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

1.1       maekawa     1: /* mpz_tdiv_qr(quot,rem,dividend,divisor) -- Set QUOT to DIVIDEND/DIVISOR,
                      2:    and REM to DIVIDEND mod DIVISOR.
                      3:
1.1.1.3 ! ohara       4: Copyright 1991, 1993, 1994, 2000, 2001 Free Software Foundation, Inc.
1.1       maekawa     5:
                      6: This file is part of the GNU MP Library.
                      7:
                      8: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2   maekawa     9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    11: option) any later version.
                     12:
                     13: The GNU MP Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2   maekawa    15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: License for more details.
                     17:
1.1.1.2   maekawa    18: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include "gmp.h"
                     24: #include "gmp-impl.h"
                     25: #include "longlong.h"
1.1.1.2   maekawa    26: #ifdef BERKELEY_MP
                     27: #include "mp.h"
                     28: #endif
                     29:
1.1       maekawa    30: void
1.1.1.3 ! ohara      31: #ifndef BERKELEY_MP
1.1       maekawa    32: mpz_tdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr num, mpz_srcptr den)
1.1.1.2   maekawa    33: #else /* BERKELEY_MP */
                     34: mdiv (mpz_srcptr num, mpz_srcptr den, mpz_ptr quot, mpz_ptr rem)
                     35: #endif /* BERKELEY_MP */
                     36: {
                     37:   mp_size_t ql;
                     38:   mp_size_t ns, ds, nl, dl;
                     39:   mp_ptr np, dp, qp, rp;
                     40:   TMP_DECL (marker);
                     41:
                     42:   ns = SIZ (num);
                     43:   ds = SIZ (den);
                     44:   nl = ABS (ns);
                     45:   dl = ABS (ds);
                     46:   ql = nl - dl + 1;
                     47:
                     48:   if (dl == 0)
                     49:     DIVIDE_BY_ZERO;
                     50:
                     51:   MPZ_REALLOC (rem, dl);
                     52:
                     53:   if (ql <= 0)
                     54:     {
                     55:       if (num != rem)
                     56:        {
                     57:          mp_ptr np, rp;
                     58:          np = PTR (num);
                     59:          rp = PTR (rem);
                     60:          MPN_COPY (rp, np, nl);
                     61:          SIZ (rem) = SIZ (num);
                     62:        }
                     63:       /* This needs to follow the assignment to rem, in case the
                     64:         numerator and quotient are the same.  */
                     65:       SIZ (quot) = 0;
                     66:       return;
                     67:     }
                     68:
                     69:   MPZ_REALLOC (quot, ql);
                     70:
                     71:   TMP_MARK (marker);
                     72:   qp = PTR (quot);
                     73:   rp = PTR (rem);
                     74:   np = PTR (num);
                     75:   dp = PTR (den);
                     76:
                     77:   /* FIXME: We should think about how to handle the temporary allocation.
                     78:      Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
                     79:      allocate temp space.  */
                     80:
                     81:   /* Copy denominator to temporary space if it overlaps with the quotient
                     82:      or remainder.  */
                     83:   if (dp == rp || dp == qp)
                     84:     {
                     85:       mp_ptr tp;
                     86:       tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
                     87:       MPN_COPY (tp, dp, dl);
                     88:       dp = tp;
                     89:     }
                     90:   /* Copy numerator to temporary space if it overlaps with the quotient or
                     91:      remainder.  */
                     92:   if (np == rp || np == qp)
                     93:     {
                     94:       mp_ptr tp;
                     95:       tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
                     96:       MPN_COPY (tp, np, nl);
                     97:       np = tp;
                     98:     }
                     99:
                    100:   mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
                    101:
                    102:   ql -=  qp[ql - 1] == 0;
                    103:   MPN_NORMALIZE (rp, dl);
                    104:
                    105:   SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
                    106:   SIZ (rem) = ns >= 0 ? dl : -dl;
                    107:   TMP_FREE (marker);
                    108: }