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

1.1       maekawa     1: /* mpz_tdiv_r(rem, dividend, divisor) -- Set REM to DIVIDEND mod DIVISOR.
                      2:
1.1.1.2 ! maekawa     3: Copyright (C) 1991, 1993, 1994, 2000 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: #if __STDC__
                     28: mpz_tdiv_r (mpz_ptr rem, mpz_srcptr num, mpz_srcptr den)
                     29: #else
                     30: mpz_tdiv_r (rem, num, den)
                     31:      mpz_ptr rem;
                     32:      mpz_srcptr num;
                     33:      mpz_srcptr den;
                     34: #endif
1.1.1.2 ! maekawa    35: {
        !            36:   mp_size_t ql;
        !            37:   mp_size_t ns, ds, nl, dl;
        !            38:   mp_ptr np, dp, qp, rp;
        !            39:   TMP_DECL (marker);
        !            40:
        !            41:   ns = SIZ (num);
        !            42:   ds = SIZ (den);
        !            43:   nl = ABS (ns);
        !            44:   dl = ABS (ds);
        !            45:   ql = nl - dl + 1;
        !            46:
        !            47:   if (dl == 0)
        !            48:     DIVIDE_BY_ZERO;
        !            49:
        !            50:   MPZ_REALLOC (rem, dl);
        !            51:
        !            52:   if (ql <= 0)
        !            53:     {
        !            54:       if (num != rem)
        !            55:        {
        !            56:          mp_ptr np, rp;
        !            57:          np = PTR (num);
        !            58:          rp = PTR (rem);
        !            59:          MPN_COPY (rp, np, nl);
        !            60:          SIZ (rem) = SIZ (num);
        !            61:        }
        !            62:       return;
        !            63:     }
        !            64:
        !            65:   TMP_MARK (marker);
        !            66:   qp = (mp_ptr) TMP_ALLOC (ql * BYTES_PER_MP_LIMB);
        !            67:   rp = PTR (rem);
        !            68:   np = PTR (num);
        !            69:   dp = PTR (den);
        !            70:
        !            71:   /* FIXME: We should think about how to handle the temporary allocation.
        !            72:      Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
        !            73:      allocate temp space.  */
        !            74:
        !            75:   /* Copy denominator to temporary space if it overlaps with the remainder.  */
        !            76:   if (dp == rp)
        !            77:     {
        !            78:       mp_ptr tp;
        !            79:       tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
        !            80:       MPN_COPY (tp, dp, dl);
        !            81:       dp = tp;
        !            82:     }
        !            83:   /* Copy numerator to temporary space if it overlaps with the remainder.  */
        !            84:   if (np == rp)
        !            85:     {
        !            86:       mp_ptr tp;
        !            87:       tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
        !            88:       MPN_COPY (tp, np, nl);
        !            89:       np = tp;
        !            90:     }
        !            91:
        !            92:   mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
        !            93:
        !            94:   MPN_NORMALIZE (rp, dl);
        !            95:
        !            96:   SIZ (rem) = ns >= 0 ? dl : -dl;
        !            97:   TMP_FREE (marker);
        !            98: }