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: }
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