Annotation of OpenXM_contrib/gmp/mpz/tdiv_q.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpz_tdiv_q -- divide two integers and produce a quotient.
2:
1.1.1.2 ! maekawa 3: Copyright (C) 1991, 1993, 1994, 1996, 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_q (mpz_ptr quot, mpz_srcptr num, mpz_srcptr den)
29: #else
30: mpz_tdiv_q (quot, num, den)
31: mpz_ptr quot;
32: mpz_srcptr num;
33: mpz_srcptr den;
34: #endif
35: {
1.1.1.2 ! maekawa 36: mp_size_t ql;
! 37: mp_size_t ns, ds, nl, dl;
! 38: mp_ptr np, dp, qp, rp;
1.1 maekawa 39: TMP_DECL (marker);
40:
1.1.1.2 ! maekawa 41: ns = SIZ (num);
! 42: ds = SIZ (den);
! 43: nl = ABS (ns);
! 44: dl = ABS (ds);
! 45: ql = nl - dl + 1;
1.1 maekawa 46:
1.1.1.2 ! maekawa 47: if (dl == 0)
! 48: DIVIDE_BY_ZERO;
1.1 maekawa 49:
1.1.1.2 ! maekawa 50: if (ql <= 0)
1.1 maekawa 51: {
1.1.1.2 ! maekawa 52: SIZ (quot) = 0;
1.1 maekawa 53: return;
54: }
55:
1.1.1.2 ! maekawa 56: MPZ_REALLOC (quot, ql);
1.1 maekawa 57:
58: TMP_MARK (marker);
1.1.1.2 ! maekawa 59: qp = PTR (quot);
! 60: rp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
! 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. */
1.1 maekawa 67:
1.1.1.2 ! maekawa 68: /* Copy denominator to temporary space if it overlaps with the quotient. */
! 69: if (dp == qp)
1.1 maekawa 70: {
71: mp_ptr tp;
1.1.1.2 ! maekawa 72: tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
! 73: MPN_COPY (tp, dp, dl);
1.1 maekawa 74: dp = tp;
75: }
1.1.1.2 ! maekawa 76: /* Copy numerator to temporary space if it overlaps with the quotient. */
! 77: if (np == qp)
1.1 maekawa 78: {
1.1.1.2 ! maekawa 79: mp_ptr tp;
! 80: tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
! 81: MPN_COPY (tp, np, nl);
! 82: np = tp;
1.1 maekawa 83: }
84:
1.1.1.2 ! maekawa 85: mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
1.1 maekawa 86:
1.1.1.2 ! maekawa 87: ql -= qp[ql - 1] == 0;
1.1 maekawa 88:
1.1.1.2 ! maekawa 89: SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
1.1 maekawa 90: TMP_FREE (marker);
91: }
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