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
163
164
165
166
167
168
169
170
171
172
173
|
/*
* MIT License
*
* Copyright © 2019 Yibo Cai
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Source: https://github.com/cyb70289/utf8
*/
#include <arm_neon.h>
#include <stdint.h>
#include "types.h"
#include "unicode.h"
#pragma GCC diagnostic ignored "-Woverflow"
static const uint8_t _first_len_tbl[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3,
};
static const uint8_t _first_range_tbl[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,
};
static const uint8_t _range_min_tbl[] = {
0x00, 0x80, 0x80, 0x80, 0xA0, 0x80, 0x90, 0x80,
0xC2, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
};
static const uint8_t _range_max_tbl[] = {
0x7F, 0xBF, 0xBF, 0xBF, 0xBF, 0x9F, 0xBF, 0x8F,
0xF4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static const uint8_t _range_adjust_tbl[] = {
2, 3, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0,
};
bool
utf8_validate_simd(const uchar *s, size_t len)
{
if (len >= 32) {
uint8x16_t prev_input = vdupq_n_u8(0);
uint8x16_t prev_first_len = vdupq_n_u8(0);
const uint8x16_t first_len_tbl = vld1q_u8(_first_len_tbl);
const uint8x16_t first_range_tbl = vld1q_u8(_first_range_tbl);
const uint8x16_t range_min_tbl = vld1q_u8(_range_min_tbl);
const uint8x16_t range_max_tbl = vld1q_u8(_range_max_tbl);
const uint8x16x2_t range_adjust_tbl = vld2q_u8(_range_adjust_tbl);
const uint8x16_t const_1 = vdupq_n_u8(1);
const uint8x16_t const_2 = vdupq_n_u8(2);
const uint8x16_t const_e0 = vdupq_n_u8(0xE0);
uint8x16_t error1 = vdupq_n_u8(0);
uint8x16_t error2 = vdupq_n_u8(0);
uint8x16_t error3 = vdupq_n_u8(0);
uint8x16_t error4 = vdupq_n_u8(0);
while (len >= 32) {
#if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ < 8)
/* GCC doesn't support vldq1_u8_x2 until version 8 */
const uint8x16_t input_a = vld1q_u8(data);
const uint8x16_t input_b = vld1q_u8(data + 16);
#else
/* Forces a double load on Clang */
const uint8x16x2_t input_pair = vld1q_u8_x2(s);
const uint8x16_t input_a = input_pair.val[0];
const uint8x16_t input_b = input_pair.val[1];
#endif
const uint8x16_t high_nibbles_a = vshrq_n_u8(input_a, 4);
const uint8x16_t high_nibbles_b = vshrq_n_u8(input_b, 4);
const uint8x16_t first_len_a = vqtbl1q_u8(first_len_tbl,
high_nibbles_a);
const uint8x16_t first_len_b = vqtbl1q_u8(first_len_tbl,
high_nibbles_b);
uint8x16_t range_a = vqtbl1q_u8(first_range_tbl, high_nibbles_a);
uint8x16_t range_b = vqtbl1q_u8(first_range_tbl, high_nibbles_b);
range_a = vorrq_u8(range_a,
vextq_u8(prev_first_len, first_len_a, 15));
range_b = vorrq_u8(range_b, vextq_u8(first_len_a, first_len_b, 15));
uint8x16_t tmp1_a, tmp2_a, tmp1_b, tmp2_b;
tmp1_a = vextq_u8(prev_first_len, first_len_a, 14);
tmp1_a = vqsubq_u8(tmp1_a, const_1);
range_a = vorrq_u8(range_a, tmp1_a);
tmp1_b = vextq_u8(first_len_a, first_len_b, 14);
tmp1_b = vqsubq_u8(tmp1_b, const_1);
range_b = vorrq_u8(range_b, tmp1_b);
tmp2_a = vextq_u8(prev_first_len, first_len_a, 13);
tmp2_a = vqsubq_u8(tmp2_a, const_2);
range_a = vorrq_u8(range_a, tmp2_a);
tmp2_b = vextq_u8(first_len_a, first_len_b, 13);
tmp2_b = vqsubq_u8(tmp2_b, const_2);
range_b = vorrq_u8(range_b, tmp2_b);
uint8x16_t shift1_a = vextq_u8(prev_input, input_a, 15);
uint8x16_t pos_a = vsubq_u8(shift1_a, const_e0);
range_a = vaddq_u8(range_a, vqtbl2q_u8(range_adjust_tbl, pos_a));
uint8x16_t shift1_b = vextq_u8(input_a, input_b, 15);
uint8x16_t pos_b = vsubq_u8(shift1_b, const_e0);
range_b = vaddq_u8(range_b, vqtbl2q_u8(range_adjust_tbl, pos_b));
uint8x16_t minv_a = vqtbl1q_u8(range_min_tbl, range_a);
uint8x16_t maxv_a = vqtbl1q_u8(range_max_tbl, range_a);
uint8x16_t minv_b = vqtbl1q_u8(range_min_tbl, range_b);
uint8x16_t maxv_b = vqtbl1q_u8(range_max_tbl, range_b);
error1 = vorrq_u8(error1, vcltq_u8(input_a, minv_a));
error2 = vorrq_u8(error2, vcgtq_u8(input_a, maxv_a));
error3 = vorrq_u8(error3, vcltq_u8(input_b, minv_b));
error4 = vorrq_u8(error4, vcgtq_u8(input_b, maxv_b));
prev_input = input_b;
prev_first_len = first_len_b;
s += 32;
len -= 32;
}
error1 = vorrq_u8(error1, error2);
error1 = vorrq_u8(error1, error3);
error1 = vorrq_u8(error1, error4);
if (vmaxvq_u8(error1))
return -1;
uint32_t token4;
vst1q_lane_u32(&token4, vreinterpretq_u32_u8(prev_input), 3);
const int8_t *token = (const int8_t *)&token4;
int lookahead = 0;
if (token[3] > (int8_t)0xBF)
lookahead = 1;
else if (token[2] > (int8_t)0xBF)
lookahead = 2;
else if (token[1] > (int8_t)0xBF)
lookahead = 3;
s -= lookahead;
len += lookahead;
}
return utf8_validate_off(s, len) == 0;
}
|
