1 | /* Multiple versions of strchr |
2 | Copyright (C) 2009-2016 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
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 |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <sysdep.h> |
20 | #include <init-arch.h> |
21 | |
22 | |
23 | /* Define multiple versions only for the definition in libc. */ |
24 | #if IS_IN (libc) |
25 | .text |
26 | ENTRY(strchr) |
27 | .type strchr, @gnu_indirect_function |
28 | LOAD_RTLD_GLOBAL_RO_RDX |
29 | leaq __strchr_sse2(%rip), %rax |
30 | 2: HAS_ARCH_FEATURE (Slow_BSF) |
31 | jz 3f |
32 | leaq __strchr_sse2_no_bsf(%rip), %rax |
33 | 3: ret |
34 | END(strchr) |
35 | |
36 | |
37 | |
38 | # undef ENTRY |
39 | # define ENTRY(name) \ |
40 | .type __strchr_sse2, @function; \ |
41 | .align 16; \ |
42 | .globl __strchr_sse2; \ |
43 | .hidden __strchr_sse2; \ |
44 | __strchr_sse2: cfi_startproc; \ |
45 | CALL_MCOUNT |
46 | # undef END |
47 | # define END(name) \ |
48 | cfi_endproc; .size __strchr_sse2, .-__strchr_sse2 |
49 | # undef libc_hidden_builtin_def |
50 | /* It doesn't make sense to send libc-internal strchr calls through a PLT. |
51 | The speedup we get from using SSE4.2 instruction is likely eaten away |
52 | by the indirect call in the PLT. */ |
53 | # define libc_hidden_builtin_def(name) \ |
54 | .globl __GI_strchr; __GI_strchr = __strchr_sse2 |
55 | #endif |
56 | |
57 | #include "../strchr.S" |
58 | |