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1 | /* mpn_cmp -- Compare two low-level natural-number integers. |
2 | ||
b168057a | 3 | Copyright (C) 1991-2015 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 PE |
18 | along with the GNU MP Library; see the file COPYING.LIB. If not, see |
19 | <http://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 | |
30 | #if __STDC__ | |
31 | mpn_cmp (mp_srcptr op1_ptr, mp_srcptr op2_ptr, mp_size_t size) | |
32 | #else | |
33 | mpn_cmp (op1_ptr, op2_ptr, size) | |
34 | mp_srcptr op1_ptr; | |
35 | mp_srcptr op2_ptr; | |
36 | mp_size_t size; | |
37 | #endif | |
38 | { | |
39 | mp_size_t i; | |
40 | mp_limb_t op1_word, op2_word; | |
41 | ||
42 | for (i = size - 1; i >= 0; i--) | |
43 | { | |
44 | op1_word = op1_ptr[i]; | |
45 | op2_word = op2_ptr[i]; | |
46 | if (op1_word != op2_word) | |
47 | goto diff; | |
48 | } | |
49 | return 0; | |
50 | diff: | |
51 | /* This can *not* be simplified to | |
52 | op2_word - op2_word | |
53 | since that expression might give signed overflow. */ | |
54 | return (op1_word > op2_word) ? 1 : -1; | |
55 | } |