Annotation of OpenXM_contrib/gmp/mpz/lcm_ui.c, Revision 1.1.1.1
1.1 ohara 1: /* mpz_lcm_ui -- least common multiple of mpz and 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: #include "gmp.h"
23: #include "gmp-impl.h"
24: #include "longlong.h"
25:
26:
27: void
28: mpz_lcm_ui (mpz_ptr r, mpz_srcptr u, unsigned long v)
29: {
30: mp_size_t usize;
31: mp_srcptr up;
32: mp_ptr rp;
33: unsigned long g;
34: mp_limb_t c;
35:
36: #if GMP_NAIL_BITS != 0
37: if (v > GMP_NUMB_MAX)
38: {
39: mpz_t vz;
40: mp_limb_t vlimbs[2];
41: vlimbs[0] = v & GMP_NUMB_MASK;
42: vlimbs[1] = v >> GMP_NUMB_BITS;
43: PTR(vz) = vlimbs;
44: SIZ(vz) = 2;
45: mpz_lcm (r, u, vz);
46: return;
47: }
48: #endif
49:
50: /* result zero if either operand zero */
51: usize = SIZ(u);
52: if (usize == 0 || v == 0)
53: {
54: SIZ(r) = 0;
55: return;
56: }
57: usize = ABS(usize);
58:
59: MPZ_REALLOC (r, usize+1);
60:
61: up = PTR(u);
62: g = (unsigned long) mpn_gcd_1 (up, usize, (mp_limb_t) v);
63: v /= g;
64:
65: rp = PTR(r);
66: c = mpn_mul_1 (rp, up, usize, (mp_limb_t) v);
67: rp[usize] = c;
68: usize += (c != 0);
69: SIZ(r) = usize;
70: }
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