1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/* strlen(str) -- determine the length of the string STR.
Copyright (C) 2009 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
.text
ENTRY (memchr)
movd %esi, %xmm1
movq %rdi, %rcx
punpcklbw %xmm1, %xmm1
andq $~15, %rdi
punpcklbw %xmm1, %xmm1
orl $0xffffffff, %esi
movdqa (%rdi), %xmm0
pshufd $0, %xmm1, %xmm1
subq %rdi, %rcx
pcmpeqb %xmm1, %xmm0
addq %rcx, %rdx
shl %cl, %esi
pmovmskb %xmm0, %ecx
andl %esi, %ecx
movl $0, %esi
jnz 1f
cmpq %rsi, %rdx
jle 3f
2: movdqa 16(%rdi,%rsi), %xmm0
leaq 16(%rsi), %rsi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %ecx
testl %ecx, %ecx
jnz 1f
cmpq %rsi, %rdx
jg 2b
3: xorl %eax, %eax
ret
1: leaq (%rdi,%rsi), %rax
bsfl %ecx, %ecx
addq %rcx, %rax
addq %rcx, %rsi
cmpq %rsi, %rdx
jle 3b
ret
END (memchr)
strong_alias (memchr, __memchr)
libc_hidden_builtin_def (memchr)
|
