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1 | /* Optimized version of the standard strcmp() function. |
2 | This file is part of the GNU C Library. | |
581c785b | 3 | Copyright (C) 2000-2022 Free Software Foundation, Inc. |
d5efd131 MF |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
75efb018 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
d5efd131 MF |
18 | |
19 | /* Return: the result of the comparison | |
20 | ||
21 | Inputs: | |
22 | in0: s1 | |
23 | in1: s2 | |
24 | ||
25 | Unlike memcmp(), this function is optimized for mismatches within the | |
26 | first few characters. */ | |
27 | ||
28 | #include <sysdep.h> | |
29 | #undef ret | |
30 | ||
31 | #define s1 in0 | |
32 | #define s2 in1 | |
33 | ||
34 | #define val1 r15 | |
35 | #define val2 r16 | |
36 | ||
37 | ||
38 | ENTRY(strcmp) | |
39 | alloc r2 = ar.pfs, 2, 0, 0, 0 | |
40 | .loop: | |
41 | ld1 val1 = [s1], 1 | |
42 | ld1 val2 = [s2], 1 | |
43 | cmp.eq p6, p0 = r0, r0 // set p6 | |
44 | ;; | |
45 | cmp.ne.and p6, p0 = val1, r0 | |
46 | cmp.ne.and p6, p0 = val2, r0 | |
47 | cmp.eq.and p6, p0 = val1, val2 | |
48 | (p6) br.cond.sptk .loop | |
49 | sub ret0 = val1, val2 | |
50 | br.ret.sptk.many b0 | |
51 | END(strcmp) | |
52 | libc_hidden_builtin_def (strcmp) |