Line | Count | Source |
1 | | /* mpn_sub_n -- Subtract equal length limb vectors. |
2 | | |
3 | | Copyright 1992-1994, 1996, 2000, 2002, 2009 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 | | |
33 | | |
34 | | #if GMP_NAIL_BITS == 0 |
35 | | |
36 | | mp_limb_t |
37 | | mpn_sub_n (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n) |
38 | 350M | { |
39 | 350M | mp_limb_t ul, vl, sl, rl, cy, cy1, cy2; |
40 | | |
41 | 350M | ASSERT (n >= 1); |
42 | 350M | ASSERT (MPN_SAME_OR_INCR_P (rp, up, n)); |
43 | 350M | ASSERT (MPN_SAME_OR_INCR_P (rp, vp, n)); |
44 | | |
45 | 350M | cy = 0; |
46 | 350M | do |
47 | 12.9G | { |
48 | 12.9G | ul = *up++; |
49 | 12.9G | vl = *vp++; |
50 | 12.9G | sl = ul - vl; |
51 | 12.9G | cy1 = sl > ul; |
52 | 12.9G | rl = sl - cy; |
53 | 12.9G | cy2 = rl > sl; |
54 | 12.9G | cy = cy1 | cy2; |
55 | 12.9G | *rp++ = rl; |
56 | 12.9G | } |
57 | 12.9G | while (--n != 0); |
58 | | |
59 | 350M | return cy; |
60 | 350M | } |
61 | | |
62 | | #endif |
63 | | |
64 | | #if GMP_NAIL_BITS >= 1 |
65 | | |
66 | | mp_limb_t |
67 | | mpn_sub_n (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n) |
68 | | { |
69 | | mp_limb_t ul, vl, rl, cy; |
70 | | |
71 | | ASSERT (n >= 1); |
72 | | ASSERT (MPN_SAME_OR_INCR_P (rp, up, n)); |
73 | | ASSERT (MPN_SAME_OR_INCR_P (rp, vp, n)); |
74 | | |
75 | | cy = 0; |
76 | | do |
77 | | { |
78 | | ul = *up++; |
79 | | vl = *vp++; |
80 | | rl = ul - vl - cy; |
81 | | cy = rl >> (GMP_LIMB_BITS - 1); |
82 | | *rp++ = rl & GMP_NUMB_MASK; |
83 | | } |
84 | | while (--n != 0); |
85 | | |
86 | | return cy; |
87 | | } |
88 | | |
89 | | #endif |