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b6ab06ce UD |
1 | /* mpn_cmp -- Compare two low-level natural-number integers. |
2 | ||
581c785b | 3 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
b6ab06ce UD |
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 | |
59ba27a6 | 18 | along with the GNU MP Library; see the file COPYING.LIB. If not, see |
5a82c748 | 19 | <https://www.gnu.org/licenses/>. */ |
b6ab06ce UD |
20 | |
21 | #include <gmp.h> | |
22 | #include "gmp-impl.h" | |
23 | ||
24 | /* Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE. | |
25 | There are no restrictions on the relative sizes of | |
26 | the two arguments. | |
27 | Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2. */ | |
28 | ||
29 | int | |
b6ab06ce | 30 | mpn_cmp (mp_srcptr op1_ptr, mp_srcptr op2_ptr, mp_size_t size) |
b6ab06ce UD |
31 | { |
32 | mp_size_t i; | |
33 | mp_limb_t op1_word, op2_word; | |
34 | ||
35 | for (i = size - 1; i >= 0; i--) | |
36 | { | |
37 | op1_word = op1_ptr[i]; | |
38 | op2_word = op2_ptr[i]; | |
39 | if (op1_word != op2_word) | |
40 | goto diff; | |
41 | } | |
42 | return 0; | |
43 | diff: | |
44 | /* This can *not* be simplified to | |
45 | op2_word - op2_word | |
46 | since that expression might give signed overflow. */ | |
47 | return (op1_word > op2_word) ? 1 : -1; | |
48 | } |