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: }
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