Return to tdiv_qr.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpz

Annotation of OpenXM_contrib/gmp/mpz/tdiv_qr.c, Revision 1.1.1.2

1.1       maekawa     1: /* mpz_tdiv_qr(quot,rem,dividend,divisor) -- Set QUOT to DIVIDEND/DIVISOR,
                      2:    and REM to DIVIDEND mod DIVISOR.
                      3:
1.1.1.2 ! maekawa     4: Copyright (C) 1991, 1993, 1994, 2000 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:
        !            30:
        !            31: #ifndef BERKELEY_MP
1.1       maekawa    32:
                     33: void
                     34: #if __STDC__
                     35: mpz_tdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr num, mpz_srcptr den)
                     36: #else
                     37: mpz_tdiv_qr (quot, rem, num, den)
                     38:      mpz_ptr quot;
                     39:      mpz_ptr rem;
                     40:      mpz_srcptr num;
                     41:      mpz_srcptr den;
                     42: #endif
                     43:
1.1.1.2 ! maekawa    44: #else /* BERKELEY_MP */
        !            45:
        !            46: void
        !            47: #if __STDC__
        !            48: mdiv (mpz_srcptr num, mpz_srcptr den, mpz_ptr quot, mpz_ptr rem)
        !            49: #else
        !            50: mdiv (num, den, quot, rem)
        !            51:      mpz_srcptr num;
        !            52:      mpz_srcptr den;
        !            53:      mpz_ptr    quot;
        !            54:      mpz_ptr    rem;
        !            55: #endif
        !            56:
        !            57: #endif /* BERKELEY_MP */
        !            58: {
        !            59:   mp_size_t ql;
        !            60:   mp_size_t ns, ds, nl, dl;
        !            61:   mp_ptr np, dp, qp, rp;
        !            62:   TMP_DECL (marker);
        !            63:
        !            64:   ns = SIZ (num);
        !            65:   ds = SIZ (den);
        !            66:   nl = ABS (ns);
        !            67:   dl = ABS (ds);
        !            68:   ql = nl - dl + 1;
        !            69:
        !            70:   if (dl == 0)
        !            71:     DIVIDE_BY_ZERO;
        !            72:
        !            73:   MPZ_REALLOC (rem, dl);
        !            74:
        !            75:   if (ql <= 0)
        !            76:     {
        !            77:       if (num != rem)
        !            78:        {
        !            79:          mp_ptr np, rp;
        !            80:          np = PTR (num);
        !            81:          rp = PTR (rem);
        !            82:          MPN_COPY (rp, np, nl);
        !            83:          SIZ (rem) = SIZ (num);
        !            84:        }
        !            85:       /* This needs to follow the assignment to rem, in case the
        !            86:         numerator and quotient are the same.  */
        !            87:       SIZ (quot) = 0;
        !            88:       return;
        !            89:     }
        !            90:
        !            91:   MPZ_REALLOC (quot, ql);
        !            92:
        !            93:   TMP_MARK (marker);
        !            94:   qp = PTR (quot);
        !            95:   rp = PTR (rem);
        !            96:   np = PTR (num);
        !            97:   dp = PTR (den);
        !            98:
        !            99:   /* FIXME: We should think about how to handle the temporary allocation.
        !           100:      Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
        !           101:      allocate temp space.  */
        !           102:
        !           103:   /* Copy denominator to temporary space if it overlaps with the quotient
        !           104:      or remainder.  */
        !           105:   if (dp == rp || dp == qp)
        !           106:     {
        !           107:       mp_ptr tp;
        !           108:       tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
        !           109:       MPN_COPY (tp, dp, dl);
        !           110:       dp = tp;
        !           111:     }
        !           112:   /* Copy numerator to temporary space if it overlaps with the quotient or
        !           113:      remainder.  */
        !           114:   if (np == rp || np == qp)
        !           115:     {
        !           116:       mp_ptr tp;
        !           117:       tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
        !           118:       MPN_COPY (tp, np, nl);
        !           119:       np = tp;
        !           120:     }
        !           121:
        !           122:   mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
        !           123:
        !           124:   ql -=  qp[ql - 1] == 0;
        !           125:   MPN_NORMALIZE (rp, dl);
        !           126:
        !           127:   SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
        !           128:   SIZ (rem) = ns >= 0 ? dl : -dl;
        !           129:   TMP_FREE (marker);
        !           130: }