Annotation of OpenXM_contrib/gmp/mpz/fdiv_r_ui.c, Revision 1.1.1.3
1.1 maekawa 1: /* mpz_fdiv_r_ui -- Division rounding the quotient towards -infinity.
2: The remainder gets the same sign as the denominator.
3:
1.1.1.3 ! ohara 4: Copyright 1994, 1995, 1996, 2001, 2002 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:
26: unsigned long int
27: mpz_fdiv_r_ui (mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
28: {
1.1.1.3 ! ohara 29: mp_size_t ns, nn;
! 30: mp_ptr np;
! 31: mp_limb_t rl;
1.1.1.2 maekawa 32:
33: if (divisor == 0)
34: DIVIDE_BY_ZERO;
1.1 maekawa 35:
1.1.1.3 ! ohara 36: ns = SIZ(dividend);
! 37: if (ns == 0)
! 38: {
! 39: SIZ(rem) = 0;
! 40: return 0;
! 41: }
! 42:
! 43: nn = ABS(ns);
! 44: np = PTR(dividend);
! 45: #if GMP_NAIL_BITS != 0
! 46: if (divisor > GMP_NUMB_MAX)
! 47: {
! 48: mp_limb_t dp[2];
! 49: mp_ptr rp, qp;
! 50: mp_size_t rn;
! 51: TMP_DECL (mark);
! 52:
! 53: MPZ_REALLOC (rem, 2);
! 54: rp = PTR(rem);
! 55:
! 56: if (nn == 1) /* tdiv_qr requirements; tested above for 0 */
! 57: {
! 58: rl = np[0];
! 59: rp[0] = rl;
! 60: }
! 61: else
! 62: {
! 63: TMP_MARK (mark);
! 64: dp[0] = divisor & GMP_NUMB_MASK;
! 65: dp[1] = divisor >> GMP_NUMB_BITS;
! 66: qp = TMP_ALLOC_LIMBS (nn - 2 + 1);
! 67: mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
! 68: TMP_FREE (mark);
! 69: rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
! 70: }
! 71:
! 72: if (rl != 0 && ns < 0)
! 73: {
! 74: rl = divisor - rl;
! 75: rp[0] = rl & GMP_NUMB_MASK;
! 76: rp[1] = rl >> GMP_NUMB_BITS;
! 77: }
! 78:
! 79: rn = 1 + (rl > GMP_NUMB_MAX); rn -= (rp[rn - 1] == 0);
! 80: SIZ(rem) = rn;
! 81: }
! 82: else
! 83: #endif
! 84: {
! 85: rl = mpn_mod_1 (np, nn, (mp_limb_t) divisor);
! 86: if (rl == 0)
! 87: SIZ(rem) = 0;
! 88: else
! 89: {
! 90: if (ns < 0)
! 91: rl = divisor - rl;
! 92:
! 93: PTR(rem)[0] = rl;
! 94: SIZ(rem) = 1;
! 95: }
! 96: }
1.1 maekawa 97:
1.1.1.3 ! ohara 98: return rl;
1.1 maekawa 99: }
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