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
174
175
176
177
178
179
180
181
182
183
184
|
/*
* 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 <stddef.h>
#include <stdint.h>
#include <x86intrin.h>
#include "types.h"
#include "unicode.h"
#pragma GCC diagnostic ignored "-Woverflow"
static const int8_t _first_len_tbl[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3,
};
static const int8_t _first_range_tbl[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,
};
static const int8_t _range_min_tbl[] = {
0x00, 0x80, 0x80, 0x80, 0xA0, 0x80, 0x90, 0x80,
0xC2, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F,
};
static const int8_t _range_max_tbl[] = {
0x7F, 0xBF, 0xBF, 0xBF, 0xBF, 0x9F, 0xBF, 0x8F,
0xF4, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
};
static const int8_t _df_ee_tbl[] = {
0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0,
};
static const int8_t _ef_fe_tbl[] = {
0, 3, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
/* Return 0 on success, -1 on error */
bool
utf8_validate_simd(const uchar *s, size_t len)
{
if (len >= 32) {
__m128i prev_input = _mm_set1_epi8(0);
__m128i prev_first_len = _mm_set1_epi8(0);
const __m128i first_len_tbl = _mm_loadu_si128(
(const __m128i *)_first_len_tbl);
const __m128i first_range_tbl = _mm_loadu_si128(
(const __m128i *)_first_range_tbl);
const __m128i range_min_tbl = _mm_loadu_si128(
(const __m128i *)_range_min_tbl);
const __m128i range_max_tbl = _mm_loadu_si128(
(const __m128i *)_range_max_tbl);
const __m128i df_ee_tbl = _mm_loadu_si128((const __m128i *)_df_ee_tbl);
const __m128i ef_fe_tbl = _mm_loadu_si128((const __m128i *)_ef_fe_tbl);
__m128i error = _mm_set1_epi8(0);
while (len >= 32) {
/***************************** block 1 ****************************/
const __m128i input_a = _mm_loadu_si128((const __m128i *)s);
__m128i high_nibbles = _mm_and_si128(_mm_srli_epi16(input_a, 4),
_mm_set1_epi8(0x0F));
__m128i first_len_a = _mm_shuffle_epi8(first_len_tbl, high_nibbles);
__m128i range_a = _mm_shuffle_epi8(first_range_tbl, high_nibbles);
range_a = _mm_or_si128(
range_a, _mm_alignr_epi8(first_len_a, prev_first_len, 15));
__m128i tmp;
tmp = _mm_alignr_epi8(first_len_a, prev_first_len, 14);
tmp = _mm_subs_epu8(tmp, _mm_set1_epi8(1));
range_a = _mm_or_si128(range_a, tmp);
tmp = _mm_alignr_epi8(first_len_a, prev_first_len, 13);
tmp = _mm_subs_epu8(tmp, _mm_set1_epi8(2));
range_a = _mm_or_si128(range_a, tmp);
__m128i shift1, pos, range2;
shift1 = _mm_alignr_epi8(input_a, prev_input, 15);
pos = _mm_sub_epi8(shift1, _mm_set1_epi8(0xEF));
tmp = _mm_subs_epu8(pos, _mm_set1_epi8(0xF0));
range2 = _mm_shuffle_epi8(df_ee_tbl, tmp);
tmp = _mm_adds_epu8(pos, _mm_set1_epi8(0x70));
range2 = _mm_add_epi8(range2, _mm_shuffle_epi8(ef_fe_tbl, tmp));
range_a = _mm_add_epi8(range_a, range2);
__m128i minv = _mm_shuffle_epi8(range_min_tbl, range_a);
__m128i maxv = _mm_shuffle_epi8(range_max_tbl, range_a);
tmp = _mm_or_si128(_mm_cmplt_epi8(input_a, minv),
_mm_cmpgt_epi8(input_a, maxv));
error = _mm_or_si128(error, tmp);
/***************************** block 2 ****************************/
const __m128i input_b = _mm_loadu_si128((const __m128i *)(s + 16));
high_nibbles = _mm_and_si128(_mm_srli_epi16(input_b, 4),
_mm_set1_epi8(0x0F));
__m128i first_len_b = _mm_shuffle_epi8(first_len_tbl, high_nibbles);
__m128i range_b = _mm_shuffle_epi8(first_range_tbl, high_nibbles);
range_b = _mm_or_si128(
range_b, _mm_alignr_epi8(first_len_b, first_len_a, 15));
tmp = _mm_alignr_epi8(first_len_b, first_len_a, 14);
tmp = _mm_subs_epu8(tmp, _mm_set1_epi8(1));
range_b = _mm_or_si128(range_b, tmp);
tmp = _mm_alignr_epi8(first_len_b, first_len_a, 13);
tmp = _mm_subs_epu8(tmp, _mm_set1_epi8(2));
range_b = _mm_or_si128(range_b, tmp);
shift1 = _mm_alignr_epi8(input_b, input_a, 15);
pos = _mm_sub_epi8(shift1, _mm_set1_epi8(0xEF));
tmp = _mm_subs_epu8(pos, _mm_set1_epi8(0xF0));
range2 = _mm_shuffle_epi8(df_ee_tbl, tmp);
tmp = _mm_adds_epu8(pos, _mm_set1_epi8(0x70));
range2 = _mm_add_epi8(range2, _mm_shuffle_epi8(ef_fe_tbl, tmp));
range_b = _mm_add_epi8(range_b, range2);
minv = _mm_shuffle_epi8(range_min_tbl, range_b);
maxv = _mm_shuffle_epi8(range_max_tbl, range_b);
tmp = _mm_or_si128(_mm_cmplt_epi8(input_b, minv),
_mm_cmpgt_epi8(input_b, maxv));
error = _mm_or_si128(error, tmp);
/************************ next iteration **************************/
prev_input = input_b;
prev_first_len = first_len_b;
s += 32;
len -= 32;
}
if (!_mm_testz_si128(error, error))
return false;
int32_t token4 = _mm_extract_epi32(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;
}
|
