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
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* strchr (str, ch) -- Return pointer to first occurrence of CH in STR.
For AMD x86-64.
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>
.text
ENTRY (strchr)
#ifdef __CHKP__
bndcl (%rdi), %bnd0
bndcu (%rdi), %bnd0
#endif
movd %esi, %xmm1
movq %rdi, %rcx
punpcklbw %xmm1, %xmm1
andq $~15, %rdi
pxor %xmm2, %xmm2
punpcklbw %xmm1, %xmm1
orl $0xffffffff, %esi
#ifdef __CHKP__
bndcu (%rdi), %bnd0
#endif
movdqa (%rdi), %xmm0
pshufd $0, %xmm1, %xmm1
subq %rdi, %rcx
movdqa %xmm0, %xmm3
leaq 16(%rdi), %rdi
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
shl %cl, %esi
pmovmskb %xmm0, %edx
pmovmskb %xmm3, %ecx
andl %esi, %edx
andl %esi, %ecx
orl %edx, %ecx
jnz 1f
2:
#ifdef __CHKP__
bndcu (%rdi), %bnd0
#endif
movdqa (%rdi), %xmm0
leaq 16(%rdi), %rdi
movdqa %xmm0, %xmm3
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
pmovmskb %xmm0, %edx
pmovmskb %xmm3, %ecx
orl %edx, %ecx
jz 2b
1: bsfl %edx, %edx
jz 4f
bsfl %ecx, %ecx
leaq -16(%rdi,%rdx), %rax
cmpl %edx, %ecx
je 5f
4: xorl %eax, %eax
5: ret
END (strchr)
weak_alias (strchr, index)
libc_hidden_builtin_def (strchr)
|
