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/* Multiple versions of strlen
Copyright (C) 2009, 2010, 2012 Free Software Foundation, Inc.
Contributed by Intel Corporation.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <init-arch.h>
/* Define multiple versions only for the definition in libc and for the
DSO. In static binaries, we need strlen before the initialization
happened. */
#if defined SHARED && !defined NOT_IN_libc
.text
ENTRY(strlen)
.type strlen, @gnu_indirect_function
pushl %ebx
cfi_adjust_cfa_offset (4)
cfi_rel_offset (ebx, 0)
LOAD_PIC_REG(bx)
cmpl $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
jne 1f
call __init_cpu_features
1: leal __strlen_ia32@GOTOFF(%ebx), %eax
testl $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
jz 2f
leal __strlen_sse2_bsf@GOTOFF(%ebx), %eax
testl $bit_Slow_BSF, FEATURE_OFFSET+index_Slow_BSF+__cpu_features@GOTOFF(%ebx)
jz 2f
leal __strlen_sse2@GOTOFF(%ebx), %eax
2: popl %ebx
cfi_adjust_cfa_offset (-4);
cfi_restore (ebx)
ret
END(strlen)
# undef ENTRY
# define ENTRY(name) \
.type __strlen_ia32, @function; \
.globl __strlen_ia32; \
.p2align 4; \
__strlen_ia32: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size __strlen_ia32, .-__strlen_ia32
# undef libc_hidden_builtin_def
/* IFUNC doesn't work with the hidden functions in shared library since
they will be called without setting up EBX needed for PLT which is
used by IFUNC. */
# define libc_hidden_builtin_def(name) \
.globl __GI_strlen; __GI_strlen = __strlen_ia32
#endif
#include "../../i586/strlen.S"
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