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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/* wcschr optimized with SSE2.
Copyright (C) 2017-2023 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
<https://www.gnu.org/licenses/>. */
#include <isa-level.h>
/* ISA level >= 2 because there is no wcschr-sse4 implementations. */
#if ISA_SHOULD_BUILD (2)
# ifndef WCSCHR
# define WCSCHR __wcschr_sse2
# endif
# include <sysdep.h>
.text
ENTRY (WCSCHR)
movd %rsi, %xmm1
pxor %xmm2, %xmm2
mov %rdi, %rcx
punpckldq %xmm1, %xmm1
punpckldq %xmm1, %xmm1
and $63, %rcx
cmp $48, %rcx
ja L(cross_cache)
movdqu (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rdx
pmovmskb %xmm0, %rax
or %rax, %rdx
jnz L(matches)
and $-16, %rdi
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rdx
pmovmskb %xmm0, %rax
or %rax, %rdx
jnz L(matches)
jmp L(loop)
L(cross_cache):
and $15, %rcx
and $-16, %rdi
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rdx
pmovmskb %xmm0, %rax
sar %cl, %rdx
sar %cl, %rax
test %rax, %rax
je L(unaligned_no_match)
bsf %rax, %rax
test %rdx, %rdx
je L(unaligned_match)
bsf %rdx, %rdx
cmp %rdx, %rax
ja L(return_null)
L(unaligned_match):
add %rdi, %rax
add %rcx, %rax
ret
.p2align 4
L(unaligned_no_match):
test %rdx, %rdx
jne L(return_null)
pxor %xmm2, %xmm2
add $16, %rdi
.p2align 4
/* Loop start on aligned string. */
L(loop):
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rdx
pmovmskb %xmm0, %rax
or %rax, %rdx
jnz L(matches)
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rdx
pmovmskb %xmm0, %rax
or %rax, %rdx
jnz L(matches)
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rdx
pmovmskb %xmm0, %rax
or %rax, %rdx
jnz L(matches)
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rdx
pmovmskb %xmm0, %rax
or %rax, %rdx
jnz L(matches)
jmp L(loop)
.p2align 4
L(matches):
pmovmskb %xmm2, %rdx
test %rax, %rax
jz L(return_null)
bsf %rax, %rax
test %rdx, %rdx
je L(match)
bsf %rdx, %rcx
cmp %rcx, %rax
ja L(return_null)
L(match):
sub $16, %rdi
add %rdi, %rax
ret
.p2align 4
L(return_null):
xor %rax, %rax
ret
END (WCSCHR)
#endif
|
