Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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278 lines
10 KiB
278 lines
10 KiB
2 years ago
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#ifdef __AVX2__
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#include <stdio.h>
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#include <stdint.h>
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#include <x86intrin.h>
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int utf8_naive(const unsigned char *data, int len);
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#if 0
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static void print256(const char *s, const __m256i v256)
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{
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const unsigned char *v8 = (const unsigned char *)&v256;
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if (s)
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printf("%s:\t", s);
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for (int i = 0; i < 32; i++)
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printf("%02x ", v8[i]);
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printf("\n");
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}
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#endif
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/*
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* Map high nibble of "First Byte" to legal character length minus 1
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* 0x00 ~ 0xBF --> 0
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* 0xC0 ~ 0xDF --> 1
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* 0xE0 ~ 0xEF --> 2
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* 0xF0 ~ 0xFF --> 3
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*/
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static const int8_t _first_len_tbl[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3,
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};
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/* Map "First Byte" to 8-th item of range table (0xC2 ~ 0xF4) */
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static const int8_t _first_range_tbl[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,
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};
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/*
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* Range table, map range index to min and max values
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* Index 0 : 00 ~ 7F (First Byte, ascii)
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* Index 1,2,3: 80 ~ BF (Second, Third, Fourth Byte)
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* Index 4 : A0 ~ BF (Second Byte after E0)
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* Index 5 : 80 ~ 9F (Second Byte after ED)
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* Index 6 : 90 ~ BF (Second Byte after F0)
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* Index 7 : 80 ~ 8F (Second Byte after F4)
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* Index 8 : C2 ~ F4 (First Byte, non ascii)
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* Index 9~15 : illegal: i >= 127 && i <= -128
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*/
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static const int8_t _range_min_tbl[] = {
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0x00, 0x80, 0x80, 0x80, 0xA0, 0x80, 0x90, 0x80,
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0xC2, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F,
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0x00, 0x80, 0x80, 0x80, 0xA0, 0x80, 0x90, 0x80,
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0xC2, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F,
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};
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static const int8_t _range_max_tbl[] = {
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0x7F, 0xBF, 0xBF, 0xBF, 0xBF, 0x9F, 0xBF, 0x8F,
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0xF4, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x7F, 0xBF, 0xBF, 0xBF, 0xBF, 0x9F, 0xBF, 0x8F,
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0xF4, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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};
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/*
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* Tables for fast handling of four special First Bytes(E0,ED,F0,F4), after
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* which the Second Byte are not 80~BF. It contains "range index adjustment".
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* +------------+---------------+------------------+----------------+
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* | First Byte | original range| range adjustment | adjusted range |
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* +------------+---------------+------------------+----------------+
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* | E0 | 2 | 2 | 4 |
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* +------------+---------------+------------------+----------------+
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* | ED | 2 | 3 | 5 |
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* +------------+---------------+------------------+----------------+
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* | F0 | 3 | 3 | 6 |
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* +------------+---------------+------------------+----------------+
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* | F4 | 4 | 4 | 8 |
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* +------------+---------------+------------------+----------------+
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*/
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/* index1 -> E0, index14 -> ED */
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static const int8_t _df_ee_tbl[] = {
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0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0,
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0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0,
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};
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/* index1 -> F0, index5 -> F4 */
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static const int8_t _ef_fe_tbl[] = {
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0, 3, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 3, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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#define RET_ERR_IDX 0 /* Define 1 to return index of first error char */
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static inline __m256i push_last_byte_of_a_to_b(__m256i a, __m256i b) {
