| /* mpz_tdiv_r(rem, dividend, divisor) -- Set REM to DIVIDEND mod DIVISOR. |
| |
| Copyright 1991, 1993, 1994, 2000, 2001, 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" |
| |
| void |
| mpz_tdiv_r (mpz_ptr rem, mpz_srcptr num, mpz_srcptr den) |
| { |
| mp_size_t ql; |
| mp_size_t ns, ds, nl, dl; |
| mp_ptr np, dp, qp, rp; |
| TMP_DECL; |
| |
| ns = SIZ (num); |
| ds = SIZ (den); |
| nl = ABS (ns); |
| dl = ABS (ds); |
| ql = nl - dl + 1; |
| |
| if (dl == 0) |
| DIVIDE_BY_ZERO; |
| |
| MPZ_REALLOC (rem, dl); |
| |
| if (ql <= 0) |
| { |
| if (num != rem) |
| { |
| mp_ptr np, rp; |
| np = PTR (num); |
| rp = PTR (rem); |
| MPN_COPY (rp, np, nl); |
| SIZ (rem) = SIZ (num); |
| } |
| return; |
| } |
| |
| TMP_MARK; |
| qp = (mp_ptr) TMP_ALLOC (ql * BYTES_PER_MP_LIMB); |
| rp = PTR (rem); |
| np = PTR (num); |
| dp = PTR (den); |
| |
| /* FIXME: We should think about how to handle the temporary allocation. |
| Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to |
| allocate temp space. */ |
| |
| /* Copy denominator to temporary space if it overlaps with the remainder. */ |
| if (dp == rp) |
| { |
| mp_ptr tp; |
| tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB); |
| MPN_COPY (tp, dp, dl); |
| dp = tp; |
| } |
| /* Copy numerator to temporary space if it overlaps with the remainder. */ |
| if (np == rp) |
| { |
| mp_ptr tp; |
| tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB); |
| MPN_COPY (tp, np, nl); |
| np = tp; |
| } |
| |
| mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl); |
| |
| MPN_NORMALIZE (rp, dl); |
| |
| SIZ (rem) = ns >= 0 ? dl : -dl; |
| TMP_FREE; |
| } |