mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
66 lines
2.2 KiB
ArmAsm
66 lines
2.2 KiB
ArmAsm
/* strlen(str) -- determine the length of the string STR.
|
|
Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>.
|
|
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
|
|
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
|
|
jne 1f
|
|
call __init_cpu_features
|
|
1: leaq __strlen_sse2_pminub(%rip), %rax
|
|
testl $bit_Prefer_PMINUB_for_stringop, __cpu_features+FEATURE_OFFSET+index_Prefer_PMINUB_for_stringop(%rip)
|
|
jnz 2f
|
|
leaq __strlen_sse2(%rip), %rax
|
|
testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
|
|
jz 2f
|
|
leaq __strlen_sse42(%rip), %rax
|
|
ret
|
|
2: testl $bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip)
|
|
jz 3f
|
|
leaq __strlen_sse2_no_bsf(%rip), %rax
|
|
3: ret
|
|
END(strlen)
|
|
|
|
# undef ENTRY
|
|
# define ENTRY(name) \
|
|
.type __strlen_sse2, @function; \
|
|
.align 16; \
|
|
__strlen_sse2: cfi_startproc; \
|
|
CALL_MCOUNT
|
|
# undef END
|
|
# define END(name) \
|
|
cfi_endproc; .size __strlen_sse2, .-__strlen_sse2
|
|
# undef libc_hidden_builtin_def
|
|
/* It doesn't make sense to send libc-internal strlen calls through a PLT.
|
|
The speedup we get from using SSE4.2 instruction is likely eaten away
|
|
by the indirect call in the PLT. */
|
|
# define libc_hidden_builtin_def(name) \
|
|
.globl __GI_strlen; __GI_strlen = __strlen_sse2
|
|
#endif
|
|
|
|
#include "../strlen.S"
|