109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* mpz_tdiv_qr(quot,rem,dividend,divisor) -- Set QUOT to DIVIDEND/DIVISOR,
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and REM to DIVIDEND mod DIVISOR.
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Copyright 1991, 1993, 1994, 2000, 2001, 2005 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 the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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#ifdef BERKELEY_MP
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#include "mp.h"
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#endif
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void
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#ifndef BERKELEY_MP
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mpz_tdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr num, mpz_srcptr den)
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#else /* BERKELEY_MP */
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mdiv (mpz_srcptr num, mpz_srcptr den, mpz_ptr quot, mpz_ptr rem)
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#endif /* BERKELEY_MP */
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{
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mp_size_t ql;
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mp_size_t ns, ds, nl, dl;
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mp_ptr np, dp, qp, rp;
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TMP_DECL;
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ns = SIZ (num);
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ds = SIZ (den);
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nl = ABS (ns);
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dl = ABS (ds);
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ql = nl - dl + 1;
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if (dl == 0)
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DIVIDE_BY_ZERO;
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MPZ_REALLOC (rem, dl);
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if (ql <= 0)
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{
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if (num != rem)
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{
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mp_ptr np, rp;
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np = PTR (num);
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rp = PTR (rem);
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MPN_COPY (rp, np, nl);
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SIZ (rem) = SIZ (num);
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}
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/* This needs to follow the assignment to rem, in case the
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numerator and quotient are the same. */
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SIZ (quot) = 0;
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return;
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}
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MPZ_REALLOC (quot, ql);
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TMP_MARK;
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qp = PTR (quot);
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rp = PTR (rem);
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np = PTR (num);
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dp = PTR (den);
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/* FIXME: We should think about how to handle the temporary allocation.
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Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
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allocate temp space. */
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/* Copy denominator to temporary space if it overlaps with the quotient
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or remainder. */
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if (dp == rp || dp == qp)
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{
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mp_ptr tp;
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tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
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MPN_COPY (tp, dp, dl);
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dp = tp;
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}
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/* Copy numerator to temporary space if it overlaps with the quotient or
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remainder. */
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if (np == rp || np == qp)
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{
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mp_ptr tp;
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tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
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MPN_COPY (tp, np, nl);
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np = tp;
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}
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mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
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ql -= qp[ql - 1] == 0;
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MPN_NORMALIZE (rp, dl);
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SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
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SIZ (rem) = ns >= 0 ? dl : -dl;
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TMP_FREE;
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}
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