Annotation of OpenXM_contrib/gmp/mpz/tdiv_qr.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpz_tdiv_qr(quot,rem,dividend,divisor) -- Set QUOT to DIVIDEND/DIVISOR,
2: and REM to DIVIDEND mod DIVISOR.
3:
1.1.1.2 ! maekawa 4: Copyright (C) 1991, 1993, 1994, 2000 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:
! 30:
! 31: #ifndef BERKELEY_MP
1.1 maekawa 32:
33: void
34: #if __STDC__
35: mpz_tdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr num, mpz_srcptr den)
36: #else
37: mpz_tdiv_qr (quot, rem, num, den)
38: mpz_ptr quot;
39: mpz_ptr rem;
40: mpz_srcptr num;
41: mpz_srcptr den;
42: #endif
43:
1.1.1.2 ! maekawa 44: #else /* BERKELEY_MP */
! 45:
! 46: void
! 47: #if __STDC__
! 48: mdiv (mpz_srcptr num, mpz_srcptr den, mpz_ptr quot, mpz_ptr rem)
! 49: #else
! 50: mdiv (num, den, quot, rem)
! 51: mpz_srcptr num;
! 52: mpz_srcptr den;
! 53: mpz_ptr quot;
! 54: mpz_ptr rem;
! 55: #endif
! 56:
! 57: #endif /* BERKELEY_MP */
! 58: {
! 59: mp_size_t ql;
! 60: mp_size_t ns, ds, nl, dl;
! 61: mp_ptr np, dp, qp, rp;
! 62: TMP_DECL (marker);
! 63:
! 64: ns = SIZ (num);
! 65: ds = SIZ (den);
! 66: nl = ABS (ns);
! 67: dl = ABS (ds);
! 68: ql = nl - dl + 1;
! 69:
! 70: if (dl == 0)
! 71: DIVIDE_BY_ZERO;
! 72:
! 73: MPZ_REALLOC (rem, dl);
! 74:
! 75: if (ql <= 0)
! 76: {
! 77: if (num != rem)
! 78: {
! 79: mp_ptr np, rp;
! 80: np = PTR (num);
! 81: rp = PTR (rem);
! 82: MPN_COPY (rp, np, nl);
! 83: SIZ (rem) = SIZ (num);
! 84: }
! 85: /* This needs to follow the assignment to rem, in case the
! 86: numerator and quotient are the same. */
! 87: SIZ (quot) = 0;
! 88: return;
! 89: }
! 90:
! 91: MPZ_REALLOC (quot, ql);
! 92:
! 93: TMP_MARK (marker);
! 94: qp = PTR (quot);
! 95: rp = PTR (rem);
! 96: np = PTR (num);
! 97: dp = PTR (den);
! 98:
! 99: /* FIXME: We should think about how to handle the temporary allocation.
! 100: Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
! 101: allocate temp space. */
! 102:
! 103: /* Copy denominator to temporary space if it overlaps with the quotient
! 104: or remainder. */
! 105: if (dp == rp || dp == qp)
! 106: {
! 107: mp_ptr tp;
! 108: tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
! 109: MPN_COPY (tp, dp, dl);
! 110: dp = tp;
! 111: }
! 112: /* Copy numerator to temporary space if it overlaps with the quotient or
! 113: remainder. */
! 114: if (np == rp || np == qp)
! 115: {
! 116: mp_ptr tp;
! 117: tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
! 118: MPN_COPY (tp, np, nl);
! 119: np = tp;
! 120: }
! 121:
! 122: mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
! 123:
! 124: ql -= qp[ql - 1] == 0;
! 125: MPN_NORMALIZE (rp, dl);
! 126:
! 127: SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
! 128: SIZ (rem) = ns >= 0 ? dl : -dl;
! 129: TMP_FREE (marker);
! 130: }
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