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return _mm256_alignr_epi8(b, _mm256_permute2x128_si256(a, b, 0x21), 15);
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}
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static inline __m256i push_last_2bytes_of_a_to_b(__m256i a, __m256i b) {
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return _mm256_alignr_epi8(b, _mm256_permute2x128_si256(a, b, 0x21), 14);
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}
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static inline __m256i push_last_3bytes_of_a_to_b(__m256i a, __m256i b) {
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return _mm256_alignr_epi8(b, _mm256_permute2x128_si256(a, b, 0x21), 13);
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}
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/* 5x faster than naive method */
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/* Return 0 - success, -1 - error, >0 - first error char(if RET_ERR_IDX = 1) */
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int utf8_range_avx2(const unsigned char *data, int len)
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{
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#if RET_ERR_IDX
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int err_pos = 1;
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#endif
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if (len >= 32) {
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__m256i prev_input = _mm256_set1_epi8(0);
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__m256i prev_first_len = _mm256_set1_epi8(0);
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/* Cached tables */
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const __m256i first_len_tbl =
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_mm256_loadu_si256((const __m256i *)_first_len_tbl);
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const __m256i first_range_tbl =
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_mm256_loadu_si256((const __m256i *)_first_range_tbl);
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const __m256i range_min_tbl =
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_mm256_loadu_si256((const __m256i *)_range_min_tbl);
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const __m256i range_max_tbl =
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_mm256_loadu_si256((const __m256i *)_range_max_tbl);
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const __m256i df_ee_tbl =
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_mm256_loadu_si256((const __m256i *)_df_ee_tbl);
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const __m256i ef_fe_tbl =
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_mm256_loadu_si256((const __m256i *)_ef_fe_tbl);
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#if !RET_ERR_IDX
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__m256i error1 = _mm256_set1_epi8(0);
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__m256i error2 = _mm256_set1_epi8(0);
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#endif
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while (len >= 32) {
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const __m256i input = _mm256_loadu_si256((const __m256i *)data);
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/* high_nibbles = input >> 4 */
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const __m256i high_nibbles =
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_mm256_and_si256(_mm256_srli_epi16(input, 4), _mm256_set1_epi8(0x0F));
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/* first_len = legal character length minus 1 */
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/* 0 for 00~7F, 1 for C0~DF, 2 for E0~EF, 3 for F0~FF */
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/* first_len = first_len_tbl[high_nibbles] */
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__m256i first_len = _mm256_shuffle_epi8(first_len_tbl, high_nibbles);
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/* First Byte: set range index to 8 for bytes within 0xC0 ~ 0xFF */
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/* range = first_range_tbl[high_nibbles] */
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__m256i range = _mm256_shuffle_epi8(first_range_tbl, high_nibbles);
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/* Second Byte: set range index to first_len */
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/* 0 for 00~7F, 1 for C0~DF, 2 for E0~EF, 3 for F0~FF */
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/* range |= (first_len, prev_first_len) << 1 byte */
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range = _mm256_or_si256(
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range, push_last_byte_of_a_to_b(prev_first_len, first_len));
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/* Third Byte: set range index to saturate_sub(first_len, 1) */
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/* 0 for 00~7F, 0 for C0~DF, 1 for E0~EF, 2 for F0~FF */
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__m256i tmp1, tmp2;
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/* tmp1 = (first_len, prev_first_len) << 2 bytes */
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tmp1 = push_last_2bytes_of_a_to_b(prev_first_len, first_len);
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/* tmp2 = saturate_sub(tmp1, 1) */
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tmp2 = _mm256_subs_epu8(tmp1, _mm256_set1_epi8(1));
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/* range |= tmp2 */
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range = _mm256_or_si256(range, tmp2);
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/* Fourth Byte: set range index to saturate_sub(first_len, 2) */
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/* 0 for 00~7F, 0 for C0~DF, 0 for E0~EF, 1 for F0~FF */
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/* tmp1 = (first_len, prev_first_len) << 3 bytes */
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tmp1 = push_last_3bytes_of_a_to_b(prev_first_len, first_len);
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/* tmp2 = saturate_sub(tmp1, 2) */
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tmp2 = _mm256_subs_epu8(tmp1, _mm256_set1_epi8(2));
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/* range |= tmp2 */
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range = _mm256_or_si256(range, tmp2);
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/*
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* Now we have below range indices caluclated
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* Correct cases:
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* - 8 for C0~FF
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* - 3 for 1st byte after F0~FF
