Annotation of OpenXM_contrib/gmp/mpz/tdiv_q_ui.c, Revision 1.1.1.3
1.1 maekawa 1: /* mpz_tdiv_q_ui(quot, dividend, divisor_limb)
2: -- Divide DIVIDEND by DIVISOR_LIMB and store the result in QUOT.
3:
1.1.1.3 ! ohara 4: Copyright 1991, 1993, 1994, 1996, 1998, 2001, 2002 Free Software Foundation,
! 5: Inc.
1.1 maekawa 6:
7: This file is part of the GNU MP Library.
8:
9: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2 maekawa 10: it under the terms of the GNU Lesser General Public License as published by
11: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1 maekawa 12: option) any later version.
13:
14: The GNU MP Library is distributed in the hope that it will be useful, but
15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2 maekawa 16: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
1.1 maekawa 17: License for more details.
18:
1.1.1.2 maekawa 19: You should have received a copy of the GNU Lesser General Public License
1.1 maekawa 20: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22: MA 02111-1307, USA. */
23:
24: #include "gmp.h"
25: #include "gmp-impl.h"
26:
1.1.1.2 maekawa 27: unsigned long int
1.1 maekawa 28: mpz_tdiv_q_ui (mpz_ptr quot, mpz_srcptr dividend, unsigned long int divisor)
29: {
1.1.1.3 ! ohara 30: mp_size_t ns, nn, qn;
! 31: mp_ptr np, qp;
! 32: mp_limb_t rl;
1.1.1.2 maekawa 33:
34: if (divisor == 0)
35: DIVIDE_BY_ZERO;
1.1 maekawa 36:
1.1.1.3 ! ohara 37: ns = SIZ(dividend);
! 38: if (ns == 0)
! 39: {
! 40: SIZ(quot) = 0;
! 41: return 0;
! 42: }
! 43:
! 44: nn = ABS(ns);
! 45: MPZ_REALLOC (quot, nn);
! 46: qp = PTR(quot);
! 47: np = PTR(dividend);
! 48:
! 49: #if GMP_NAIL_BITS != 0
! 50: if (divisor > GMP_NUMB_MAX)
! 51: {
! 52: mp_limb_t dp[2], rp[2];
! 53:
! 54: if (nn == 1) /* tdiv_qr requirements; tested above for 0 */
! 55: {
! 56: SIZ(quot) = 0;
! 57: rl = np[0];
! 58: return rl;
! 59: }
! 60:
! 61: dp[0] = divisor & GMP_NUMB_MASK;
! 62: dp[1] = divisor >> GMP_NUMB_BITS;
! 63: mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
! 64: rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
! 65: qn = nn - 2 + 1; qn -= qp[qn - 1] == 0; qn -= qn != 0 && qp[qn - 1] == 0;
! 66: }
! 67: else
! 68: #endif
! 69: {
! 70: rl = mpn_divrem_1 (qp, (mp_size_t) 0, np, nn, (mp_limb_t) divisor);
! 71: qn = nn - (qp[nn - 1] == 0);
! 72: }
1.1.1.2 maekawa 73:
1.1.1.3 ! ohara 74: SIZ(quot) = ns >= 0 ? qn : -qn;
! 75: return rl;
1.1 maekawa 76: }
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