Line | Count | Source |
1 | | /* mpz_lcm_ui -- least common multiple of mpz and ulong. |
2 | | |
3 | | Copyright 2001, 2002, 2004 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 either: |
9 | | |
10 | | * the GNU Lesser General Public License as published by the Free |
11 | | Software Foundation; either version 3 of the License, or (at your |
12 | | option) any later version. |
13 | | |
14 | | or |
15 | | |
16 | | * the GNU General Public License as published by the Free Software |
17 | | Foundation; either version 2 of the License, or (at your option) any |
18 | | later version. |
19 | | |
20 | | or both in parallel, as here. |
21 | | |
22 | | The GNU MP Library is distributed in the hope that it will be useful, but |
23 | | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
24 | | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
25 | | for more details. |
26 | | |
27 | | You should have received copies of the GNU General Public License and the |
28 | | GNU Lesser General Public License along with the GNU MP Library. If not, |
29 | | see https://www.gnu.org/licenses/. */ |
30 | | |
31 | | #include "gmp-impl.h" |
32 | | #include "longlong.h" |
33 | | |
34 | | |
35 | | void |
36 | | mpz_lcm_ui (mpz_ptr r, mpz_srcptr u, unsigned long v) |
37 | 9 | { |
38 | 9 | mp_size_t usize; |
39 | 9 | mp_srcptr up; |
40 | 9 | mp_ptr rp; |
41 | 9 | unsigned long g; |
42 | 9 | mp_limb_t c; |
43 | | |
44 | | #if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */ |
45 | | if (v > GMP_NUMB_MAX) |
46 | | { |
47 | | mpz_t vz; |
48 | | mp_limb_t vlimbs[2]; |
49 | | vlimbs[0] = v & GMP_NUMB_MASK; |
50 | | vlimbs[1] = v >> GMP_NUMB_BITS; |
51 | | PTR(vz) = vlimbs; |
52 | | SIZ(vz) = 2; |
53 | | mpz_lcm (r, u, vz); |
54 | | return; |
55 | | } |
56 | | #endif |
57 | | |
58 | | /* result zero if either operand zero */ |
59 | 9 | usize = SIZ(u); |
60 | 9 | if (usize == 0 || v == 0) |
61 | 1 | { |
62 | 1 | SIZ(r) = 0; |
63 | 1 | return; |
64 | 1 | } |
65 | 8 | usize = ABS(usize); |
66 | | |
67 | 8 | MPZ_REALLOC (r, usize+1); |
68 | | |
69 | 8 | up = PTR(u); |
70 | 8 | g = (unsigned long) mpn_gcd_1 (up, usize, (mp_limb_t) v); |
71 | 8 | v /= g; |
72 | | |
73 | 8 | rp = PTR(r); |
74 | 8 | c = mpn_mul_1 (rp, up, usize, (mp_limb_t) v); |
75 | 8 | rp[usize] = c; |
76 | 8 | usize += (c != 0); |
77 | 8 | SIZ(r) = usize; |
78 | 8 | } |