1 /* Multiple versions of strchr
2 Copyright (C) 2009-2014 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #include <init-arch.h>
23 /* Define multiple versions only for the definition in libc. */
27 .type strchr, @gnu_indirect_function
28 cmpl $0, __cpu_features+KIND_OFFSET(%rip)
30 call __init_cpu_features
31 1: leaq __strchr_sse2(%rip), %rax
32 2: testl $bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip)
34 leaq __strchr_sse2_no_bsf(%rip), %rax
41 # define ENTRY(name) \
42 .type __strchr_sse2, @function; \
44 .globl __strchr_sse2; \
45 .hidden __strchr_sse2; \
46 __strchr_sse2: cfi_startproc; \
50 cfi_endproc; .size __strchr_sse2, .-__strchr_sse2
51 # undef libc_hidden_builtin_def
52 /* It doesn't make sense to send libc-internal strchr calls through a PLT.
53 The speedup we get from using SSE4.2 instruction is likely eaten away
54 by the indirect call in the PLT. */
55 # define libc_hidden_builtin_def(name) \
56 .globl __GI_strchr; __GI_strchr = __strchr_sse2
59 #include "../strchr.S"