| /* mpz_tdiv_q -- divide two integers and produce a quotient. |
| |
| Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2005, 2010, 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" |
| #include "longlong.h" |
| |
| void |
| mpz_tdiv_q (mpz_ptr quot, mpz_srcptr num, mpz_srcptr den) |
| { |
| mp_size_t ql; |
| mp_size_t ns, ds, nl, dl; |
| mp_ptr np, dp, qp, tp; |
| TMP_DECL; |
| |
| ns = SIZ (num); |
| ds = SIZ (den); |
| nl = ABS (ns); |
| dl = ABS (ds); |
| ql = nl - dl + 1; |
| |
| if (UNLIKELY (dl == 0)) |
| DIVIDE_BY_ZERO; |
| |
| if (ql <= 0) |
| { |
| SIZ (quot) = 0; |
| return; |
| } |
| |
| qp = MPZ_REALLOC (quot, ql); |
| |
| TMP_MARK; |
| dp = PTR (den); |
| |
| /* Copy denominator to temporary space if it overlaps with the quotient. */ |
| if (dp == qp) |
| { |
| mp_ptr tp; |
| tp = TMP_ALLOC_LIMBS (dl); |
| MPN_COPY (tp, dp, dl); |
| dp = tp; |
| } |
| |
| tp = TMP_ALLOC_LIMBS (nl + 1); |
| np = PTR (num); |
| /* Copy numerator to temporary space if it overlaps with the quotient. */ |
| if (np == qp) |
| { |
| MPN_COPY (tp, np, nl); |
| /* Overlap dividend and scratch. */ |
| np = tp; |
| } |
| mpn_div_q (qp, np, nl, dp, dl, tp); |
| |
| ql -= qp[ql - 1] == 0; |
| |
| SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql; |
| TMP_FREE; |
| } |