed inverse, returning quotient.
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Contributed to the GNU project by Torbjorn Granlund.
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THE FUNCTIONS IN THIS FILE ARE INTERNAL WITH MUTABLE INTERFACES. IT IS ONLY
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SAFE TO REACH THEM THROUGH DOCUMENTED INTERFACES. IN FACT, IT IS ALMOST
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GUARANTEED THAT THEY WILL CHANGE OR DISAPPEAR IN A FUTURE GMP RELEASE.
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Copyright 2006, 2007, 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 either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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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 General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp-impl.h"
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/* Computes Q = N / D mod B^n. */
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void
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mpn_bdiv_q (mp_ptr qp,
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mp_srcptr np, mp_size_t nn,
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mp_srcptr dp, mp_size_t dn,
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mp_ptr tp)
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{
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mp_limb_t di;
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if (BELOW_THRESHOLD (dn, DC_BDIV_Q_THRESHOLD))
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{
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MPN_COPY (tp, np, nn);
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binvert_limb (di, dp[0]); di = -di;
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mpn_sbpi1_bdiv_q (qp, tp, nn, dp, dn, di);
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}
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else if (BELOW_THRESHOLD (dn, MU_BDIV_Q_THRESHOLD))
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{
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MPN_COPY (tp, np, nn);
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binvert_limb (di, dp[0]); di = -di;
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mpn_dcpi1_bdiv_q (qp, tp, nn, dp, dn, di);
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}
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else
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{
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mpn_mu_bdiv_q (qp, np, nn, dp, dn, tp);
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}
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return;
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}
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mp_size_t
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mpn_bdiv_q_itch (mp_size_t nn, mp_size_t dn)
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{
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if (BELOW_THRESHOLD (dn, MU_BDIV_Q_THRESHOLD))
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return nn;
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else
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return mpn_mu_bdiv_q_itch (nn, dn);
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}
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