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: }
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