Annotation of OpenXM_contrib/gmp/mpz/tdiv_qr_ui.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpz_tdiv_qr_ui(quot,rem,dividend,short_divisor) --
2: Set QUOT to DIVIDEND / SHORT_DIVISOR
3: and REM to DIVIDEND mod SHORT_DIVISOR.
4:
1.1.1.2 ! maekawa 5: Copyright (C) 1991, 1993, 1994, 1996, 1998 Free Software Foundation, 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: #if __STDC__
29: mpz_tdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
30: #else
31: mpz_tdiv_qr_ui (quot, rem, dividend, divisor)
32: mpz_ptr quot;
33: mpz_ptr rem;
34: mpz_srcptr dividend;
35: unsigned long int divisor;
36: #endif
37: {
38: mp_size_t dividend_size;
39: mp_size_t size;
40: mp_ptr quot_ptr;
41: mp_limb_t remainder_limb;
42:
1.1.1.2 ! maekawa 43: if (divisor == 0)
! 44: DIVIDE_BY_ZERO;
! 45:
1.1 maekawa 46: dividend_size = dividend->_mp_size;
47: size = ABS (dividend_size);
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: remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
1.1.1.2 ! maekawa 59: (mp_limb_t) divisor);
1.1 maekawa 60:
61: if (remainder_limb == 0)
62: rem->_mp_size = 0;
63: else
64: {
65: /* Store the single-limb remainder. We don't check if there's space
66: for just one limb, since no function ever makes zero space. */
67: rem->_mp_size = dividend_size >= 0 ? 1 : -1;
68: rem->_mp_d[0] = remainder_limb;
69: }
70:
71: /* The quotient is SIZE limbs, but the most significant might be zero. */
1.1.1.2 ! maekawa 72: size -= size != 0 && quot_ptr[size - 1] == 0;
1.1 maekawa 73: quot->_mp_size = dividend_size >= 0 ? size : -size;
1.1.1.2 ! maekawa 74:
! 75: return remainder_limb;
1.1 maekawa 76: }
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