60 lines
1.8 KiB
ArmAsm
60 lines
1.8 KiB
ArmAsm
/* Multiple versions of strchr
|
|
Copyright (C) 2009-2013 Free Software Foundation, Inc.
|
|
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. */
|
|
#ifndef NOT_IN_libc
|
|
.text
|
|
ENTRY(strchr)
|
|
.type strchr, @gnu_indirect_function
|
|
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
|
|
jne 1f
|
|
call __init_cpu_features
|
|
1: leaq __strchr_sse2(%rip), %rax
|
|
2: testl $bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip)
|
|
jz 3f
|
|
leaq __strchr_sse2_no_bsf(%rip), %rax
|
|
3: ret
|
|
END(strchr)
|
|
|
|
|
|
|
|
# undef ENTRY
|
|
# define ENTRY(name) \
|
|
.type __strchr_sse2, @function; \
|
|
.align 16; \
|
|
.globl __strchr_sse2; \
|
|
.hidden __strchr_sse2; \
|
|
__strchr_sse2: cfi_startproc; \
|
|
CALL_MCOUNT
|
|
# undef END
|
|
# define END(name) \
|
|
cfi_endproc; .size __strchr_sse2, .-__strchr_sse2
|
|
# undef libc_hidden_builtin_def
|
|
/* It doesn't make sense to send libc-internal strchr 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_strchr; __GI_strchr = __strchr_sse2
|
|
#endif
|
|
|
|
#include "../strchr.S"
|