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Annotation of OpenXM_contrib/gmp/mpz/tdiv_r.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpz_tdiv_r(rem, dividend, divisor) -- Set REM to DIVIDEND mod DIVISOR.
                      2:
1.1.1.3 ! ohara       3: Copyright 1991, 1993, 1994, 2000, 2001 Free Software Foundation, Inc.
1.1       maekawa     4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2   maekawa     8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2   maekawa    14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    15: License for more details.
                     16:
1.1.1.2   maekawa    17: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24: #include "longlong.h"
                     25:
                     26: void
                     27: mpz_tdiv_r (mpz_ptr rem, mpz_srcptr num, mpz_srcptr den)
1.1.1.2   maekawa    28: {
                     29:   mp_size_t ql;
                     30:   mp_size_t ns, ds, nl, dl;
                     31:   mp_ptr np, dp, qp, rp;
                     32:   TMP_DECL (marker);
                     33:
                     34:   ns = SIZ (num);
                     35:   ds = SIZ (den);
                     36:   nl = ABS (ns);
                     37:   dl = ABS (ds);
                     38:   ql = nl - dl + 1;
                     39:
                     40:   if (dl == 0)
                     41:     DIVIDE_BY_ZERO;
                     42:
                     43:   MPZ_REALLOC (rem, dl);
                     44:
                     45:   if (ql <= 0)
                     46:     {
                     47:       if (num != rem)
                     48:        {
                     49:          mp_ptr np, rp;
                     50:          np = PTR (num);
                     51:          rp = PTR (rem);
                     52:          MPN_COPY (rp, np, nl);
                     53:          SIZ (rem) = SIZ (num);
                     54:        }
                     55:       return;
                     56:     }
                     57:
                     58:   TMP_MARK (marker);
                     59:   qp = (mp_ptr) TMP_ALLOC (ql * BYTES_PER_MP_LIMB);
                     60:   rp = PTR (rem);
                     61:   np = PTR (num);
                     62:   dp = PTR (den);
                     63:
                     64:   /* FIXME: We should think about how to handle the temporary allocation.
                     65:      Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
                     66:      allocate temp space.  */
                     67:
                     68:   /* Copy denominator to temporary space if it overlaps with the remainder.  */
                     69:   if (dp == rp)
                     70:     {
                     71:       mp_ptr tp;
                     72:       tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
                     73:       MPN_COPY (tp, dp, dl);
                     74:       dp = tp;
                     75:     }
                     76:   /* Copy numerator to temporary space if it overlaps with the remainder.  */
                     77:   if (np == rp)
                     78:     {
                     79:       mp_ptr tp;
                     80:       tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
                     81:       MPN_COPY (tp, np, nl);
                     82:       np = tp;
                     83:     }
                     84:
                     85:   mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
                     86:
                     87:   MPN_NORMALIZE (rp, dl);
                     88:
                     89:   SIZ (rem) = ns >= 0 ? dl : -dl;
                     90:   TMP_FREE (marker);
                     91: }