Annotation of OpenXM_contrib/gmp/mpz/dive_ui.c, Revision 1.1.1.1
1.1 ohara 1: /* mpz_divexact_ui -- exact division mpz by ulong.
2:
3: Copyright 2001, 2002 Free Software Foundation, Inc.
4:
5: This file is part of the GNU MP Library.
6:
7: The GNU MP Library is free software; you can redistribute it and/or modify
8: it under the terms of the GNU Lesser General Public License as published by
9: the Free Software Foundation; either version 2.1 of the License, or (at your
10: option) any later version.
11:
12: The GNU MP Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15: License for more details.
16:
17: You should have received a copy of the GNU Lesser General Public License
18: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA.
21: */
22:
23: #include "gmp.h"
24: #include "gmp-impl.h"
25:
26: void
27: mpz_divexact_ui (mpz_ptr dst, mpz_srcptr src, unsigned long divisor)
28: {
29: mp_size_t size, abs_size;
30: mp_ptr dst_ptr;
31:
32: if (divisor == 0)
33: DIVIDE_BY_ZERO;
34:
35: /* For nails don't try to be clever if d is bigger than a limb, just fake
36: up an mpz_t and go to the main mpz_divexact. */
37: if (divisor > GMP_NUMB_MAX)
38: {
39: mp_limb_t dlimbs[2];
40: mpz_t dz;
41: ALLOC(dz) = 2;
42: PTR(dz) = dlimbs;
43: mpz_set_ui (dz, divisor);
44: mpz_divexact (dst, src, dz);
45: return;
46: }
47:
48: size = SIZ(src);
49: if (size == 0)
50: {
51: SIZ(dst) = 0;
52: return;
53: }
54: abs_size = ABS (size);
55:
56: MPZ_REALLOC (dst, abs_size);
57: dst_ptr = PTR(dst);
58:
59: MPN_DIVREM_OR_DIVEXACT_1 (dst_ptr, PTR(src), abs_size, (mp_limb_t) divisor);
60: abs_size -= (dst_ptr[abs_size-1] == 0);
61: SIZ(dst) = (size >= 0 ? abs_size : -abs_size);
62: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>