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* - 2 for 1st byte after E0~EF or 2nd byte after F0~FF
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* - 1 for 1st byte after C0~DF or 2nd byte after E0~EF or
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* 3rd byte after F0~FF
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* - 0 for others
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* Error cases:
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* 9,10,11 if non ascii First Byte overlaps
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* E.g., F1 80 C2 90 --> 8 3 10 2, where 10 indicates error
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*/
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/* Adjust Second Byte range for special First Bytes(E0,ED,F0,F4) */
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/* Overlaps lead to index 9~15, which are illegal in range table */
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__m256i shift1, pos, range2;
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/* shift1 = (input, prev_input) << 1 byte */
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shift1 = push_last_byte_of_a_to_b(prev_input, input);
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pos = _mm256_sub_epi8(shift1, _mm256_set1_epi8(0xEF));
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/*
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* shift1: | EF F0 ... FE | FF 00 ... ... DE | DF E0 ... EE |
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* pos: | 0 1 15 | 16 17 239| 240 241 255|
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* pos-240: | 0 0 0 | 0 0 0 | 0 1 15 |
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* pos+112: | 112 113 127| >= 128 | >= 128 |
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*/
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tmp1 = _mm256_subs_epu8(pos, _mm256_set1_epi8(240));
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range2 = _mm256_shuffle_epi8(df_ee_tbl, tmp1);
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tmp2 = _mm256_adds_epu8(pos, _mm256_set1_epi8(112));
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range2 = _mm256_add_epi8(range2, _mm256_shuffle_epi8(ef_fe_tbl, tmp2));
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range = _mm256_add_epi8(range, range2);
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/* Load min and max values per calculated range index */
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__m256i minv = _mm256_shuffle_epi8(range_min_tbl, range);
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__m256i maxv = _mm256_shuffle_epi8(range_max_tbl, range);
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/* Check value range */
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#if RET_ERR_IDX
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__m256i error = _mm256_cmpgt_epi8(minv, input);
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error = _mm256_or_si256(error, _mm256_cmpgt_epi8(input, maxv));
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/* 5% performance drop from this conditional branch */
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if (!_mm256_testz_si256(error, error))
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break;
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#else
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error1 = _mm256_or_si256(error1, _mm256_cmpgt_epi8(minv, input));
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error2 = _mm256_or_si256(error2, _mm256_cmpgt_epi8(input, maxv));
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#endif
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prev_input = input;
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prev_first_len = first_len;
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data += 32;
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len -= 32;
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#if RET_ERR_IDX
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err_pos += 32;
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#endif
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}
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#if RET_ERR_IDX
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/* Error in first 16 bytes */
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if (err_pos == 1)
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goto do_naive;
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#else
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__m256i error = _mm256_or_si256(error1, error2);
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if (!_mm256_testz_si256(error, error))
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return -1;
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#endif
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/* Find previous token (not 80~BF) */
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int32_t token4 = _mm256_extract_epi32(prev_input, 7);
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const int8_t *token = (const int8_t *)&token4;
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int lookahead = 0;
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if (token[3] > (int8_t)0xBF)
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lookahead = 1;
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else if (token[2] > (int8_t)0xBF)
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lookahead = 2;
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else if (token[1] > (int8_t)0xBF)
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lookahead = 3;
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data -= lookahead;
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len += lookahead;
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#if RET_ERR_IDX
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err_pos -= lookahead;
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#endif
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}
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/* Check remaining bytes with naive method */
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#if RET_ERR_IDX
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int err_pos2;
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do_naive:
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err_pos2 = utf8_naive(data, len);
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if (err_pos2)
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return err_pos + err_pos2 - 1;
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return 0;
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#else
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return utf8_naive(data, len);
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#endif
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}
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#endif
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