Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpz/tdiv_q_ui.c, Revision 1.1.1.1
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:
4: Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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
9: it under the terms of the GNU Library General Public License as published by
10: the Free Software Foundation; either version 2 of the License, or (at your
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
15: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
16: License for more details.
17:
18: You should have received a copy of the GNU Library General Public License
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: void
27: #if __STDC__
28: mpz_tdiv_q_ui (mpz_ptr quot, mpz_srcptr dividend, unsigned long int divisor)
29: #else
30: mpz_tdiv_q_ui (quot, dividend, divisor)
31: mpz_ptr quot;
32: mpz_srcptr dividend;
33: unsigned long int divisor;
34: #endif
35: {
36: mp_size_t dividend_size;
37: mp_size_t size;
38: mp_ptr quot_ptr;
39:
40: dividend_size = dividend->_mp_size;
41: size = ABS (dividend_size);
42:
43: if (size == 0)
44: {
45: quot->_mp_size = 0;
46: return;
47: }
48:
49: /* No need for temporary allocation and copying if QUOT == DIVIDEND as
50: the divisor is just one limb, and thus no intermediate remainders
51: need to be stored. */
52:
53: if (quot->_mp_alloc < size)
54: _mpz_realloc (quot, size);
55:
56: quot_ptr = quot->_mp_d;
57:
58: mpn_divmod_1 (quot_ptr, dividend->_mp_d, size, (mp_limb_t) divisor);
59:
60: /* The quotient is SIZE limbs, but the most significant might be zero. */
61: size -= quot_ptr[size - 1] == 0;
62: quot->_mp_size = dividend_size >= 0 ? size : -size;
63: }
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