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1 | /* Optimized version of the standard strcmp() function. |
2 | This file is part of the GNU C Library. | |
04277e02 | 3 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
d5efd131 MF |
4 | Contributed by Dan Pop <Dan.Pop@cern.ch>. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
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17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
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19 | |
20 | /* Return: the result of the comparison | |
21 | ||
22 | Inputs: | |
23 | in0: s1 | |
24 | in1: s2 | |
25 | ||
26 | Unlike memcmp(), this function is optimized for mismatches within the | |
27 | first few characters. */ | |
28 | ||
29 | #include <sysdep.h> | |
30 | #undef ret | |
31 | ||
32 | #define s1 in0 | |
33 | #define s2 in1 | |
34 | ||
35 | #define val1 r15 | |
36 | #define val2 r16 | |
37 | ||
38 | ||
39 | ENTRY(strcmp) | |
40 | alloc r2 = ar.pfs, 2, 0, 0, 0 | |
41 | .loop: | |
42 | ld1 val1 = [s1], 1 | |
43 | ld1 val2 = [s2], 1 | |
44 | cmp.eq p6, p0 = r0, r0 // set p6 | |
45 | ;; | |
46 | cmp.ne.and p6, p0 = val1, r0 | |
47 | cmp.ne.and p6, p0 = val2, r0 | |
48 | cmp.eq.and p6, p0 = val1, val2 | |
49 | (p6) br.cond.sptk .loop | |
50 | sub ret0 = val1, val2 | |
51 | br.ret.sptk.many b0 | |
52 | END(strcmp) | |
53 | libc_hidden_builtin_def (strcmp) |