tdiv_q.c
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上传日期:2022-08-06
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- /* mpz_tdiv_q -- divide two integers and produce a quotient.
- Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2005, 2010 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_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;
- TMP_DECL;
- ns = SIZ (num);
- ds = SIZ (den);
- nl = ABS (ns);
- dl = ABS (ds);
- ql = nl - dl + 1;
- if (dl == 0)
- DIVIDE_BY_ZERO;
- if (ql <= 0)
- {
- SIZ (quot) = 0;
- return;
- }
- MPZ_REALLOC (quot, ql);
- TMP_MARK;
- qp = PTR (quot);
- np = PTR (num);
- 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;
- }
- /* Copy numerator to temporary space if it overlaps with the quotient. */
- if (np == qp)
- {
- mp_ptr tp;
- tp = TMP_ALLOC_LIMBS (nl + 1);
- MPN_COPY (tp, np, nl);
- /* Overlap dividend and scratch. */
- mpn_div_q (qp, tp, nl, dp, dl, tp);
- }
- else
- {
- mp_ptr tp;
- tp = TMP_ALLOC_LIMBS (nl + 1);
- mpn_div_q (qp, np, nl, dp, dl, tp);
- }
- ql -= qp[ql - 1] == 0;
- SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
- TMP_FREE;
- }