1/* mpz_tdiv_ui(dividend, divisor_limb) -- Return DIVDEND mod DIVISOR_LIMB.
2
3Copyright 1991, 1993, 1994, 1996, 1997, 1998, 2001, 2002, 2004, 2005 Free
4Software Foundation, Inc.
5
6This file is part of the GNU MP Library.
7
8The GNU MP Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MP Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
20
21#include "gmp.h"
22#include "gmp-impl.h"
23#include "longlong.h"
24
25unsigned long int
26mpz_tdiv_ui (mpz_srcptr dividend, unsigned long int divisor)
27{
28  mp_size_t ns, nn;
29  mp_ptr np;
30  mp_limb_t rl;
31
32  if (divisor == 0)
33    DIVIDE_BY_ZERO;
34
35  ns = SIZ(dividend);
36  if (ns == 0)
37    {
38      return 0;
39    }
40
41  nn = ABS(ns);
42  np = PTR(dividend);
43
44#if BITS_PER_ULONG > GMP_NUMB_BITS  /* avoid warnings about shift amount */
45  if (divisor > GMP_NUMB_MAX)
46    {
47      mp_limb_t dp[2], rp[2];
48      mp_ptr qp;
49      mp_size_t rn;
50      TMP_DECL;
51
52      if (nn == 1)		/* tdiv_qr requirements; tested above for 0 */
53	{
54	  rl = np[0];
55	  return rl;
56	}
57
58      TMP_MARK;
59      dp[0] = divisor & GMP_NUMB_MASK;
60      dp[1] = divisor >> GMP_NUMB_BITS;
61      qp = TMP_ALLOC_LIMBS (nn - 2 + 1);
62      mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
63      TMP_FREE;
64      rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
65      rn = 2 - (rp[1] == 0);  rn -= (rp[rn - 1] == 0);
66    }
67  else
68#endif
69    {
70      rl = mpn_mod_1 (np, nn, (mp_limb_t) divisor);
71    }
72
73  return rl;
74}
75