Annotation of OpenXM_contrib/gmp/mpz/tdiv_q_ui.c, Revision 1.1.1.2
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:
1.1.1.2 ! maekawa 4: Copyright (C) 1991, 1993, 1994, 1996, 1998 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:
1.1.1.2 ! maekawa 26: unsigned long int
1.1 maekawa 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;
1.1.1.2 ! maekawa 39: mp_limb_t remainder_limb;
! 40:
! 41: if (divisor == 0)
! 42: DIVIDE_BY_ZERO;
1.1 maekawa 43:
44: dividend_size = dividend->_mp_size;
45: size = ABS (dividend_size);
46:
47: /* No need for temporary allocation and copying if QUOT == DIVIDEND as
48: the divisor is just one limb, and thus no intermediate remainders
49: need to be stored. */
50:
51: if (quot->_mp_alloc < size)
52: _mpz_realloc (quot, size);
53:
54: quot_ptr = quot->_mp_d;
55:
1.1.1.2 ! maekawa 56: remainder_limb
! 57: = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size, (mp_limb_t) divisor);
1.1 maekawa 58:
59: /* The quotient is SIZE limbs, but the most significant might be zero. */
1.1.1.2 ! maekawa 60: size -= size != 0 && quot_ptr[size - 1] == 0;
1.1 maekawa 61: quot->_mp_size = dividend_size >= 0 ? size : -size;
1.1.1.2 ! maekawa 62:
! 63: return remainder_limb;
1.1 maekawa 64: }
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