1/* Multiple versions of strchr
2 Copyright (C) 2009-2017 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
26ENTRY(strchr)
27 .type strchr, @gnu_indirect_function
28 LOAD_RTLD_GLOBAL_RO_RDX
29 leaq __strchr_sse2(%rip), %rax
302: HAS_ARCH_FEATURE (Slow_BSF)
31 jz 3f
32 leaq __strchr_sse2_no_bsf(%rip), %rax
333: ret
34END(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